{"id":31474,"date":"2023-11-30T11:23:07","date_gmt":"2023-03-30T08:51:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%99%e6%98%afjava%e8%84%9a%e6%9c%ac%e5%90%97%ef%bc%9f\/"},"modified":"2024-05-04T11:28:41","modified_gmt":"2024-05-04T03:28:41","slug":"%e8%bf%99%e6%98%afjava%e8%84%9a%e6%9c%ac%e5%90%97%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e8%bf%99%e6%98%afjava%e8%84%9a%e6%9c%ac%e5%90%97%ef%bc%9f\/","title":{"rendered":"\u8fd9\u662fJava\u811a\u672c\u5417\uff1f"},"content":{"rendered":"<p>\u5c0d\u65bc\u6b63\u5728\u5c0b\u627eJavaScript\u76f8\u95dc\u6587\u7ae0\u7684\u5927\u5bb6\uff0c\u5f88\u62b1\u6b49\u672c\u5167\u5bb9\u53ef\u80fd\u7121\u6cd5\u70ba\u60a8\u63d0\u4f9b\u5e6b\u52a9\uff0c\u8acb\u6309\u700f\u89bd\u5668\u7684\u8fd4\u56de\u6309\u9215\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u9019\u662f\u4e00\u500b\u76f8\u7576\u56b4\u8085\u7684 Java \u7b11\u8a71\uff0c\u56e0\u6b64\u6211\u5011\u8acb\u8af8\u4f4dJava\u521d\u5b78\u8005\u4e0d\u8981\u7576\u771f\u5c0d\u5f85\u3002<\/p>\n<h1>\u4eceOpenJDK 11 \u5f00\u59cb\uff0c\u53ef\u4ee5\u76f4\u63a5\u8fd0\u884cJava\u6587\u4ef6\u3002<\/h1>\n<p>\u6700\u8fd1\u6211\u521a\u521a\u77e5\u9053\uff0c\u5728OpenJDK 11\u4e2d\u5f15\u5165\u4e86JEP 330\uff1a\u542f\u52a8\u5355\u6587\u4ef6\u6e90\u4ee3\u7801\u7a0b\u5e8f\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528javac\u7b49\u7f16\u8bd1\u7684\u60c5\u51b5\u4e0b\u8fd0\u884c\u5355\u4e2aJava\u6587\u4ef6\u7684\u7a0b\u5e8f\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30bd\u30fc\u30b9\u30fb\u30d5\u30a1\u30a4\u30eb\u30fb\u30e2\u30fc\u30c9\u3067\u5358\u4e00\u30d5\u30a1\u30a4\u30eb\u306e\u30bd\u30fc\u30b9\u30fb\u30b3\u30fc\u30c9\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8d77\u52d5\u3059\u308b\u65b9\u6cd5<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">JEP-330 Single-FIle Source-Code Programs \u3063\u3066\u4f55\uff1f Java \u30d5\u30a1\u30a4\u30eb\u304c java \u30b3\u30de\u30f3\u30c9\u3067\u5b9f\u884c\u3067\u304d\u308b\u3063\u3066\u30db\u30f3\u30c8\uff1f\uff01 shebang \u3067\u3069\u3046\u6307\u5b9a\u3059\u308b\u306e\uff1f\u8abf\u3079\u3066\u307f\u305f\uff01<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u3010Modern Java\u3011JEP 330 Launch Single-File Source-Code Programs<\/ul>\n<p>\u5728Shell\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u5404\u79cd\u811a\u672c\uff0c\u5bf9\u5427\uff1f\u5728\u6267\u884c\u5e26\u6709\u53ef\u6267\u884c\u5c5e\u6027\u7684\u811a\u672c\u6587\u4ef6\u65f6\uff0cUnix\u7cfb\u7edf\u6839\u636eshebang\u7684\u6307\u5b9a\u6765\u89e3\u91ca\u8be5\u811a\u672c\u7684\u7a0b\u5e8f\u3002\u50cf#!\/bin\/sh\u6216#!\/bin\/bash\u8fd9\u6837\u6307\u5b9a\u4e86Shell\u7684\u811a\u672c\u88ab\u79f0\u4e3a&#8221;Shell\u811a\u672c&#8221;\uff0c\u800c\u50cf#!\/usr\/bin\/env perl\u8fd9\u6837\u6307\u5b9a\u4e86\u811a\u672c\u8bed\u8a00\u7684\u811a\u672c\u88ab\u79f0\u4e3a&#8221;Perl\u811a\u672c&#8221;\u3002\u90a3\u4e48\uff0c\u5982\u679c\u6307\u5b9a\u4e86#!\/usr\/bin\/env java\uff0c\u8fd9\u4e2a\u811a\u672c\u5c31\u88ab\u79f0\u4e3a&#8221;Java\u811a\u672c&#8221;\uff0c\u4e0d\u662f\u5417\uff1f<\/p>\n<p>\u6211\u5728 macOS \u4e0a\u5b89\u88c5\u4e86 OpenJDK 15 \u8fdb\u884c\u4e86\u5c1d\u8bd5\uff0c\u4f46\u5e78\u597d\u5728\u4e4b\u524d\u7684\u535a\u5ba2\u6587\u7ae0\u4e2d\uff0cmike_neck \u5df2\u7ecf\u786e\u5b9a\u4e86\u53ef\u80fd\u51fa\u73b0\u95ee\u9898\u7684\u5730\u65b9\uff0c\u6240\u4ee5\u6211\u5f88\u987a\u5229\u5730\u6267\u884c\u4e86\u3002\u8fd9\u770b\u8d77\u6765\u5f88\u6709\u8da3\u3002<\/p>\n<h1>Java\u811a\u672c\u7684\u6587\u4ef6\u683c\u5f0f<\/h1>\n<p>\u867d\u7136\u6211\u8fd8\u6ca1\u6709\u5b8c\u5168\u638c\u63e1\u89c4\u8303\uff0c\u4f46\u6211\u9996\u5148\u4f1a\u8ba4\u771f\u67e5\u770bJEP 330\u3002\u5373\u4f7f\u53c2\u8003\u4e86Oracle\u7684\u6587\u6863\uff0c\u6700\u7ec8\u8fd8\u662f\u5199\u9053\u8981\u67e5\u770bJEP 330\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a\u901a\u5e38\u811a\u672c\u90fd\u4ee5 shebang \u5f00\u5934\uff0c\u6240\u4ee5\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5c06 JEP 330 \u4e2d\u79f0\u4e3a shebang \u6587\u4ef6\u7684\u5185\u5bb9\u79f0\u4e3a Java \u811a\u672c\u3002<\/p>\n<blockquote><p>#!\/path\/to\/java &#8211;\u6e90\u4ee3\u7801\u7248\u672c<\/p><\/blockquote>\n<p>\u5728JEP 330\u4e2d\u63d0\u5230\uff0c\u53ef\u4ee5\u5728\u7b2c\u4e00\u884c\u4e2d\u7f16\u5199\u5982\u4e0a\u6240\u8ff0\u7684shebang\u3002\u7136\u800c\uff0c\u6211\u8ba4\u4e3a\u901a\u8fc7\u4f7f\u7528#!\/usr\/bin\/env java &#8211;source 11\u8fd9\u6837\u7684env\u65b9\u5f0f\u53ef\u4ee5\u63d0\u9ad8\u53ef\u79fb\u690d\u6027\u3002<\/p>\n<blockquote><p>\u5728\u4e00\u4e2ashebang\u6587\u4ef6\u4e2d\uff0c\u524d\u4e24\u4e2a\u5b57\u8282\u5fc5\u987b\u662f0x23 0x21\u3002<\/p><\/blockquote>\n<p>\u5979\u7684 shebang \u5fc5\u987b\u662f\u75310x23 0x21 \u5b57\u8282\u5e8f\u5217\u7ec4\u6210\u3002\u5982\u679c\u60f3\u8981\u7528 Java \u7f16\u5199\uff0c\u4e5f\u5fc5\u987b\u5c06\u6700\u5f00\u59cb\u7684\u4e24\u4e2a\u5b57\u8282\u50cf UTF-8 \u90a3\u6837\u5199\u5165\u3002<\/p>\n<blockquote><p>shebang \u6587\u4ef6\u7684\u540d\u79f0\u4e0d\u7b26\u5408 Java \u6e90\u6587\u4ef6\u7684\u6807\u51c6\u547d\u540d\u89c4\u8303\u3002<\/p><\/blockquote>\n<p>\u8fd9\u57fa\u672c\u4e0a\u610f\u601d\u5c31\u662f\uff0c\u4e0d\u7ba1\u662f public class Hello \u8fd8\u662f Hello.java\uff0c\u6587\u4ef6\u540d\u53ef\u4ee5\u662f hello \u6216 foobar \u7b49\u5176\u4ed6\u540d\u79f0\u3002\u867d\u7136\u4e0d\u786e\u5b9a\u662f\u5426\u6709\u610f\u4e3a\u4e4b\uff0c\u4f46\u6b63\u5982\u4e0b\u9762\u7684\u4f8b\u5b50\u4e00\u6837\uff0c\u5373\u4f7f\u4e00\u4e2a\u6587\u4ef6\u4e2d\u6709\u591a\u4e2a public class\uff0c\u4e5f\u80fd\u6b63\u5e38\u8fd0\u884c\uff01<\/p>\n<blockquote><p>\u5f53\u542f\u52a8\u5668\u8bfb\u53d6\u6e90\u6587\u4ef6\u65f6\uff0c\u5982\u679c\u6587\u4ef6\u4e0d\u662fJava\u6e90\u6587\u4ef6\uff08\u5373\uff0c\u5176\u6587\u4ef6\u540d\u4e0d\u4ee5.java\u7ed3\u5c3e\uff09\uff0c\u5e76\u4e14\u5982\u679c\u7b2c\u4e00\u884c\u4ee5#!\u5f00\u5934\uff0c\u5219\u5728\u786e\u5b9a\u8981\u4f20\u9012\u7ed9\u7f16\u8bd1\u5668\u7684\u6e90\u4ee3\u7801\u65f6\uff0c\u5c06\u5ffd\u7565\u8be5\u884c\u7684\u5185\u5bb9\uff0c\u76f4\u5230\u7b2c\u4e00\u4e2a\u6362\u884c\u7b26\u4e4b\u524d\u7684\u5185\u5bb9\u3002<\/p><\/blockquote>\n<p>Shebang \u884c\u4e0d\u4f1a\u88ab\u4f20\u9012\u7ed9\u7f16\u8bd1\u5668\uff0c\u4f1a\u88ab\u5ffd\u7565\u3002Java \u7684\u884c\u6ce8\u91ca\u4e0d\u662f\u7528 #\uff0c\u800c\u662f\u7528 \/\/\uff0c\u901a\u8fc7\u8fd9\u4e2a\u6280\u5de7\u4f7f\u5176\u80fd\u591f\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<p>\u6587\u4ef6\u540d\u4ee5 .java \u7ed3\u5c3e\u65f6\u4f1a\u88ab\u8ba4\u4e3a\u662f Java \u6e90\u6587\u4ef6\uff0c\u5728\u8fd9\u90e8\u5206\u4f1a\u51fa\u73b0\u7f16\u8bd1\u9519\u8bef\u3002\u53ea\u8981\u4e0d\u662f .java \u7ed3\u5c3e\uff0c\u4f8b\u5982 foobar.js \u6216 foobar.sh\uff0c\u90fd\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u3002\u53ef\u607c\u7684\u662f\uff0c\u8fd9\u662f\u65e0\u6cd5\u901a\u8fc7\u6269\u5c55\u540d\u6765\u8868\u793a\u4f7f\u7528\u7684\u8bed\u8a00\u7684\u7279\u6027\u3002\u5982\u679c\u5176\u4ed6\u4eba\u6253\u5f00\u8fd9\u4e2a\u6587\u4ef6\u65f6\uff0c\u4f1a\u60f3\u7740&#8221;\u8fd9\u4e2a\u811a\u672c\u600e\u4e48\u6709bug\u554a\uff1f&#8221;\u7136\u540e\u7adf\u7136\u662f\u4e00\u4e2a Java \u7a0b\u5e8f\uff01\u6211\u76f8\u4fe1\u4ed6\u4eec\u4e00\u5b9a\u4f1a\u5927\u5403\u4e00\u60ca\u7684\u3002<\/p>\n<p>\u5269\u4e0b\u7684\u5c31\u662f\u666e\u901a\u7684Java\u7a0b\u5e8f\u3002main\u65b9\u6cd5\u4e2d\u7684String[] args\u4f1a\u5b8c\u6210\u597d\u5de5\u4f5c\u3002<\/p>\n<h1>1. \u6211\u8bd5\u7740\u521b\u5efa\u4e00\u4e2aShell\u547d\u4ee4\u3002<\/h1>\n<p>\u4f5c\u4e3a\u4e00\u4e2a\u4f8b\u5b50\uff0c\u6211\u521b\u5efa\u4e86\u4e00\u4e2a\u547d\u4ee4\uff0c\u5b83\u4ee5x\u5750\u6807\u548cy\u5750\u6807\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u5b83\u4eec\u6240\u5728\u7684\u7b2c\u51e0\u8c61\u9650\u3002<\/p>\n<p>\u6211\u5011\u8a66\u5716\u901a\u904e\u5728\u7a0b\u5f0f\u8173\u672c\u4e2d\u5ba3\u544a\u4f7f\u7528\u6a5f\u6703\u5f88\u5c11\u7684 var \u4f86\u5c55\u73fe\u8173\u672c\u8a9e\u8a00\u7684\u7279\u8272\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"err\">#<\/span><span class=\"o\">!\/<\/span><span class=\"n\">usr<\/span><span class=\"o\">\/<\/span><span class=\"n\">bin<\/span><span class=\"o\">\/<\/span><span class=\"n\">env<\/span> <span class=\"n\">java<\/span> <span class=\"o\">--<\/span><span class=\"n\">source<\/span> <span class=\"mi\">11<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Quadrant<\/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=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">args<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">2<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n                 <span class=\"kt\">var<\/span> <span class=\"n\">x<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Double<\/span><span class=\"o\">.<\/span><span class=\"na\">parseDouble<\/span><span class=\"o\">(<\/span><span class=\"n\">args<\/span><span class=\"o\">[<\/span><span class=\"mi\">0<\/span><span class=\"o\">]);<\/span>\r\n                 <span class=\"kt\">var<\/span> <span class=\"n\">y<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Double<\/span><span class=\"o\">.<\/span><span class=\"na\">parseDouble<\/span><span class=\"o\">(<\/span><span class=\"n\">args<\/span><span class=\"o\">[<\/span><span class=\"mi\">1<\/span><span class=\"o\">]);<\/span>\r\n                 <span class=\"nc\">String<\/span> <span class=\"n\">s<\/span><span class=\"o\">;<\/span>\r\n                 <span class=\"k\">switch<\/span><span class=\"o\">(<\/span><span class=\"nc\">Coordinate2D<\/span><span class=\"o\">.<\/span><span class=\"na\">quadrantOf<\/span><span class=\"o\">(<\/span><span class=\"n\">x<\/span><span class=\"o\">,<\/span> <span class=\"n\">y<\/span><span class=\"o\">))<\/span> <span class=\"o\">{<\/span>\r\n                     <span class=\"k\">case<\/span> <span class=\"mi\">1<\/span><span class=\"o\">:<\/span>  <span class=\"n\">s<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"1st\"<\/span><span class=\"o\">;<\/span> <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n                     <span class=\"k\">case<\/span> <span class=\"mi\">2<\/span><span class=\"o\">:<\/span>  <span class=\"n\">s<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"2nd\"<\/span><span class=\"o\">;<\/span> <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n                     <span class=\"k\">case<\/span> <span class=\"mi\">3<\/span><span class=\"o\">:<\/span>  <span class=\"n\">s<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"3rd\"<\/span><span class=\"o\">;<\/span> <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n                     <span class=\"k\">case<\/span> <span class=\"mi\">4<\/span><span class=\"o\">:<\/span>  <span class=\"n\">s<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"4th\"<\/span><span class=\"o\">;<\/span> <span class=\"k\">break<\/span><span class=\"o\">;<\/span>\r\n                     <span class=\"k\">default<\/span><span class=\"o\">:<\/span> <span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">IllegalStateException<\/span><span class=\"o\">();<\/span>\r\n                 <span class=\"o\">};<\/span>\r\n                 <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"The quadrant of (\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">x<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\", \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">y<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\") is the \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">s<\/span><span class=\"o\">);<\/span>\r\n                 <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">exit<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span><span class=\"o\">);<\/span>\r\n            <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Exception<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n                 <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">err<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"na\">getMessage<\/span><span class=\"o\">());<\/span>\r\n            <span class=\"o\">}<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"c1\">\/\/ show usage and exit abnormally<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">err<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"usage: quadrant x y\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">err<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"       where x and y are non-zero coordinate values in double\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">exit<\/span><span class=\"o\">(<\/span><span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Coordinate2D<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">quadrantOf<\/span><span class=\"o\">(<\/span><span class=\"kt\">double<\/span> <span class=\"n\">x<\/span><span class=\"o\">,<\/span> <span class=\"kt\">double<\/span> <span class=\"n\">y<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mf\">0.0<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"n\">y<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mf\">0.0<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">else<\/span> <span class=\"nf\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mf\">0.0<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"n\">y<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mf\">0.0<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"mi\">2<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">else<\/span> <span class=\"nf\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mf\">0.0<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"n\">y<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mf\">0.0<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"mi\">3<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">else<\/span> <span class=\"nf\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">x<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mf\">0.0<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"n\">y<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mf\">0.0<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"mi\">4<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"k\">else<\/span>\r\n            <span class=\"k\">throw<\/span> <span class=\"k\">new<\/span> <span class=\"nf\">IllegalArgumentException<\/span><span class=\"o\">(<\/span><span class=\"s\">\"point must not be on any axis\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6700\u8fd1\u6211\u591a\u6570\u4f7f\u7528IntelliJ\uff0c\u4f46\u8fd9\u6b21\u4e3a\u4e86\u4f53\u9a8c\u5199\u811a\u672c\u7684\u611f\u89c9\uff0c\u6211\u4f7f\u7528\u4e86vim\u3002switch\u8bed\u53e5\u7684\u5bc6\u96c6\u63cf\u8ff0\u662f\u56e0\u4e3a\u6ca1\u6709\u4f7f\u7528\u683c\u5f0f\u5316\u5de5\u5177\u3002\u6211\u559c\u6b22switch\u8868\u8fbe\u5f0f\uff0c\u56e0\u4e3a\u5b83\u4e0d\u5bb9\u6613\u51fa\u9519\uff0c\u4f46\u4e3a\u4e86\u4f7f\u811a\u672c\u5177\u6709\u9ad8\u53ef\u79fb\u690d\u6027\uff0c\u6211\u9009\u62e9\u4e86Java 11\uff0c\u5e76\u4e0d\u60c5\u613f\u5730\u7528switch\u8bed\u53e5\u7f16\u5199\u4e86\u811a\u672c\u3002<\/p>\n<p>\u4e5f\u8bb8\u662f\u56e0\u4e3a\u6211\u5bf9Java\u5f88\u719f\u6089\uff0c\u6240\u4ee5\u5199\u9519\u8bef\u5904\u7406\u611f\u89c9\u5f88\u5bb9\u6613\u3002\u53ea\u6709\u6211\u5728Shell\u811a\u672c\u4e2d\u5904\u7406\u9519\u8bef\u603b\u662f\u5306\u5fd9\u9a6c\u864e\u5417\uff1f<\/p>\n<pre class=\"post-pre\"><code>% <span class=\"nb\">chmod<\/span> +x quadrant\r\n% .\/quadrant  \r\nusage: quadrant x y\r\n       where x and y are non-zero coordinate values <span class=\"k\">in <\/span>double\r\n% <span class=\"nb\">echo<\/span> <span class=\"nv\">$?<\/span>\r\n1\r\n% .\/quadrant 2 <span class=\"nt\">-3<\/span>\r\nThe quadrant of <span class=\"o\">(<\/span>2.0, <span class=\"nt\">-3<\/span>.0<span class=\"o\">)<\/span> is the 4th\r\n% <span class=\"nb\">echo<\/span> <span class=\"nv\">$?<\/span>\r\n0\r\n<\/code><\/pre>\n<p>\u4f60\u771f\u7684\u4e0d\u4f1a\u89c9\u5f97\u8fd9\u662f\u7528Java\u7f16\u5199\u7684\uff0c\u53ea\u770b\u5230\u8fd9\u4e9b\u4e1c\u897f\u65f6\u5019\uff0c\u5b9e\u9645\u4e0a\u662f\u8fd9\u6837\u3002<\/p>\n<h1>\u5c1d\u8bd5\u5728 Java \u811a\u672c\u4e2d\u6267\u884c JavaScript<\/h1>\n<p>\u4e0b\u4e00\u6b65\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u4ee4\u4eba\u6000\u5ff5\u7684 Rhino\uff0c\u5728Java\u811a\u672c\u4e2d\u6267\u884cJavaScript\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d0cc037434c4406be986d\/30-0.png\" alt=\"Rhino.png\" \/><\/div>\n<p>https:\/\/github.com\/mozilla\/rhino \u7684 &#8220;JavaScript in Java&#8221; \u8fd9\u4e2a\u4fe1\u606f\u6070\u597d\u7b26\u5408\u6211\u7684\u5fc3\u60c5\u3002<\/p>\n<p>\u8bf4\u5b9e\u8bdd\uff0c\u5728 JDK \u81ea\u5e26\u7684\u65f6\u5019\u6211\u4ece\u672a\u4f7f\u7528\u8fc7 Rhino\u3002\u4eca\u5929\u662f\u6211\u7b2c\u4e00\u6b21\u4f7f\u7528\u5b83\uff0c\u4f46\u5b98\u65b9\u6587\u6863\u8ba9\u6211\u611f\u5230\u56f0\u60d1&#8230;\u3002\u4e0d\u8fc7\uff0c\u6211\u53ea\u662f\u60f3\u901a\u8fc7 Java \u811a\u672c\u6267\u884c JavaScript\uff0c\u4ec5\u6b64\u800c\u5df2\u3002<\/p>\n<p>\u7ecf\u8fc7\u4e00\u756a\u9002\u5f53\u7684\u641c\u7d22\uff0c\u6211\u627e\u5230\u4e86\u4e00\u4e2a\u4f7f\u7528Rhino\u4eceJava\u8c03\u7528\u5916\u90e8JavaScript\u6587\u4ef6\u7684\u7b80\u5355\u793a\u4f8b\uff0c\u8fd9\u4e2a\u793a\u4f8b\u5f88\u5bb9\u6613\u7406\u89e3\u3002\u6240\u4ee5\u6211\u5c06\u5b83\u7b80\u5316\u5e76\u5c06\u5176\u8f6c\u6362\u4e3a\u6267\u884cJavaScript\u7684Java\u811a\u672c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"err\">#<\/span><span class=\"o\">!\/<\/span><span class=\"n\">usr<\/span><span class=\"o\">\/<\/span><span class=\"n\">bin<\/span><span class=\"o\">\/<\/span><span class=\"n\">env<\/span> <span class=\"n\">java<\/span> <span class=\"o\">--<\/span><span class=\"n\">source<\/span> <span class=\"mi\">11<\/span> <span class=\"o\">-<\/span><span class=\"n\">cp<\/span> <span class=\"n\">rhino<\/span><span class=\"o\">-<\/span><span class=\"mf\">1.7<\/span><span class=\"o\">.<\/span><span class=\"mi\">13<\/span><span class=\"o\">.<\/span><span class=\"na\">jar<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">org.mozilla.javascript.Context<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">JavaScriptInJavaScript<\/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=\"kd\">throws<\/span> <span class=\"nc\">Exception<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kt\">var<\/span> <span class=\"n\">ctx<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Context<\/span><span class=\"o\">.<\/span><span class=\"na\">enter<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"kt\">var<\/span> <span class=\"n\">obj<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">evaluateString<\/span><span class=\"o\">(<\/span>\r\n            <span class=\"n\">ctx<\/span><span class=\"o\">.<\/span><span class=\"na\">initStandardObjects<\/span><span class=\"o\">(),<\/span>\r\n            <span class=\"s\">\"'Java' + 'Script'\"<\/span><span class=\"o\">,<\/span>\r\n            <span class=\"s\">\"&lt;Java script&gt;\"<\/span><span class=\"o\">,<\/span>\r\n            <span class=\"mi\">1<\/span><span class=\"o\">,<\/span>\r\n            <span class=\"kc\">null<\/span>\r\n        <span class=\"o\">);<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">obj<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\" in a Java script!\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4f7f\u7528 Shebang \u5728\u7c7b\u8def\u5f84\u4e2d\u6307\u5b9a\u4e86Rhino\u7684jar\u5305\u3002<\/p>\n<pre class=\"post-pre\"><code>% curl <span class=\"nt\">-OsSL<\/span> https:\/\/github.com\/mozilla\/rhino\/releases\/download\/Rhino1_7_13_Release\/rhino-1.7.13.jar \r\n% <span class=\"nb\">chmod<\/span> +x javascript_in_java_script \r\n% .\/javascript_in_java_script \r\nJavaScript <span class=\"k\">in <\/span>a Java script!\r\n<\/code><\/pre>\n<p>\u6211\u53ef\u4ee5\u4eceJava\u811a\u672c\u4e2d\u6267\u884cJavaScript\u5e76\u5f97\u5230&#8217;Java&#8217; + &#8216;Script&#8217;\u8fd9\u4e2a\u7ed3\u679c\u3002<\/p>\n<h1>\u6700\u540e<\/h1>\n<p>\u4f60\u89c9\u5f97\u600e\u4e48\u6837\uff1f\u5d29\u574fJavaScript\u6982\u5ff5\u7684\u8fc7\u7a0b\u6709\u70b9\u6709\u8da3\u3002<\/p>\n<p>\u6211\u4f1a\u5168\u529b\u4ee5\u8d74\uff0c\u8ba4\u771f\u6574\u7406\u3002<\/p>\n<p>Shell\u811a\u672c\u5e38\u5e38\u65e0\u6cd5\u7406\u89e3\u5404\u79cdB Shell\u4e4b\u95f4\u5fae\u5c0f\u7684\u884c\u4e3a\u5dee\u5f02\uff0c\u5f80\u5f80\u53ea\u80fd\u5728bash\u548c\u7279\u5b9a\u7684Linux\u53d1\u884c\u7248\u4e0a\u8fd0\u884c\u3002\u867d\u7136\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u811a\u672c\u8bed\u8a00\u6765\u907f\u514d\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f46\u53e6\u4e00\u65b9\u9762\u4f1a\u7ecf\u5e38\u9762\u4e34\u65e0\u6cd5\u4f7f\u7528perl\u6216python3\u7684\u73af\u5883\u7684\u7f3a\u70b9\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a\uff0c\u5728\u4ee5Java 11\u6216\u66f4\u9ad8\u7248\u672c\u5f00\u53d1\u7684\u9879\u76ee\u4e2d\uff0c\u6709\u80fd\u529b\u8fd0\u884cJava\u811a\u672c\u7684JDK\u7684\u4e24\u4e2aJava\u547d\u4ee4\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a\u9759\u6001\u7c7b\u578b\u3001\u4fbf\u4e8e\u786e\u4fddJava\u7a0b\u5e8f\u5458\u7684\u53ef\u79fb\u690d\u6027\u7b49\u3002\u56e0\u6b64\uff0c\u6211\u8ba4\u4e3a\u5b83\u4eec\u662f\u4f5c\u4e3a\u811a\u672c\u8bed\u8a00\u7684\u9009\u62e9\u7684\u4e00\u4e2a\u503c\u5f97\u8003\u8651\u7684\u5019\u9009\u9879\u3002<\/p>\n<p>\u6211\u53ef\u80fd\u9084\u6c92\u6709\u8db3\u5920\u7684\u52c7\u6c23\u5728\u5be6\u52d9\u4e2d\u4f7f\u7528\u5b83\uff0c\u4f46\u5c0d\u65bc\u8b80\u8005\u5011\u4f86\u8aaa\uff0c\u6311\u6230\u4e00\u4e0b\u300c\u4e00\u6b21\u7de8\u5beb\uff0c\u5230\u8655\u904b\u884c\u300d\u7684Java\u8173\u672c\u4e5f\u662f\u5f88\u6709\u8da3\u7684\u5427\u3002\u671f\u5f85\u60a8\u7684\u5831\u544a\u3002<\/p>\n<p>\u548c\u4f60\u4e00\u8d77\u4f7f\u7528JavaScript\uff0c\u7acb\u523b\u8fd0\u884c\u3002<\/p>\n<div>\n<p>\u8bf7\u4f7f\u7528#!\/usr\/bin\/env node\u6307\u5b9a\u8fd9\u662f\u4e00\u4e2a\u201cJavaScript\u811a\u672c\u201d\u3002 \u6211\u53ef\u4ee5\u63a5\u53d7\u5f02\u8bae\u3002 \u21a9<\/p>\n<p>GraalVM\u4e0d\u53d7\u652f\u6301\u3002 \u21a9<\/p>\n<p>\u4ec5\u9650\u4e8e\u89e3\u91caShebang\u7684\u73af\u5883\u3002 \u21a9<\/p>\n<p>\u8bf7\u4f7f\u7528\u60a8\u559c\u6b22\u7684\u6587\u4ef6\u6269\u5c55\u540d\u3002 \u21a9<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u5c0d\u65bc\u6b63\u5728\u5c0b\u627eJavaScript\u76f8\u95dc\u6587\u7ae0\u7684\u5927\u5bb6\uff0c\u5f88\u62b1\u6b49\u672c\u5167\u5bb9\u53ef\u80fd\u7121\u6cd5\u70ba\u60a8\u63d0\u4f9b\u5e6b\u52a9\uff0c\u8acb\u6309\u700f\u89bd\u5668\u7684\u8fd4\u56de\u6309\u9215\u3002 \u6b64\u5916 [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31474","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u8fd9\u662fJava\u811a\u672c\u5417\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u8fd9\u662fjava\u811a\u672c\u5417\uff1f\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u8fd9\u662fJava\u811a\u672c\u5417\uff1f\" \/>\n<meta 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