{"id":31040,"date":"2023-12-21T02:22:30","date_gmt":"2023-04-24T11:54:45","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e5%bc%80%e5%8f%91%e3%80%91java%e7%9a%84%e5%86%85%e5%ad%98\/"},"modified":"2025-08-12T22:00:45","modified_gmt":"2025-08-12T14:00:45","slug":"%e3%80%90java%e5%bc%80%e5%8f%91%e3%80%91java%e7%9a%84%e5%86%85%e5%ad%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90java%e5%bc%80%e5%8f%91%e3%80%91java%e7%9a%84%e5%86%85%e5%ad%98\/","title":{"rendered":"\u3010Java\u5f00\u53d1\u3011Java\u7684\u5185\u5b58"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5927\u5bb6\u597d\uff01<\/p>\n<p>DreamHanks\u6709254\u5398\u7c73\u9ad8\u3002<\/p>\n<p>\u5728\u4e4b\u524d\u7684Java\u6587\u7ae0\u4e2d\u5df2\u7ecf\u9010\u6e10\u63d0\u53ca\u4e86\u8fd9\u4e00\u70b9\u3002<\/p>\n<p>\u6211\u6253\u7b97\u7b80\u5355\u5730\u5904\u7406\u4e00\u4e0b\u4e4b\u524d\u6ca1\u6709\u5904\u7406\u8fc7\u7684\u5185\u5b58\u3002<\/p>\n<p>\u4ee5\u4e0b\u662fJava\u6587\u7ae0\u7684\u6458\u8981\u3002<\/p>\n<h2>Java\u865a\u62df\u673a<\/h2>\n<p>\u5728\u8ba8\u8bba\u5185\u5b58\u4e4b\u524d\uff0c\u9700\u8981\u5148\u4e86\u89e3JVM\u8fd9\u4e2a\u4e1c\u897f\u3002<\/p>\n<p>JVM\u662fJava Virtual Machine\u7684\u7b80\u5199\uff0c\u7528\u4e8e\u5b9e\u9645\u6267\u884cJava\u7a0b\u5e8f\u3002<\/p>\n<p>JVM\u4e0d\u53d7CPU\u6216\u64cd\u4f5c\u7cfb\u7edf\u7684\u9650\u5236\uff0c\u53ef\u4ee5\u6267\u884cJava\u7a0b\u5e8f\u3002<\/p>\n<p>JVM\u7684\u5185\u90e8\u5305\u542b\u4e86\u7c7b\u52a0\u8f7d\u5668\u3001\u6267\u884c\u5f15\u64ce\u3001\u5783\u573e\u56de\u6536\u5668\u548c\u8fd0\u884c\u65f6\u6570\u636e\u533a\u7b49\u7ec4\u4ef6\u3002<\/p>\n<p>\u672c\u8282\u4e2d\u53ea\u6d89\u53ca\u201c\u5783\u573e\u6536\u96c6\u5668\u201d\u548c\u201c\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\u201d\uff0c\u5373\u4f7f\u6709\u5176\u4ed6\u7ec4\u6210\u90e8\u5206\u3002<\/p>\n<h3>\u5783\u573e\u6536\u96c6\u5458<\/h3>\n<p>\u5783\u573e\u6536\u96c6\u5668\u8d1f\u8d23JVM\u7684\u5185\u5b58\u7ba1\u7406\u3002<\/p>\n<p>\u5783\u573e\u6536\u96c6\u5668\u662f\u7528\u4e8e\u6e05\u7406\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u5185\u5b58\u7684\u5de5\u5177\u3002<\/p>\n<h3>\u8fd0\u884c\u65f6\u6570\u636e\u533a<\/h3>\n<p>\u5f53Java\u7a0b\u5e8f\u8fd0\u884c\u65f6\uff0c\u8fd0\u884c\u65f6\u6570\u636e\u533a\u662f\u5b58\u50a8\u5b9e\u9645\u6570\u636e\u7684\u7a7a\u95f4\u3002<\/p>\n<p>\u8fd9\u4e2a\u7a7a\u95f4\u88ab\u5206\u4e3aMethod\u533a\u57df\u3001Heap\u533a\u57df\u3001Stack\u533a\u57df\u3001PC\u5bc4\u5b58\u5668\u533a\u57df\u548c\u672c\u5730\u65b9\u6cd5\u6808\u533a\u57df\u3002<\/p>\n<p>\u672c\u6b21\u53ea\u6d89\u53caMethod\u3001Heap\u548cStack\u533a\u57df\u3002<\/p>\n<h2>\u65b9\u6cd5\u9886\u57df<\/h2>\n<p>\u65b9\u6cd5\u9886\u57df\u662f\u6536\u96c6\u7c7b\u4fe1\u606f\u7684\u5730\u65b9\u3002<\/p>\n<p>\u7c7b\u7684\u5b57\u6bb5\u53d8\u91cf\u7684\u540d\u79f0\u3001\u6570\u636e\u7c7b\u578b\u3001\u8bbf\u95ee\u63a7\u5236\u4fe1\u606f\u7b49\u5b57\u6bb5\u4fe1\u606f\u3002<\/p>\n<p>\u65b9\u6cd5\u7684\u540d\u79f0\u3001\u8fd4\u56de\u503c\u7684\u6570\u636e\u7c7b\u578b\u3001\u53c2\u6570\u3001\u4ee5\u53ca\u8bbf\u95ee\u4fee\u9970\u7b26\u4e4b\u7c7b\u7684\u65b9\u6cd5\u4fe1\u606f\u3002<\/p>\n<p>\u8fd9\u662f\u50a8\u5b58\u9759\u6001\u53d8\u91cf\u3001final\u7c7b\u53d8\u91cf\u7b49\u7684\u533a\u57df\u3002<\/p>\n<p>\u5728\u8fd9\u91cc\uff0c\u9759\u6001\u53d8\u91cf\u5728JVM\u6267\u884cJava\u7a0b\u5e8f\u65f6\u88ab\u5206\u914d\u5185\u5b58\u3002<\/p>\n<p>\u5f53\u7a0b\u5e8f\u7ed3\u675f\u65f6\uff0c\u5185\u5b58\u5c06\u88ab\u91ca\u653e\u3002<\/p>\n<p>\u56e0\u6b64\uff0cstatic\u53d8\u91cf\u5728\u7a0b\u5e8f\u6267\u884c\u671f\u95f4\u4fdd\u6301\u751f\u6210\u5e76\u53ef\u5728\u4efb\u4f55\u5730\u65b9\u4f7f\u7528\u3002<\/p>\n<h2>\u5806\u9886\u57df<\/h2>\n<p>\u867d\u7136\u5806\u7684\u9886\u57df\u53ef\u4ee5\u7ec6\u5206\u4e3a\u51e0\u4e2a\u90e8\u5206\u8fdb\u884c\u8be6\u7ec6\u89e3\u91ca\uff0c\u4f46\u672c\u6b21\u5c06\u5ffd\u7565\u8fd9\u4e9b\u3002<\/p>\n<p>\u5806\u9886\u57df\u662f\u5b58\u50a8\u7531new\u751f\u6210\u7684\u5bf9\u8c61\u548c\u6570\u7ec4\u6570\u636e\u7684\u533a\u57df\u3002<\/p>\n<p>\u6837\u672c<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ExampleCalss<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Human<\/span> <span class=\"n\">human<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Human<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Human<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">int<\/span> <span class=\"n\">age<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u7c7b\u5b57\u6bb5\u7684\u4fe1\u606f\u5b58\u50a8\u5728\u65b9\u6cd5\u533a\u3002<\/p>\n<p>\u5f53\u5728\u65b0\u7684\u7c7b\u4e2d\u8c03\u7528\u6784\u9020\u51fd\u6570\u65f6\uff0c\u5c06\u751f\u6210\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u5806\u5185\u5b58\u4e2d\u3002<\/p>\n<p>\u5728\u90a3\u65f6\uff0c\u6bcf\u4e2a\u5b9e\u4f8b\u90fd\u80fd\u591f\u5206\u914d\u5185\u5b58\u5e76\u5c06\u503c\u8d4b\u7ed9\u5b57\u6bb5\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/35-0.png\" alt=\"20200929 Heap \uc601\uc5ed \ucca8\ubd80\uc790\ub8cc1.png\" \/><\/div>\n<h3>Heap\u533a\u57df\u4e2d\u5783\u573e\u56de\u6536\u5668\u7684\u804c\u8d23\u3002<\/h3>\n<p>\u5783\u573e\u6536\u96c6\u5668\u4f1a\u5220\u9664\u65e0\u4eba\u4f7f\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n<p>\u6837\u672c<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ExampleCalss<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{![<\/span><span class=\"mi\">20200929<\/span> <span class=\"nc\">Heap<\/span> <span class=\"n\">\uc601\uc5ed<\/span> <span class=\"n\">\ucca8\ubd80\uc790\ub8cc2<\/span><span class=\"o\">.<\/span><span class=\"na\">png<\/span><span class=\"o\">](<\/span><span class=\"nl\">https:<\/span><span class=\"c1\">\/\/qiita-image-store.s3.ap-northeast-1.amazonaws.com\/0\/708649\/f85e9c28-dbe5-db5d-edd1-6a75a4b54065.png)<\/span>\r\n\r\n        <span class=\"nc\">Human<\/span> <span class=\"n\">human<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Human<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">human<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"n\">human<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Human<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">Human<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">int<\/span> <span class=\"n\">age<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u770b\u5230\u4e0a\u9762\u7684\u793a\u4f8b\uff0c\u4eba\u4e3a\u5730\u5c06\u5185\u5b58\u5730\u5740\u6307\u5411 null\u3002<\/p>\n<p>\u7136\u540e\u521b\u5efa\u4e00\u4e2a\u65b0\u7684human\u5b9e\u4f8b\u5e76\u5c06\u5176\u5f15\u7528\u3002<\/p>\n<p>\u6362\u8a00\u4e4b\uff0c\u5206\u914d\u7ed9\u7b2c\u4e00\u4e2a\u5b9e\u4f8b\u7684\u6ca1\u6709\u88ab\u4efb\u4f55\u4eba\u5f15\u7528\u3002<\/p>\n<p>\u8fd9\u79cd\u5185\u5b58\u7a7a\u95f4\uff08\u7b2c\u4e00\u4e2a\u5b9e\u4f8b\uff09\u5c06\u6210\u4e3a\u5783\u573e\u56de\u6536\u7684\u76ee\u6807\u3002<\/p>\n<p>\u203b\u5783\u573e\u56de\u6536\uff08Garbage Collection\uff09\u8868\u793a\u5783\u573e\u6536\u96c6\u5668\u6e05\u9664\u4e0d\u88ab\u4efb\u4f55\u5f15\u7528\u7684\u5185\u5b58\u64cd\u4f5c\u7684\u610f\u601d\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/45-0.png\" alt=\"image.png\" \/><\/div>\n<h2>\u5806\u6808\u9886\u57df<\/h2>\n<p>\u5c40\u90e8\u53d8\u91cf\u3001\u53c2\u6570\u3001\u8fd4\u56de\u503c\u7b49\u6570\u636e\u5b58\u50a8\u533a\u57df\u3002<\/p>\n<p>\u5728\u5806\u6808\u9886\u57df\u4e2d\uff0c\u57fa\u672c\u7c7b\u578b\u7684\u53d8\u91cf\u5b58\u50a8\u7740\u53d8\u91cf\u672c\u8eab\u4ee5\u53ca\u5176\u6570\u636e\u3002<\/p>\n<p>\u53c2\u7167\u578b\uff08\u5bf9\u8c61\uff09\u53ea\u5b58\u50a8\u5b9e\u4f8b\u7684\u5730\u5740\uff0c\u800c\u5b9e\u9645\u7684\u6570\u636e\u5b58\u50a8\u5728\u5806\u5185\u5b58\u4e2d\u3002<\/p>\n<p>\u6bcf\u6b21\u8c03\u7528\u65b9\u6cd5\u65f6\uff0cStack\u9886\u57df\u90fd\u4f1a\u4e2a\u522b\u521b\u5efa\u3002<\/p>\n<p>\u6837\u54c1<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">ExampleCalss<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kt\">int<\/span> <span class=\"n\">age<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"n\">age<\/span> <span class=\"o\">=<\/span> <span class=\"n\">mutiply<\/span><span class=\"o\">(<\/span><span class=\"n\">age<\/span><span class=\"o\">,<\/span> <span class=\"mi\">4<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">static<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">mutiply<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">num1<\/span><span class=\"o\">,<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">num2<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kt\">int<\/span> <span class=\"n\">result<\/span> <span class=\"o\">=<\/span> <span class=\"n\">num1<\/span><span class=\"o\">*<\/span><span class=\"n\">num2<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">result<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u8981\u6309\u987a\u5e8f\u8bf4\u660e\u4e0a\u8ff0\u7684\u60c5\u51b5\uff08\u5ffd\u7565args\uff09\uff0c\u5219\uff1a<\/p>\n<p>\u5728Java\u4e2d\uff0c\u4f1a\u521b\u5efamain\u65b9\u6cd5\u7684\u5806\u6808\u7a7a\u95f4\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/55-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u2461 \u5e74\u9f84\u88ab\u751f\u6210\u5e76\u521d\u59cb\u5316\u4e3a10\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/57-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u2462 \u8c03\u7528multiply\u65b9\u6cd5\uff0c\u751f\u6210\u4e86\u4e00\u4e2a\u6808\u7a7a\u95f4\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/59-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u2463 multiply\u7684\u53c2\u6570\u88ab\u751f\u6210\u5e76\u7528\u4f20\u9012\u7684\u503c\u521d\u59cb\u5316\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/61-0.png\" alt=\"image.png\" \/><\/div>\n<p>5. \u751f\u6210value\u5e76\u5c06\u8ba1\u7b97\u7ed3\u679c\u8d4b\u503c\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/63-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u2465 \u6267\u884creturn\u5e76\u7ed3\u675fmultiply\u7684\u6267\u884c\u3002\u7136\u540e\uff0c\u5728Stack\u4e2d\u5220\u9664multiply\u4f7f\u7528\u7684\u53d8\u91cf\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/65-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u2466 multiply\u65b9\u6cd5\u7684\u6267\u884c\u7ed3\u679c\u5c06\u88ab\u5206\u914d\u7ed9age\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0a1537434c4406be34a4\/67-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u5f53 main \u65b9\u6cd5\u7ed3\u675f\u65f6\uff0cmain \u65b9\u6cd5\u4e2d\u4f7f\u7528\u7684\u53d8\u91cf\u5c06\u88ab\u5220\u9664\u3002<\/p>\n<h1>\u7ed3\u675f\u3002<\/h1>\n<p>\u672c\u6b21\u6587\u7ae0\u81f3\u6b64\u7ed3\u675f\u3002<\/p>\n<p>\u8c22\u8c22\u60a8\u7684\u5149\u4e34\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u7684\u6587\u7ae0\u5c06\u5728DreamHanks\u7684\u535a\u5ba2\u4e0a\u8fde\u8f7d\u3002<\/p>\n<p>\u4f60\u4eec\u53ef\u4ee5\u5728\u8fd9\u91cc\u67e5\u770b\u6211\u4eec\u7684\u6700\u65b0\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u5927\u5bb6\u597d\uff01 DreamHanks\u6709254\u5398\u7c73\u9ad8\u3002 \u5728\u4e4b\u524d\u7684Java\u6587\u7ae0\u4e2d\u5df2\u7ecf\u9010\u6e10\u63d0\u53ca\u4e86\u8fd9\u4e00\u70b9\u3002 \u6211\u6253\u7b97\u7b80\u5355 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