“`” Java\u865a\u62df\u673a\uff08JVM\uff09\u662f\u8fd0\u884c Java \u5b57\u8282\u7801\u7684\u865a\u62df\u673a\u3002JVM\u6709\u9488\u5bf9\u4e0d\u540c\u7cfb\u7edf\u7684\u7279\u5b9a\u5b9e\u73b0\uff08Windows\uff0cLinux\uff0cmacOS\uff09\uff0c\u76ee\u7684\u662f\u4f7f\u7528\u76f8\u540c\u7684\u5b57\u8282\u7801\uff0c\u5b83\u4eec\u90fd\u4f1a\u7ed9\u51fa\u76f8\u540c\u7684\u7ed3\u679c\u3002<\/p>\n
<strong>\u4ec0\u4e48\u662f\u5b57\u8282\u7801?\u91c7\u7528\u5b57\u8282\u7801\u7684\u597d\u5904\u662f\u4ec0\u4e48?<\/strong><\/p><\/p>\n
<blockquote>\u5728 Java \u4e2d\uff0cJVM\u53ef\u4ee5\u7406\u89e3\u7684\u4ee3\u7801\u5c31\u53eb\u505a<code>\u5b57\u8282\u7801<\/code>\uff08\u5373\u6269\u5c55\u540d\u4e3a <code>.class<\/code> \u7684\u6587\u4ef6\uff09\uff0c\u5b83\u4e0d\u9762\u5411\u4efb\u4f55\u7279\u5b9a\u7684\u5904\u7406\u5668\uff0c\u53ea\u9762\u5411\u865a\u62df\u673a\u3002Java \u8bed\u8a00\u901a\u8fc7\u5b57\u8282\u7801\u7684\u65b9\u5f0f\uff0c\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u4e86\u4f20\u7edf\u89e3\u91ca\u578b\u8bed\u8a00\u6267\u884c\u6548\u7387\u4f4e\u7684\u95ee\u9898\uff0c\u540c\u65f6\u53c8\u4fdd\u7559\u4e86\u89e3\u91ca\u578b\u8bed\u8a00\u53ef\u79fb\u690d\u7684\u7279\u70b9\u3002\u6240\u4ee5 Java \u7a0b\u5e8f\u8fd0\u884c\u65f6\u6bd4\u8f83\u9ad8\u6548\uff0c\u800c\u4e14\uff0c\u7531\u4e8e\u5b57\u8282\u7801\u5e76\u4e0d\u9488\u5bf9\u4e00\u79cd\u7279\u5b9a\u7684\u673a\u5668\uff0c\u56e0\u6b64\uff0cJava\u7a0b\u5e8f\u65e0\u987b\u91cd\u65b0\u7f16\u8bd1\u4fbf\u53ef\u5728\u591a\u79cd\u4e0d\u540c\u64cd\u4f5c\u7cfb\u7edf\u7684\u8ba1\u7b97\u673a\u4e0a\u8fd0\u884c\u3002<\/p><\/blockquote><\/p>\n
<p><strong>Java \u7a0b\u5e8f\u4ece\u6e90\u4ee3\u7801\u5230\u8fd0\u884c\u4e00\u822c\u6709\u4e0b\u97623\u6b65\uff1a<\/strong><\/p>\n
<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200417\/a8c00f1c-981c-418e-8798-7e709a957af4.png"" style=""width: 50%;""><br><\/p>\n
\u6211\u4eec\u9700\u8981\u683c\u5916\u6ce8\u610f\u7684\u662f .class->\u673a\u5668\u7801 \u8fd9\u4e00\u6b65\u3002\u5728\u8fd9\u4e00\u6b65 JVM \u7c7b\u52a0\u8f7d\u5668\u9996\u5148\u52a0\u8f7d\u5b57\u8282\u7801\u6587\u4ef6\uff0c\u7136\u540e\u901a\u8fc7\u89e3\u91ca\u5668\u9010\u884c\u89e3\u91ca\u6267\u884c\uff0c\u8fd9\u79cd\u65b9\u5f0f\u7684\u6267\u884c\u901f\u5ea6\u4f1a\u76f8\u5bf9\u6bd4\u8f83\u6162\u3002\u800c\u4e14\uff0c\u6709\u4e9b\u65b9\u6cd5\u548c\u4ee3\u7801\u5757\u662f\u7ecf\u5e38\u9700\u8981\u88ab\u8c03\u7528\u7684(\u4e5f\u5c31\u662f\u6240\u8c13\u7684\u70ed\u70b9\u4ee3\u7801)\uff0c\u6240\u4ee5\u540e\u9762\u5f15\u8fdb\u4e86 JIT \u7f16\u8bd1\u5668\uff0c\u800cJIT \u5c5e\u4e8e\u8fd0\u884c\u65f6\u7f16\u8bd1\u3002\u5f53 JIT \u7f16\u8bd1\u5668\u5b8c\u6210\u7b2c\u4e00\u6b21\u7f16\u8bd1\u540e\uff0c\u5176\u4f1a\u5c06\u5b57\u8282\u7801\u5bf9\u5e94\u7684\u673a\u5668\u7801\u4fdd\u5b58\u4e0b\u6765\uff0c\u4e0b\u6b21\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002\u800c\u6211\u4eec\u77e5\u9053\uff0c\u673a\u5668\u7801\u7684\u8fd0\u884c\u6548\u7387\u80af\u5b9a\u662f\u9ad8\u4e8e Java \u89e3\u91ca\u5668\u7684\u3002\u8fd9\u4e5f\u89e3\u91ca\u4e86\u6211\u4eec\u4e3a\u4ec0\u4e48\u7ecf\u5e38\u4f1a\u8bf4 Java \u662f\u7f16\u8bd1\u4e0e\u89e3\u91ca\u5171\u5b58\u7684\u8bed\u8a00\u3002<\/p>\n
<blockquote>HotSpot\u91c7\u7528\u4e86\u60f0\u6027\u8bc4\u4f30(Lazy Evaluation)\u7684\u505a\u6cd5\uff0c\u6839\u636e\u4e8c\u516b\u5b9a\u5f8b\uff0c\u6d88\u8017\u5927\u90e8\u5206\u7cfb\u7edf\u8d44\u6e90\u7684\u53ea\u6709\u90a3\u4e00\u5c0f\u90e8\u5206\u7684\u4ee3\u7801\uff08\u70ed\u70b9\u4ee3\u7801\uff09\uff0c\u800c\u8fd9\u4e5f\u5c31\u662fJIT\u6240\u9700\u8981\u7f16\u8bd1\u7684\u90e8\u5206\u3002JVM\u4f1a\u6839\u636e\u4ee3\u7801\u6bcf\u6b21\u88ab\u6267\u884c\u7684\u60c5\u51b5\u6536\u96c6\u4fe1\u606f\u5e76\u76f8\u5e94\u5730\u505a\u51fa\u4e00\u4e9b\u4f18\u5316\uff0c\u56e0\u6b64\u6267\u884c\u7684\u6b21\u6570\u8d8a\u591a\uff0c\u5b83\u7684\u901f\u5ea6\u5c31\u8d8a\u5feb\u3002JDK 9\u5f15\u5165\u4e86\u4e00\u79cd\u65b0\u7684\u7f16\u8bd1\u6a21\u5f0fAOT(Ahead of Time Compilation)\uff0c\u5b83\u662f\u76f4\u63a5\u5c06\u5b57\u8282\u7801\u7f16\u8bd1\u6210\u673a\u5668\u7801\uff0c\u8fd9\u6837\u5c31\u907f\u514d\u4e86JIT\u9884\u70ed\u7b49\u5404\u65b9\u9762\u7684\u5f00\u9500\u3002JDK\u652f\u6301\u5206\u5c42\u7f16\u8bd1\u548cAOT\u534f\u4f5c\u4f7f\u7528\u3002\u4f46\u662f \uff0cAOT \u7f16\u8bd1\u5668\u7684\u7f16\u8bd1\u8d28\u91cf\u662f\u80af\u5b9a\u6bd4\u4e0d\u4e0a JIT \u7f16\u8bd1\u5668\u7684\u3002<\/p><\/blockquote><\/p>\n
<p><strong>\u603b\u7ed3\uff1a<\/strong><\/p>\n
Java\u865a\u62df\u673a\uff08JVM\uff09\u662f\u8fd0\u884c Java \u5b57\u8282\u7801\u7684\u865a\u62df\u673a\u3002JVM\u6709\u9488\u5bf9\u4e0d\u540c\u7cfb\u7edf\u7684\u7279\u5b9a\u5b9e\u73b0\uff08Windows\uff0cLinux\uff0cmacOS\uff09\uff0c\u76ee\u7684\u662f\u4f7f\u7528\u76f8\u540c\u7684\u5b57\u8282\u7801\uff0c\u5b83\u4eec\u90fd\u4f1a\u7ed9\u51fa\u76f8\u540c\u7684\u7ed3\u679c\u3002\u5b57\u8282\u7801\u548c\u4e0d\u540c\u7cfb\u7edf\u7684 JVM \u5b9e\u73b0\u662f Java \u8bed\u8a00\u201c\u4e00\u6b21\u7f16\u8bd1\uff0c\u968f\u5904\u53ef\u4ee5\u8fd0\u884c\u201d\u7684\u5173\u952e\u6240\u5728\u3002 <\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” Java\u865a\u62df\u673a\uff08JVM\uff09\u662f\u8fd0\u884c Java \u5b57\u8282\u7801\u7684\u865a\u62df\u673a\u3002JVM\u6709\u9488\u5bf9\u4e0d\u540c\u7cfb\u7edf […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37327","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37327","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37327"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37327\/revisions"}],"predecessor-version":[{"id":37328,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37327\/revisions\/37328"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37327"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}