{"id":201,"date":"2023-05-04T23:09:29","date_gmt":"2023-11-04T11:00:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/scala%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e4%b8%8e%e7%ad%94%e6%a1%88\/"},"modified":"2025-08-01T02:17:58","modified_gmt":"2025-07-31T18:17:58","slug":"scala%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e4%b8%8e%e7%ad%94%e6%a1%88","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/scala%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98%e4%b8%8e%e7%ad%94%e6%a1%88\/","title":{"rendered":"Scala\u9762\u8bd5\u7cbe\u9009\uff1a\u5e38\u89c1\u95ee\u9898\u4e0e\u9ad8\u5206\u7b54\u6848\u89e3\u6790"},"content":{"rendered":"<p><!-- \u8fd9\u662f\u6587\u7ae0\u300aScala\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51714\u90e8\u5206\uff09\u3002 --><\/p>\n<p>\u6b22\u8fce\u8bbf\u95ee<strong>Scala\u9762\u8bd5\u9898\u4e0e\u7b54\u6848<\/strong>\u3002\u5982\u4eca\uff0c\u5927\u591a\u6570\u91d1\u878d\/\u94f6\u884c\u3001\u653f\u5e9c\u3001\u7535\u4fe1\u548c\u793e\u4ea4\u7f51\u7edc\u7b49\u516c\u53f8\u90fd\u5728\u4f7f\u7528Scala\u3001Play\u548cAkka\u6846\u67b6\u6765\u5f00\u53d1\u4ed6\u4eec\u7684\u9879\u76ee\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u6846\u67b6\u65e2\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09\u53c8\u652f\u6301\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08FP\uff09\uff0c\u5e76\u63d0\u4f9b\u4e86\u8bb8\u591a\u4f18\u52bf\u3002<\/p>\n<h2>Scala\u9762\u8bd5\u95ee\u9898\uff1a\u5168\u6808\u5f00\u53d1\u8005\u5fc5\u5907\u6307\u5357<\/h2>\n<p>\u6211\u6253\u7b97\u901a\u8fc7\u51e0\u7bc7\u6587\u7ae0\u4e0e\u4f60\u5206\u4eab\u6211\u7684\u9762\u8bd5\u7ecf\u9a8c\u4ee5\u53ca\u5173\u4e8eScala\u751f\u6001\u7cfb\u7edf\u6216\u5168\u6808Scala\uff08Scala\/Play\/Akka\uff09\u5f00\u53d1\u7684\u7ecf\u9a8c\u3002\u6211\u5c06\u4f1a\u5206\u4eab\u7ed9\u4f603\u7bc7\u72ec\u7acb\u7684\u6587\u7ae0\u3002\u6709\u4e9b\u95ee\u9898\u53ea\u662f\u4e00\u4e2a\u95ee\u9898\uff0c\u800c\u6709\u4e9b\u95ee\u9898\u8fd8\u6709\u4e00\u4e9b\u5b50\u95ee\u9898\u3002\u603b\u5171\u6211\u5c06\u4f1a\u8ba8\u8bba\u5927\u7ea6200\u4e2a\u95ee\u9898\u3002\u6211\u6562\u6253\u8d4c\uff0c\u5982\u679c\u4f60\u719f\u6089\u6240\u6709\u8fd9\u4e9b\u95ee\u9898\uff0c\u4f60\u80af\u5b9a\u53ef\u4ee5\u987a\u5229\u901a\u8fc7\u6240\u6709Scala\u5f00\u53d1\u8005\u7684\u9762\u8bd5\u3002\u7136\u800c\uff0c\u5982\u679c\u4f60\u60f3\u7ee7\u7eed\u4f5c\u4e3a\u4e00\u4e2a\u5168\u6808Scala\u5f00\u53d1\u8005\uff0c\u4f60\u5e94\u8be5\u5145\u5206\u4e86\u89e3\u6240\u6709\u8fd9\u4e9b\u5168\u6808Scala\u6280\u672f\u3002<\/p>\n<h3>\u4ecb\u7ecd<\/h3>\n<p>\u6211\u5c06\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206\u63d0\u4f9bScala\/Play\/Akka\u7684\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848\uff1a<\/p>\n<ol>\n<li><strong>Scala\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848\uff08\u57fa\u7840\u7bc7\uff09<\/strong>\uff1a\n<p>\u5728\u8fd9\u91cc\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u57fa\u672c\u7684Scala\u9762\u8bd5\u95ee\u9898\uff0c\u5bf9\u4e8e\u60f3\u8981\u8f6c\u5411Scala\u5f00\u53d1\u6216\u8005\u67091\u5e74\u4ee5\u4e0aScala\u5f00\u53d1\u7ecf\u9a8c\u7684\u521d\u7ea7\u6216\u8005Java\u5f00\u53d1\u8005\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/li>\n<li><strong>Scala\u4e2d\u7ea7\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848<\/strong>\uff1a\n<p>\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u9762\u8bd5\u95ee\u9898\uff0c\u5bf9\u4e8e\u67092\u5e74\u4ee5\u4e0aScala\/Java\u5f00\u53d1\u7ecf\u9a8c\u7684\u5f00\u53d1\u8005\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/li>\n<li><strong>Scala\u9ad8\u7ea7\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848<\/strong>\uff1a\n<p>\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u9762\u8bd5\u95ee\u9898\uff0c\u5bf9\u4e8e\u6709\u9ad8\u7ea7\u6216\u8005\u6709\u7ecf\u9a8c\u7684Scala\/Java\u5f00\u53d1\u8005\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/li>\n<li><strong>Scala\/Java\u5e76\u53d1\u548c\u5e76\u884c\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848<\/strong>\uff1a\n<p>\u6211\u4eec\u5c06\u8ba8\u8bbaScala\/Java\u5e76\u53d1\u548c\u5e76\u884c\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848\uff0c\u5bf9\u4e8e\u6709\u9ad8\u7ea7\u6216\u8005\u6709\u7ecf\u9a8c\u7684Scala\/Java\u5f00\u53d1\u8005\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u6211\u4eec\u8fd8\u5c06\u8ba8\u8bba\u4e00\u4e0bScala\u548cJava\u7ed3\u6784\u4e4b\u95f4\u7684\u4e00\u4e9b\u5dee\u5f02\uff0c\u4ee5\u4fbf\u90a3\u4e9b\u4eceJava\u8fc7\u6e21\u5230Scala\u7684\u7528\u6237\u4ece\u8fd9\u4e9b\u6587\u7ae0\u4e2d\u83b7\u76ca\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u57fa\u672c\u7684Scala\u9762\u8bd5\u95ee\u9898\u3002\u8bf7\u9605\u8bfb\u6211\u540e\u9762\u7684\u6587\u7ae0\u4e86\u89e3\u5269\u4e0b\u7684\u4e24\u4e2a\u90e8\u5206\u3002<\/p>\n<h3>Scala\u57fa\u7840\u9762\u8bd5\u95ee\u9898\u5217\u8868<\/h3>\n<p>\u5728\u8fd9\u4e00\u90e8\u5206\uff0c\u6211\u4eec\u5c06\u5217\u51fa\u6240\u6709\u7684Scala\u57fa\u7840\u9762\u8bd5\u95ee\u9898\uff0c\u800c\u5728\u4e0b\u4e00\u90e8\u5206\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bba\u5b83\u4eec\u3002<\/p>\n<ol>\n<li>\u4ec0\u4e48\u662fScala\uff1f\u5b83\u662f\u4e00\u79cd\u8bed\u8a00\u8fd8\u662f\u5e73\u53f0\uff1f\u5b83\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09\u8fd8\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08FP\uff09\uff1f\u8c01\u662fScala\u7684\u521b\u59cb\u4eba\uff1f<\/li>\n<li>Scala\u662f\u4e00\u79cd\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u5417\uff1f\u4ec0\u4e48\u662f\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u548c\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\uff1f\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u548c\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Scala\u662f\u4e00\u79cd\u7eaf\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\u5417\uff1fJava\u662f\u4e00\u79cd\u7eaf\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\u5417\uff1f<\/li>\n<li>Scala\u652f\u6301\u6240\u6709\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u6982\u5ff5\u5417\uff1fJava 8\u662f\u5426\u652f\u6301\u6240\u6709\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u6982\u5ff5\uff1f<\/li>\n<li>Scala\u8bed\u8a00\u7684\u4e3b\u8981\u4f18\u52bf\u662f\u4ec0\u4e48\uff1fScala\u8bed\u8a00\u6709\u4ec0\u4e48\u7f3a\u70b9\u5417\uff1f<\/li>\n<li>Scala\u8bed\u8a00\u7684\u4e3b\u8981\u7f3a\u70b9\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u8bed\u8a00\u7684\u4e3b\u8981\u76ee\u6807\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>\u76ee\u524d\u6709\u54ea\u4e9b\u53d7\u6b22\u8fce\u7684JVM\u8bed\u8a00\uff1f<\/li>\n<li>\u4e0eJava\u7684<code>java.lang.Object<\/code>\u7c7b\u7c7b\u4f3c\uff0cScala\u4e2d\u6240\u6709\u7c7b\u7684\u8d85\u7c7b\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u4e2d\u7684\u9ed8\u8ba4\u8bbf\u95ee\u4fee\u9970\u7b26\u662f\u4ec0\u4e48\uff1fScala\u6709\u201cpublic\u201d\u5173\u952e\u5b57\u5417\uff1f<\/li>\n<li>Scala\u4e2d\u7684\u201c\u7c7b\u578b\u63a8\u65ad\u201d\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u7684<code>Int<\/code>\u548cJava\u7684<code>java.lang.Integer<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<code>Int<\/code>\u548c<code>RichInt<\/code>\u5728Scala\u4e2d\u7684\u5173\u7cfb\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u4e2d\u7684<code>Nothing<\/code>\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684<code>Nil<\/code>\u662f\u4ec0\u4e48\uff1f<code>Nothing<\/code>\u548c<code>Nil<\/code>\u5728Scala\u4e2d\u7684\u5173\u7cfb\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u4e2d\u7684<code>Null<\/code>\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684<code>null<\/code>\u662f\u4ec0\u4e48\uff1f<code>Null<\/code>\u548c<code>null<\/code>\u5728Scala\u4e2d\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u4e2d\u7684<code>Unit<\/code>\u662f\u4ec0\u4e48\uff1fJava\u7684<code>void<\/code>\u548cScala\u7684<code>Unit<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Scala\u4e2d\u7684<code>val<\/code>\u548c<code>var<\/code>\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Scala\u4e2d\u7684REPL\u662f\u4ec0\u4e48\uff1fScala\u7684REPL\u6709\u4ec0\u4e48\u7528\u9014\uff1f\u5982\u4f55\u4eceCMD\u63d0\u793a\u7b26\u8bbf\u95eeScala\u7684REPL\uff1f<\/li>\n<li>Scala\u6709\u54ea\u4e9b\u7279\u6027\uff1f<\/li>\n<li>\u6211\u4eec\u5982\u4f55\u4f7f\u7528\u51fd\u6570\u5f0f\u5b9e\u73b0\u5faa\u73af\uff1f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u98ce\u683c\u7684\u5faa\u73af\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Scala\u4e2d\u7684\u201cApplication\u201d\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684\u201cApp\u201d\u662f\u4ec0\u4e48\uff1fScala\u7684App\u6709\u4ec0\u4e48\u7528\u9014\uff1f<\/li>\n<li>Scala\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5417\uff1fJava\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5417\uff1f<\/li>\n<li>\u4ec0\u4e48\u662f\u8868\u8fbe\u5f0f\uff1f\u4ec0\u4e48\u662f\u8bed\u53e5\uff1f\u8868\u8fbe\u5f0f\u548c\u8bed\u53e5\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Java\u7684\u201cif\u2026else\u201d\u548cScala\u7684\u201cif\u2026else\u201d\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Scala\u662f\u4e00\u79cd\u57fa\u4e8e\u8868\u8fbe\u5f0f\u7684\u8bed\u8a00\u8fd8\u662f\u57fa\u4e8e\u8bed\u53e5\u7684\u8bed\u8a00\uff1fJava\u662f\u4e00\u79cd\u57fa\u4e8e\u8868\u8fbe\u5f0f\u7684\u8bed\u8a00\u8fd8\u662f\u57fa\u4e8e\u8bed\u53e5\u7684\u8bed\u8a00\uff1f<\/li>\n<li>\u544a\u8bc9\u6211\u4e00\u4e9bJava\u652f\u6301\u4f46Scala\u4e0d\u652f\u6301\u7684\u529f\u80fd\uff0c\u4ee5\u53ca\u53cd\u8fc7\u6765\u3002<\/li>\n<li>\u51fd\u6570\u548c\u65b9\u6cd5\u5728Scala\u4e2d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>\u5728Scala\u6e90\u6587\u4ef6\u4e2d\u53ef\u4ee5\u5b9a\u4e49\u591a\u5c11\u4e2a\u516c\u5171\u7c7b\u6587\u4ef6\uff1f<\/li>\n<li>\u4e0eJava\u7c7b\u4f3c\uff0cScala\u8bed\u8a00\u6709\u54ea\u4e9b\u9ed8\u8ba4\u5bfc\u5165\uff1f<\/li>\n<li>Scala\u4e2d\u6709\u591a\u5c11\u4e2a\u8fd0\u7b97\u7b26\u4ee5\u53ca\u4e3a\u4ec0\u4e48\uff1f<\/li>\n<li>\u63d0\u53ca\u4e00\u4e9bJava\u4e2d\u4f7f\u7528\u4f46Scala\u4e0d\u9700\u8981\u7684\u5173\u952e\u5b57\u3002\u4e3a\u4ec0\u4e48Scala\u4e0d\u9700\u8981\u5b83\u4eec\uff1f<\/li>\n<li>Scala\u4e2d\u7684<code>PreDef<\/code>\u662f\u4ec0\u4e48\uff1f<\/li>\n<\/ol>\n<p>\u8bf7\u53c2\u8003\u6211\u4e4b\u524d\u7684\u5e16\u5b50\u4e86\u89e3\u66f4\u591a\u6709\u5173\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u5185\u5bb9\uff08<a href=\"#\">\u70b9\u51fb\u6b64\u94fe\u63a5\u4ee5\u6253\u5f00\u6211\u4e4b\u524d\u7684\u5e16\u5b50<\/a>\uff09\u3002<\/p>\n<h3>Scala\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848\uff08\u8be6\u7ec6\u89e3\u6790\uff09<\/h3>\n<p>\u5728\u8fd9\u4e00\u90e8\u5206\u4e2d\uff0c\u6211\u4eec\u5c06\u4ece\u4e0a\u9762\u7684\u5217\u8868\u4e2d\u6311\u9009\u51fa\u6bcf\u4e00\u4e2a\u95ee\u9898\uff0c\u5e76\u901a\u8fc7\u9002\u5f53\u7684\u4f8b\u5b50\u8fdb\u884c\u8be6\u7ec6\u8ba8\u8bba\uff08\u5982\u679c\u9700\u8981\uff09\u3002\u5982\u679c\u60a8\u60f3\u6df1\u5165\u4e86\u89e3\u8fd9\u4e9b\u6982\u5ff5\u5e76\u901a\u8fc7\u4f8b\u5b50\u52a0\u4ee5\u7406\u89e3\uff0c\u8bf7\u9605\u8bfb\u6211\u5728Scala\u6559\u7a0b\u90e8\u5206\u4e4b\u524d\u7684\u5e16\u5b50\u3002<\/p>\n<h4>1. \u4ec0\u4e48\u662fScala\uff1f\u5b83\u662f\u4e00\u79cd\u8bed\u8a00\u8fd8\u662f\u5e73\u53f0\uff1f\u5b83\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8fd8\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\uff1f\u8c01\u662fScala\u7684\u521b\u59cb\u4eba\uff1f<\/h4>\n<p>Scala\u4ee3\u8868<strong>\u53ef\u6269\u5c55\u8bed\u8a00\uff08Scalable Language\uff09<\/strong>\u3002<strong>Martin Odersky<\/strong>\u662fScala\u7684\u521b\u59cb\u4eba\u3002Scala\u662f\u4e00\u79cd\u652f\u6301\u9762\u5411\u5bf9\u8c61\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u6982\u5ff5\u7684<strong>\u591a\u8303\u5f0f\u7f16\u7a0b\u8bed\u8a00<\/strong>\u3002\u5b83\u662f\u7531Martin Odersky\u8bbe\u8ba1\u548c\u5f00\u53d1\u7684\u3002Scala\u662f\u4e00\u79cd\u7c7b\u578b\u5b89\u5168\u7684\u9762\u5411\u5bf9\u8c61\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684JVM\u8bed\u8a00\u3002Scala\u8fd0\u884c\u5728JVM\uff08Java\u865a\u62df\u673a\uff09\u4e0a\u3002Scala\u662f\u4e00\u79cd\u6df7\u5408\u7684\u51fd\u6570\u5f0f\uff08\u9762\u5411\u5bf9\u8c61\u548c\u51fd\u6570\u5f0f\uff09\u7f16\u7a0bJVM\u8bed\u8a00\u3002Scala\u62e5\u6709\u5f3a\u5927\u4e14\u9759\u6001\u7684\u7c7b\u578b\u7cfb\u7edf\u3002\u5728Scala\u4e2d\uff0c\u6240\u6709\u7c7b\u578b\u5728\u7f16\u8bd1\u65f6\u90fd\u4f1a\u8fdb\u884c\u68c0\u67e5\u3002<\/p>\n<h4>2. Scala\u662f\u4e00\u79cd\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u5417\uff1f\u4ec0\u4e48\u662f\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u548c\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\uff1f\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u548c\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h4>\n<h2>Scala\u662f\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u5417\uff1f<\/h2>\n<p>\u662f\u7684\uff0cScala\u662f\u4e00\u79cd\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u3002\u9759\u6001\u7c7b\u578b\u8bed\u8a00\u610f\u5473\u7740\u7c7b\u578b\u68c0\u67e5\u7531\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\uff0c\u800c\u4e0d\u662f\u5728\u8fd0\u884c\u65f6\u8fdb\u884c\u3002\u8fd9\u79cd\u8bed\u8a00\u7684\u4e3b\u8981\u4f18\u70b9\u662f\uff1a\u4f5c\u4e3a\u5f00\u53d1\u4eba\u5458\uff0c\u6211\u4eec\u5e94\u8be5\u5173\u6ce8\u7f16\u5199\u6b63\u786e\u7684\u4ee3\u7801\uff0c\u4ee5\u907f\u514d\u6240\u6709\u7f16\u8bd1\u65f6\u9519\u8bef\u3002\u7531\u4e8e\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u68c0\u67e5\u4e86\u8bb8\u591a\u9519\u8bef\uff0c\u6211\u4eec\u5728\u8fd0\u884c\u65f6\u4e0d\u4f1a\u9047\u5230\u5f88\u591a\u95ee\u9898\u6216\u9519\u8bef\u3002\u4f8b\u5982\uff1aJava\u3001Scala\u3001C\u3001C++\u3001Haskell\u7b49\u3002<\/p>\n<p>\u52a8\u6001\u7c7b\u578b\u8bed\u8a00\u610f\u5473\u7740\u7c7b\u578b\u68c0\u67e5\u662f\u5728\u8fd0\u884c\u65f6\u8fdb\u884c\u7684\uff0c\u800c\u4e0d\u662f\u7531\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\u7684\u3002\u7531\u4e8e\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u4e0d\u4f1a\u8fdb\u884c\u4efb\u4f55\u7c7b\u578b\u68c0\u67e5\uff0c\u6211\u4eec\u53ef\u4ee5\u9884\u671f\u4f1a\u6709\u66f4\u591a\u7684\u8fd0\u884c\u65f6\u95ee\u9898\u6216\u9519\u8bef\u3002\u4f8b\u5982\uff1aGroovy\u3001JavaScript\u3001Ruby\u3001Python\u3001Smalltalk\u7b49\u3002<\/p>\n<h2>Scala\u662f\u7eaf\u9762\u5411\u5bf9\u8c61\u8bed\u8a00\u5417\uff1fJava\u662f\u7eaf\u9762\u5411\u5bf9\u8c61\u8bed\u8a00\u5417\uff1f<\/h2>\n<p>\u7eaf\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\u610f\u5473\u7740\u4e00\u5207\u90fd\u5e94\u8be5\u662f\u5bf9\u8c61\u3002Java\u4e0d\u662f\u7eaf\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09\u8bed\u8a00\uff0c\u56e0\u4e3a\u5b83\u652f\u6301\u4ee5\u4e0b\u4e24\u4e2a\u975e\u9762\u5411\u5bf9\u8c61\u7684\u6982\u5ff5\uff1a<\/p>\n<ul>\n<li>Java\u652f\u6301\u539f\u59cb\u6570\u636e\u7c7b\u578b\u3002\u5b83\u4eec\u4e0d\u662f\u5bf9\u8c61\u3002<\/li>\n<li>Java\u652f\u6301\u9759\u6001\u6210\u5458\u3002\u5b83\u4eec\u4e0e\u5bf9\u8c61\u65e0\u5173\u3002<\/li>\n<\/ul>\n<p>\u662f\u7684\uff0c\u5728Scala\u4e2d\uff0c\u4e00\u5207\u90fd\u662f\u5bf9\u8c61\uff0c\u4e00\u5207\u90fd\u662f\u503c\uff0c\u56e0\u6b64\u5b83\u662f\u4e00\u95e8\u7eaf\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u51fd\u6570\u662f\u503c\uff0c\u503c\u662f\u5bf9\u8c61\u3002Scala\u6ca1\u6709\u539f\u59cb\u6570\u636e\u7c7b\u578b\uff0c\u4e5f\u6ca1\u6709\u9759\u6001\u6210\u5458\u3002<\/p>\n<h2>Scala\u662f\u5426\u652f\u6301\u6240\u6709\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u6982\u5ff5\uff1fJava 8\u662f\u5426\u652f\u6301\u6240\u6709\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u6982\u5ff5\uff1f<\/h2>\n<p>\u662f\u7684\uff0cScala\u652f\u6301\u6240\u6709\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08FP\uff09\u7684\u6982\u5ff5\u3002Java 8\u5f15\u5165\u4e86\u4e00\u4e9b\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u7ed3\u6784\uff0c\u4f46\u4e0d\u652f\u6301\u6240\u6709\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u6982\u5ff5\uff0c\u4f8b\u5982\uff0cJava 8\u4e0d\u652f\u6301\u6a21\u5f0f\u5339\u914d\u3001\u51fd\u6570\u67ef\u91cc\u5316\u3001\u9690\u5f0f\u7b49\u3002<\/p>\n<h2>Scala\u8bed\u8a00\u6709\u54ea\u4e9b\u4e3b\u8981\u4f18\u52bf\u548c\u4e0d\u8db3\u4e4b\u5904\uff1f<\/h2>\n<p>\u5982\u679c\u6211\u4eec\u4f7f\u7528Scala\u8bed\u8a00\u6765\u5f00\u53d1\u5e94\u7528\u7a0b\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u5f97\u4ee5\u4e0b\u4f18\u70b9\u548c\u52a3\u52bf\uff1a<\/p>\n<h3>Scala\u8bed\u8a00\u7684\u4f18\u70b9\uff1a<\/h3>\n<ul>\n<li>\u4ee3\u7801\u7b80\u6d01<\/li>\n<li>\u8868\u8fbe\u529b\u5f3a<\/li>\n<li>\u4ee3\u7801\u53ef\u8bfb\u6027\u9ad8<\/li>\n<li>100%\u7c7b\u578b\u5b89\u5168<\/li>\n<li>\u4e0d\u53ef\u53d8\u6027\u548c\u65e0\u526f\u4f5c\u7528<\/li>\n<li>\u4ee3\u7801\u53ef\u91cd\u7528\u6027\u9ad8<\/li>\n<li>\u6a21\u5757\u5316\u7a0b\u5ea6\u9ad8<\/li>\n<li>\u7528\u66f4\u5c11\u7684\u4ee3\u7801\u505a\u66f4\u591a\u7684\u4e8b<\/li>\n<li>\u8bed\u6cd5\u975e\u5e38\u7075\u6d3b<\/li>\n<li>\u652f\u6301\u6240\u6709\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7279\u6027<\/li>\n<li>\u652f\u6301\u6240\u6709\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\uff0c\u9ad8\u5ea6\u51fd\u6570\u5316<\/li>\n<li>\u4ee3\u7801\u4e0d\u6613\u51fa\u9519<\/li>\n<li>\u66f4\u597d\u7684\u5e76\u884c\u548c\u5e76\u53d1\u7f16\u7a0b<\/li>\n<li>\u9ad8\u5ea6\u53ef\u4f38\u7f29\u548c\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801<\/li>\n<li>\u751f\u4ea7\u529b\u9ad8<\/li>\n<li>\u652f\u6301\u5206\u5e03\u5f0f\u5e94\u7528<\/li>\n<li>\u4e0eJava\u5b8c\u5168\u4e92\u64cd\u4f5c<\/li>\n<li>\u63d0\u4f9b\u5f3a\u5927\u7684Scala DSLs<\/li>\n<li>\u63d0\u4f9bREPL\u7528\u4e8e\u5b66\u4e60Scala\u57fa\u7840\u77e5\u8bc6<\/li>\n<\/ul>\n<h3>Scala\u8bed\u8a00\u7684\u7f3a\u70b9\uff1a<\/h3>\n<ul>\n<li>\u4ee3\u7801\u53ef\u8bfb\u6027\u8f83\u4f4e\uff08\u6709\u65f6\uff09<\/li>\n<li>\u521d\u5b66\u8005\u7406\u89e3\u4ee3\u7801\u53ef\u80fd\u8f83\u96be<\/li>\n<li>\u5b66\u4e60\u8bed\u6cd5\u590d\u6742<\/li>\n<li>\u5411\u540e\u517c\u5bb9\u6027\u8f83\u5dee<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u6211\u4eec\u53ef\u4ee5\u4ee5\u66f4\u53ef\u8bfb\u6216\u4e0d\u592a\u53ef\u8bfb\u7684\u65b9\u5f0f\u7f16\u5199Scala\u4ee3\u7801\u3002<\/p>\n<h2>Scala\u8bed\u8a00\u7684\u4e3b\u8981\u7f3a\u70b9\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u9664\u4e86Scala\u7684\u8bb8\u591a\u4f18\u70b9\u4e4b\u5916\uff0c\u5b83\u8fd8\u6709\u4e00\u4e2a\u4e3b\u8981\u7684\u7f3a\u70b9\uff1a\u5411\u540e\u517c\u5bb9\u6027\u95ee\u9898\u3002\u5982\u679c\u6211\u4eec\u60f3\u8981\u5347\u7ea7\u5230\u6700\u65b0\u7248\u672c\u7684Scala\uff0c\u90a3\u4e48\u6211\u4eec\u9700\u8981\u6ce8\u610f\u66f4\u6539\u4e00\u4e9b\u5305\u540d\u3001\u7c7b\u540d\u3001\u65b9\u6cd5\u6216\u51fd\u6570\u540d\u7b49\u7b49\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6b63\u5728\u4f7f\u7528\u65e7\u7248Scala\u5e76\u4e14\u60a8\u7684\u9879\u76ee\u4f7f\u7528<code>BeanProperty<\/code>\u6ce8\u89e3\u3002\u5728\u65e7\u7248\u672c\u4e2d\uff0c\u5b83\u5728<code>\"scala.reflect\"<\/code>\u4e2d\u662f\u53ef\u7528\u7684\uff0c\u5982<code>\"scala.reflect.BeanProperty\"<\/code>\u3002\u5982\u679c\u6211\u4eec\u60f3\u8981\u5347\u7ea7\u5230\u65b0\u7684Scala\u7248\u672c\uff0c\u90a3\u4e48\u6211\u4eec\u9700\u8981\u5c06\u8fd9\u4e2a\u5305\u4ece<code>\"scala.reflect\"<\/code>\u6539\u4e3a<code>\"scala.beans\"<\/code>\u3002<\/p>\n<h2>Scala\u8bed\u8a00\u7684\u4e3b\u8981\u5ea7\u53f3\u94ed\u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>\u4e0eJava\u7684\u5ea7\u53f3\u94ed\u201c\u4e00\u6b21\u7f16\u5199\uff0c\u5230\u5904\u8fd0\u884c\u201d\u4e0d\u540c\uff0cScala\u6709\u201c\u7528\u66f4\u5c11\u505a\u66f4\u591a\u201d\u6216\u201c\u7528\u66f4\u5c11\u7684\u4ee3\u7801\u505a\u66f4\u591a\u201d\u7684\u5ea7\u53f3\u94ed\u3002\u201c\u7528\u66f4\u5c11\u505a\u66f4\u591a\u201d\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u7528\u66f4\u5c11\u7684\u4ee3\u7801\u5f00\u53d1\u66f4\u590d\u6742\u7684\u7a0b\u5e8f\u6216\u903b\u8f91\u3002<\/p>\n<h2>\u73b0\u5728\u6709\u54ea\u4e9b\u6d41\u884c\u7684JVM\u8bed\u8a00\uff1f<\/h2>\n<p>Java\u3001Scala\u3001Groovy\u548cClojure\u662f\u6700\u53d7\u6b22\u8fce\u7684JVM\uff08Java\u865a\u62df\u673a\uff09\u8bed\u8a00\u3002Scala\u3001Groovy\u548cClojure JVM\u8bed\u8a00\u90fd\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7279\u6027\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\u3002Java SE 8\u652f\u6301\u6240\u6709\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7279\u6027\u3002\u7136\u800c\uff0c\u5b83\u53ea\u652f\u6301\u5f88\u5c11\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u7279\u6027\uff0c\u6bd4\u5982Lambda\u8868\u8fbe\u5f0f\u3001\u51fd\u6570\u3001\u7c7b\u578b\u63a8\u65ad\u548c\u9ad8\u9636\u51fd\u6570\u3002<\/p>\n<h2>\u5728Scala\u4e2d\uff0c\u6240\u6709\u7c7b\u7684\u8d85\u7c7b\u662f\u4ec0\u4e48\uff0c\u5c31\u50cfJava\u7684<code>java.lang.Object<\/code>\u7c7b\u4e00\u6837\uff1f<\/h2>\n<p>\u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0c\u5728Java\u4e2d\uff0c\u6240\u6709\u7c7b\uff08\u5305\u62ecJava API\u7c7b\u6216\u7528\u6237\u5b9a\u4e49\u7c7b\uff09\u7684\u7236\u7c7b\u662f<code>java.lang.Object<\/code>\u3002\u540c\u6837\u5730\uff0c\u5728Scala\u4e2d\uff0c\u6240\u6709\u7c7b\u6216\u7279\u8d28\u7684\u7236\u7c7b\u662f<code>\u201cAny\u201d<\/code>\u7c7b\u3002<code>Any<\/code>\u7c7b\u5728<code>scala<\/code>\u5305\u4e2d\u5b9a\u4e49\uff0c\u7c7b\u4f3c\u4e8e<code>\u201cscala.Any\u201d<\/code>\u3002<\/p>\n<h2>\u5728Scala\u4e2d\uff0c\u9ed8\u8ba4\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u662f\u5426\u6709<code>\u201cpublic\u201d<\/code>\u5173\u952e\u5b57\uff1f<\/h2>\n<p>\u5728Scala\u4e2d\uff0c\u5982\u679c\u6211\u4eec\u4e0d\u7ed9\u65b9\u6cd5\u3001\u51fd\u6570\u3001\u7279\u5f81\u3001\u5bf9\u8c61\u6216\u7c7b\u6307\u5b9a\u8bbf\u95ee\u4fee\u9970\u7b26\uff0c\u90a3\u4e48\u9ed8\u8ba4\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\u662f<code>\"public\"<\/code>\u3002\u751a\u81f3\u5bf9\u4e8e\u5b57\u6bb5\u6765\u8bf4\uff0c<code>\"public\"<\/code>\u4e5f\u662f\u9ed8\u8ba4\u7684\u8bbf\u95ee\u4fee\u9970\u7b26\u3002\u7531\u4e8e\u8fd9\u4e2a\u9ed8\u8ba4\u7279\u6027\uff0cScala\u4e2d\u6ca1\u6709<code>\"public\"<\/code>\u5173\u952e\u5b57\u3002<\/p>\n<h2>\u5728Scala\u4e2d\uff0c<code>\u201c\u7c7b\u578b\u63a8\u65ad\u201d<\/code>\u662f\u4ec0\u4e48\u610f\u601d\uff1f<\/h2>\n<p>\u5728Scala\u7f16\u8bd1\u5668\u4e2d\uff0c\u7c7b\u578b\u53ef\u4ee5\u5728\u7f16\u8bd1\u65f6\u8fdb\u884c\u63a8\u65ad\uff0c\u8fd9\u88ab\u79f0\u4e3a<code>\u201c\u7c7b\u578b\u63a8\u65ad\u201d<\/code>\u3002\u7c7b\u578b\u6307\u7684\u662f\u6570\u636e\u7c7b\u578b\u6216\u7ed3\u679c\u7c7b\u578b\u3002\u6211\u4eec\u5728Scala\u7a0b\u5e8f\u4e2d\u7684\u8bb8\u591a\u5730\u65b9\u4f7f\u7528\u7c7b\u578b\uff0c\u5982\u53d8\u91cf\u7c7b\u578b\uff0c\u5bf9\u8c61\u7c7b\u578b\uff0c\u65b9\u6cd5\/\u51fd\u6570\u53c2\u6570\u7c7b\u578b\uff0c\u65b9\u6cd5\/\u51fd\u6570\u8fd4\u56de\u7c7b\u578b\u7b49\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u65f6\u901a\u8fc7\u63a8\u65ad\u53d8\u91cf\u3001\u8868\u8fbe\u5f0f\u3001\u5bf9\u8c61\u7b49\u7684\u7c7b\u578b\u6765\u786e\u5b9a\u7c7b\u578b\uff0c\u8fd9\u88ab\u79f0\u4e3a<code>\u201c\u7c7b\u578b\u63a8\u65ad\u201d<\/code>\u3002<\/p>\n<h2>Scala\u7684<code>Int<\/code>\u548cJava\u7684<code>java.lang.Integer<\/code>\u6709\u54ea\u4e9b\u76f8\u4f3c\u4e4b\u5904\u548c\u4e0d\u540c\u4e4b\u5904\uff1f\u5728Scala\u4e2d\uff0c<code>Int<\/code>\u548c<code>RichInt<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u5173\u7cfb\uff1f<\/h2>\n<h3>Scala\u7684<code>Int<\/code>\u548cJava\u7684<code>java.lang.Integer<\/code>\u4e4b\u95f4\u7684\u76f8\u4f3c\u4e4b\u5904\uff1a<\/h3>\n<ul>\n<li>\u4e24\u8005\u90fd\u662f\u7c7b\u3002<\/li>\n<li>\u4e24\u8005\u90fd\u7528\u4e8e\u8868\u793a\u6574\u6570\u3002<\/li>\n<li>\u4e24\u8005\u90fd\u662f32\u4f4d\u6709\u7b26\u53f7\u6574\u6570\u3002<\/li>\n<\/ul>\n<h3>Scala\u7684<code>Int<\/code>\u548cJava\u7684<code>java.lang.Integer<\/code>\u4e4b\u95f4\u7684\u533a\u522b\u662f\uff1a<\/h3>\n<ul>\n<li>Scala\u7684<code>Int<\/code>\u7c7b\u6ca1\u6709\u5b9e\u73b0<code>Comparable<\/code>\u63a5\u53e3\u3002<\/li>\n<li>Java\u7684<code>java.lang.Integer<\/code>\u7c7b\u5b9e\u73b0\u4e86<code>Comparable<\/code>\u63a5\u53e3\u3002<\/li>\n<\/ul>\n<p>Java\u7684<code>Integer<\/code>\u4e0eScala\u7684<code>Int<\/code>\u548c<code>RichInt<\/code>\u7c7b\u4f3c\u3002<code>RichInt<\/code>\u662f\u5728<code>scala.runtime<\/code>\u5305\u4e2d\u5b9a\u4e49\u7684final\u7c7b\uff0c\u7c7b\u4f3c\u4e8e<code>\"scala.runtime.RichInt\"<\/code>\u3002\u5728Scala\u4e2d\uff0c<code>Int<\/code>\u548c<code>RichInt<\/code>\u4e4b\u95f4\u7684\u5173\u7cfb\u662f\uff0c\u5f53\u6211\u4eec\u5728Scala\u7a0b\u5e8f\u4e2d\u4f7f\u7528<code>Int<\/code>\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u8f6c\u6362\u4e3a<code>RichInt<\/code>\u4ee5\u5229\u7528\u8be5\u7c7b\u4e2d\u7684\u6240\u6709\u53ef\u7528\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u8bf4<code>RichInt<\/code>\u662f<code>Int<\/code>\u7684\u4e00\u4e2a\u9690\u5f0f\u7c7b\u3002\uff08\u6211\u4eec\u5c06\u5728\u4e0b\u7bc7\u6587\u7ae0\u4e2d\u8ba8\u8bba<code>\"\u9690\u5f0f\u662f\u4ec0\u4e48\u4ee5\u53ca\u9690\u5f0f\u7684\u4f18\u52bf\"<\/code>\uff09\u3002<\/p>\n<h2>\u4ec0\u4e48\u662fScala\u4e2d\u7684<code>Nothing<\/code>\uff1f\u4ec0\u4e48\u662fScala\u4e2d\u7684<code>Nil<\/code>\uff1fScala\u4e2d\u7684<code>Nothing<\/code>\u548c<code>Nil<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u5173\u7cfb\uff1f<\/h2>\n<p>\u5728Scala\u4e2d\uff0c<code>Nothing<\/code>\u662f\u4e00\u79cd\u7c7b\u578b\uff08final\u7c7b\uff09\u3002\u5b83\u88ab\u5b9a\u4e49\u5728Scala\u7c7b\u578b\u7cfb\u7edf\u7684\u5e95\u90e8\uff0c\u610f\u5473\u7740\u5b83\u662fScala\u4e2d\u4efb\u4f55\u7c7b\u578b\u7684\u5b50\u7c7b\u578b\u3002<code>Nothing<\/code>\u6ca1\u6709\u4efb\u4f55\u5b9e\u4f8b\u3002\u5728Scala\u4e2d\u4f7f\u7528<code>Nothing<\/code>\u7684\u60c5\u51b5\u662f\uff1a<\/p>\n<ul>\n<li><code>Nil<\/code>\u662f\u4f7f\u7528<code>Nothing<\/code>\u5b9a\u4e49\u7684\uff08\u53c2\u89c1\u4e0b\u9762\u7684\u793a\u4f8b\uff09\u3002<\/li>\n<li><code>None<\/code>\u662f\u4f7f\u7528<code>Nothing<\/code>\u5b9a\u4e49\u7684\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-scala\">object None extends Option[Nothing]\r\n<\/code><\/pre>\n<ul>\n<li>\u6211\u4eec\u53ef\u4ee5\u5c06<code>Nothing<\/code>\u7528\u4f5c\u6c38\u4e0d\u8fd4\u56de\u7684\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b\u3002<\/li>\n<li>\u6211\u4eec\u53ef\u4ee5\u5c06<code>Nothing<\/code>\u7528\u4f5c\u5f02\u5e38\u7ec8\u6b62\u7684\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<p><code>Nil<\/code>\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u7528\u4e8e\u8868\u793a\u7a7a\u5217\u8868\u3002\u5b83\u5728<code>scala.collection.immutable<\/code>\u5305\u4e2d\u5b9a\u4e49\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre><code class=\"language-scala\">object Nil extends List[Nothing]\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n<pre><code class=\"language-scala\">scala&gt; Nil\r\nres5: scala.collection.immutable.Nil.type = List()\r\n\r\nscala&gt; Nil.length\r\nres6: Int = 0\r\n<\/code><\/pre>\n<h2>\u5728Scala\u4e2d\uff0c<code>Null<\/code>\u662f\u4ec0\u4e48\uff1f\u5728Scala\u4e2d\uff0c<code>null<\/code>\u662f\u4ec0\u4e48\uff1f<code>Null<\/code>\u548c<code>null<\/code>\u5728Scala\u4e2d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h2>\n<h3>Scala\u4e2d\u7684Null\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c<code>Null<\/code>\u662f\u4e00\u4e2a\u7c7b\u578b\uff08<code>final<\/code>\u7c7b\uff09\u3002<code>Null<\/code>\u7c7b\u578b\u5728\u201cscala\u201d\u5305\u4e2d\u4ee5\u201c<code>scala.Null<\/code>\u201d\u7684\u5f62\u5f0f\u53ef\u7528\u3002\u5b83\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5373<code>null<\/code>\u3002\u5728Scala\u4e2d\uff0c\u201c<code>null<\/code>\u201d\u662f<code>scala.Null<\/code>\u7c7b\u578b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>scala&gt; val myNullRef : Null = null\r\nmyNullRef: Null = null\r\n<\/code><\/pre>\n<p>\u5728Scala\u7c7b\u578b\u7cfb\u7edf\u4e2d\uff0c\u6211\u4eec\u4e0d\u80fd\u4e3a<code>Null<\/code>\u7c7b\u578b\u5f15\u7528\u5206\u914d\u5176\u4ed6\u503c\u3002\u5b83\u53ea\u63a5\u53d7\u201c<code>null<\/code>\u201d\u503c\u3002<code>Null<\/code>\u662f\u6240\u6709\u5f15\u7528\u7c7b\u578b\u7684\u5b50\u7c7b\u578b\u3002<code>Null<\/code>\u4f4d\u4e8eScala\u7c7b\u578b\u7cfb\u7edf\u7684\u5e95\u90e8\u3002\u7531\u4e8e\u5b83\u4e0d\u662f\u503c\u7c7b\u578b\u7684\u5b50\u7c7b\u578b\uff0c\u6211\u4eec\u4e0d\u80fd\u5c06\u201c<code>null<\/code>\u201d\u8d4b\u7ed9\u4efb\u4f55\u503c\u7c7b\u578b\u7684\u53d8\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>scala&gt; val myInt : Int = null\r\n:10: error: an expression of type Null is ineligible for implicit conversion\r\n       val myInt : Int = null\r\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u53d1\u751f\u4e86\u7c7b\u578b\u4e0d\u5339\u914d\u7684\u9519\u8bef\u3002\u627e\u5230\u7684\u662f<code>Null<\/code>(<code>null<\/code>)\uff0c\u4f46\u9700\u8981\u7684\u662f<code>Int<\/code>\u7c7b\u578b\u3002<code>Null<\/code>\u548c<code>Int<\/code>\u4e4b\u95f4\u7684\u9690\u5f0f\u8f6c\u6362\u4e0d\u9002\u7528\uff0c\u56e0\u4e3a\u5b83\u4eec\u662f\u6a21\u7cca\u7684\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0cUnit\u662f\u4ec0\u4e48\uff1fJava\u7684void\u548cScala\u7684Unit\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c<code>Unit<\/code>\u7528\u4e8e\u8868\u793a\u201c\u6ca1\u6709\u503c\u201d\u6216\u201c\u6ca1\u6709\u6709\u7528\u7684\u503c\u201d\u3002<code>Unit<\/code>\u662f\u201cscala\u201d\u5305\u4e2d\u5b9a\u4e49\u7684\u4e00\u4e2a\u6700\u7ec8\u7c7b\uff0c\u5373\u201c<code>scala.Unit<\/code>\u201d\u3002<code>Unit<\/code>\u7c7b\u4f3c\u4e8eJava\u7684<code>void<\/code>\uff0c\u4f46\u5b83\u4eec\u6709\u4e00\u4e9b\u533a\u522b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>Java\u7684<code>void<\/code>\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c\uff0c\u5b83\u8868\u793a\u201c\u65e0\u201d\u3002<\/li>\n<li>Scala\u7684<code>Unit<\/code>\u6709\u4e00\u4e2a\u503c\uff0c\u5373<code>()<\/code>\u3002<\/li>\n<li><code>()<\/code>\u662fScala\u4e2d<code>Unit<\/code>\u7c7b\u578b\u7684\u552f\u4e00\u503c\u3002\u7136\u800c\uff0cJava\u4e2d\u6ca1\u6709<code>void<\/code>\u7c7b\u578b\u7684\u503c\u3002<\/li>\n<li>Java\u7684<code>void<\/code>\u662f\u4e00\u4e2a\u5173\u952e\u5b57\u3002Scala\u7684<code>Unit<\/code>\u662f\u4e00\u4e2a\u6700\u7ec8\u7c7b\u3002<\/li>\n<\/ul>\n<p>\u4e24\u8005\u90fd\u7528\u6765\u8868\u793a\u65b9\u6cd5\u6216\u51fd\u6570\u4e0d\u8fd4\u56de\u4efb\u4f55\u4e1c\u897f\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0cval\u548cvar\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c<code>val<\/code>\u548c<code>var<\/code>\u90fd\u7528\u4e8e\u5b9a\u4e49\u53d8\u91cf\u3002\u7136\u800c\uff0c\u5b83\u4eec\u4e4b\u95f4\u5b58\u5728\u4e00\u4e9b\u663e\u8457\u7684\u533a\u522b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><code>var<\/code>\u4ee3\u8868\u201c\u53d8\u91cf\u201d\uff08variable\uff09\u3002<\/li>\n<li><code>val<\/code>\u4ee3\u8868\u201c\u503c\u201d\uff08value\uff09\u3002<\/li>\n<li>\u6b63\u5982\u6211\u4eec\u6240\u77e5\uff0c\u53d8\u91cf\u610f\u5473\u7740\u53ef\u53d8\uff0c\u800c\u503c\u610f\u5473\u7740\u5e38\u91cf\u3002<\/li>\n<li><code>var<\/code>\u7528\u4e8e\u5b9a\u4e49\u53ef\u53d8\u53d8\u91cf\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\uff0c\u6211\u4eec\u53ef\u4ee5\u91cd\u65b0\u8d4b\u503c\u3002<\/li>\n<li><code>val<\/code>\u7528\u4e8e\u5b9a\u4e49\u4e0d\u53ef\u53d8\u53d8\u91cf\uff0c\u8fd9\u610f\u5473\u7740\u4e00\u65e6\u521b\u5efa\uff0c\u6211\u4eec\u4e0d\u80fd\u91cd\u65b0\u8d4b\u503c\u3002<\/li>\n<li>\u7b80\u5355\u6765\u8bf4\uff0c\u5728Java\u672f\u8bed\u4e2d\uff0c<code>var<\/code>\u76f8\u5f53\u4e8e\u666e\u901a\u53d8\u91cf\uff0c\u800c<code>val<\/code>\u76f8\u5f53\u4e8e<code>final<\/code>\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<h3>REPL\u5728Scala\u4e2d\u662f\u4ec0\u4e48\uff1fScala\u7684REPL\u6709\u4ec0\u4e48\u7528\u9014\uff1f\u5982\u4f55\u4eceCMD\u63d0\u793a\u7b26\u4e2d\u8bbf\u95eeScala\u7684REPL\uff1f<\/h3>\n<p>REPL\u662fRead-Evaluate-Print Loop\u7684\u7f29\u5199\uff0c\u53ef\u4ee5\u53d1\u97f3\u4e3a\u201cripple\u201d\u3002\u5728Scala\u4e2d\uff0cREPL\u4f5c\u4e3a\u89e3\u91ca\u5668\u4ece\u547d\u4ee4\u884c\u63d0\u793a\u7b26\u6267\u884cScala\u4ee3\u7801\u3002\u56e0\u6b64\uff0cREPL\u4e5f\u88ab\u79f0\u4e3aScala CLI\uff08\u547d\u4ee4\u884c\u754c\u9762\uff09\u6216Scala\u547d\u4ee4\u884cshell\u3002REPL\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5f00\u53d1\u548c\u6d4b\u8bd5Scala\u4ee3\u7801\u7684\u5c0f\u7247\u6bb5\uff0c\u4ee5\u8fdb\u884c\u7ec3\u4e60\u3002\u5bf9\u4e8eScala\u521d\u5b66\u8005\u6765\u8bf4\uff0c\u5b83\u975e\u5e38\u6709\u7528\uff0c\u53ef\u4ee5\u7ec3\u4e60\u57fa\u672c\u7a0b\u5e8f\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u201c<code>scala<\/code>\u201d\u547d\u4ee4\u8bbf\u95eeREPL\u3002\u5f53\u6211\u4eec\u5728CMD\u63d0\u793a\u7b26\u5904\u952e\u5165\u201c<code>scala<\/code>\u201d\u547d\u4ee4\u65f6\uff0c\u6211\u4eec\u5c06\u83b7\u5f97REPL shell\uff0c\u53ef\u4ee5\u5728\u5176\u4e2d\u8f93\u5165\u548c\u6267\u884cScala\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code>D:\\&gt; scala\r\n\r\nscala&gt;\r\n<\/code><\/pre>\n<h3>Scala\u7684\u7279\u6027\u6709\u54ea\u4e9b\uff1f<\/h3>\n<p>Scala\u7f16\u7a0b\u8bed\u8a00\u652f\u6301\u4ee5\u4e0b\u529f\u80fd\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u540c\u65f6\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08\u547d\u4ee4\u5f0f\u98ce\u683c\uff09\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b<\/li>\n<li>\u7eaf\u7cb9\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00<\/li>\n<li>\u652f\u6301\u6240\u6709\u51fd\u6570\u5f0f\u7279\u6027<\/li>\n<li>REPL\uff08\u8bfb\u53d6-\u6c42\u503c-\u6253\u5370\u5faa\u73af\uff09\u89e3\u91ca\u5668<\/li>\n<li>\u5f3a\u7c7b\u578b\u7cfb\u7edf<\/li>\n<li>\u9759\u6001\u7c7b\u578b\u8bed\u8a00<\/li>\n<li>\u7c7b\u578b\u63a8\u65ad<\/li>\n<li>\u652f\u6301\u6a21\u5f0f\u5339\u914d<\/li>\n<li>\u652f\u6301\u95ed\u5305<\/li>\n<li>\u652f\u6301\u6301\u4e45\u5316\u6570\u636e\u7ed3\u6784<\/li>\n<li>\u4f7f\u7528Actor\u6a21\u578b\u5f00\u53d1\u5e76\u53d1\u5e94\u7528\u7a0b\u5e8f<\/li>\n<li>\u4e0eJava\u4e92\u64cd\u4f5c<\/li>\n<li>\u63d0\u4f9b\u6240\u6709\u5f00\u53d1\u5de5\u5177\u2014\u2014IDE\u3001\u6784\u5efa\u5de5\u5177\u3001Web\u6846\u67b6\u3001TDD\u548cBDD\u6846\u67b6<\/li>\n<\/ul>\n<h3>\u6211\u4eec\u5982\u4f55\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u5b9e\u73b0\u5faa\u73af\u529f\u80fd\uff1f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u548c\u51fd\u6570\u5f0f\u7f16\u7a0b\u5faa\u73af\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u6211\u4eec\u77e5\u9053\u5982\u4f55\u4ee5\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\u5b9e\u73b0\u5faa\u73af\uff1a\u4f7f\u7528\u53ef\u53d8\u7684\u4e34\u65f6\u53d8\u91cf\uff0c\u66f4\u65b0\u53d8\u91cf\u7684\u503c\u5e76\u4f7f\u7528\u5faa\u73af\u7ed3\u6784\u3002\u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u7e41\u7410\u4e14\u4e0d\u5b89\u5168\u3002\u5b83\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\u4f7f\u7528\u4ee5\u4e0b\u7ed3\u6784\u6765\u5b9e\u73b0\u5faa\u73af\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u5faa\u73af\u7ed3\u6784\uff08Loop Constructs\uff09<\/li>\n<li>\u53ef\u53d8\u6027\uff08Mutability\uff09<\/li>\n<li>\u526f\u4f5c\u7528\uff08Side Effects\uff09<\/li>\n<\/ul>\n<p>\u6211\u4eec\u53ef\u4ee5\u4ee5\u4e0d\u540c\u7684\u65b9\u5f0f\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u4e2d\u5b9e\u73b0\u76f8\u540c\u7684\u5faa\u73af\u3002\u5b83\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6280\u672f\u6765\u4ee5\u51fd\u6570\u5f0f\u98ce\u683c\u5b9e\u73b0\u5faa\u73af\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u9012\u5f52\uff08Recursion\uff09<\/li>\n<li>\u5c3e\u9012\u5f52\uff08Tail-Recursion\uff09<\/li>\n<li>\u4e0d\u53ef\u53d8\u6027\uff08Immutability\uff09<\/li>\n<li>\u65e0\u526f\u4f5c\u7528\uff08No Side-Effects\uff09<\/li>\n<\/ul>\n<h3>\u5728Scala\u4e2d\uff0c\u201cApplication\u201d\u662f\u4ec0\u4e48\uff1f\u5728Scala\u4e2d\uff0c\u201cApp\u201d\u662f\u4ec0\u4e48\uff1fScala\u7684\u201cApp\u201d\u6709\u4ec0\u4e48\u7528\u9014\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c<code>App<\/code>\u662f\u4e00\u4e2a\u5728<code>scala<\/code>\u5305\u4e2d\u5b9a\u4e49\u7684\u7279\u8d28\uff08trait\uff09\uff0c\u5373\u201c<code>scala.App<\/code>\u201d\u3002\u5b83\u5b9a\u4e49\u4e86<code>main<\/code>\u65b9\u6cd5\u3002\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u6216\u4e00\u4e2a\u7c7b\u7ee7\u627f\u4e86\u8fd9\u4e2a\u7279\u8d28\uff0c\u90a3\u4e48\u5b83\u4eec\u5c06\u81ea\u52a8\u6210\u4e3aScala\u7684\u53ef\u6267\u884c\u7a0b\u5e8f\uff0c\u56e0\u4e3a\u5b83\u4eec\u4f1a\u4ece<code>Application<\/code>\u4e2d\u7ee7\u627f<code>main<\/code>\u65b9\u6cd5\u3002\u4f7f\u7528<code>App<\/code>\u7684\u4e3b\u8981\u4f18\u70b9\u662f\u6211\u4eec\u4e0d\u9700\u8981\u7f16\u5199<code>main<\/code>\u65b9\u6cd5\u3002\u4f7f\u7528<code>App<\/code>\u7684\u4e3b\u8981\u7f3a\u70b9\u662f\u6211\u4eec\u5e94\u8be5\u4f7f\u7528\u76f8\u540c\u7684\u540d\u79f0\u201c<code>args<\/code>\u201d\u6765\u5f15\u7528\u547d\u4ee4\u884c\u53c2\u6570\uff0c\u56e0\u4e3a<code>scala.App<\/code>\u7684<code>main()<\/code>\u65b9\u6cd5\u4f7f\u7528\u8fd9\u4e2a\u540d\u79f0\u3002\u4f8b\u5982\uff0c\u4e0d\u4f7f\u7528Scala <code>App<\/code>\uff1a<\/p>\n<pre class=\"post-pre\"><code>object MyApp {\r\n    def main( args: Array[String]){\r\n        println(\"Hello World!\")\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u4f7f\u7528Scala <code>App<\/code>:<\/p>\n<pre class=\"post-pre\"><code>object MyApp extends App{\r\n   println(\"Hello World!\")\r\n}\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u89c2\u5bdf\u4ee5\u4e0a\u4e24\u4e2a\u4f8b\u5b50\uff0c\u5728\u7b2c\u4e8c\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u6ca1\u6709\u5b9a\u4e49<code>main<\/code>\u65b9\u6cd5\uff0c\u56e0\u4e3a\u6211\u4eec\u4eceScala <code>App<\/code>\uff08Application\uff09\u7ee7\u627f\u3002\u5728Scala 2.9\u4e4b\u524d\uff0c\u6211\u4eec\u6709<code>scala.Application<\/code>\u7279\u8d28\u3002\u4f46\u662f\u4eceScala 2.9\u7248\u672c\u5f00\u59cb\uff0c\u5b83\u5df2\u7ecf\u88ab<code>scala.App<\/code>\u5f03\u7528\u3002<\/p>\n<h3>Scala\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5417\uff1fJava\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u5417\uff1f<\/h3>\n<p>Java\u4e0d\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3002Scala\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3002\u539f\u56e0\u662fJava\u4e0d\u60f3\u652f\u6301\u4e00\u4e9b\u53ef\u80fd\u5f15\u8d77\u8bef\u89e3\u7684\u65b9\u6cd5\u540d\uff0c\u4f8b\u5982\u201c<code>+*\/<\/code>\u201d\u3002Scala\u8d4b\u4e88\u5f00\u53d1\u8005\u8fd9\u79cd\u7075\u6d3b\u6027\u6765\u51b3\u5b9a\u5e94\u8be5\u4f7f\u7528\u54ea\u4e9b\u65b9\u6cd5\/\u51fd\u6570\u540d\u3002\u5f53\u6211\u4eec\u8c03\u7528<code>2 + 3<\/code>\u65f6\uff0c\u610f\u5473\u7740\u2018<code>+<\/code>\u2019\u4e0d\u662f\u4e00\u4e2a\u8fd0\u7b97\u7b26\uff0c\u800c\u662f<code>Int<\/code>\u7c7b\uff08\u6216\u5b83\u7684\u9690\u5f0f\u7c7b\u578b\uff09\u4e2d\u53ef\u7528\u7684\u4e00\u4e2a\u65b9\u6cd5\u3002\u5728\u5185\u90e8\uff0c\u8fd9\u4e2a\u8c03\u7528\u88ab\u8f6c\u6362\u4e3a\u201c<code>2.+(3)<\/code>\u201d\u3002<\/p>\n<h3>\u8868\u8fbe\u5f0f\u662f\u4ec0\u4e48\uff1f\u8bed\u53e5\u662f\u4ec0\u4e48\uff1f\u8868\u8fbe\u5f0f\u548c\u8bed\u53e5\u4e4b\u95f4\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p><strong>\u8868\u8fbe\u5f0f\uff1a<\/strong>\u8868\u8fbe\u5f0f\u662f\u4e00\u4e2a\u503c\uff0c\u610f\u5473\u7740\u5b83\u5c06\u88ab\u8ba1\u7b97\u4e3a\u4e00\u4e2a\u503c\u3002\u5f53\u4e00\u4e2a\u8868\u8fbe\u5f0f\u8fd4\u56de\u4e00\u4e2a\u503c\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5b83\u8d4b\u7ed9\u4e00\u4e2a\u53d8\u91cf\u3002\u4f8b\u5b50\uff1aScala\u7684<code>If<\/code>\u6761\u4ef6\uff0cJava\u7684\u4e09\u5143\u8fd0\u7b97\u7b26\u3002<\/p>\n<p><strong>\u8bed\u53e5\uff1a<\/strong>\u8bed\u53e5\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6216\u591a\u4e2a\u64cd\u4f5c\u3002\u8fd9\u610f\u5473\u7740\u8bed\u53e5\u6267\u884c\u64cd\u4f5c\u3002\u7531\u4e8e\u5b83\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c\uff0c\u6211\u4eec\u65e0\u6cd5\u5c06\u5176\u8d4b\u7ed9\u4e00\u4e2a\u53d8\u91cf\u3002\u4f8b\u5b50\uff1aJava\u7684<code>If<\/code>\u6761\u4ef6\u3002<\/p>\n<h3>Java\u7684\u201cif\u2026else\u201d\u548cScala\u7684\u201cif\u2026else\u201d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p><strong>Java\u7684\u201cif\u2026else\u201d\uff1a<\/strong>\u5728Java\u4e2d\uff0c\u201c<code>if\u2026else<\/code>\u201d\u662f\u4e00\u4e2a\u8bed\u53e5\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\u3002\u5b83\u4e0d\u8fd4\u56de\u503c\uff0c\u4e5f\u4e0d\u80fd\u5c06\u5176\u8d4b\u503c\u7ed9\u53d8\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code> int year;\r\n if( count == 0) \r\n   year = 2014;\r\n else \r\n   year = 2015;\r\n<\/code><\/pre>\n<p><strong>Scala\u7684\u201cif\u2026else\u201d\uff1a<\/strong>\u5728Scala\u4e2d\uff0c\u201c<code>If\u2026Else<\/code>\u201d\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\u3002\u5b83\u4f1a\u6c42\u503c\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\u3002<\/p>\n<pre class=\"post-pre\"><code> val year = if( count == 0) 2014 else 2015\r\n<\/code><\/pre>\n<p>\u6ce8\u610f\uff1aScala\u7684\u201c<code>If\u2026Else<\/code>\u201d\u7684\u5de5\u4f5c\u65b9\u5f0f\u7c7b\u4f3c\u4e8eJava\u7684\u4e09\u5143\u8fd0\u7b97\u7b26\u3002\u6211\u4eec\u53ef\u4ee5\u50cf\u4e0b\u9762\u793a\u4f8b\u90a3\u6837\u4f7f\u7528Scala\u7684\u201c<code>If\u2026Else<\/code>\u201d\u6765\u66ff\u4ee3Java\u7684\u201c<code>If\u2026Else<\/code>\u201d\u8bed\u53e5\u3002<\/p>\n<pre class=\"post-pre\"><code> val year = 0\r\n if( count == 0) \r\n   year = 2014 \r\n else \r\n   year = 2015\r\n<\/code><\/pre>\n<h3>Scala\u662f\u4e00\u79cd\u57fa\u4e8e\u8868\u8fbe\u5f0f\u7684\u8bed\u8a00\u8fd8\u662f\u57fa\u4e8e\u8bed\u53e5\u7684\u8bed\u8a00\uff1fJava\u662f\u4e00\u79cd\u57fa\u4e8e\u8868\u8fbe\u5f0f\u7684\u8bed\u8a00\u8fd8\u662f\u57fa\u4e8e\u8bed\u53e5\u7684\u8bed\u8a00\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u6240\u6709\u7684\u4e1c\u897f\u90fd\u662f\u4e00\u4e2a\u503c\u3002\u6240\u6709\u7684\u8868\u8fbe\u5f0f\u6216\u8bed\u53e5\u90fd\u4f1a\u88ab\u6c42\u503c\u4e3a\u4e00\u4e2a\u503c\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u8868\u8fbe\u5f0f\u3001\u51fd\u6570\u3001\u95ed\u5305\u3001\u5bf9\u8c61\u7b49\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\u3002\u56e0\u6b64\uff0cScala\u662f\u4e00\u79cd\u9762\u5411\u8868\u8fbe\u5f0f\u7684\u8bed\u8a00\u3002\u800c\u5728Java\u4e2d\uff0c\u8bed\u53e5\u4e0d\u662f\u8868\u8fbe\u5f0f\u6216\u503c\u3002\u6211\u4eec\u4e0d\u80fd\u5c06\u5b83\u4eec\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\u3002\u6240\u4ee5\uff0cJava\u4e0d\u662f\u4e00\u79cd\u9762\u5411\u8868\u8fbe\u5f0f\u7684\u8bed\u8a00\uff0c\u5b83\u662f\u4e00\u79cd\u57fa\u4e8e\u8bed\u53e5\u7684\u8bed\u8a00\u3002<\/p>\n<h3>\u544a\u8bc9\u6211\u4e00\u4e9bJava\u652f\u6301\u4f46Scala\u4e0d\u652f\u6301\u7684\u529f\u80fd\uff0c\u4ee5\u53ca\u53cd\u8fc7\u6765\u7684\u60c5\u51b5\uff1f<\/h3>\n<p>\uff08\u6b64\u5904\u539f\u6587\u672a\u63d0\u4f9b\u5177\u4f53\u5185\u5bb9\uff0c\u8bf7\u8865\u5145\u6216\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u56de\u7b54\uff09<\/p>\n<p>\u8fd9\u662f\u6587\u7ae0\u300aScala\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848\u300b\u7684\u7b2c4\u90e8\u5206\uff08\u51714\u90e8\u5206\uff09\u3002<\/p>\n<ul class=\"post-ul\">\n<li>Java\u4e0d\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\uff0c\u4f46Scala\u652f\u6301\u3002<\/li>\n<li>Java\u652f\u6301<code>++<\/code>\u548c<code>--<\/code>\u8fd0\u7b97\u7b26\uff0c\u4f46Scala\u4e0d\u652f\u6301\u3002<\/li>\n<li>Java\u6709\u53d7\u68c0\u5f02\u5e38\uff08Checked Exceptions\uff09\u548c\u975e\u53d7\u68c0\u5f02\u5e38\uff08Unchecked Exceptions\uff09\uff0c\u4f46Scala\u6ca1\u6709\u53d7\u68c0\u5f02\u5e38\u3002<\/li>\n<li>Scala\u4e0d\u652f\u6301<code>break<\/code>\u548c<code>continue<\/code>\u8bed\u53e5\uff0c\u4f46Java\u4f7f\u7528\u5b83\u4eec\u3002<\/li>\n<li>Scala\u6ca1\u6709\u663e\u5f0f\u7c7b\u578b\u8f6c\u6362\uff0c\u4f46Java\u652f\u6301\u6b64\u529f\u80fd\u3002<\/li>\n<li>Scala\u652f\u6301\u6a21\u5f0f\u5339\u914d\uff0c\u4f46Java\u4e0d\u652f\u6301\u3002<\/li>\n<li>Java\u4f7f\u7528\u539f\u59cb\u6570\u636e\u7c7b\u578b\uff08Primitive Data types\uff09\uff0c\u4f46Scala\u6ca1\u6709\u3002<\/li>\n<li>Java\u652f\u6301\u9759\u6001\u6210\u5458\uff0c\u4f46Scala\u6ca1\u6709\u9759\u6001\u6210\u5458\u7684\u6982\u5ff5\u3002<\/li>\n<li>Scala\u652f\u6301\u9690\u5f0f\uff08Implicits\uff09\u548c\u7279\u8d28\uff08Traits\uff09\uff0cJava\u4e0d\u652f\u6301\u5b83\u4eec\u3002<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\uff1a<\/strong> \u8fd9\u4e2a\u5217\u8868\u8d85\u8fc7\u4e00\u9875\u3002\u4e0d\u8fc7\u4ee5\u4e0b\u662f\u4e00\u4e9b\u91cd\u8981\u7684\u89c2\u70b9\uff0c\u8bb0\u4f4fScala\u548cJava\u529f\u80fd\u4e4b\u95f4\u7684\u533a\u522b\uff0c\u4ee5\u5e94\u5bf9Scala\u9762\u8bd5\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c\u51fd\u6570\uff08Function\uff09\u548c\u65b9\u6cd5\uff08Method\uff09\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p>Scala\u652f\u6301\u51fd\u6570\u548c\u65b9\u6cd5\u3002\u6211\u4eec\u4f7f\u7528\u76f8\u540c\u7684\u8bed\u6cd5\u6765\u5b9a\u4e49\u51fd\u6570\u548c\u65b9\u6cd5\uff0c\u6ca1\u6709\u8bed\u6cd5\u4e0a\u7684\u533a\u522b\u3002\u7136\u800c\uff0c\u5b83\u4eec\u6709\u4e00\u4e2a\u5c0f\u5c0f\u7684\u533a\u522b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u6211\u4eec\u53ef\u4ee5\u5728Scala\u7c7b\u6216\u7279\u8d28\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u65b9\u6cd5\u3002\u65b9\u6cd5\u4e0e\u4e00\u4e2a\u5bf9\u8c61\uff08\u7c7b\u7684\u5b9e\u4f8b\uff09\u76f8\u5173\u8054\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u7c7b\u7684\u5b9e\u4f8b\u6765\u8c03\u7528\u65b9\u6cd5\u3002\u6211\u4eec\u4e0d\u80fd\u4e0d\u4f7f\u7528\u5bf9\u8c61\u76f4\u63a5\u8c03\u7528Scala\u65b9\u6cd5\u3002<\/li>\n<li>\u51fd\u6570\u4e0d\u4e0e\u7c7b\u6216\u7279\u8d28\u5173\u8054\u3002\u5b83\u5728Scala\u5305\u4e2d\u5b9a\u4e49\u3002\u6211\u4eec\u53ef\u4ee5\u4e0d\u4f7f\u7528\u5bf9\u8c61\u76f4\u63a5\u8bbf\u95ee\u51fd\u6570\uff0c\u7c7b\u4f3c\u4e8eJava\u7684\u9759\u6001\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u5728\u6211\u63a5\u4e0b\u6765\u7684\u5e16\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u7c7b\u3001\u7279\u8d28\u3001\u5305\u3001\u5bf9\u8c61\u7b49\u5185\u5bb9\u3002<\/p>\n<h3>\u5728Scala\u6e90\u6587\u4ef6\u4e2d\u53ef\u4ee5\u5b9a\u4e49\u591a\u5c11\u4e2a\u516c\u5171\u7c7b\u6587\u4ef6\uff1f<\/h3>\n<p>\u5728Java\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6e90\u6587\u4ef6\u4e2d\u5b9a\u4e49\u81f3\u591a\u4e00\u4e2a\u516c\u5171\u7c7b\/\u63a5\u53e3\u3002\u4e0d\u540c\u4e8eJava\uff0cScala\u652f\u6301\u5728\u540c\u4e00\u4e2a\u6e90\u6587\u4ef6\u4e2d\u5b9a\u4e49\u591a\u4e2a\u516c\u5171\u7c7b\u3002\u6211\u4eec\u53ef\u4ee5\u5728Scala\u6e90\u6587\u4ef6\u4e2d\u5b9a\u4e49\u4efb\u610f\u6570\u91cf\u7684\u516c\u5171\u7c7b\/\u63a5\u53e3\/\u7279\u8d28\u3002<\/p>\n<h3>\u50cfJava\u4e00\u6837\uff0cScala\u8bed\u8a00\u4e2d\u7684\u9ed8\u8ba4\u5bfc\u5165\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u6211\u4eec\u77e5\u9053\uff0c<code>java.lang<\/code>\u662fJVM\u81ea\u52a8\u5bfc\u5165\u6240\u6709Java\u7a0b\u5e8f\u7684\u9ed8\u8ba4\u5305\u3002\u6211\u4eec\u4e0d\u9700\u8981\u663e\u5f0f\u5730\u5bfc\u5165\u8fd9\u4e2a\u5305\u3002\u540c\u6837\uff0c\u4ee5\u4e0b\u662f\u6240\u6709Scala\u7a0b\u5e8f\u4e2d\u53ef\u7528\u7684\u9ed8\u8ba4\u5bfc\u5165\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><code>java.lang<\/code> \u5305<\/li>\n<li><code>scala<\/code> \u5305<\/li>\n<li><code>scala.Predef<\/code><\/li>\n<\/ul>\n<h3>Scala \u4e2d\u6709\u591a\u5c11\u79cd\u8fd0\u7b97\u7b26\uff1f\u4e3a\u4ec0\u4e48\u4f1a\u6709\u8fd9\u4e48\u591a\u79cd\u8fd0\u7b97\u7b26\uff1f<\/h3>\n<p>\u4e0eJava\u4e0d\u540c\uff0c\u50cfC++\u4e00\u6837\uff0cScala\u652f\u6301\u8fd0\u7b97\u7b26\u91cd\u8f7d\u3002Scala\u53ea\u6709\u4e00\u4e2a\u64cd\u4f5c\u7b26\uff0c\u5c31\u662f\u201c<code>=<\/code>\u201d\uff08\u7b49\u4e8e\uff09\u64cd\u4f5c\u7b26\u3002\u9664\u6b64\u4ee5\u5916\uff0c\u5176\u4ed6\u90fd\u662f\u65b9\u6cd5\u3002\u4f8b\u5982<code>2 + 3<\/code>\uff0c\u8fd9\u91cc\u7684\u201c<code>+<\/code>\u201d\u5728Scala\u4e2d\u4e0d\u662f\u4e00\u4e2a\u64cd\u4f5c\u7b26\uff0c\u800c\u662f<code>Int<\/code>\u7c7b\u4e2d\u7684\u4e00\u4e2a\u65b9\u6cd5\u3002Scala\u7f16\u8bd1\u5668\u89c2\u5bdf\u52302\u548c3\u662f\u6574\u6570\uff0c\u5c1d\u8bd5\u5728<code>Int<\/code>\u7c7b\u4e2d\u627e\u5230\u201c<code>+<\/code>\u201d\u65b9\u6cd5\u3002\u56e0\u6b64\uff0cScala\u7f16\u8bd1\u5668\u5c06\u201c<code>2 + 3<\/code>\u201d\u8868\u8fbe\u5f0f\u8f6c\u6362\u4e3a\u201c<code>2.+(3)<\/code>\u201d\u5e76\u8c03\u7528\u6574\u6570\u5bf9\u8c61\u201c2\u201d\u4e0a\u7684\u201c<code>+<\/code>\u201d\u65b9\u6cd5\uff0c\u5c06\u6574\u6570\u5bf9\u8c61\u201c3\u201d\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u201c<code>+<\/code>\u201d\u65b9\u6cd5\u3002\u201c<code>2 + 3<\/code>\u201d\u548c\u201c<code>2.+(3)<\/code>\u201d\u662f\u76f8\u7b49\u7684\u3002\u8fd9\u53ea\u662fScala\u7528\u51fd\u6570\u5f0f\u98ce\u683c\u7f16\u5199\u7a0b\u5e8f\u7684\u8bed\u6cd5\u7cd6\u3002<\/p>\n<h3>\u5728Java\u4e2d\u4f7f\u7528\u4f46\u5728Scala\u4e2d\u4e0d\u9700\u8981\u7684\u5173\u952e\u5b57\u662f\u54ea\u4e9b\uff1f\u4e3a\u4ec0\u4e48Scala\u4e0d\u9700\u8981\u5b83\u4eec\uff1f<\/h3>\n<p>Java\u5e7f\u6cdb\u4f7f\u7528\u4ee5\u4e0b\u5173\u952e\u5b57\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><code>'public'<\/code> \u5173\u952e\u5b57 &#8211; \u7528\u4e8e\u5b9a\u4e49\u7c7b\u3001\u63a5\u53e3\u3001\u53d8\u91cf\u7b49\u3002<\/li>\n<li><code>'static'<\/code> \u5173\u952e\u5b57 &#8211; \u7528\u4e8e\u5b9a\u4e49\u9759\u6001\u6210\u5458\u3002<\/li>\n<\/ul>\n<p>Scala \u4e0d\u9700\u8981\u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\u3002Scala \u6ca1\u6709 <code>'public'<\/code> \u548c <code>'static'<\/code> \u8fd9\u4e24\u4e2a\u5173\u952e\u5b57\u3002<\/p>\n<ul class=\"post-ul\">\n<li>\u5728Scala\u4e2d\uff0c\u7c7b\u3001\u7279\u8d28\u3001\u65b9\u6cd5\/\u51fd\u6570\u3001\u5b57\u6bb5\u7b49\u7684\u9ed8\u8ba4\u8bbf\u95ee\u4fee\u9970\u7b26\u662f<code>'public'<\/code>\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u4e0d\u9700\u8981<code>'public'<\/code>\u5173\u952e\u5b57\u3002<\/li>\n<li>\u4e3a\u4e86\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOP\uff09\u539f\u5219\uff0cScala\u56e2\u961f\u907f\u514d\u4e86<code>'static'<\/code>\u5173\u952e\u5b57\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48Scala\u662f\u4e00\u4e2a\u7eaf\u9762\u5411\u5bf9\u8c61\u8bed\u8a00\u3002\u5728\u5e76\u53d1\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5904\u7406\u9759\u6001\u6210\u5458\u975e\u5e38\u56f0\u96be\u3002<\/li>\n<\/ul>\n<h3>\u5728Scala\u4e2d\uff0cPredef\u662f\u4ec0\u4e48\uff1fPredef\u5728Scala\u4e2d\u7684\u4e3b\u8981\u76ee\u7684\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c<code>Predef<\/code>\u662f\u4e00\u4e2a\u5728<code>scala<\/code>\u5305\u4e2d\u5b9a\u4e49\u7684\u5bf9\u8c61\uff0c\u540d\u4e3a\u201c<code>scala.Predef<\/code>\u201d\u3002\u8fd9\u662f\u4e00\u4e2a\u5b9e\u7528\u5bf9\u8c61\uff0c\u5b83\u5b9a\u4e49\u4e86\u8bb8\u591a\u5b9e\u7528\u65b9\u6cd5\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u63a7\u5236\u53f0I\/O (<code>print<\/code>, <code>println<\/code> \u7b49)<\/li>\n<li>\u96c6\u5408\u5b9e\u7528\u65b9\u6cd5<\/li>\n<li>\u5b57\u7b26\u4e32\u5b9e\u7528\u65b9\u6cd5<\/li>\n<li>\u9690\u5f0f\u8f6c\u6362\u65b9\u6cd5<\/li>\n<li>\u65ad\u8a00\u5b9e\u7528\u65b9\u6cd5\u7b49\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c<code>print<\/code>\u3001<code>println<\/code>\u3001<code>readLine<\/code>\u3001<code>readInt<\/code>\u3001<code>require<\/code>\u7b49\u65b9\u6cd5\u90fd\u5728<code>Predef<\/code>\u5bf9\u8c61\u4e2d\u5b9a\u4e49\u3002\u5728Scala\u4e2d\uff0c<code>Predef<\/code>\u53ef\u7528\u4e8e\u5728\u6240\u6709Scala\u7a0b\u5e8f\u4e2d\u4f7f\u7528\u5176\u65b9\u6cd5\uff0c\u800c\u65e0\u9700\u5bfc\u5165\uff0c\u56e0\u4e3aScala\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5c06\u6b64\u5bf9\u8c61\u5bfc\u5165\u5230\u6240\u6709\u7f16\u8bd1\u5355\u5143\u4e2d\uff0c\u5982\u7c7b\u3001\u5bf9\u8c61\u3001\u7279\u8d28\u7b49\u3002\u8fd9\u5c31\u662f\u5173\u4e8e\u201cScala\u57fa\u7840\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848\u201d\u7684\u5168\u90e8\u5185\u5bb9\u3002\u5728\u6211\u7684\u540e\u7eed\u5e16\u5b50\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u4e2d\u7ea7\u3001\u9ad8\u7ea7\u548c\u5b9e\u65f6\u7684Scala\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848\u3002\u5982\u679c\u60a8\u559c\u6b22\u6211\u7684\u5e16\u5b50\u6216\u6709\u4efb\u4f55\u95ee\u9898\/\u5efa\u8bae\uff0c\u8bf7\u7ed9\u6211\u7559\u8a00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6b22\u8fce\u8bbf\u95eeScala\u9762\u8bd5\u9898\u4e0e\u7b54\u6848\u3002\u5982\u4eca\uff0c\u5927\u591a\u6570\u91d1\u878d\/\u94f6\u884c\u3001\u653f\u5e9c\u3001\u7535\u4fe1\u548c\u793e\u4ea4\u7f51\u7edc\u7b49\u516c\u53f8\u90fd\u5728\u4f7f\u7528Scala\u3001Play [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[796,794,793,745,486],"class_list":{"0":"post-201","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-scala","10":"tag-745","11":"tag-486"},"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>Scala\u9762\u8bd5\u7cbe\u9009\uff1a\u5e38\u89c1\u95ee\u9898\u4e0e\u9ad8\u5206\u7b54\u6848\u89e3\u6790 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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