{"id":1841,"date":"2026-01-27T19:21:03","date_gmt":"2026-01-27T11:21:03","guid":{"rendered":"https:\/\/hueil.top\/?p=1841"},"modified":"2026-01-31T00:07:06","modified_gmt":"2026-01-30T16:07:06","slug":"java-%e6%96%b0%e6%89%8b%e5%bc%80%e8%8d%92%e8%ae%b0%ef%bc%9a%e6%88%91%e7%9a%84-7-%e5%a4%a9%e5%85%a5%e9%97%a8%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/hueil.top\/?p=1841","title":{"rendered":"Java \u65b0\u624b\u5f00\u8352\u8bb0\uff1a\u6211\u7684 7 \u5929\u5165\u95e8\u7b14\u8bb0"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Java_day01<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Java\u57fa\u7840<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Java\u7b80\u4ecb<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u662f\u7531 Sun Microsystems \u516c\u53f8\u4e8e 1995 \u5e74 5 \u6708\u63a8\u51fa\u7684 Java \u9762\u5411\u5bf9\u8c61\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u548c Java \u5e73\u53f0\u7684\u603b\u79f0\u3002\u7531 James Gosling\u548c\u540c\u4e8b\u4eec\u5171\u540c\u7814\u53d1\uff0c\u5e76\u5728 1995 \u5e74\u6b63\u5f0f\u63a8\u51fa\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u540e\u6765 Sun \u516c\u53f8\u88ab Oracle \uff08\u7532\u9aa8\u6587\uff09\u516c\u53f8\u6536\u8d2d\uff0cJava \u4e5f\u968f\u4e4b\u6210\u4e3a Oracle \u516c\u53f8\u7684\u4ea7\u54c1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Java\u5206\u4e3a\u4e09\u4e2a\u4f53\u7cfb\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>JavaSE\uff08J2SE\uff09\uff08Java2 Platform Standard Edition\uff0cjava\u5e73\u53f0\u6807\u51c6\u7248\uff09<\/li>\n\n\n\n<li>JavaEE(J2EE)(Java 2 Platform,Enterprise Edition\uff0cjava\u5e73\u53f0\u4f01\u4e1a\u7248)<\/li>\n\n\n\n<li>JavaME(J2ME)(Java 2 Platform Micro Edition\uff0cjava\u5e73\u53f0\u5fae\u578b\u7248)\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/www.runoob.com\/java\/java-intro.html\">\u4e3b\u8981\u7279\u6027<\/a><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Java \u8bed\u8a00\u662f\u7b80\u5355\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u9762\u5411\u5bf9\u8c61\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java\u8bed\u8a00\u662f\u5206\u5e03\u5f0f\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u5065\u58ee\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java\u8bed\u8a00\u662f\u5b89\u5168\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u4f53\u7cfb\u7ed3\u6784\u4e2d\u7acb\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u53ef\u79fb\u690d\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u89e3\u91ca\u578b\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u662f\u9ad8\u6027\u80fd\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u591a\u7ebf\u7a0b\u7684<\/strong><\/li>\n\n\n\n<li><strong>Java \u8bed\u8a00\u662f\u52a8\u6001\u7684<\/strong><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e0b\u8f7dJDK<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u94fe\u63a5<a href=\"https:\/\/www.oracle.com\/java\/technologies\/downloads\/#jdk25-windows\">Java Downloads | Oracle<\/a>\u4e0b\u8f7d<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-1024x564.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"564\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-1024x564.png\" alt=\"\" class=\"wp-image-1847\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-1024x564.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-300x165.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-768x423.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-1536x846.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-169-2048x1128.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u8f7d\u597d\u540e\uff0c\u6309\u7167\u63d0\u793a\u4e00\u6b65\u6b65\u5b89\u88c5<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-170.png'><img loading=\"lazy\" decoding=\"async\" width=\"775\" height=\"592\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-170.png\" alt=\"\" class=\"wp-image-1850\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-170.png 775w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-170-300x229.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-170-768x587.png 768w\" sizes=\"auto, (max-width: 775px) 100vw, 775px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9009\u62e9\u5b89\u88c5\u4f4d\u7f6e<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-171.png'><img loading=\"lazy\" decoding=\"async\" width=\"786\" height=\"599\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-171.png\" alt=\"\" class=\"wp-image-1851\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-171.png 786w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-171-300x229.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-171-768x585.png 768w\" sizes=\"auto, (max-width: 786px) 100vw, 786px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u95ed\u5373\u53ef<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-172.png'><img loading=\"lazy\" decoding=\"async\" width=\"781\" height=\"584\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-172.png\" alt=\"\" class=\"wp-image-1852\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-172.png 781w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-172-300x224.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-172-768x574.png 768w\" sizes=\"auto, (max-width: 781px) 100vw, 781px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9a8c\u8bc1\u5b89\u88c5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">win+R\u8f93\u5165cmd\u56de\u8f66\u6253\u5f00\u8fd0\u884c\u6846\u8f93\u5165: java &#8211;version , \u8fd4\u56de\u4e0b\u65b9\u7ed3\u679c\u5c31\u662f\u5b89\u88c5\u597d\u4e86<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-173-1024x351.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"351\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-173-1024x351.png\" alt=\"\" class=\"wp-image-1854\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-173-1024x351.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-173-300x103.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-173-768x263.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-173.png 1306w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b89\u88c5IDEA<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fdb\u5165\u5b98\u7f51<a href=\"https:\/\/www.jetbrains.com\/idea\/download\/?section=windows\">Download IntelliJ IDEA<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-1024x555.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"555\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-1024x555.png\" alt=\"\" class=\"wp-image-1858\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-1024x555.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-300x163.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-768x417.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-1536x833.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-174-2048x1111.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5355\u51fbDownload\u5f00\u59cb\u4e0b\u8f7dwindows\u7248\u672c\u7684IDEA<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-175.png'><img loading=\"lazy\" decoding=\"async\" width=\"749\" height=\"538\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-175.png\" alt=\"\" class=\"wp-image-1860\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-175.png 749w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-175-300x215.png 300w\" sizes=\"auto, (max-width: 749px) 100vw, 749px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9009\u62e9\u5b89\u88c5\u4f4d\u7f6e<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-176.png'><img loading=\"lazy\" decoding=\"async\" width=\"749\" height=\"537\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-176.png\" alt=\"\" class=\"wp-image-1862\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-176.png 749w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-176-300x215.png 300w\" sizes=\"auto, (max-width: 749px) 100vw, 749px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6309\u9700\u8981\u52fe\u9009<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-177.png'><img loading=\"lazy\" decoding=\"async\" width=\"736\" height=\"532\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-177.png\" alt=\"\" class=\"wp-image-1863\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-177.png 736w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-177-300x217.png 300w\" sizes=\"auto, (max-width: 736px) 100vw, 736px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5355\u51fb\u5b89\u88c5\u5373\u53ef<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-178.png'><img loading=\"lazy\" decoding=\"async\" width=\"747\" height=\"543\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-178.png\" alt=\"\" class=\"wp-image-1864\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-178.png 747w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-178-300x218.png 300w\" sizes=\"auto, (max-width: 747px) 100vw, 747px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b49\u5f85\u5b89\u88c5\u5b8c\u6210<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-179.png'><img loading=\"lazy\" decoding=\"async\" width=\"729\" height=\"533\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-179.png\" alt=\"\" class=\"wp-image-1865\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-179.png 729w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-179-300x219.png 300w\" sizes=\"auto, (max-width: 729px) 100vw, 729px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u521b\u5efa\u4e00\u4e2aJava\u9879\u76ee<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-1024x502.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"502\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-1024x502.png\" alt=\"\" class=\"wp-image-1868\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-1024x502.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-300x147.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-768x377.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-1536x753.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-180-2048x1005.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-1024x757.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"757\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-1024x757.png\" alt=\"\" class=\"wp-image-1869\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-1024x757.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-300x222.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-768x568.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-1536x1136.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-181-2048x1515.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9009\u597djdk\u540e\u521b\u5efa<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182-1024x729.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"729\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182-1024x729.png\" alt=\"\" class=\"wp-image-1870\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182-1024x729.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182-300x213.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182-768x546.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182-1536x1093.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-182.png 1823w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u6709\u793a\u8303\u4ee3\u7801\u7684java\u9879\u76ee<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-1024x604.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-1024x604.png\" alt=\"\" class=\"wp-image-1871\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-1024x604.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-300x177.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-768x453.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-1536x906.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-183-2048x1208.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Hello World\u7a0b\u5e8f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728src\u76ee\u5f55\u4e0b\u65b0\u5efa\u76ee\u5f55\uff0c\u521b\u5efa\u4e00\u4e2aJava\u7c7b<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184-1024x629.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"629\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184-1024x629.png\" alt=\"\" class=\"wp-image-1875\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184-1024x629.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184-300x184.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184-768x472.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184-1536x944.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-184.png 1756w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u5165\u7c7b\u540dHello<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-185.png'><img loading=\"lazy\" decoding=\"async\" width=\"662\" height=\"412\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-185.png\" alt=\"\" class=\"wp-image-1876\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-185.png 662w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-185-300x187.png 300w\" sizes=\"auto, (max-width: 662px) 100vw, 662px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u5165\u4e0b\u65b9\u4ee3\u7801<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package java_day01;\n\npublic class Hello {\n    public static void main(String&#91;] args){\n        System.out.println(\"Hello,Java\");\n    }\n}\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c\u8f93\u5165Hello , Java<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper' data-fancybox='post-images' href='https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186-1024x682.png'><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186-1024x682.png\" alt=\"\" class=\"wp-image-1879\" srcset=\"https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186-1024x682.png 1024w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186-300x200.png 300w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186-768x512.png 768w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186-1536x1023.png 1536w, https:\/\/hueil.top\/wp-content\/uploads\/2026\/01\/image-186.png 2044w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u57fa\u672c\u8bed\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f16\u5199 Java \u7a0b\u5e8f\u65f6\uff0c\u5e94\u6ce8\u610f\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5927\u5c0f\u5199\u654f\u611f<\/strong>\uff1aJava \u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u6807\u8bc6\u7b26 Hello \u4e0e hello \u662f\u4e0d\u540c\u7684\u3002<\/li>\n\n\n\n<li><strong>\u7c7b\u540d<\/strong>\uff1a\u5bf9\u4e8e\u6240\u6709\u7684\u7c7b\u6765\u8bf4\uff0c\u7c7b\u540d\u7684\u9996\u5b57\u6bcd\u5e94\u8be5\u5927\u5199\u3002\u5982\u679c\u7c7b\u540d\u7531\u82e5\u5e72\u5355\u8bcd\u7ec4\u6210\uff0c\u90a3\u4e48\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u5e94\u8be5\u5927\u5199\uff0c\u4f8b\u5982&nbsp;<strong>MyFirstJavaClass<\/strong>&nbsp;\u3002<\/li>\n\n\n\n<li><strong>\u65b9\u6cd5\u540d<\/strong>\uff1a\u6240\u6709\u7684\u65b9\u6cd5\u540d\u90fd\u5e94\u8be5\u4ee5\u5c0f\u5199\u5b57\u6bcd\u5f00\u5934\u3002\u5982\u679c\u65b9\u6cd5\u540d\u542b\u6709\u82e5\u5e72\u5355\u8bcd\uff0c\u5219\u540e\u9762\u7684\u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199\u3002<\/li>\n\n\n\n<li><strong>\u6e90\u6587\u4ef6\u540d<\/strong>\uff1a\u6e90\u6587\u4ef6\u540d\u5fc5\u987b\u548c\u7c7b\u540d\u76f8\u540c\u3002\u5f53\u4fdd\u5b58\u6587\u4ef6\u7684\u65f6\u5019\uff0c\u4f60\u5e94\u8be5\u4f7f\u7528\u7c7b\u540d\u4f5c\u4e3a\u6587\u4ef6\u540d\u4fdd\u5b58\uff08\u5207\u8bb0 Java \u662f\u5927\u5c0f\u5199\u654f\u611f\u7684\uff09\uff0c\u6587\u4ef6\u540d\u7684\u540e\u7f00\u4e3a&nbsp;<strong>.java<\/strong>\u3002\uff08\u5982\u679c\u6587\u4ef6\u540d\u548c\u7c7b\u540d\u4e0d\u76f8\u540c\u5219\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u9519\u8bef\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e3b\u65b9\u6cd5\u5165\u53e3<\/strong>\uff1a\u6240\u6709\u7684 Java \u7a0b\u5e8f\u7531&nbsp;<strong>public static void main(String[] args)<\/strong>&nbsp;\u65b9\u6cd5\u5f00\u59cb\u6267\u884c\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Java \u6807\u8bc6\u7b26<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java \u6240\u6709\u7684\u7ec4\u6210\u90e8\u5206\u90fd\u9700\u8981\u540d\u5b57\u3002\u7c7b\u540d\u3001\u53d8\u91cf\u540d\u4ee5\u53ca\u65b9\u6cd5\u540d\u90fd\u88ab\u79f0\u4e3a\u6807\u8bc6\u7b26\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u4e8e Java \u6807\u8bc6\u7b26\uff0c\u6709\u4ee5\u4e0b\u51e0\u70b9\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6240\u6709\u7684\u6807\u8bc6\u7b26\u90fd\u5e94\u8be5\u4ee5\u5b57\u6bcd\uff08A-Z \u6216\u8005 a-z\uff09,\u7f8e\u5143\u7b26\uff08$\uff09\u3001\u6216\u8005\u4e0b\u5212\u7ebf\uff08_\uff09\u5f00\u59cb<\/li>\n\n\n\n<li>\u9996\u5b57\u7b26\u4e4b\u540e\u53ef\u4ee5\u662f\u5b57\u6bcd\uff08A-Z \u6216\u8005 a-z\uff09,\u7f8e\u5143\u7b26\uff08$\uff09\u3001\u4e0b\u5212\u7ebf\uff08_\uff09\u6216\u6570\u5b57\u7684\u4efb\u4f55\u5b57\u7b26\u7ec4\u5408<\/li>\n\n\n\n<li>\u5173\u952e\u5b57\u4e0d\u80fd\u7528\u4f5c\u6807\u8bc6\u7b26<\/li>\n\n\n\n<li>\u6807\u8bc6\u7b26\u662f\u5927\u5c0f\u5199\u654f\u611f\u7684<\/li>\n\n\n\n<li>\u5408\u6cd5\u6807\u8bc6\u7b26\u4e3e\u4f8b\uff1aage\u3001$salary\u3001_value\u3001__1_value<\/li>\n\n\n\n<li>\u975e\u6cd5\u6807\u8bc6\u7b26\u4e3e\u4f8b\uff1a123abc\u3001-salary<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u679a\u4e3e\u7c7b\u578b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java 5.0\u5f15\u5165\u4e86\u679a\u4e3e\uff0c\u679a\u4e3e\u9650\u5236\u53d8\u91cf\u53ea\u80fd\u662f\u9884\u5148\u8bbe\u5b9a\u597d\u7684\u503c\u3002\u4f7f\u7528\u679a\u4e3e\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u4e2d\u7684 bug\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package java_day01;\n\nclass FreshJuice {\n    enum FreshJuiceSize{ SMALL, MEDIUM , LARGE }\n    FreshJuiceSize size;\n}\n\npublic class Enum {\n    public static void main(String&#91;] args){\n        FreshJuice juice = new FreshJuice();\n        juice.size = FreshJuice.FreshJuiceSize.MEDIUM ;\n        System.out.println(juice.size);\n    }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u5173\u952e\u5b57<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">abstract<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">java\u8bed\u8a00\u5e38\u7528\u5173\u952e\u5b57\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>abstract \u7528\u4e8e\u58f0\u660e\u4e00\u4e2a<strong>\u62bd\u8c61\u7c7b<\/strong>\u6216<strong>\u62bd\u8c61\u65b9\u6cd5<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u7c7b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u7c7b\u4f7f\u7528&nbsp;<em>abstract<\/em>&nbsp;\u5173\u952e\u5b57\u58f0\u660e\u3002\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u666e\u901a\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\uff0c\u4e5f\u53ef\u4ee5\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u3002\u62bd\u8c61\u65b9\u6cd5\u662f\u6ca1\u6709\u5177\u4f53\u5b9e\u73b0\u7684\u65b9\u6cd5\uff0c\u5b83\u53ea\u6709\u65b9\u6cd5\u540d\uff0c\u6ca1\u6709\u65b9\u6cd5\u4f53\u3002\u62bd\u8c61\u7c7b\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public abstract class MyClass {\n   \/\/ \u62bd\u8c61\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u7c7b\u7684\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public abstract class Shape {\n   protected int x;\n   protected int y;\n   public Shape(int x, int y) {\n       this.x = x;\n       this.y = y;\n   }\n   public abstract double getArea();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<em>Shape<\/em>&nbsp;\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u5b83\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5&nbsp;<em>getArea()<\/em>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u65b9\u6cd5\u4f7f\u7528&nbsp;<em>abstract<\/em>&nbsp;\u5173\u952e\u5b57\u58f0\u660e\uff0c\u6ca1\u6709\u65b9\u6cd5\u4f53\uff0c\u53ea\u6709\u65b9\u6cd5\u7684\u58f0\u660e\u3002\u62bd\u8c61\u65b9\u6cd5\u5fc5\u987b\u5728\u5b50\u7c7b\u4e2d\u88ab\u5b9e\u73b0\uff0c\u5426\u5219\u5b50\u7c7b\u4e5f\u5fc5\u987b\u88ab\u58f0\u660e\u4e3a\u62bd\u8c61\u7c7b\u3002\u62bd\u8c61\u65b9\u6cd5\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public abstract void myMethod();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u62bd\u8c61\u65b9\u6cd5\u7684\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public abstract class Shape {\n   public abstract double getArea();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b50\u7c7b\u5b9e\u73b0\u62bd\u8c61\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b50\u7c7b\u7ee7\u627f\u62bd\u8c61\u7c7b\u65f6\uff0c\u5fc5\u987b\u5b9e\u73b0\u62bd\u8c61\u7c7b\u4e2d\u7684\u6240\u6709\u62bd\u8c61\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Circle extends Shape {\n   private int radius;\n   public Circle(int x, int y, int radius) {\n       super(x, y);\n       this.radius = radius;\n   }\n   @Override\n   public double getArea() {\n       return Math.PI * radius * radius;\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<em>Circle<\/em>&nbsp;\u7c7b\u7ee7\u627f\u4e86&nbsp;<em>Shape<\/em>&nbsp;\u7c7b\uff0c\u5e76\u5b9e\u73b0\u4e86&nbsp;<em>getArea()<\/em>&nbsp;\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u62bd\u8c61\u7c7b\u548c\u62bd\u8c61\u65b9\u6cd5\u7684\u597d\u5904<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u62bd\u8c61\u7c7b\u548c\u62bd\u8c61\u65b9\u6cd5\u53ef\u4ee5\u8ba9\u6211\u4eec\u66f4\u597d\u5730\u7ec4\u7ec7\u4ee3\u7801\uff0c\u5b9e\u73b0\u591a\u6001\u548c\u4ee3\u7801\u590d\u7528\uff0c\u540c\u65f6\u4e5f\u53ef\u4ee5\u5728\u8bbe\u8ba1\u4e0a\u4fdd\u8bc1\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e8b\u9879<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u62bd\u8c61\u7c7b\u4e0d\u80fd\u88ab\u5b9e\u4f8b\u5316\u3002<\/li>\n\n\n\n<li>\u62bd\u8c61\u7c7b\u53ef\u4ee5\u5305\u542b\u6784\u9020\u65b9\u6cd5\u3002<\/li>\n\n\n\n<li>\u62bd\u8c61\u7c7b\u4e2d\u4e0d\u4e00\u5b9a\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\uff0c\u4f46\u5305\u542b\u62bd\u8c61\u65b9\u6cd5\u7684\u7c7b\u4e00\u5b9a\u662f\u62bd\u8c61\u7c7b\u3002<\/li>\n\n\n\n<li>\u62bd\u8c61\u65b9\u6cd5\u4e0d\u80fd\u6709\u65b9\u6cd5\u4f53\uff0c\u5fc5\u987b\u5728\u5b50\u7c7b\u4e2d\u5b9e\u73b0\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u7406\u89e3\u548c\u4f7f\u7528&nbsp;<em>abstract<\/em>&nbsp;\u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u8bbe\u8ba1\u548c\u5b9e\u73b0\u9762\u5411\u5bf9\u8c61\u7684\u7a0b\u5e8f\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u7075\u6d3b\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">native<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728Java\u7f16\u7a0b\u4e2d\uff0c<strong>native\u5173\u952e\u5b57<\/strong>\u7528\u4e8e\u58f0\u660e\u4e00\u4e2a\u65b9\u6cd5\u662f\u7531\u672c\u5730\u4ee3\u7801\uff08\u901a\u5e38\u662fC\u6216C++\uff09\u5b9e\u73b0\u7684\u3002\u8fd9\u610f\u5473\u7740\u8be5\u65b9\u6cd5\u7684\u5177\u4f53\u5b9e\u73b0\u4e0d\u662f\u7528Java\u7f16\u5199\u7684\uff0c\u800c\u662f\u7531\u5e95\u5c42\u7684\u672c\u5730\u4ee3\u7801\u63d0\u4f9b\u3002\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8Java\u7a0b\u5e8f\u4e0e\u672c\u5730\u4ee3\u7801\u8fdb\u884c\u4ea4\u4e92\uff0c\u5b9e\u73b0\u66f4\u9ad8\u6548\u7684\u64cd\u4f5c\uff0c\u6216\u8005\u8bbf\u95ee\u5e95\u5c42\u7cfb\u7edf\u8d44\u6e90\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8981\u58f0\u660e\u4e00\u4e2anative\u65b9\u6cd5\uff0c\u53ea\u9700\u5728Java\u65b9\u6cd5\u7684\u58f0\u660e\u4e2d\u52a0\u4e0a<strong>native\u5173\u952e\u5b57<\/strong>\uff0c\u5e76\u4e14\u4e0d\u9700\u8981\u63d0\u4f9b\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public native void nativeMethod();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<em>nativeMethod()<\/em>\u662f\u4e00\u4e2anative\u65b9\u6cd5\uff0c\u5b83\u7684\u5177\u4f53\u5b9e\u73b0\u5c06\u5728\u672c\u5730\u4ee3\u7801\u4e2d\u63d0\u4f9b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u4f7f\u7528native\u65b9\u6cd5\uff0c\u5fc5\u987b\u5728Java\u7a0b\u5e8f\u4e2d\u52a0\u8f7d\u672c\u5730\u5e93\uff0c\u5e76\u786e\u4fdd\u672c\u5730\u5e93\u4e2d\u5305\u542b\u4e86\u6240\u9700\u7684\u51fd\u6570\u3002\u672c\u5730\u5e93\u53ef\u4ee5\u4f7f\u7528Java\u7684JNI\uff08Java Native Interface\uff09\u6765\u7f16\u5199\uff0c\u5e76\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u901a\u8fc7<em>System.loadLibrary()<\/em>\u65b9\u6cd5\u52a0\u8f7d\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class NativeExample {\n   static {\n       System.loadLibrary(\"nativeLibrary\");\n   }\n   public native void nativeMethod();\n   public static void main(String&#91;] args) {\n       new NativeExample().nativeMethod();\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<em>nativeMethod()<\/em>\u5c06\u5728\u540d\u4e3a<em>nativeLibrary<\/em>\u7684\u672c\u5730\u5e93\u4e2d\u5b9e\u73b0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9e\u73b0\u6b65\u9aa4<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u521b\u5efa\u5305\u542b\u672c\u5730\u65b9\u6cd5\u7684\u7c7b<\/strong>\uff1a\u7f16\u5199\u4e00\u4e2a\u5305\u542bnative\u65b9\u6cd5\u7684Java\u7c7b\u3002<\/li>\n\n\n\n<li><strong>\u7f16\u8bd1\u8fd0\u884c<\/strong>\uff1a\u4f7f\u7528<em>javac<\/em>\u7f16\u8bd1Java\u7c7b\u3002<\/li>\n\n\n\n<li><strong>\u83b7\u5f97\u5934\u6587\u4ef6<\/strong>\uff1a\u4f7f\u7528<em>javah<\/em>\u751f\u6210\u5305\u542b\u672c\u5730\u65b9\u6cd5\u58f0\u660e\u7684\u5934\u6587\u4ef6\u3002<\/li>\n\n\n\n<li><strong>\u5b9e\u73b0\u5934\u6587\u4ef6\u7684\u58f0\u660e\u65b9\u6cd5<\/strong>\uff1a\u5728C\u6216C++\u4e2d\u5b9e\u73b0\u5934\u6587\u4ef6\u4e2d\u58f0\u660e\u7684\u65b9\u6cd5\u3002<\/li>\n\n\n\n<li><strong>\u751f\u6210\u52a8\u6001\u94fe\u63a5\u5e93<\/strong>\uff1a\u5c06C\u6216C++\u6587\u4ef6\u7f16\u8bd1\u4e3a\u52a8\u6001\u94fe\u63a5\u5e93\uff08\u5982DLL\u6587\u4ef6\uff09\u3002<\/li>\n\n\n\n<li><strong>\u518d\u6b21\u8fd0\u884cJava\u7c7b<\/strong>\uff1a\u4f7f\u7528<em>System.loadLibrary()<\/em>\u52a0\u8f7d\u52a8\u6001\u94fe\u63a5\u5e93\uff0c\u5e76\u8fd0\u884cJava\u7c7b\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e8b\u9879<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528native\u65b9\u6cd5\u867d\u7136\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6027\u80fd\uff0c\u4f46\u4e5f\u5e26\u6765\u4e86\u6f5c\u5728\u7684\u5b89\u5168\u9690\u60a3\u548c\u8de8\u5e73\u53f0\u517c\u5bb9\u6027\u95ee\u9898\u3002\u56e0\u6b64\uff0c\u9664\u975e\u5fc5\u8981\uff0c\u5426\u5219\u5e94\u5c3d\u91cf\u907f\u514d\u4f7f\u7528native\u65b9\u6cd5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">throw<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Java \u4e2d\uff0c<strong>throw<\/strong>&nbsp;\u5173\u952e\u5b57\u7528\u4e8e\u663e\u5f0f\u5730\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u3002\u901a\u8fc7\u4f7f\u7528 throw \u8bed\u53e5\uff0c\u7a0b\u5e8f\u5458\u53ef\u4ee5\u5728\u4ee3\u7801\u4e2d\u624b\u52a8\u5f15\u53d1\u5f02\u5e38\uff0c\u4ece\u800c\u4e2d\u6b62\u5f53\u524d\u7684\u6267\u884c\u6d41\uff0c\u5e76\u5c06\u63a7\u5236\u6743\u4ea4\u7ed9\u76f8\u5e94\u7684 catch \u5757\u6765\u5904\u7406\u8be5\u5f02\u5e38\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">throw \u8bed\u53e5\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>throw new ExceptionInstance;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2d\uff0c<strong>ExceptionInstance<\/strong>&nbsp;\u662f\u4e00\u4e2a\u5f02\u5e38\u7c7b\u7684\u5b9e\u4f8b\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cthrow \u8bed\u53e5\u6bcf\u6b21\u53ea\u80fd\u629b\u51fa\u4e00\u4e2a\u5f02\u5e38\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528 throw \u8bed\u53e5\u629b\u51fa\u5f02\u5e38\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Main {\n   public static void divideByZero() {\n       throw new ArithmeticException(\"\u8bd5\u56fe\u9664\u4ee50\");\n   }\n   public static void main(String&#91;] args) {\n       divideByZero();\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Exception in thread \"main\" java.lang.ArithmeticException: \u8bd5\u56fe\u9664\u4ee50\n   at Main.divideByZero(Main.java:3)\n   at Main.main(Main.java:7)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u663e\u5f0f\u5730\u629b\u51fa\u4e86\u4e00\u4e2a&nbsp;<strong>ArithmeticException<\/strong>&nbsp;\u5f02\u5e38\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u629b\u51fa\u68c0\u67e5\u5f02\u5e38<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u68c0\u67e5\u5f02\u5e38\uff08Checked Exception\uff09\uff0c\u5fc5\u987b\u5728\u65b9\u6cd5\u58f0\u660e\u4e2d\u4f7f\u7528&nbsp;<strong>throws<\/strong>&nbsp;\u5173\u952e\u5b57\u6765\u58f0\u660e\u8be5\u65b9\u6cd5\u53ef\u80fd\u629b\u51fa\u7684\u5f02\u5e38\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\nclass Main {\n   public static void findFile() throws IOException {\n       throw new IOException(\"\u6587\u4ef6\u672a\u627e\u5230\");\n   }\n   public static void main(String&#91;] args) {\n       try {\n           findFile();\n       } catch (IOException e) {\n           System.out.println(e.getMessage());\n       }\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6587\u4ef6\u672a\u627e\u5230<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<strong>findFile()<\/strong>&nbsp;\u65b9\u6cd5\u4f7f\u7528\u4f20\u9012\u7ed9\u5176\u6784\u9020\u51fd\u6570\u7684\u6d88\u606f\u629b\u51fa\u4e86\u4e00\u4e2a&nbsp;<strong>IOException<\/strong>\u3002\u7531\u4e8e\u5b83\u662f\u4e00\u4e2a\u68c0\u67e5\u5f02\u5e38\uff0c\u56e0\u6b64\u5fc5\u987b\u5728&nbsp;<strong>throws<\/strong>&nbsp;\u5b50\u53e5\u4e2d\u6307\u5b9a\u5b83\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\u53ef\u4ee5\u5e2e\u52a9\u66f4\u597d\u5730\u63cf\u8ff0\u548c\u5904\u7406\u7279\u5b9a\u7684\u5f02\u5e38\u60c5\u51b5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class AuctionException extends Exception {\n   public AuctionException(String message) {\n       super(message);\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u521b\u5efa\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\uff0c\u53ef\u4ee5\u5728\u4ee3\u7801\u4e2d\u66f4\u51c6\u786e\u5730\u63cf\u8ff0\u5f02\u5e38\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u603b\u7ed3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u4f7f\u7528&nbsp;<strong>throw<\/strong>&nbsp;\u5173\u952e\u5b57\uff0cJava \u7a0b\u5e8f\u5458\u53ef\u4ee5\u663e\u5f0f\u5730\u629b\u51fa\u5f02\u5e38\uff0c\u4ece\u800c\u4e2d\u6b62\u5f53\u524d\u7684\u6267\u884c\u6d41\uff0c\u5e76\u5c06\u63a7\u5236\u6743\u4ea4\u7ed9\u76f8\u5e94\u7684&nbsp;<strong>catch<\/strong>&nbsp;\u5757\u6765\u5904\u7406\u8be5\u5f02\u5e38\u3002\u5bf9\u4e8e\u68c0\u67e5\u5f02\u5e38\uff0c\u5fc5\u987b\u5728\u65b9\u6cd5\u58f0\u660e\u4e2d\u4f7f\u7528&nbsp;<strong>throws<\/strong>&nbsp;\u5173\u952e\u5b57\u6765\u58f0\u660e\u8be5\u65b9\u6cd5\u53ef\u80fd\u629b\u51fa\u7684\u5f02\u5e38\u7c7b\u578b\u3002\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\u53ef\u4ee5\u5e2e\u52a9\u66f4\u597d\u5730\u63cf\u8ff0\u548c\u5904\u7406\u7279\u5b9a\u7684\u5f02\u5e38\u60c5\u51b5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">strictfp<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728Java\u4e2d\uff0c<strong>strictfp<\/strong>\u5173\u952e\u5b57\u7528\u4e8e\u786e\u4fdd\u6d6e\u70b9\u8ba1\u7b97\u7684\u7ed3\u679c\u5728\u4e0d\u540c\u7684\u5904\u7406\u5668\u5e73\u53f0\u4e0a\u4fdd\u6301\u4e00\u81f4\u3002\u7531\u4e8e\u4e0d\u540c\u5904\u7406\u5668\u53ef\u80fd\u4f7f\u7528\u4e0d\u540c\u7684\u6d6e\u70b9\u5bc4\u5b58\u5668\uff08\u4f8b\u598280\u4f4d\u548c64\u4f4d\uff09\uff0c\u8fd9\u53ef\u80fd\u5bfc\u81f4\u6d6e\u70b9\u8ba1\u7b97\u7ed3\u679c\u7684\u4e0d\u4e00\u81f4\u3002\u4f7f\u7528strictfp\u5173\u952e\u5b57\u53ef\u4ee5\u5f3a\u5236Java\u865a\u62df\u673a\u6309\u7167IEEE 754\u6d6e\u70b9\u6807\u51c6\u8fdb\u884c\u8ba1\u7b97\uff0c\u4ece\u800c\u4fdd\u8bc1\u7ed3\u679c\u7684\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u793a\u4f8b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528strictfp\u5173\u952e\u5b57\u4fee\u9970\u65b9\u6cd5\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class StrictfpTest {\n   public static strictfp void main(String&#91;] args) {\n       float aFloat = 0.6710339f;\n       double aDouble = 0.04150553411984792d;\n       double sum = aFloat + aDouble;\n       float quotient = (float)(aFloat \/ aDouble);\n       System.out.println(\"float: \" + aFloat);\n       System.out.println(\"double: \" + aDouble);\n       System.out.println(\"sum: \" + sum);\n       System.out.println(\"quotient: \" + quotient);\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cmain\u65b9\u6cd5\u4e2d\u7684\u6240\u6709\u6307\u4ee4\u90fd\u5c06\u4f7f\u7528\u4e25\u683c\u7684\u6d6e\u70b9\u8ba1\u7b97\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9002\u7528\u8303\u56f4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">strictfp\u5173\u952e\u5b57\u53ef\u4ee5\u7528\u6765\u4fee\u9970\u7c7b\u3001\u63a5\u53e3\u6216\u65b9\u6cd5\u3002\u4f7f\u7528strictfp\u5173\u952e\u5b57\u6807\u8bb0\u7684\u65b9\u6cd5\u5fc5\u987b\u4f7f\u7528\u4e25\u683c\u7684\u6d6e\u70b9\u8ba1\u7b97\u6765\u751f\u6210\u53ef\u518d\u751f\u7684\u7ed3\u679c\u3002\u4e25\u683c\u7684\u6d6e\u70b9\u8ba1\u7b97\u8868\u793a\u6d6e\u70b9\u8ba1\u7b97\u5b8c\u5168\u4f9d\u7167\u6d6e\u70b9\u89c4\u8303IEEE 754\u6765\u6267\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6027\u80fd\u5f71\u54cd<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u91c7\u7528strictfp\u5173\u952e\u5b57\u4f1a\u5bf9\u4e2d\u95f4\u7ed3\u679c\u8fdb\u884c\u622a\u65ad\u64cd\u4f5c\uff0c\u800c\u622a\u65ad\u64cd\u4f5c\u9700\u8981\u6d88\u8017\u65f6\u95f4\uff0c\u56e0\u6b64\u5728\u8ba1\u7b97\u901f\u5ea6\u4e0a\u6bd4\u4e0d\u4f7f\u7528strictfp\u8981\u6162\u3002\u7136\u800c\uff0c\u5bf9\u4e8e\u5927\u591a\u6570\u7a0b\u5e8f\u6765\u8bf4\uff0c\u6d6e\u70b9\u6ea2\u51fa\u5e76\u4e0d\u662f\u4e00\u4e2a\u5927\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u8bba<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c3d\u7ba1strictfp\u5173\u952e\u5b57\u5728Java 17\u4e2d\u5df2\u7ecf\u53d8\u5f97\u4e0d\u518d\u5fc5\u8981\uff0c\u4f46\u5b83\u5728\u786e\u4fdd\u6d6e\u70b9\u8ba1\u7b97\u7ed3\u679c\u4e00\u81f4\u6027\u65b9\u9762\u4ecd\u7136\u5177\u6709\u91cd\u8981\u610f\u4e49\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">transient<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>transient<\/strong>&nbsp;\u662f Java \u4e2d\u7528\u4e8e\u63a7\u5236\u5e8f\u5217\u5316\u884c\u4e3a\u7684\u5173\u952e\u5b57\u3002\u5b83\u7684\u4e3b\u8981\u4f5c\u7528\u662f<strong>\u963b\u6b62\u67d0\u4e2a\u5b9e\u4f8b\u53d8\u91cf\u88ab\u5e8f\u5217\u5316<\/strong>\uff0c\u5373\u5728\u5bf9\u8c61\u6301\u4e45\u5316\u65f6\uff0c\u8be5\u5b57\u6bb5\u4e0d\u4f1a\u88ab\u5199\u5165\u5230\u5e8f\u5217\u5316\u6d41\u4e2d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4e00\u4e2a\u7c7b\u5b9e\u73b0\u4e86&nbsp;<strong>Serializable<\/strong>&nbsp;\u63a5\u53e3\u65f6\uff0c\u9ed8\u8ba4\u6240\u6709\u975e\u9759\u6001\u6210\u5458\u53d8\u91cf\u90fd\u4f1a\u88ab\u5e8f\u5217\u5316\u3002\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6709\u4e9b\u5b57\u6bb5\uff08\u5982\u5bc6\u7801\u3001\u94f6\u884c\u5361\u53f7\u7b49\u654f\u611f\u4fe1\u606f\uff09\u4e0d\u5e0c\u671b\u88ab\u6301\u4e45\u5316\u6216\u901a\u8fc7\u7f51\u7edc\u4f20\u8f93\uff0c\u8fd9\u65f6\u5c31\u53ef\u4ee5\u7528&nbsp;<em>transient<\/em>&nbsp;\u4fee\u9970\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u57fa\u672c\u7528\u6cd5\u793a\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.io.*;\nclass User implements Serializable {\n   private static final long serialVersionUID = 1L;\n   private String username;\n   private transient String password; \/\/ \u4e0d\u4f1a\u88ab\u5e8f\u5217\u5316\n   public User(String username, String password) {\n       this.username = username;\n       this.password = password;\n   }\n   public String toString() {\n       return \"username: \" + username + \", password: \" + password;\n   }\n}\npublic class TransientDemo {\n   public static void main(String&#91;] args) throws Exception {\n       User user = new User(\"Alexia\", \"123456\");\n       \/\/ \u5e8f\u5217\u5316\n       ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(\"user.obj\"));\n       oos.writeObject(user);\n       oos.close();\n       \/\/ \u53cd\u5e8f\u5217\u5316\n       ObjectInputStream ois = new ObjectInputStream(new FileInputStream(\"user.obj\"));\n       User deserialized = (User) ois.readObject();\n       ois.close();\n       System.out.println(deserialized);\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\u7ed3\u679c\u4e2d&nbsp;<em>password<\/em>&nbsp;\u4f1a\u53d8\u4e3a&nbsp;<strong>null<\/strong>\uff0c\u8bf4\u660e\u5b83\u672a\u88ab\u5e8f\u5217\u5316\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4ec5\u4f5c\u7528\u4e8e\u53d8\u91cf<\/strong>\uff1a\u4e0d\u80fd\u4fee\u9970\u65b9\u6cd5\u3001\u7c7b\uff0c\u672c\u5730\u53d8\u91cf\u4e5f\u4e0d\u80fd\u7528&nbsp;<em>transient<\/em>\u3002<\/li>\n\n\n\n<li><strong>\u9759\u6001\u53d8\u91cf\u4e0d\u53d7\u5f71\u54cd<\/strong>\uff1a\u9759\u6001\u5b57\u6bb5\u672c\u8eab\u4e0d\u53c2\u4e0e\u5e8f\u5217\u5316\uff0c\u4e0e\u662f\u5426\u52a0&nbsp;<em>transient<\/em>&nbsp;\u65e0\u5173\u3002\u53cd\u5e8f\u5217\u5316\u540e\u9759\u6001\u53d8\u91cf\u503c\u6765\u81ea\u5f53\u524d JVM\uff0c\u800c\u975e\u5e8f\u5217\u5316\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>Externalizable \u7279\u4f8b<\/strong>\uff1a\u5982\u679c\u7c7b\u5b9e\u73b0\u7684\u662f&nbsp;<strong>Externalizable<\/strong>&nbsp;\u63a5\u53e3\uff0c\u5e76\u5728&nbsp;<em>writeExternal<\/em>&nbsp;\u65b9\u6cd5\u4e2d\u624b\u52a8\u5e8f\u5217\u5316&nbsp;<em>transient<\/em>&nbsp;\u5b57\u6bb5\uff0c\u8be5\u5b57\u6bb5\u4f9d\u7136\u4f1a\u88ab\u5199\u5165\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9002\u7528\u573a\u666f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5c4f\u853d\u654f\u611f\u4fe1\u606f\uff08\u5bc6\u7801\u3001\u5bc6\u94a5\u7b49\uff09<\/li>\n\n\n\n<li>\u907f\u514d\u5e8f\u5217\u5316\u65e0\u610f\u4e49\u6216\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\u5bf9\u8c61\uff08\u5982\u7ebf\u7a0b\u3001Socket \u7b49\uff09<\/li>\n\n\n\n<li>\u51cf\u5c11\u5e8f\u5217\u5316\u6570\u636e\u4f53\u79ef\uff0c\u63d0\u9ad8\u4f20\u8f93\u6548\u7387<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u6837\uff0c<em>transient<\/em>&nbsp;\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5728\u5e8f\u5217\u5316\u8fc7\u7a0b\u4e2d\u66f4\u597d\u5730\u63a7\u5236\u6570\u636e\u5b89\u5168\u4e0e\u6027\u80fd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">protected<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Java \u4e2d\uff0c<em>protected<\/em>&nbsp;\u662f\u4e00\u79cd\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u7528\u4e8e\u63a7\u5236\u7c7b\u6210\u5458\uff08\u5b57\u6bb5\u3001\u65b9\u6cd5\u3001\u6784\u9020\u51fd\u6570\uff09\u7684\u53ef\u89c1\u6027\u3002\u5b83\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u5141\u8bb8\u5b50\u7c7b\u548c\u540c\u4e00\u5305\u5185\u7684\u7c7b\u8bbf\u95ee\u88ab\u4fee\u9970\u7684\u6210\u5458\uff0c\u4f46\u5728\u4e0d\u540c\u5305\u7684\u975e\u5b50\u7c7b\u4e2d\u4e0d\u53ef\u89c1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">protected \u7684\u53ef\u89c1\u6027\u89c4\u5219<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u540c\u4e00\u5305\u5185<\/strong>\uff1a<em>protected<\/em>&nbsp;\u4fee\u9970\u7684\u6210\u5458\u5bf9\u540c\u4e00\u5305\u5185\u7684\u6240\u6709\u7c7b\u53ef\u89c1\u3002<\/li>\n\n\n\n<li><strong>\u5b50\u7c7b\u8bbf\u95ee<\/strong>\uff1a\u5373\u4f7f\u5b50\u7c7b\u4e0e\u7236\u7c7b\u4e0d\u5728\u540c\u4e00\u5305\u4e2d\uff0c\u5b50\u7c7b\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u4ece\u7236\u7c7b\u7ee7\u627f\u7684&nbsp;<em>protected<\/em>&nbsp;\u6210\u5458\uff0c\u4f46\u53ea\u80fd\u901a\u8fc7\u5b50\u7c7b\u81ea\u8eab\u7684\u5b9e\u4f8b\u8bbf\u95ee\uff0c\u800c\u4e0d\u80fd\u901a\u8fc7\u7236\u7c7b\u5b9e\u4f8b\u6216\u5176\u4ed6\u5b50\u7c7b\u5b9e\u4f8b\u8bbf\u95ee\u3002<\/li>\n\n\n\n<li><strong>\u8de8\u5305\u9650\u5236<\/strong>\uff1a\u5982\u679c\u7236\u7c7b\u548c\u5b50\u7c7b\u4e0d\u5728\u540c\u4e00\u5305\u4e2d\uff0c\u7236\u7c7b\u65e0\u6cd5\u8bbf\u95ee\u5b50\u7c7b\u4e2d\u7279\u6709\u7684&nbsp;<em>protected<\/em>&nbsp;\u6210\u5458\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u4f8b\u4ee3\u7801<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f\u4e00\u4e2a\u5173\u4e8e&nbsp;<em>protected<\/em>&nbsp;\u7684\u7b80\u5355\u793a\u4f8b\uff0c\u5c55\u793a\u5176\u5728\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u884c\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u7236\u7c7b\u5728\u5305 A \u4e2d\npackage A;\npublic class Parent {\n   protected void display() {\n       System.out.println(\"Protected method in Parent class\");\n   }\n}\n\/\/ \u5b50\u7c7b\u5728\u5305 B \u4e2d\npackage B;\nimport A.Parent;\npublic class Child extends Parent {\n   public void callDisplay() {\n       \/\/ \u5b50\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u7ee7\u627f\u7684 protected \u65b9\u6cd5\n       display();\n   }\n}\n\/\/ \u6d4b\u8bd5\u7c7b\u5728\u5305 B \u4e2d\npackage B;\npublic class Test {\n   public static void main(String&#91;] args) {\n       Child child = new Child();\n       child.callDisplay(); \/\/ \u8f93\u51fa: Protected method in Parent class\n       Parent parent = new Parent();\n       \/\/ parent.display(); \/\/ \u7f16\u8bd1\u9519\u8bef\uff1a\u65e0\u6cd5\u901a\u8fc7\u7236\u7c7b\u5b9e\u4f8b\u8bbf\u95ee protected \u65b9\u6cd5\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e8b\u9879<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8de8\u5305\u8bbf\u95ee\u9650\u5236<\/strong>\uff1a\u5982\u679c\u5b50\u7c7b\u548c\u7236\u7c7b\u4e0d\u5728\u540c\u4e00\u5305\u4e2d\uff0c\u5b50\u7c7b\u53ea\u80fd\u901a\u8fc7\u81ea\u8eab\u5b9e\u4f8b\u8bbf\u95ee\u7ee7\u627f\u7684&nbsp;<em>protected<\/em>&nbsp;\u6210\u5458\uff0c\u4e0d\u80fd\u901a\u8fc7\u7236\u7c7b\u5b9e\u4f8b\u6216\u5176\u4ed6\u5b50\u7c7b\u5b9e\u4f8b\u8bbf\u95ee\u3002<\/li>\n\n\n\n<li><strong>\u6784\u9020\u51fd\u6570\u7684&nbsp;<em>protected<\/em>&nbsp;\u4fee\u9970<\/strong>\uff1a<em>protected<\/em>&nbsp;\u6784\u9020\u51fd\u6570\u5141\u8bb8\u5b50\u7c7b\u8c03\u7528\uff0c\u4f46\u9650\u5236\u4e86\u975e\u5b50\u7c7b\u76f4\u63a5\u5b9e\u4f8b\u5316\u7236\u7c7b\u3002<\/li>\n\n\n\n<li><strong>\u5185\u90e8\u7c7b\u7684&nbsp;<em>protected<\/em>&nbsp;\u4fee\u9970<\/strong>\uff1a<em>protected<\/em>&nbsp;\u7684\u5185\u90e8\u7c7b\u53ea\u80fd\u5728\u540c\u4e00\u5305\u5185\u6216\u5b50\u7c7b\u4e2d\u88ab\u8bbf\u95ee\uff0c\u4f46\u5176\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u7684\u53ef\u89c1\u6027\u4e5f\u4f1a\u53d7\u5230\u9650\u5236\u3002<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u603b\u7ed3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>protected<\/em>&nbsp;\u662f Java \u4e2d\u8f83\u4e3a\u590d\u6742\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\u4e4b\u4e00\u3002\u5b83\u5728\u5305\u5185\u548c\u5b50\u7c7b\u4e2d\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u8bbf\u95ee\u6743\u9650\uff0c\u4f46\u5728\u8de8\u5305\u573a\u666f\u4e2d\u6709\u4e25\u683c\u7684\u9650\u5236\u3002\u7406\u89e3\u5176\u89c4\u5219\u6709\u52a9\u4e8e\u5728\u8bbe\u8ba1\u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\u65f6\u66f4\u597d\u5730\u63a7\u5236\u8bbf\u95ee\u6743\u9650\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">synchronized<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>synchronized<\/em>&nbsp;\u662fJava\u5185\u7f6e\u7684<strong>\u7ebf\u7a0b\u540c\u6b65\u673a\u5236<\/strong>\uff0c\u7528\u4e8e\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u4fdd\u8bc1<strong>\u539f\u5b50\u6027\u3001\u53ef\u89c1\u6027\u548c\u6709\u5e8f\u6027<\/strong>\u3002\u5b83\u901a\u8fc7**\u5bf9\u8c61\u76d1\u89c6\u5668\u9501\uff08Monitor\uff09**\u6765\u63a7\u5236\u591a\u4e2a\u7ebf\u7a0b\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u4e92\u65a5\u8bbf\u95ee\uff0c\u9632\u6b62\u7ade\u6001\u6761\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6838\u5fc3\u4f5c\u7528<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u5b50\u6027<\/strong>\uff1a\u786e\u4fdd\u540c\u6b65\u4ee3\u7801\u5757\u5728\u540c\u4e00\u65f6\u523b\u53ea\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u3002<\/li>\n\n\n\n<li><strong>\u53ef\u89c1\u6027<\/strong>\uff1a\u7ebf\u7a0b\u91ca\u653e\u9501\u524d\u4f1a\u5c06\u5de5\u4f5c\u5185\u5b58\u6570\u636e\u5237\u65b0\u5230\u4e3b\u5185\u5b58\uff0c\u5176\u4ed6\u7ebf\u7a0b\u83b7\u53d6\u9501\u65f6\u4f1a\u8bfb\u53d6\u6700\u65b0\u503c\u3002<\/li>\n\n\n\n<li><strong>\u6709\u5e8f\u6027<\/strong>\uff1a\u7981\u6b62\u540c\u6b65\u5757\u5185\u7684\u6307\u4ee4\u91cd\u6392\u5e8f\uff0c\u7b26\u5408JMM\u7684happens-before\u89c4\u5219\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e38\u7528\u7528\u6cd5<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4fee\u9970\u5b9e\u4f8b\u65b9\u6cd5<\/strong>\uff08\u9501\u5bf9\u8c61\u4e3a<em>this<\/em>\uff09<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public synchronized void deposit(double amount) {\n   balance += amount;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9002\u7528\u4e8e\u4fdd\u62a4\u5b9e\u4f8b\u53d8\u91cf\uff0c\u591a\u4e2a\u5b9e\u4f8b\u4e92\u4e0d\u5f71\u54cd\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4fee\u9970\u9759\u6001\u65b9\u6cd5<\/strong>\uff08\u9501\u5bf9\u8c61\u4e3a<em>Class<\/em>\u5bf9\u8c61\uff09<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>public static synchronized void increment() {\n   count++;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9002\u7528\u4e8e\u7c7b\u7ea7\u522b\u5171\u4eab\u8d44\u6e90\uff0c\u6240\u6709\u5b9e\u4f8b\u5171\u7528\u4e00\u628a\u9501\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u540c\u6b65\u4ee3\u7801\u5757<\/strong>\uff08\u53ef\u6307\u5b9a\u4efb\u610f\u9501\u5bf9\u8c61\uff09<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>private final Object lock = new Object();\npublic void update() {\n   synchronized (lock) {\n       \/\/ \u4ec5\u540c\u6b65\u5173\u952e\u4ee3\u7801\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u7ec6\u5316\u9501\u7c92\u5ea6\uff0c\u51cf\u5c11\u9501\u7ade\u4e89\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e95\u5c42\u539f\u7406<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7f16\u8bd1\u540e\u751f\u6210<em>monitorenter<\/em>\u548c<em>monitorexit<\/em>\u5b57\u8282\u7801\u6307\u4ee4\u3002<\/li>\n\n\n\n<li>JVM\u901a\u8fc7\u5bf9\u8c61\u5934\u7684<strong>Mark Word<\/strong>\u8bb0\u5f55\u9501\u72b6\u6001\uff08\u65e0\u9501\u3001\u504f\u5411\u9501\u3001\u8f7b\u91cf\u7ea7\u9501\u3001\u91cd\u91cf\u7ea7\u9501\uff09\u3002<\/li>\n\n\n\n<li><strong>\u9501\u5347\u7ea7\u8fc7\u7a0b<\/strong>\uff1a\u65e0\u9501 \u2192 \u504f\u5411\u9501 \u2192 \u8f7b\u91cf\u7ea7\u9501 \u2192 \u91cd\u91cf\u7ea7\u9501\uff0c\u5347\u7ea7\u4e0d\u53ef\u9006\u3002<\/li>\n\n\n\n<li>JDK 1.6\u540e\u5f15\u5165\u504f\u5411\u9501\u548c\u8f7b\u91cf\u7ea7\u9501\uff0c\u5927\u5e45\u4f18\u5316\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6027\u80fd\u4f18\u5316\u5efa\u8bae<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51cf\u5c0f\u9501\u7c92\u5ea6<\/strong>\uff1a\u62c6\u5206\u9501\u5bf9\u8c61\uff0c\u5141\u8bb8\u5e76\u884c\u8bbf\u95ee\u4e0d\u540c\u8d44\u6e90\u3002<\/li>\n\n\n\n<li><strong>\u7f29\u77ed\u9501\u6301\u6709\u65f6\u95f4<\/strong>\uff1a\u5c06\u8017\u65f6\u64cd\u4f5c\u79fb\u51fa\u540c\u6b65\u5757\u3002<\/li>\n\n\n\n<li><strong>\u9501\u6d88\u9664<\/strong>\uff1a\u5229\u7528JVM\u9003\u9038\u5206\u6790\u79fb\u9664\u4e0d\u5fc5\u8981\u7684\u9501\u3002<\/li>\n\n\n\n<li><strong>\u9501\u7c97\u5316<\/strong>\uff1a\u5408\u5e76\u8fde\u7eed\u7684\u52a0\u9501\u64cd\u4f5c\uff0c\u51cf\u5c11\u9501\u83b7\u53d6\u6b21\u6570\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e38\u89c1\u95ee\u9898<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6b7b\u9501<\/strong>\uff1a\u591a\u4e2a\u7ebf\u7a0b\u5faa\u73af\u7b49\u5f85\u5bf9\u65b9\u6301\u6709\u7684\u9501\uff0c\u53ef\u901a\u8fc7\u56fa\u5b9a\u52a0\u9501\u987a\u5e8f\u6216<em>tryLock<\/em>\u907f\u514d\u3002<\/li>\n\n\n\n<li><strong>\u9519\u8bef\u9501\u5bf9\u8c61<\/strong>\uff1a\u4f7f\u7528\u53ef\u53d8\u5bf9\u8c61\u6216\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u5bf9\u8c61\u4f5c\u4e3a\u9501\u53ef\u80fd\u5bfc\u81f4\u540c\u6b65\u5931\u6548\uff0c\u5e94\u4f7f\u7528<em>final<\/em>\u72ec\u7acb\u9501\u5bf9\u8c61\u3002<\/li>\n\n\n\n<li><strong>\u9ad8\u7ade\u4e89\u6027\u80fd\u74f6\u9888<\/strong>\uff1a\u53ef\u7528<em>Atomic<\/em>\u7c7b\uff08CAS\u4e50\u89c2\u9501\uff09\u3001<em>ReadWriteLock<\/em>\u6216\u5e76\u53d1\u5bb9\u5668\u66ff\u4ee3\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e0eLock\u63a5\u53e3\u5bf9\u6bd4<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>synchronized<\/em>\uff1a\u9690\u5f0f\u83b7\u53d6\/\u91ca\u653e\u9501\uff0c\u4e0d\u53ef\u4e2d\u65ad\uff0c\u4e0d\u652f\u6301\u8d85\u65f6\uff0c\u4ee3\u7801\u7b80\u6d01\uff0cJVM\u81ea\u52a8\u4f18\u5316\u3002<\/li>\n\n\n\n<li><em>Lock<\/em>\uff1a\u663e\u5f0f\u83b7\u53d6\/\u91ca\u653e\u9501\uff0c\u53ef\u4e2d\u65ad\u3001\u53ef\u8d85\u65f6\u3001\u53ef\u516c\u5e73\u9501\uff0c\u652f\u6301\u591a\u4e2a\u6761\u4ef6\u53d8\u91cf\uff0c\u9002\u5408\u590d\u6742\u540c\u6b65\u9700\u6c42\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u540c\u6b65\u4ee3\u7801\u5757\u9632\u6b62\u7ade\u6001<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Counter {\n   private int count = 0;\n   private final Object lock = new Object();\n   public void increment() {\n       synchronized (lock) {\n           count++;\n       }\n   }\n   public int getCount() {\n       synchronized (lock) {\n           return count;\n       }\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8be5\u5b9e\u73b0\u786e\u4fdd<em>count<\/em>\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5b89\u5168\u9012\u589e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>synchronized<\/em>\u7b80\u5355\u6613\u7528\uff0c\u9002\u5408\u5927\u591a\u6570\u7ebf\u7a0b\u5b89\u5168\u9700\u6c42\uff1b\u5728\u9ad8\u5e76\u53d1\u6216\u590d\u6742\u63a7\u5236\u573a\u666f\u4e0b\uff0c\u53ef\u7ed3\u5408<em>Lock<\/em>\u6216\u65e0\u9501\u7ed3\u6784\u63d0\u5347\u6027\u80fd\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">volatile <\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>volatile<\/em>&nbsp;\u662fJava\u4e2d\u7684<strong>\u8f7b\u91cf\u7ea7\u540c\u6b65\u673a\u5236<\/strong>\uff0c\u4e3b\u8981\u7528\u4e8e<strong>\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u5171\u4eab\u53d8\u91cf\u7684\u53ef\u89c1\u6027<\/strong>\u4ee5\u53ca<strong>\u9632\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f<\/strong>\uff0c\u4f46<strong>\u4e0d\u4fdd\u8bc1\u539f\u5b50\u6027<\/strong>\u3002\u5b83\u901a\u8fc7\u5728\u5e95\u5c42\u63d2\u5165**\u5185\u5b58\u5c4f\u969c\uff08Memory Barrier\uff09**\u6765\u5b9e\u73b0\u8bed\u4e49\uff0c\u786e\u4fdd\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u53d8\u91cf\u7684\u4fee\u6539\u80fd\u7acb\u5373\u88ab\u5176\u4ed6\u7ebf\u7a0b\u770b\u5230\uff0c\u5e76\u7981\u6b62\u7279\u5b9a\u7c7b\u578b\u7684\u91cd\u6392\u5e8f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6838\u5fc3\u7279\u6027<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u53ef\u89c1\u6027<\/strong>\uff1a\u7ebf\u7a0b\u5199\u5165<em>volatile<\/em>\u53d8\u91cf\u4f1a\u7acb\u5373\u5237\u65b0\u5230\u4e3b\u5185\u5b58\uff0c\u5176\u4ed6\u7ebf\u7a0b\u8bfb\u53d6\u65f6\u76f4\u63a5\u4ece\u4e3b\u5185\u5b58\u83b7\u53d6\u6700\u65b0\u503c\u3002<\/li>\n\n\n\n<li><strong>\u6709\u5e8f\u6027<\/strong>\uff1a\u7981\u6b62\u4e0e<em>volatile<\/em>\u53d8\u91cf\u76f8\u5173\u7684\u6307\u4ee4\u91cd\u6392\u5e8f\uff0c\u4fdd\u8bc1\u6267\u884c\u987a\u5e8f\u7b26\u5408\u9884\u671f\u3002<\/li>\n\n\n\n<li><strong>\u65e0\u539f\u5b50\u6027<\/strong>\uff1a\u590d\u5408\u64cd\u4f5c\uff08\u5982<em>i++<\/em>\uff09\u4ecd\u9700\u52a0\u9501\u6216\u4f7f\u7528\u539f\u5b50\u7c7b\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5178\u578b\u5e94\u7528\u573a\u666f<\/strong>\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u72b6\u6001\u6807\u8bb0<\/strong>\uff08\u7ebf\u7a0b\u505c\u6b62\u4fe1\u53f7\uff09<\/li>\n\n\n\n<li><strong>\u53cc\u91cd\u68c0\u67e5\u9501\u5b9a\u5355\u4f8b\u6a21\u5f0f<\/strong><\/li>\n\n\n\n<li><strong>\u5b89\u5168\u53d1\u5e03\u5bf9\u8c61<\/strong><\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u72b6\u6001\u6807\u8bb0<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class ShutdownHook extends Thread {\n   private volatile boolean shutdownRequested = false;\n   public void run() {\n       while (!shutdownRequested) {\n           \/\/ \u4e1a\u52a1\u903b\u8f91\n       }\n   }\n   public void shutdown() {\n       shutdownRequested = true;\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u5904<em>volatile<\/em>\u786e\u4fdd<em>shutdownRequested<\/em>\u7684\u4fee\u6539\u5bf9\u6240\u6709\u7ebf\u7a0b\u7acb\u5373\u53ef\u89c1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b\uff1a\u53cc\u91cd\u68c0\u67e5\u9501\u5b9a\u5355\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Singleton {\n   private static volatile Singleton instance;\n   public static Singleton getInstance() {\n       if (instance == null) {\n           synchronized (Singleton.class) {\n               if (instance == null) {\n                   instance = new Singleton();\n               }\n           }\n       }\n       return instance;\n   }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><em>volatile<\/em>\u9632\u6b62\u5bf9\u8c61\u521d\u59cb\u5316\u8fc7\u7a0b\u7684\u6307\u4ee4\u91cd\u6392\uff0c\u907f\u514d\u5176\u4ed6\u7ebf\u7a0b\u83b7\u53d6\u5230\u672a\u5b8c\u5168\u521d\u59cb\u5316\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e0esynchronized\u5bf9\u6bd4<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>volatile<\/strong>\uff1a\u4ec5\u4fdd\u8bc1\u53ef\u89c1\u6027\u548c\u6709\u5e8f\u6027\uff0c\u65e0\u9501\uff0c\u9ad8\u6027\u80fd\uff0c\u9002\u5408\u7b80\u5355\u72b6\u6001\u6807\u8bb0\u3002<\/li>\n\n\n\n<li><strong>synchronized<\/strong>\uff1a\u4fdd\u8bc1\u53ef\u89c1\u6027+\u539f\u5b50\u6027+\u4e92\u65a5\u6027\uff0c\u6709\u9501\uff0c\u9002\u5408\u590d\u6742\u540c\u6b65\u903b\u8f91\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6ce8\u610f\u4e8b\u9879<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u9002\u7528\u4e8e\u9700\u8981\u539f\u5b50\u6027\u7684\u573a\u666f\uff08\u5982\u8ba1\u6570\u5668\u7d2f\u52a0\uff09\u3002<\/li>\n\n\n\n<li>\u9002\u5408\u4fee\u9970\u5e03\u5c14\u3001\u5f15\u7528\u7b49\u7b80\u5355\u7c7b\u578b\u3002<\/li>\n\n\n\n<li>\u8fc7\u5ea6\u4f7f\u7528\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5e94\u5728\u786e\u6709\u53ef\u89c1\u6027\u6216\u91cd\u6392\u5e8f\u98ce\u9669\u65f6\u4f7f\u7528\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u603b\u7ed3<\/strong>\uff1a<em>volatile<\/em>\u662f\u5e76\u53d1\u7f16\u7a0b\u4e2d\u89e3\u51b3<strong>\u53ef\u89c1\u6027<\/strong>\u548c<strong>\u6709\u5e8f\u6027<\/strong>\u95ee\u9898\u7684\u5229\u5668\uff0c\u914d\u5408<em>happens-before<\/em>\u89c4\u5219\u53ef\u6784\u5efa\u9ad8\u6548\u7684\u7ebf\u7a0b\u5b89\u5168\u673a\u5236\uff0c\u4f46\u9700\u7ed3\u5408\u9501\u6216\u539f\u5b50\u7c7b\u6765\u5904\u7406\u539f\u5b50\u6027\u9700\u6c42\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5e38\u89c1\u5173\u952e\u5b57<\/h2>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">class<\/td><td class=\"has-text-align-center\" data-align=\"center\">const<\/td><td class=\"has-text-align-center\" data-align=\"center\">break<\/td><td class=\"has-text-align-center\" data-align=\"center\">byte<\/td><td class=\"has-text-align-center\" data-align=\"center\">super<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">enum<\/td><td class=\"has-text-align-center\" data-align=\"center\">extends<\/td><td class=\"has-text-align-center\" data-align=\"center\">continuee<\/td><td class=\"has-text-align-center\" data-align=\"center\">default<\/td><td class=\"has-text-align-center\" data-align=\"center\">try<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">if<\/td><td class=\"has-text-align-center\" data-align=\"center\">implements<\/td><td class=\"has-text-align-center\" data-align=\"center\">final<\/td><td class=\"has-text-align-center\" data-align=\"center\">finally<\/td><td class=\"has-text-align-center\" data-align=\"center\">case<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">short<\/td><td class=\"has-text-align-center\" data-align=\"center\">new <\/td><td class=\"has-text-align-center\" data-align=\"center\">import<\/td><td class=\"has-text-align-center\" data-align=\"center\">instanceof<\/td><td class=\"has-text-align-center\" data-align=\"center\">do<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">boolean<\/td><td class=\"has-text-align-center\" data-align=\"center\">static<\/td><td class=\"has-text-align-center\" data-align=\"center\">package<\/td><td class=\"has-text-align-center\" data-align=\"center\">private<\/td><td class=\"has-text-align-center\" data-align=\"center\">float<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">int<\/td><td class=\"has-text-align-center\" data-align=\"center\">switch<\/td><td class=\"has-text-align-center\" data-align=\"center\">void<\/td><td class=\"has-text-align-center\" data-align=\"center\">catch<\/td><td class=\"has-text-align-center\" data-align=\"center\">double<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">for<\/td><td class=\"has-text-align-center\" data-align=\"center\">interface<\/td><td class=\"has-text-align-center\" data-align=\"center\">public<\/td><td class=\"has-text-align-center\" data-align=\"center\">char<\/td><td class=\"has-text-align-center\" data-align=\"center\">else<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">goto<\/td><td class=\"has-text-align-center\" data-align=\"center\">long<\/td><td class=\"has-text-align-center\" data-align=\"center\">return<\/td><td class=\"has-text-align-center\" data-align=\"center\">this<\/td><td class=\"has-text-align-center\" data-align=\"center\">while<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bf4\u660e: true,false,null\u7b49\u5355\u8bcd\u5728Java\u8bed\u8a00\u4e2d\u4e0d\u5c5e\u4e8e\u5173\u952e\u5b57\uff0c\u800c\u5c5e\u4e8e\u4fdd\u7559\u5b57\uff0c\u5b83\u4eec\u4e5f\u4e0d\u80fd\u88ab\u7528\u6765\u547d\u540d\u6807\u8bc6\u7b26\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6807\u8bc6\u7b26\u547d\u540d\u89c4\u5219<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6807\u8bc6\u7b26\u53ef\u4ee5\u7531\u591a\u4e2a\u5355\u8bcd\u8fde\u63a5\u800c\u6210 \u5982 photoprice<\/li>\n\n\n\n<li>\u7c7b\u540d\u7684\u547d\u540d\uff1a\u6bcf\u4e2a\u5355\u8bcd\u7684\u9996\u5b57\u6bcd\u8981\u5927\u5199\uff0c\u5176\u4ed6\u5b57\u6bcd\u5c0f\u5199\u3002 \u5982 TeacherHelloWorld<\/li>\n\n\n\n<li>\u65b9\u6cd5\u540d\u548c\u53d8\u91cf\u540d\uff1a\u5982\u679c\u540d\u79f0\u53ea\u6709\u4e00\u4e2a\u5355\u8bcd\u5c31\u5168\u5c0f\u5199\uff0c\u5982\u679c\u7531\u591a\u4e2a\u5355\u8bcd\u7ec4\u6210\uff0c\u9664\u4e86\u7b2c\u4e00\u4e2a\u5355\u8bcd\u4ee5\u5916\u5176\u4ed6\u5355\u8bcd\u90fd\u9996\u5b57\u6bcd\u5927\u5199 \u5982stuName<\/li>\n\n\n\n<li>\u5e38\u91cf\u540d\uff1a\u6240\u6709\u5b57\u6bcd\u5927\u5199\uff0c\u591a\u4e2a\u5355\u8bcd\u7528_\u8fde\u63a5 \u5982 PAI MIN_VALUE<\/li>\n\n\n\n<li>\u5305\u540d\uff1a\u6240\u6709\u5355\u8bcd\u7684\u6240\u6709\u5b57\u6bcd\u90fd\u5c0f\u5199 \u5982 com.example<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java_day01 Java\u57fa\u7840 Java\u7b80\u4ecb Java \u662f\u7531 Sun Microsystems \u516c\u53f8\u4e8e 1 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