{"id":200,"date":"2023-05-22T14:48:09","date_gmt":"2024-02-22T17:05:59","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\/"},"modified":"2025-08-01T02:16:55","modified_gmt":"2025-07-31T18:16:55","slug":"scala-%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/scala-%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98\/","title":{"rendered":"Scala\u9762\u8bd5\u7cbe\u9009\uff1a\u5e38\u89c1\u95ee\u9898\u4e0e\u9ad8\u5206\u6280\u5de7\u89e3\u6790"},"content":{"rendered":"<h1>Scala\u9762\u8bd5\u95ee\u9898\uff1a\u4e2d\u7ea7\u4e0e\u9ad8\u7ea7\uff08\u7b2c\u4e00\u90e8\u5206\uff09<\/h1>\n<p>\u5728\u6df1\u5165\u9605\u8bfb\u672c\u6587\u4e4b\u524d\uff0c\u5efa\u8bae\u60a8\u5148\u67e5\u9605\u6211\u7684\u4e0a\u4e00\u7bc7\u6587\u7ae0\u300a<a href=\"#\">Scala\u57fa\u7840\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848<\/a>\u300b\uff0c\u4ee5\u5bf9Scala\u8bed\u8a00\u6709\u4e00\u4e2a\u57fa\u672c\u7684\u4e86\u89e3\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u4e00\u4e9b\u5bf9\u6709\u7ecf\u9a8c\u7684Scala\u5f00\u53d1\u4eba\u5458\u975e\u5e38\u6709\u7528\u7684\u9762\u8bd5\u95ee\u9898\u3002\u8bf7\u6ce8\u610f\uff1a\u7531\u4e8e\u95ee\u9898\u5217\u8868\u8f83\u957f\uff0c\u6211\u5c06\u5206\u591a\u7bc7\u6587\u7ae0\u53d1\u5e03\uff0c\u540e\u7eed\u95ee\u9898\u53ca\u7b54\u6848\u8bf7\u53c2\u8003\u300a<a href=\"#\">Scala\u4e2d\u7ea7\u548c\u9ad8\u7ea7\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848<\/a>\u300b\u3002<\/p>\n<h2>Scala\u4e2d\u7ea7\u9762\u8bd5\u95ee\u9898\u5217\u8868<\/h2>\n<p>\u672c\u8282\u5c06\u5217\u51fa\u6240\u6709Scala\u4e2d\u7ea7\u9762\u8bd5\u95ee\u9898\uff0c\u5e76\u5728\u4e0b\u4e00\u8282\u4e2d\u8be6\u7ec6\u8ba8\u8bba\u3002<\/p>\n<ol>\n<li>\u4e3b\u6784\u9020\u51fd\u6570\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684\u8f85\u52a9\u6784\u9020\u51fd\u6570\u662f\u4ec0\u4e48\uff1f\u8f85\u52a9\u6784\u9020\u51fd\u6570\u5728Scala\u4e2d\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f\u8bf7\u89e3\u91ca\u5728Scala\u4e2d\u5b9a\u4e49\u8f85\u52a9\u6784\u9020\u51fd\u6570\u65f6\u9700\u8981\u9075\u5faa\u7684\u89c4\u5219\u3002<\/li>\n<li><code>Array<\/code>\u548c<code>ArrayBuffer<\/code>\u5728Scala\u4e2d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li><code>case class<\/code>\u662f\u4ec0\u4e48\uff1f<code>case object<\/code>\u662f\u4ec0\u4e48\uff1f<code>case class<\/code>\u6709\u54ea\u4e9b\u4f18\u70b9\uff1f<\/li>\n<li><code>Case Object<\/code>\u548c\u666e\u901a<code>Object<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f\u4e0e\u666e\u901a\u7c7b\u76f8\u6bd4\uff0c<code>Case class<\/code>\u7684\u4e3b\u8981\u4f18\u70b9\u6216\u597d\u5904\u662f\u4ec0\u4e48\uff1f<\/li>\n<li><code>isInstanceOf<\/code>\u548c<code>asInstanceOf<\/code>\u65b9\u6cd5\u5728Scala\u4e2d\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1fJava\u4e2d\u6709\u7c7b\u4f3c\u7684\u6982\u5ff5\u5417\uff1f<\/li>\n<li>\u5982\u4f55\u8bc1\u660e\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c<code>Case Object<\/code>\u662f\u53ef\u5e8f\u5217\u5316\u7684\u800c\u666e\u901a<code>Object<\/code>\u4e0d\u662f\uff1f<\/li>\n<li>Scala\u4e2d<code>Array<\/code>\u548c<code>List<\/code>\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/li>\n<li><code>val<\/code>\u548c<code>lazy val<\/code>\u5728Scala\u4e2d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Eager Evaluation\u662f\u4ec0\u4e48\uff1fLazy Evaluation\u662f\u4ec0\u4e48\uff1f<\/li>\n<li><code>equals<\/code>\u65b9\u6cd5\u548c<code>==<\/code>\u5728Scala\u4e2d\u7684\u5173\u7cfb\u662f\u4ec0\u4e48\uff1f\u533a\u5206Scala\u7684<code>==<\/code>\u548cJava\u7684<code>==<\/code>\u8fd0\u7b97\u7b26\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u7684\u5185\u90e8\u7c7b\u548cJava\u7684\u5185\u90e8\u7c7b\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Diamond Problem\uff08\u83f1\u5f62\u95ee\u9898\uff09\u662f\u4ec0\u4e48\uff1fScala\u5982\u4f55\u89e3\u51b3Diamond Problem\uff1f<\/li>\n<li>\u4e3a\u4ec0\u4e48Scala\u6ca1\u6709<code>static<\/code>\u5173\u952e\u5b57\uff1f\u8fd9\u4e2a\u51b3\u5b9a\u7684\u4e3b\u8981\u539f\u56e0\u662f\u4ec0\u4e48\uff1f<\/li>\n<li><code>object<\/code>\u5173\u952e\u5b57\u5728Scala\u4e2d\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f\u5982\u4f55\u5728Scala\u4e2d\u521b\u5efa\u5355\u4f8b\u5bf9\u8c61\uff1f<\/li>\n<li>\u5982\u4f55\u4f7f\u7528<code>object<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\uff1f\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\u5728<code>object<\/code>\u4e2d\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u4e2d\u7684<code>apply<\/code>\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684<code>unapply<\/code>\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<code>apply<\/code>\u65b9\u6cd5\u548c<code>unapply<\/code>\u65b9\u6cd5\u5728Scala\u4e2d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>\u5728Scala\u4e2d\uff0c\u5982\u679c\u6211\u4eec\u5728\u4e0d\u4f7f\u7528<code>new<\/code>\u5173\u952e\u5b57\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5176\u5e95\u5c42\u5982\u4f55\u5de5\u4f5c\uff1f\u4ec0\u4e48\u65f6\u5019\u6211\u4eec\u4f1a\u9009\u62e9\u8fd9\u79cd\u65b9\u6cd5\uff1f<\/li>\n<li>\u5982\u4f55\u5728Scala\u4e2d\u58f0\u660e\u79c1\u6709\u4e3b\u6784\u9020\u51fd\u6570\uff1f\u5982\u4f55\u8c03\u7528Scala\u4e2d\u7684\u79c1\u6709\u4e3b\u6784\u9020\u51fd\u6570\uff1f<\/li>\n<li>\u4f34\u751f\u5bf9\u8c61\u80fd\u5426\u8bbf\u95ee\u5b83\u7684\u4f34\u751f\u7c7b\u7684\u79c1\u6709\u6210\u5458\uff1f<\/li>\n<li>\u5173\u4e8e\u5173\u952e\u5b57<code>class<\/code>\u548c<code>object<\/code>\u7684\u4e24\u4e2a\u5206\u5f00\u5173\u952e\u5b57\u7684\u4e3b\u8981\u8bbe\u8ba1\u51b3\u7b56\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>\u5982\u4f55\u5728Scala\u4e2d\u5b9a\u4e49\u5b9e\u4f8b\u6210\u5458\u548c\u9759\u6001\u6210\u5458\uff1f<\/li>\n<li>\u5728Scala\u4e2d\uff0c<code>object<\/code>\u662f\u4ec0\u4e48\uff1f\u5b83\u662f\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\u8fd8\u662f\u7c7b\u7684\u5b9e\u4f8b\uff1f<\/li>\n<li>\u5728Scala\u4e2d\uff0c\u4f34\u751f\u5bf9\u8c61\u662f\u4ec0\u4e48\uff1f\u5728Scala\u4e2d\uff0c\u4f34\u751f\u7c7b\u662f\u4ec0\u4e48\uff1f\u4f34\u751f\u5bf9\u8c61\u5728Scala\u4e2d\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>\u5982\u4f55\u5728Scala\u4e2d\u5b9e\u73b0\u63a5\u53e3\uff1f<\/li>\n<li><code>Range<\/code>\u5728Scala\u4e2d\u662f\u4ec0\u4e48\uff1f\u5982\u4f55\u5728Scala\u4e2d\u521b\u5efa<code>Range<\/code>\uff1f<\/li>\n<li>\u5728Scala\u4e2d\uff0c\u7c7b\u578b\u4e3a<code>Nothing<\/code>\u7684\u503c\u6709\u591a\u5c11\u4e2a\uff1f\u5728Scala\u4e2d\uff0c\u7c7b\u578b\u4e3a<code>Unit<\/code>\u7684\u503c\u6709\u591a\u5c11\u4e2a\uff1f<\/li>\n<li>\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08FP\uff09\u4e2d\uff0c\u51fd\u6570\u548c\u8fc7\u7a0b\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/li>\n<li>Scala\u7684\u8f85\u52a9\u6784\u9020\u51fd\u6570\u548cJava\u7684\u6784\u9020\u51fd\u6570\u4e4b\u95f4\u7684\u4e3b\u8981\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>\u5728Scala\u7684<code>for-comprehension<\/code>\u7ed3\u6784\u4e2d\uff0c<code>yield<\/code>\u5173\u952e\u5b57\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>\u5728Scala\u7684<code>for-comprehension<\/code>\u7ed3\u6784\u4e2d\uff0cguard\uff08\u5b88\u536b\uff09\u662f\u4ec0\u4e48\uff1f<\/li>\n<li>Scala\u5982\u4f55\u6bd4Java 8\u66f4\u81ea\u52a8\u4e14\u66f4\u5bb9\u6613\u5730\u89e3\u51b3\u7ee7\u627f\u7684Diamond Problem\uff1f<\/li>\n<li>\u5728Scala\u4e2d\uff0c\u6a21\u5f0f\u5339\u914d\u9075\u5faa\u54ea\u79cd\u8bbe\u8ba1\u6a21\u5f0f\uff1f\u5728Java\u4e2d\uff0c<code>instanceof<\/code>\u8fd0\u7b97\u7b26\u9075\u5faa\u54ea\u79cd\u8bbe\u8ba1\u6a21\u5f0f\uff1f<\/li>\n<\/ol>\n<h3>Scala\u9762\u8bd5\u95ee\u9898\u4e0e\u7b54\u6848\u8be6\u89e3<\/h3>\n<p>\u672c\u8282\u5c06\u9010\u4e00\u89e3\u7b54\u4e0a\u8ff0\u95ee\u9898\uff0c\u5e76\u63d0\u4f9b\u8be6\u7ec6\u89e3\u91ca\u548c\u793a\u4f8b\u3002\u5982\u679c\u60a8\u5e0c\u671b\u6df1\u5165\u4e86\u89e3\u8fd9\u4e9b\u6982\u5ff5\u5e76\u67e5\u770b\u66f4\u591a\u793a\u4f8b\uff0c\u8bf7\u67e5\u9605\u6211\u4e4b\u524d\u5728Scala\u6559\u7a0b\u90e8\u5206\u53d1\u5e03\u7684\u6587\u7ae0\u3002<\/p>\n<h3>\u4e3b\u6784\u9020\u51fd\u6570\u662f\u4ec0\u4e48\uff1f\u5728Scala\u4e2d\uff0c\u8f85\u52a9\u6784\u9020\u51fd\u6570\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u8f85\u52a9\u6784\u9020\u51fd\u6570\u7684\u76ee\u7684\u662f\u4ec0\u4e48\uff1f\u5728Scala\u4e2d\u662f\u5426\u53ef\u4ee5\u91cd\u8f7d\u6784\u9020\u51fd\u6570\uff1f<\/h3>\n<p>Scala\u6709\u4e24\u79cd\u7c7b\u578b\u7684\u6784\u9020\u51fd\u6570\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u4e3b\u6784\u9020\u51fd\u6570\uff08Primary Constructor\uff09<\/li>\n<li>\u8f85\u52a9\u6784\u9020\u51fd\u6570\uff08Auxiliary Constructor\uff09<\/li>\n<\/ul>\n<p>\u5728Scala\u4e2d\uff0c\u4e3b\u6784\u9020\u51fd\u6570\u662f\u5728\u7c7b\u5b9a\u4e49\u672c\u8eab\u4e2d\u5b9a\u4e49\u7684\u6784\u9020\u51fd\u6570\u3002\u6bcf\u4e2a\u7c7b\u90fd\u5fc5\u987b\u6709\u4e00\u4e2a\u4e3b\u6784\u9020\u51fd\u6570\uff1a\u5b83\u53ef\u4ee5\u662f\u5e26\u53c2\u6570\u7684\u6784\u9020\u51fd\u6570\uff0c\u4e5f\u53ef\u4ee5\u662f\u65e0\u53c2\u6570\u7684\u6784\u9020\u51fd\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>class Person\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0<code>Person<\/code>\u7c7b\u6709\u4e00\u4e2a\u96f6\u53c2\u6570\uff08\u6216\u65e0\u53c2\u6570\uff09\u7684\u4e3b\u6784\u9020\u51fd\u6570\uff0c\u7528\u4e8e\u521b\u5efa\u8be5\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person (firstName: String, lastName: String)\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0<code>Person<\/code>\u7c7b\u6709\u4e00\u4e2a\u5e26\u6709\u4e24\u4e2a\u53c2\u6570\u7684\u4e3b\u6784\u9020\u51fd\u6570\u6765\u521b\u5efa\u8be5\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n<p>\u8f85\u52a9\u6784\u9020\u51fd\u6570\u4e5f\u88ab\u79f0\u4e3a\u6b21\u8981\u6784\u9020\u51fd\u6570\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>def<\/code>\u548c<code>this<\/code>\u5173\u952e\u5b57\u6765\u58f0\u660e\u8f85\u52a9\u6784\u9020\u51fd\u6570\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>class Person (firstName: String, middleName:String, lastName: String){\r\n  def this(firstName: String, lastName: String){\r\n      this(firstName, \"\", lastName)\r\n  }\r\n}\r\n<\/code><\/pre>\n<h3>\u5728Scala\u4e2d\uff0c\u8f85\u52a9\u6784\u9020\u51fd\u6570\u6709\u4ec0\u4e48\u7528\u9014\uff1f\u8bf7\u89e3\u91ca\u5b9a\u4e49\u8f85\u52a9\u6784\u9020\u51fd\u6570\u65f6\u9700\u8981\u9075\u5faa\u7684\u89c4\u5219\u3002<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u8f85\u52a9\u6784\u9020\u51fd\u6570\u7684\u4e3b\u8981\u76ee\u7684\u662f\u91cd\u8f7d\u6784\u9020\u51fd\u6570\u3002\u4e0eJava\u7c7b\u4f3c\uff0c\u6211\u4eec\u53ef\u4ee5\u63d0\u4f9b\u5404\u79cd\u4e0d\u540c\u7684\u6784\u9020\u51fd\u6570\uff0c\u4ee5\u4fbf\u7528\u6237\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u6784\u9020\u51fd\u6570\u3002<\/p>\n<p>\u8f85\u52a9\u6784\u9020\u51fd\u6570\u7684\u89c4\u5219\u5982\u4e0b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u5b83\u4eec\u7c7b\u4f3c\u4e8e\u65b9\u6cd5\u3002\u50cf\u65b9\u6cd5\u4e00\u6837\uff0c\u6211\u4eec\u5e94\u8be5\u4f7f\u7528<code>def<\/code>\u5173\u952e\u5b57\u6765\u5b9a\u4e49\u5b83\u4eec\u3002<\/li>\n<li>\u6240\u6709\u8f85\u52a9\u6784\u9020\u51fd\u6570\u90fd\u5e94\u4f7f\u7528\u76f8\u540c\u7684\u540d\u79f0<code>this<\/code>\u3002<\/li>\n<li>\u6bcf\u4e2a\u8f85\u52a9\u6784\u9020\u51fd\u6570\u90fd\u5fc5\u987b\u4ee5\u8c03\u7528\u4e4b\u524d\u5b9a\u4e49\u7684\u53e6\u4e00\u4e2a\u8f85\u52a9\u6784\u9020\u51fd\u6570\u6216\u4e3b\u6784\u9020\u51fd\u6570\u5f00\u59cb\uff0c\u5426\u5219\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/li>\n<li>\u6bcf\u4e2a\u8f85\u52a9\u6784\u9020\u51fd\u6570\u5fc5\u987b\u901a\u8fc7\u53c2\u6570\u5217\u8868\u8fdb\u884c\u533a\u5206\uff1a\u53ef\u4ee5\u662f\u53c2\u6570\u6570\u91cf\u6216\u7c7b\u578b\u4e0d\u540c\u3002<\/li>\n<li>\u8f85\u52a9\u6784\u9020\u51fd\u6570\u4e0d\u80fd\u76f4\u63a5\u8c03\u7528\u8d85\u7c7b\u6784\u9020\u51fd\u6570\u3002\u5b83\u4eec\u53ea\u80fd\u901a\u8fc7\u4e3b\u6784\u9020\u51fd\u6570\u6765\u8c03\u7528\u8d85\u7c7b\u6784\u9020\u51fd\u6570\u3002<\/li>\n<li>\u6240\u6709\u8f85\u52a9\u6784\u9020\u51fd\u6570\u90fd\u76f4\u63a5\u6216\u95f4\u63a5\uff08\u901a\u8fc7\u5176\u4ed6\u8f85\u52a9\u6784\u9020\u51fd\u6570\uff09\u8c03\u7528\u5b83\u4eec\u7684\u4e3b\u6784\u9020\u51fd\u6570\u3002<\/li>\n<\/ul>\n<p>\u6ce8\u610f\uff1a\u5982\u679c\u60a8\u60f3\u4e86\u89e3Scala\u7684\u6784\u9020\u51fd\u6570\uff0c\u8bf7\u53c2\u8003\u6211\u7684Scala\u6587\u7ae0\uff1a\u300a<a href=\"#\">\u4e3b\u6784\u9020\u51fd\u6570\u548c\u8f85\u52a9\u6784\u9020\u51fd\u6570<\/a>\u300b\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c<code>Array<\/code>\u548c<code>ArrayBuffer<\/code>\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p>Scala\u4e2d<code>Array<\/code>\u548c<code>ArrayBuffer<\/code>\u7684\u533a\u522b\u5982\u4e0b\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><code>Array<\/code>\u662f\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u7ec4\u3002\u4e00\u65e6\u521b\u5efa\uff0c\u6211\u4eec\u65e0\u6cd5\u6539\u53d8\u5176\u5927\u5c0f\u3002<\/li>\n<li><code>ArrayBuffer<\/code>\u662f\u53ef\u53d8\u5927\u5c0f\u7684\u6570\u7ec4\u3002\u5b83\u53ef\u4ee5\u52a8\u6001\u5730\u589e\u52a0\u6216\u51cf\u5c11\u5176\u5927\u5c0f\u3002<\/li>\n<li><code>Array<\/code>\u7c7b\u4f3c\u4e8eJava\u7684\u539f\u59cb\u6570\u7ec4\u3002<\/li>\n<li><code>ArrayBuffer<\/code>\u7c7b\u4f3c\u4e8eJava\u7684<code>ArrayList<\/code>\u3002<\/li>\n<\/ul>\n<h3>\u4ec0\u4e48\u662f\u6848\u4f8b\u7c7b\uff08<code>case class<\/code>\uff09\uff1f\u4ec0\u4e48\u662f\u6848\u4f8b\u5bf9\u8c61\uff08<code>case object<\/code>\uff09\uff1f\u6848\u4f8b\u7c7b\u6709\u54ea\u4e9b\u4f18\u70b9\uff1f<\/h3>\n<p>\u6848\u4f8b\u7c7b\u662f\u4f7f\u7528<code>case class<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u7684\u7c7b\u3002\u6848\u4f8b\u5bf9\u8c61\u662f\u4f7f\u7528<code>case object<\/code>\u5173\u952e\u5b57\u5b9a\u4e49\u7684\u5bf9\u8c61\u3002\u7531\u4e8e\u6709\u4e86\u8fd9\u4e2a<code>case<\/code>\u5173\u952e\u5b57\uff0c\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u7f16\u5199\u5927\u91cf\u7684\u6837\u677f\u4ee3\u7801\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528<code>new<\/code>\u5173\u952e\u5b57\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u6848\u4f8b\u7c7b\u5bf9\u8c61\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cScala\u7f16\u8bd1\u5668\u4f1a\u4e3a\u6240\u6709\u6784\u9020\u51fd\u6570\u53c2\u6570\u6dfb\u52a0<code>val<\/code>\u524d\u7f00\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5728\u4e0d\u4f7f\u7528<code>val<\/code>\u6216<code>var<\/code>\u7684\u60c5\u51b5\u4e0b\uff0c\u6848\u4f8b\u7c7b\u7684\u6784\u9020\u51fd\u6570\u53c2\u6570\u4f1a\u6210\u4e3a\u7c7b\u6210\u5458\uff0c\u800c\u8fd9\u5bf9\u4e8e\u666e\u901a\u7c7b\u6765\u8bf4\u662f\u4e0d\u53ef\u80fd\u7684\u3002<\/p>\n<p>\u6848\u4f8b\u7c7b\u7684\u4f18\u52bf\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cScala\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u6dfb\u52a0<code>toString<\/code>\u3001<code>hashCode<\/code>\u548c<code>equals<\/code>\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u7f16\u5199\u8fd9\u4e9b\u6837\u677f\u4ee3\u7801\u3002<\/li>\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cScala\u7f16\u8bd1\u5668\u4f1a\u6dfb\u52a0\u4e00\u4e2a\u4f34\u751f\u5bf9\u8c61\uff0c\u5176\u4e2d\u5305\u542b<code>apply<\/code>\u548c<code>unapply<\/code>\u65b9\u6cd5\uff0c\u56e0\u6b64\u6211\u4eec\u65e0\u9700\u4f7f\u7528<code>new<\/code>\u5173\u952e\u5b57\u6765\u521b\u5efa\u6848\u4f8b\u7c7b\u7684\u5b9e\u4f8b\u3002<\/li>\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cScala\u7f16\u8bd1\u5668\u8fd8\u4f1a\u6dfb\u52a0<code>copy<\/code>\u65b9\u6cd5\u3002<\/li>\n<li>\u6211\u4eec\u53ef\u4ee5\u5728\u6a21\u5f0f\u5339\u914d\u4e2d\u4f7f\u7528\u6848\u4f8b\u7c7b\u3002<\/li>\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6848\u4f8b\u7c7b\u548c\u6848\u4f8b\u5bf9\u8c61\u90fd\u662f\u53ef\u5e8f\u5217\u5316\u7684\u3002<\/li>\n<\/ul>\n<h3>\u6848\u4f8b\u5bf9\u8c61\uff08<code>Case Object<\/code>\uff09\u548c\u666e\u901a\u5bf9\u8c61\uff08<code>Object<\/code>\uff09\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<h2>Scala \u9762\u8bd5\u95ee\u9898\uff08\u7b2c2\u90e8\u5206\uff0c\u51714\u90e8\u5206\uff09<\/h2>\n<h3>\u666e\u901a\u5bf9\u8c61\u4e0e\u6848\u4f8b\u5bf9\u8c61\uff08Case Object\uff09\u7684\u533a\u522b<\/h3>\n<ul>\n<li>\u666e\u901a\u5bf9\u8c61\u4f7f\u7528 <code>object<\/code> \u5173\u952e\u5b57\u521b\u5efa\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5b83\u662f\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-scala\">object MyNormalObject\r\n<\/code><\/pre>\n<ul>\n<li>\u6848\u4f8b\u5bf9\u8c61\u4f7f\u7528 <code>case object<\/code> \u5173\u952e\u5b57\u521b\u5efa\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5b83\u4e5f\u662f\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-scala\">case object MyCaseObject\r\n<\/code><\/pre>\n<ul>\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6848\u4f8b\u5bf9\u8c61\u4f1a\u81ea\u52a8\u83b7\u5f97 <code>toString<\/code> \u548c <code>hashCode<\/code> \u65b9\u6cd5\uff0c\u800c\u666e\u901a\u5bf9\u8c61\u5219\u6ca1\u6709\u3002<\/li>\n<li>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6848\u4f8b\u5bf9\u8c61\u662f\u53ef\u5e8f\u5217\u5316\u7684\uff0c\u800c\u666e\u901a\u5bf9\u8c61\u5219\u4e0d\u662f\u3002<\/li>\n<\/ul>\n<h3>\u6848\u4f8b\u7c7b\uff08Case Class\uff09\u76f8\u5bf9\u4e8e\u666e\u901a\u7c7b\u7684\u4e3b\u8981\u4f18\u52bf\u6216\u597d\u5904\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u4ee5\u4e0b\u662f\u6848\u4f8b\u7c7b\u5728\u666e\u901a\u7c7b\u4e2d\u7684\u4e3b\u8981\u4f18\u70b9\u6216\u597d\u5904\uff1a<\/p>\n<ul>\n<li>\u901a\u8fc7\u81ea\u52a8\u6dfb\u52a0\u4e00\u4e9b\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u907f\u514d\u4e86\u5927\u91cf\u7684\u6837\u677f\u4ee3\u7801\u3002<\/li>\n<li>\u9ed8\u8ba4\u652f\u6301\u4e0d\u53ef\u53d8\u6027\uff0c\u56e0\u4e3a\u5176\u53c2\u6570\u662f <code>val<\/code> \u7c7b\u578b\u3002<\/li>\n<li>\u6613\u4e8e\u5728\u6a21\u5f0f\u5339\u914d\u4e2d\u4f7f\u7528\u3002<\/li>\n<li>\u521b\u5efa\u6848\u4f8b\u7c7b\u5b9e\u4f8b\u65f6\u65e0\u9700\u4f7f\u7528 <code>new<\/code> \u5173\u952e\u5b57\u3002<\/li>\n<li>\u9ed8\u8ba4\u652f\u6301\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u3002<\/li>\n<\/ul>\n<h3>\u5728Scala\u4e2d\uff0c<code>isInstanceOf<\/code> \u548c <code>asInstanceOf<\/code> \u65b9\u6cd5\u7684\u4f7f\u7528\u662f\u4ec0\u4e48\uff1f\u5728Java\u4e2d\u662f\u5426\u6709\u7c7b\u4f3c\u7684\u6982\u5ff5\uff1f<\/h3>\n<p><code>isInstanceOf<\/code> \u548c <code>asInstanceOf<\/code> \u65b9\u6cd5\u5b9a\u4e49\u5728 <code>Any<\/code> \u7c7b\u4e2d\u3002\u56e0\u6b64\uff0c\u65e0\u9700\u5bfc\u5165\u4efb\u4f55\u7c7b\u6216\u5bf9\u8c61\u5373\u53ef\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<p><code>isInstanceOf<\/code> \u65b9\u6cd5\u7528\u4e8e\u6d4b\u8bd5\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u7279\u5b9a\u7c7b\u578b\u3002\u5982\u679c\u662f\uff0c\u8fd4\u56de <code>true<\/code>\uff0c\u5426\u5219\u8fd4\u56de <code>false<\/code>\u3002<\/p>\n<pre><code class=\"language-scala\">scala&gt; val str = \"Hello\"\r\n   \r\nscala&gt; str.isInstanceOf[String]\r\nres0: Boolean = false   \r\n<\/code><\/pre>\n<p><code>asInstanceOf<\/code> \u65b9\u6cd5\u7528\u4e8e\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u6307\u5b9a\u7684\u7c7b\u578b\u3002\u5982\u679c\u7ed9\u5b9a\u7684\u5bf9\u8c61\u548c\u7c7b\u578b\u662f\u76f8\u540c\u7684\u7c7b\u578b\uff0c\u90a3\u4e48\u5b83\u5c06\u8f6c\u6362\u4e3a\u7ed9\u5b9a\u7684\u7c7b\u578b\u3002\u5426\u5219\uff0c\u5b83\u4f1a\u629b\u51fa <code>java.lang.ClassCastException<\/code> \u5f02\u5e38\u3002<\/p>\n<pre><code class=\"language-scala\">scala&gt; val str = \"Hello\".asInstanceOf[String]\r\nstr: String = Hello\r\n<\/code><\/pre>\n<p>\u5728Java\u4e2d\uff0c<code>instanceof<\/code> \u5173\u952e\u5b57\u7c7b\u4f3c\u4e8eScala\u7684 <code>isInstanceOf<\/code> \u65b9\u6cd5\u3002\u5728Java\u4e2d\uff0c\u4ee5\u4e0b\u8fd9\u79cd\u624b\u52a8\u7c7b\u578b\u8f6c\u6362\u4e0eScala\u7684 <code>asInstanceOf<\/code> \u65b9\u6cd5\u76f8\u4f3c\uff1a<\/p>\n<pre><code class=\"language-java\">AccountService service = (AccountService)\r\n context.getBean(\"accountService\");\r\n<\/code><\/pre>\n<h3>\u5982\u4f55\u8bc1\u660e\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6848\u4f8b\u5bf9\u8c61\u662f\u53ef\u5e8f\u5217\u5316\u7684\uff0c\u800c\u666e\u901a\u5bf9\u8c61\u5219\u4e0d\u53ef\u5e8f\u5217\u5316\uff1f<\/h3>\n<p>\u662f\u7684\uff0c\u6839\u636e\u9ed8\u8ba4\u8bbe\u7f6e\uff0c\u6848\u4f8b\u5bf9\u8c61\u662f\u53ef\u5e8f\u5217\u5316\u7684\uff0c\u800c\u666e\u901a\u5bf9\u8c61\u5219\u4e0d\u7136\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 <code>isInstanceOf<\/code> \u65b9\u6cd5\u6765\u8bc1\u660e\u8fd9\u4e00\u70b9\uff1a<\/p>\n<pre><code class=\"language-scala\">scala&gt; object MyNormalObject\r\ndefined object MyNormalObject\r\n\r\nscala&gt; MyNormalObject.isInstanceOf[Serializable]\r\nres0: Boolean = false\r\n\r\nscala&gt; case object MyCaseObject\r\ndefined object MyCaseObject\r\n\r\nscala&gt; MyCaseObject.isInstanceOf[Serializable]\r\nres1: Boolean = true\r\n<\/code><\/pre>\n<h3>\u5728Scala\u4e2d\uff0c\u6570\u7ec4\uff08Array\uff09\u548c\u5217\u8868\uff08List\uff09\u4e4b\u95f4\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h3>\n<ul>\n<li>\u6570\u7ec4\u603b\u662f\u53ef\u53d8\u7684\uff0c\u800c\u5217\u8868\u603b\u662f\u4e0d\u53ef\u53d8\u7684\u3002<\/li>\n<li>\u4e00\u65e6\u521b\u5efa\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u6539\u6570\u7ec4\u7684\u503c\uff0c\u800c\u5217\u8868\u5bf9\u8c61\u7684\u503c\u5219\u4e0d\u80fd\u66f4\u6539\u3002<\/li>\n<li>\u6570\u7ec4\u662f\u56fa\u5b9a\u5927\u5c0f\u7684\u6570\u636e\u7ed3\u6784\uff0c\u800c\u5217\u8868\u662f\u53ef\u53d8\u5927\u5c0f\u7684\u6570\u636e\u7ed3\u6784\u3002\u5217\u8868\u7684\u5927\u5c0f\u4f1a\u6839\u636e\u5bf9\u5176\u6267\u884c\u7684\u64cd\u4f5c\u81ea\u52a8\u589e\u52a0\u6216\u51cf\u5c11\u3002<\/li>\n<li>\u6570\u7ec4\u662f\u4e0d\u53d8\u7684\uff08Invariants\uff09\uff0c\u800c\u5217\u8868\u662f\u534f\u53d8\u7684\uff08Covariants\uff09\u3002<\/li>\n<\/ul>\n<p>\u5982\u679c\u4f60\u5bf9\u4e0d\u53d8\u548c\u534f\u53d8\u4e0d\u786e\u5b9a\uff0c\u8bf7\u9605\u8bfb\u6211\u5173\u4e8eScala\u9762\u8bd5\u95ee\u9898\u7684\u4e0b\u4e00\u7bc7\u535a\u6587\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c<code>val<\/code> \u548c <code>lazy val<\/code> \u6709\u4ec0\u4e48\u533a\u522b\uff1f\u4ec0\u4e48\u662f\u6025\u5207\u6c42\u503c\uff1f\u4ec0\u4e48\u662f\u5ef6\u8fdf\u6c42\u503c\uff1f<\/h3>\n<p>\u6b63\u5982\u6211\u4eec\u5728\u6211\u7684\u300aScala\u57fa\u7840\u9762\u8bd5\u95ee\u9898\u300b\u4e2d\u8ba8\u8bba\u7684\u90a3\u6837\uff0c<code>val<\/code> \u8868\u793a\u503c\u6216\u5e38\u91cf\uff0c\u7528\u4e8e\u5b9a\u4e49\u4e0d\u53ef\u53d8\u7684\u53d8\u91cf\u3002<\/p>\n<p>\u7a0b\u5e8f\u7684\u8bc4\u4f30\u5206\u4e3a\u4e24\u79cd\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li>\u6025\u5207\u6c42\u503c\uff08Eager Evaluation\uff09<\/li>\n<li>\u5ef6\u8fdf\u6c42\u503c\uff08Lazy Evaluation\uff09<\/li>\n<\/ul>\n<p>\u6025\u5207\u6c42\u503c\u610f\u5473\u7740\u5728\u7f16\u8bd1\u65f6\u6216\u7a0b\u5e8f\u90e8\u7f72\u65f6\u5bf9\u7a0b\u5e8f\u8fdb\u884c\u8bc4\u4f30\uff0c\u65e0\u8bba\u5ba2\u6237\u7aef\u662f\u5426\u4f7f\u7528\u8be5\u7a0b\u5e8f\u3002\u60f0\u6027\u6c42\u503c\u610f\u5473\u7740\u5728\u8fd0\u884c\u65f6\u6309\u9700\u8bc4\u4f30\u7a0b\u5e8f\uff0c\u4e5f\u5c31\u662f\u5f53\u5ba2\u6237\u7aef\u8bbf\u95ee\u7a0b\u5e8f\u65f6\u624d\u8fdb\u884c\u8bc4\u4f30\u3002<\/p>\n<p><code>val<\/code> \u548c <code>lazy val<\/code> \u4e4b\u95f4\u7684\u533a\u522b\u5728\u4e8e\uff0c<code>val<\/code> \u7528\u4e8e\u5b9a\u4e49\u6025\u5207\u6c42\u503c\u7684\u53d8\u91cf\uff0c\u800c <code>lazy val<\/code> \u4e5f\u7528\u4e8e\u5b9a\u4e49\u53d8\u91cf\uff0c\u4f46\u5b83\u4eec\u662f\u60f0\u6027\u6c42\u503c\u7684\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c<code>equals<\/code> \u65b9\u6cd5\u548c <code>==<\/code> \u4e4b\u95f4\u6709\u4ec0\u4e48\u5173\u7cfb\uff1f\u533a\u5206Scala\u7684 <code>==<\/code> \u8fd0\u7b97\u7b26\u548cJava\u7684 <code>==<\/code> \u8fd0\u7b97\u7b26\u3002<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u8c03\u7528 <code>equals()<\/code> \u65b9\u6cd5\u6765\u6bd4\u8f83\u4e24\u4e2a\u5b9e\u4f8b\u6216\u5bf9\u8c61\u3002\u5f53\u6211\u4eec\u7528 <code>==<\/code> \u6bd4\u8f83\u4e24\u4e2a\u5b9e\u4f8b\u65f6\uff0cScala\u4f1a\u81ea\u52a8\u8c03\u7528\u8be5\u5bf9\u8c61\u7684 <code>equals()<\/code> \u65b9\u6cd5\u3002<\/p>\n<p>Java\u7684 <code>==<\/code> \u8fd0\u7b97\u7b26\u7528\u4e8e\u68c0\u67e5\u5f15\u7528\u76f8\u7b49\u6027\uff0c\u5373\u4e24\u4e2a\u5f15\u7528\u662f\u5426\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002Scala\u7684 <code>==<\/code> \u8fd0\u7b97\u7b26\u7528\u4e8e\u68c0\u67e5\u5b9e\u4f8b\u76f8\u7b49\u6027\uff0c\u5373\u4e24\u4e2a\u5b9e\u4f8b\u662f\u5426\u76f8\u7b49\u3002<\/p>\n<h3>Scala \u5185\u90e8\u7c7b\u4e0e Java \u5185\u90e8\u7c7b\u4e4b\u95f4\u7684\u533a\u522b\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5728Java\u4e2d\uff0c\u5185\u90e8\u7c7b\u4e0e\u5916\u90e8\u7c7b\u76f8\u5173\u8054\uff0c\u5373\u5185\u90e8\u7c7b\u662f\u5916\u90e8\u7c7b\u7684\u4e00\u4e2a\u6210\u5458\u3002\u4e0eJava\u4e0d\u540c\uff0cScala\u5bf9\u5916\u90e8\u7c7b\u548c\u5185\u90e8\u7c7b\u4e4b\u95f4\u7684\u5173\u7cfb\u5904\u7406\u65b9\u5f0f\u4e0d\u540c\u3002Scala\u7684\u5185\u90e8\u7c7b\u4e0e\u5916\u90e8\u7c7b\u5bf9\u8c61\u76f8\u5173\u8054\u3002<\/p>\n<h3>\u94bb\u77f3\u95ee\u9898\uff08Diamond Problem\uff09\u662f\u4ec0\u4e48\uff1fScala\u5982\u4f55\u89e3\u51b3\u94bb\u77f3\u95ee\u9898\uff1f<\/h3>\n<div>\n  <img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656478d1a4b2f92e6c72ad11\/56-0.png\" alt=\"scala interview questions\" \/><\/p>\n<pre><code class=\"language-scala\">trait A{\r\n  def display(){ println(\"From A.display\")  }\r\n}\r\ntrait B extends A{\r\n  override def display() { println(\"From B.display\") }\r\n}\r\ntrait C extends A{\r\n  override def display() { println(\"From C.display\") }\r\n}\r\nclass D extends B with C{ }\r\n\r\nobject ScalaDiamonProblemTest extends App {\r\n    val d = new D\r\n    d display\r\n}\r\n<\/code><\/pre>\n<\/div>\n<p>\u8fd9\u91cc\u7684\u8f93\u51fa\u662f\u4ece\u7279\u8d28C\u4e2d\u7684 <code>C.display<\/code>\u3002Scala\u7f16\u8bd1\u5668\u4ece\u53f3\u5230\u5de6\u8bfb\u53d6 <code>extends B with C<\/code>\uff0c\u5e76\u4e14\u4ece\u6700\u53f3\u8fb9\u7684\u7279\u8d28 <code>C<\/code> \u4e2d\u83b7\u53d6 <code>display<\/code> \u65b9\u6cd5\u7684\u5b9a\u4e49\u3002<\/p>\n<p>\u6ce8\u610f\uff1a\u8bf7\u53c2\u9605\u6211\u5173\u4e8e\u201cScala\u7279\u8d28\u6df1\u5165\u89e3\u6790\u201d\u7684\u5e16\u5b50\uff0c\u4ee5\u4e86\u89e3\u6e05\u6670\u7684\u89e3\u91ca\u3002<\/p>\n<h3>\u4e3a\u4ec0\u4e48Scala\u6ca1\u6709 <code>static<\/code> \u5173\u952e\u5b57\uff1f\u8fd9\u4e2a\u51b3\u5b9a\u7684\u4e3b\u8981\u539f\u56e0\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u4f17\u6240\u5468\u77e5\uff0cScala\u6839\u672c\u6ca1\u6709 <code>static<\/code> \u5173\u952e\u5b57\u3002\u8fd9\u662fScala\u56e2\u961f\u505a\u51fa\u7684\u8bbe\u8ba1\u51b3\u7b56\u3002\u505a\u51fa\u8fd9\u4e2a\u51b3\u7b56\u7684\u4e3b\u8981\u539f\u56e0\u662f\u4f7fScala\u6210\u4e3a\u4e00\u4e2a\u7eaf\u7cb9\u7684\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u3002<\/p>\n<p><code>static<\/code> \u5173\u952e\u5b57\u610f\u5473\u7740\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u521b\u5efa\u5bf9\u8c61\u6216\u4f7f\u7528\u5bf9\u8c61\u7684\u60c5\u51b5\u4e0b\u8bbf\u95ee\u8be5\u7c7b\u6210\u5458\u3002\u8fd9\u5b8c\u5168\u8fdd\u80cc\u4e86\u9762\u5411\u5bf9\u8c61\u7684\u539f\u5219\u3002\u5982\u679c\u4e00\u79cd\u8bed\u8a00\u652f\u6301 <code>static<\/code> \u5173\u952e\u5b57\uff0c\u90a3\u4e48\u8fd9\u79cd\u8bed\u8a00\u5c31\u4e0d\u662f\u7eaf\u7cb9\u7684\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u3002\u4f8b\u5982\uff0cJava\u652f\u6301 <code>static<\/code> \u5173\u952e\u5b57\uff0c\u6240\u4ee5\u5b83\u4e0d\u662f\u4e00\u4e2a\u7eaf\u7cb9\u7684\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u3002\u4f46\u662fScala\u662f\u4e00\u4e2a\u7eaf\u7cb9\u7684\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c<code>object<\/code> \u5173\u952e\u5b57\u6709\u4ec0\u4e48\u7528\u9014\uff1f\u5982\u4f55\u5728Scala\u4e2d\u521b\u5efa\u5355\u4f8b\u5bf9\u8c61\uff1f<\/h3>\n<p>\uff08\u6b64\u5904\u539f\u6587\u7f3a\u5c11\u5bf9\u201cobject\u201d\u5173\u952e\u5b57\u7528\u9014\u548c\u5355\u4f8b\u5bf9\u8c61\u521b\u5efa\u7684\u8be6\u7ec6\u89e3\u91ca\uff0c\u5efa\u8bae\u8865\u5145\u5b8c\u6574\u3002\uff09<\/p>\n<h3>\u5728Scala\u4e2d\uff0c`object` \u5173\u952e\u5b57\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c`object` \u5173\u952e\u5b57\u4e3b\u8981\u7528\u4e8e\u4ee5\u4e0b\u76ee\u7684\uff1a<\/p>\n<ul>\n<li>\n<p><strong>\u521b\u5efa\u5355\u4f8b\u5bf9\u8c61\uff1a<\/strong> `object` \u5173\u952e\u5b57\u7528\u4e8e\u521b\u5efa\u5355\u4f8b\u5bf9\u8c61\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>object MySingletonObject\r\n<\/code><\/pre>\n<p>\u5728\u8fd9\u91cc\uff0c`MySingletonObject` \u81ea\u52a8\u6210\u4e3a\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5b9a\u4e49\u53ef\u6267\u884c\u7a0b\u5e8f\uff08Scala\u5e94\u7528\u7a0b\u5e8f\uff09\uff1a<\/strong> `object` \u5173\u952e\u5b57\u7528\u4e8e\u5b9a\u4e49\u53ef\u6267\u884c\u7684Scala\u7a0b\u5e8f\uff0c\u5373Scala\u5e94\u7528\u7a0b\u5e8f\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>object MyScalaExecutableProgram{\r\n   def main(args: Array[String]){\r\n       println(\"Hello World\")\r\n   }\r\n}\r\n<\/code><\/pre>\n<p>\u5f53\u6211\u4eec\u5728\u5bf9\u8c61\u4e2d\u5b9a\u4e49 `main` \u65b9\u6cd5\uff08\u4e0eJava\u4e2d\u7684 `main()` \u65b9\u6cd5\u76f8\u540c\uff09\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u5c06\u5176\u4f5c\u4e3a\u53ef\u6267\u884c\u7684Scala\u7a0b\u5e8f\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5b9a\u4e49\u9759\u6001\u6210\u5458\uff1a<\/strong> \u5b83\u7528\u4e8e\u5b9a\u4e49\u9759\u6001\u6210\u5458\uff0c\u5982\u9759\u6001\u53d8\u91cf\u548c\u9759\u6001\u65b9\u6cd5\uff0c\u800c\u65e0\u9700\u4f7f\u7528Java\u4e2d\u7684 `static` \u5173\u952e\u5b57\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>object MyScalaStaticMembers{\r\n  val PI: Double = 3.1414\r\n  def add(a: Int, b: Int) = a + b\r\n}\r\n<\/code><\/pre>\n<p>\u5728Scala\u4e2d\uff0c\u901a\u8fc7\u5c06 `PI` \u53d8\u91cf\u548c `add` \u65b9\u6cd5\u5b9a\u4e49\u4e3a\u9759\u6001\u6210\u5458\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u521b\u5efa\u989d\u5916\u5bf9\u8c61\u7684\u60c5\u51b5\u4e0b\u8c03\u7528\u5b83\u4eec\uff0c\u4f8b\u5982 `MyScalaStaticMembers.add(10, 20)`\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\uff1a<\/strong> \u5b83\u88ab\u7528\u4e8e\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\u3002\u8bf7\u53c2\u8003\u4e0b\u4e00\u4e2a\u95ee\u9898\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u5728Scala\u4e2d\u5982\u4f55\u4f7f\u7528 `object` \u5173\u952e\u5b57\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\uff1f\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\u6709\u4ec0\u4e48\u7528\u9014\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 `object` \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\u3002\u8fd9\u4e9bScala\u4e2d\u7684\u5de5\u5382\u65b9\u6cd5\u7684\u4e3b\u8981\u76ee\u7684\u662f\u907f\u514d\u4f7f\u7528 `new` \u5173\u952e\u5b57\u3002\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528 `new` \u5173\u952e\u5b57\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u5bf9\u8c61\u3002<\/p>\n<p><strong>\u8981\u5b9a\u4e49\u5de5\u5382\u65b9\u6cd5\uff1a<\/strong> \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 `apply` \u65b9\u6cd5\u6765\u5b9a\u4e49Scala\u4e2d\u7684\u5de5\u5382\u65b9\u6cd5\u3002\u5982\u679c\u6211\u4eec\u6709\u4e3b\u6784\u9020\u51fd\u6570\u548c\u591a\u4e2a\u8f85\u52a9\u6784\u9020\u51fd\u6570\uff0c\u5219\u9700\u8981\u5b9a\u4e49\u591a\u4e2a `apply` \u65b9\u6cd5\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>class Person(val firstName: String, val middleName: String, val lastName: String){\r\n  def this(firstName: String, lastName: String){\r\n    this(firstName,\"\",lastName)\r\n  }\r\n}\r\nobject Person{\r\n  def apply(firstName: String, middleName: String, lastName: String)\r\n        = new Person(firstName,middleName,lastName)\r\n\r\n  def apply(firstName: String, lastName: String)\r\n        = new Person(firstName, lastName)\r\n}\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528 `new` \u5173\u952e\u5b57\u7684\u60c5\u51b5\u4e0b\u521b\u5efa `Person` \u5bf9\u8c61\uff0c\u6216\u8005\u4f7f\u7528 `new` \u5173\u952e\u5b57\uff0c\u6839\u636e\u4f60\u7684\u610f\u613f\u6765\u51b3\u5b9a\u3002<\/p>\n<pre class=\"post-pre\"><code>val p1 = new Person(\"Scala\",\"Java\")\r\n\/\/ \u6216\u8005\r\nval p1 = Person(\"Scala\",\"Java\")\r\n<\/code><\/pre>\n<h3>Scala\u4e2d\u7684 `apply` \u65b9\u6cd5\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684 `unapply` \u65b9\u6cd5\u53c8\u662f\u4ec0\u4e48\uff1fScala\u4e2d\u7684 `apply` \u65b9\u6cd5\u548c `unapply` \u65b9\u6cd5\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c`apply` \u548c `unapply` \u65b9\u6cd5\u53d1\u6325\u7740\u975e\u5e38\u91cd\u8981\u7684\u4f5c\u7528\u3002\u5b83\u4eec\u4e5f\u5728Play\u6846\u67b6\u4e2d\u5728\u8868\u5355\u6570\u636e\u548c\u6a21\u578b\u6570\u636e\u4e4b\u95f4\u8fdb\u884c\u6620\u5c04\u548c\u89e3\u6620\u5c04\u65f6\u975e\u5e38\u6709\u7528\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u5b83\u4eec\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5728\u8868\u5355\u6570\u636e\u548c\u6a21\u578b\u6570\u636e\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u7684\u8f6c\u6362\u3002<\/p>\n<ul>\n<li>\n<p><strong>`apply` \u65b9\u6cd5\uff1a<\/strong> \u7528\u4e8e\u4ece\u7ec4\u4ef6\u7ec4\u5408\u6216\u7ec4\u88c5\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n<\/li>\n<li>\n<p><strong>`unapply` \u65b9\u6cd5\uff1a<\/strong> \u7528\u4e8e\u5c06\u5bf9\u8c61\u5206\u89e3\u6216\u62c6\u89e3\u6210\u5176\u7ec4\u4ef6\u3002<\/p>\n<\/li>\n<\/ul>\n<h4>Scala\u7684 `apply` \u65b9\u6cd5\uff1a<\/h4>\n<p>\u5b83\u7528\u4e8e\u901a\u8fc7\u4f7f\u7528\u5176\u7ec4\u4ef6\u6765\u7ec4\u5408\u4e00\u4e2a\u5bf9\u8c61\u3002\u5047\u8bbe\u6211\u4eec\u60f3\u521b\u5efa\u4e00\u4e2a `Person` \u5bf9\u8c61\uff0c\u90a3\u4e48\u53ef\u4ee5\u4f7f\u7528 `firstName` \u548c `lastName` \u4e24\u4e2a\u7ec4\u4ef6\uff0c\u6309\u7167\u4e0b\u9762\u7684\u793a\u4f8b\u6765\u7ec4\u5408 `Person` \u5bf9\u8c61\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person(val firstName: String, val lastName: String)\r\n\r\nobject Person{\r\n  def apply(firstName: String, lastName: String)\r\n        = new Person(firstName, lastName)\r\n}\r\n<\/code><\/pre>\n<h4>Scala\u7684 `unapply` \u65b9\u6cd5\uff1a<\/h4>\n<p>\u5b83\u7528\u4e8e\u5c06\u5bf9\u8c61\u5206\u89e3\u4e3a\u5176\u7ec4\u6210\u90e8\u5206\u3002\u5b83\u9075\u5faa `apply` \u65b9\u6cd5\u7684\u76f8\u53cd\u8fc7\u7a0b\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a `Person` \u5bf9\u8c61\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u5c06\u8fd9\u4e2a\u5bf9\u8c61\u5206\u89e3\u4e3a\u5176\u4e24\u4e2a\u7ec4\u6210\u90e8\u5206\uff1a`firstName` \u548c `lastName`\uff0c\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code>class Person(val firstName: String, val lastName: String)\r\n\r\nobject Person{\r\n  def apply(firstName: String, lastName: String)\r\n        = new Person(firstName, lastName)\r\n\r\n  def unapply(p: Person): Option[(String,String)]\r\n        = Some((p.firstName, p.lastName))\r\n}\r\n<\/code><\/pre>\n<h3>\u5728Scala\u4e2d\uff0c\u5728\u6ca1\u6709\u4f7f\u7528 `new` \u5173\u952e\u5b57\u521b\u5efa\u7c7b\u7684\u5b9e\u4f8b\u65f6\uff0c\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f\u6211\u4eec\u4ec0\u4e48\u65f6\u5019\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\uff1f\u5982\u4f55\u5728Scala\u4e2d\u58f0\u660e\u79c1\u6709\u6784\u9020\u51fd\u6570\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u65f6\uff0c\u5982\u679c\u4e0d\u4f7f\u7528 `new` \u5173\u952e\u5b57\uff0c\u5b83\u4f1a\u5728\u4f34\u751f\u5bf9\u8c61\u4e2d\u8c03\u7528\u76f8\u5e94\u7684 `apply` \u65b9\u6cd5\u3002\u8fd9\u91cc\u7684\u201c\u9002\u5f53\u7684 `apply` \u65b9\u6cd5\u201d\u6307\u7684\u662f\u4e0e\u53c2\u6570\u5339\u914d\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u6211\u4eec\u9009\u62e9\u8fd9\u4e2a\u9009\u9879\u7684\u65f6\u673a\u662f\uff1a\u5f53\u6211\u4eec\u9700\u8981\u63d0\u4f9b\u79c1\u6709\u6784\u9020\u51fd\u6570\u5e76\u4e14\u9700\u8981\u907f\u514d\u4f7f\u7528 `new` \u5173\u952e\u5b57\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u53ea\u5b9e\u73b0\u5177\u6709\u76f8\u540c\u53c2\u6570\u96c6\u7684 `apply` \u65b9\u6cd5\uff0c\u4ece\u800c\u5141\u8bb8\u6211\u4eec\u7684\u7c7b\u7684\u7528\u6237\u5728\u4e0d\u4f7f\u7528 `new` \u5173\u952e\u5b57\u7684\u60c5\u51b5\u4e0b\u521b\u5efa\u5b83\u3002<\/p>\n<h3>\u6211\u4eec\u5982\u4f55\u5728Scala\u4e2d\u58f0\u660e\u4e00\u4e2a\u79c1\u6709\u7684\u4e3b\u6784\u9020\u51fd\u6570\uff1f\u6211\u4eec\u5982\u4f55\u8c03\u7528Scala\u4e2d\u7684\u79c1\u6709\u4e3b\u6784\u9020\u51fd\u6570\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u975e\u5e38\u5bb9\u6613\u5730\u58f0\u660e\u4e00\u4e2a\u79c1\u6709\u7684\u4e3b\u6784\u9020\u51fd\u6570\u3002\u53ea\u9700\u5c06\u4e3b\u6784\u9020\u51fd\u6570\u5b9a\u4e49\u4e3a\u539f\u6837\uff0c\u5e76\u5728\u7c7b\u540d\u4e4b\u540e\u548c\u53c2\u6570\u5217\u8868\u4e4b\u524d\u6dfb\u52a0 `private` \u5173\u952e\u5b57\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>class Person private (name: String)\r\nobject Person{\r\n def apply(name: String) = new Person(name)\r\n}\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u5b83\u662f\u4e00\u4e2a\u79c1\u6709\u6784\u9020\u51fd\u6570\uff0c\u6211\u4eec\u65e0\u6cd5\u4ece\u5916\u90e8\u76f4\u63a5\u8c03\u7528\u5b83\u3002\u6211\u4eec\u5e94\u8be5\u63d0\u4f9b\u4e00\u4e2a\u5de5\u5382\u65b9\u6cd5\uff08\u5373 `apply` \u65b9\u6cd5\uff09\uff0c\u5e76\u95f4\u63a5\u4f7f\u7528\u8be5\u6784\u9020\u51fd\u6570\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c\u4f34\u751f\u5bf9\u8c61\u80fd\u5426\u8bbf\u95ee\u5176\u4f34\u751f\u7c7b\u7684\u79c1\u6709\u6210\u5458\uff1f<\/h3>\n<p>\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u79c1\u6709\u6210\u5458\u6307\u7684\u662f\u53ea\u80fd\u5728\u8be5\u7c7b\u5185\u90e8\u8bbf\u95ee\u3002\u7136\u800c\uff0cScala\u7684\u4f34\u751f\u7c7b\u548c\u4f34\u751f\u5bf9\u8c61\u63d0\u4f9b\u4e86\u53e6\u4e00\u4e2a\u529f\u80fd\u3002\u5728Scala\u4e2d\uff0c\u4f34\u751f\u5bf9\u8c61\u53ef\u4ee5\u8bbf\u95ee\u5176\u4f34\u751f\u7c7b\u7684\u79c1\u6709\u6210\u5458\uff0c\u800c\u4f34\u751f\u7c7b\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u5176\u4f34\u751f\u5bf9\u8c61\u7684\u79c1\u6709\u6210\u5458\u3002<\/p>\n<h3>\u5728Scala\u4e2d\uff0c\u5173\u4e8e\u4e24\u4e2a\u4e0d\u540c\u5173\u952e\u8bcd\uff08`class` \u548c `object`\uff09\u7684\u4e3b\u8981\u8bbe\u8ba1\u51b3\u7b56\u662f\u4ec0\u4e48\uff1f\u6211\u4eec\u5982\u4f55\u5b9a\u4e49Scala\u4e2d\u7684\u5b9e\u4f8b\u6210\u5458\u548c\u9759\u6001\u6210\u5458\uff1f<\/h3>\n<p>\u5728Scala\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528 `class` \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u5b9e\u4f8b\u6210\u5458\uff0c\u4f7f\u7528 `object` \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u9759\u6001\u6210\u5458\u3002Scala\u6ca1\u6709 `static` \u5173\u952e\u5b57\uff0c\u4f46\u6211\u4eec\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 `object` \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u5b83\u4eec\u3002\u8fd9\u4e2a\u8bbe\u8ba1\u7684\u4e3b\u8981\u51b3\u7b56\u662f\u4e3a\u4e86\u6e05\u6670\u5730\u533a\u5206\u5b9e\u4f8b\u548c\u9759\u6001\u6210\u5458\uff0c\u5b9e\u73b0\u5b83\u4eec\u4e4b\u95f4\u7684\u677e\u8026\u5408\u3002\u53e6\u4e00\u4e2a\u91cd\u8981\u539f\u56e0\u662f\u4e3a\u4e86\u907f\u514d\u4f7f\u7528 `static` \u5173\u952e\u5b57\uff0c\u4f7fScala\u6210\u4e3a\u4e00\u79cd\u7eaf\u9762\u5411\u5bf9\u8c61\u7684\u8bed\u8a00\u3002<\/p>\n<h3>Scala\u4e2d\u7684\u201c\u5bf9\u8c61\u201d\u662f\u4ec0\u4e48\uff1f\u5b83\u662f\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\u8fd8\u662f\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff1f<\/h3>\n<p>\u4e0eJava\u4e0d\u540c\uff0cScala\u5bf9\u201c\u5bf9\u8c61\u201d\u6709\u4e24\u4e2a\u542b\u4e49\u3002\u4e0d\u8981\u5bf9\u6b64\u611f\u5230\u56f0\u60d1\uff0c\u6211\u4f1a\u6e05\u695a\u5730\u89e3\u91ca\u3002\u5728Java\u4e2d\uff0c\u6211\u4eec\u53ea\u6709\u4e00\u4e2a\u5173\u4e8e\u5bf9\u8c61\u7684\u542b\u4e49\uff0c\u5373\u201c\u7c7b\u7684\u5b9e\u4f8b\u201d\u3002<\/p>\n<ul>\n<li>\n<p><strong>\u542b\u4e49\u4e00\uff1a\u7c7b\u7684\u5b9e\u4f8b\u3002<\/strong> \u50cfJava\u4e00\u6837\uff0c\u5bf9\u8c61\u7684\u7b2c\u4e00\u5c42\u542b\u4e49\u662f\u201c\u7c7b\u7684\u5b9e\u4f8b\u201d\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>val p1 = new Person(\"Scala\",\"Java\")\r\n\/\/ \u6216\u8005\r\nval p1 = Person(\"Scala\",\"Java\")\r\n<\/code><\/pre>\n<\/li>\n<li>\n<p><strong>\u542b\u4e49\u4e8c\uff1a`object` \u5173\u952e\u5b57\u3002<\/strong> \u7b2c\u4e8c\u5c42\u542b\u4e49\u662f `object` \u662fScala\u4e2d\u7684\u4e00\u4e2a\u5173\u952e\u5b57\u3002\u5b83\u7528\u4e8e\u5b9a\u4e49Scala\u53ef\u6267\u884c\u7a0b\u5e8f\u3001\u4f34\u751f\u5bf9\u8c61\u3001\u5355\u4f8b\u5bf9\u8c61\u7b49\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u5728Scala\u4e2d\uff0c\u4f34\u751f\u5bf9\u8c61\u662f\u4ec0\u4e48\uff1f\u5728Scala\u4e2d\uff0c\u4f34\u751f\u7c7b\u662f\u4ec0\u4e48\uff1f\u4f34\u751f\u5bf9\u8c61\u5728Scala\u4e2d\u7684\u7528\u9014\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u7b80\u800c\u8a00\u4e4b\uff0c\u5982\u679c\u4e00\u4e2aScala\u7c7b\u548c\u5bf9\u8c61\u5177\u6709\u76f8\u540c\u7684\u540d\u79f0\u5e76\u4e14\u5728\u540c\u4e00\u4e2a\u6e90\u6587\u4ef6\u4e2d\u5b9a\u4e49\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7c7b\u88ab\u79f0\u4e3a\u201c\u4f34\u751f\u7c7b\u201d\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u88ab\u79f0\u4e3a\u201c\u4f34\u751f\u5bf9\u8c61\u201d\u3002\u5f53\u6211\u4eec\u4f7f\u7528Scala\u7684 `class` \u5173\u952e\u5b57\u521b\u5efa\u4e00\u4e2a\u7c7b\uff0c\u5e76\u4f7f\u7528\u76f8\u540c\u7684\u540d\u79f0\u548c\u540c\u4e00\u4e2a\u6e90\u6587\u4ef6\u4e2d\u7684Scala `object` \u5173\u952e\u5b57\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7c7b\u88ab\u79f0\u4e3a\u201c\u4f34\u751f\u7c7b\u201d\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u88ab\u79f0\u4e3a\u201c\u4f34\u751f\u5bf9\u8c61\u201d\u3002<\/p>\n<p><strong>\u4f8b\u5b50\uff1a<\/strong> `Employee.scala`<\/p>\n<pre class=\"post-pre\"><code>class Employee{ }\r\nobject Employee{ }\r\n<\/code><\/pre>\n<p>\u5728Scala\u4e2d\uff0c\u4f34\u751f\u5bf9\u8c61\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5b9a\u4e49 `apply` \u65b9\u6cd5\uff0c\u907f\u514d\u4f7f\u7528 `new` \u5173\u952e\u5b57\u6765\u521b\u5efa\u8be5\u4f34\u751f\u7c7b\u5bf9\u8c61\u7684\u5b9e\u4f8b\u3002<\/p>\n<h3>\u5728Scala\u4e2d\u5982\u4f55\u5b9e\u73b0\u63a5\u53e3\uff1f<\/h3>\n<p>\u6b63\u5982\u6211\u4eec\u4eceJava\u80cc\u666f\u4e2d\u6240\u4e86\u89e3\u7684\u90a3\u6837\uff0c\u6211\u4eec\u4f7f\u7528\u63a5\u53e3\u6765\u5b9a\u4e49\u5951\u7ea6\u3002\u7136\u800c\uff0c\u5728Scala\u4e2d\u6ca1\u6709\u63a5\u53e3\u7684\u6982\u5ff5\u3002\u751a\u81f3\uff0cScala\u4e5f\u6ca1\u6709 `interface` \u5173\u952e\u5b57\u3002Scala\u6709\u4e00\u4e2a\u66f4\u5f3a\u5927\u548c\u7075\u6d3b\u7684\u6982\u5ff5\uff0c\u5373\u7279\u8d28\uff08trait\uff09\u7528\u4e8e\u6b64\u76ee\u7684\u3002<\/p>\n<h3>Scala\u4e2d\u7684Range\u662f\u4ec0\u4e48\uff1f\u5982\u4f55\u521b\u5efaScala\u4e2d\u7684Range?<\/h3>\n<h3>Scala \u4e2d\u7684 Range\uff08\u8303\u56f4\uff09\u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>Range \u662f Scala \u4e2d\u7684\u4e00\u79cd\u60f0\u6027\u96c6\u5408\u3002\u5b83\u662f\u4e00\u4e2a\u7c7b\u4f3c\u4e8e `scala.Range` \u7684\u7c7b\uff0c\u53ef\u4ee5\u5728 `scala` \u5305\u4e2d\u4f7f\u7528\u3002\u5b83\u7528\u4e8e\u8868\u793a\u6574\u6570\u5e8f\u5217\uff0c\u662f\u4e00\u4e2a\u6709\u5e8f\u7684\u6574\u6570\u5e8f\u5217\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>scala&gt; 1 to 10\r\nres0: scala.collection.immutable.Range.Inclusive = Range(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)\r\n\r\nscala&gt; 1 until 10\r\nres1: scala.collection.immutable.Range = Range(1, 2, 3, 4, 5, 6, 7, 8, 9)\r\n<\/code><\/pre>\n<h3>Scala \u4e2d\u6709\u591a\u5c11\u4e2a\u7c7b\u578b\u4e3a Nothing \u7684\u503c\uff1f<\/h3>\n<p>\u5728 Scala \u4e2d\uff0c`Nothing` \u7c7b\u578b\u6ca1\u6709\u201c\u96f6\u503c\u201d\uff08\u6216\u4efb\u4f55\u503c\uff09\u3002\u5b83\u4e0d\u5305\u542b\u4efb\u4f55\u5177\u4f53\u7684\u503c\u3002\u5b83\u662f\u6240\u6709\u503c\u7c7b\u578b\uff08Value Class\uff09\u548c\u5f15\u7528\u7c7b\u578b\uff08Reference Class\uff09\u7684\u5b50\u7c7b\u578b\u3002<\/p>\n<h3>Scala \u4e2d\u6709\u591a\u5c11\u4e2a Unit \u7c7b\u578b\u7684\u503c\uff1f<\/h3>\n<p>\u5728 Scala \u4e2d\uff0c`Unit` \u7c7b\u4f3c\u4e8e Java \u7684 `void` \u5173\u952e\u5b57\u3002\u5b83\u7528\u4e8e\u8868\u793a\u201c\u6ca1\u6709\u503c\u5b58\u5728\u201d\u3002\u5b83\u53ea\u6709\u4e00\u4e2a\u503c\uff0c\u5373 `()`\u3002<\/p>\n<h3>\u4ec0\u4e48\u662f\u7eaf\u51fd\u6570\uff1f<\/h3>\n<p>\u4e00\u4e2a\u7eaf\u51fd\u6570\u662f\u4e00\u4e2a\u6ca1\u6709\u4efb\u4f55\u53ef\u89c2\u5bdf\u526f\u4f5c\u7528\u7684\u51fd\u6570\u3002\u8fd9\u610f\u5473\u7740\u65e0\u8bba\u6211\u4eec\u4ee5\u76f8\u540c\u7684\u8f93\u5165\u8c03\u7528\u5b83\u591a\u5c11\u6b21\uff0c\u5b83\u90fd\u4f1a\u59cb\u7ec8\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\u3002\u4e00\u4e2a\u7eaf\u51fd\u6570\u5bf9\u4e8e\u76f8\u540c\u7684\u8f93\u5165\u59cb\u7ec8\u7ed9\u51fa\u76f8\u540c\u7684\u8f93\u51fa\u3002\u4f8b\u5982\uff1a<\/p>\n<pre class=\"post-pre\"><code>scala&gt; 10 + 20\r\nres0: Int = 30\r\nscala&gt;\r\nscala&gt; 10 + 20\r\nres0: Int = 30\r\n<\/code><\/pre>\n<p>\u8fd9\u91cc\u7684\u201c+\u201d\u662f `Int` \u7c7b\u4e2d\u53ef\u7528\u7684\u4e00\u4e2a\u7eaf\u51fd\u6570\u3002\u5b83\u5bf9\u4e8e\u76f8\u540c\u7684\u8f93\u5165 `10` \u548c `20`\uff0c\u65e0\u8bba\u6211\u4eec\u8c03\u7528\u591a\u5c11\u6b21\uff0c\u90fd\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u7ed3\u679c `30`\u3002<\/p>\n<h3>\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08FP\uff09\u4e2d\uff0c\u51fd\u6570\u548c\u8fc7\u7a0b\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n<p>\u5728\u51fd\u6570\u5f0f\u7f16\u7a0b\u9886\u57df\uff0c\u51fd\u6570\u548c\u8fc7\u7a0b\u90fd\u7528\u4e8e\u6267\u884c\u8ba1\u7b97\uff0c\u4f46\u5b83\u4eec\u6709\u4e00\u4e2a\u4e3b\u8981\u533a\u522b\u3002\u51fd\u6570\u662f\u4e00\u4e2a\u6ca1\u6709\u526f\u4f5c\u7528\u7684\u8ba1\u7b97\u5355\u5143\uff0c\u800c\u8fc7\u7a0b\u662f\u4e00\u4e2a\u6709\u526f\u4f5c\u7528\u7684\u8ba1\u7b97\u5355\u5143\u3002<\/p>\n<h3>Scala \u7684\u8f85\u52a9\u6784\u9020\u51fd\u6570\u4e0e Java \u7684\u6784\u9020\u51fd\u6570\u4e4b\u95f4\u6709\u54ea\u4e9b\u4e3b\u8981\u533a\u522b\uff1f<\/h3>\n<p>\u5728 Scala \u4e2d\uff0c\u8f85\u52a9\u6784\u9020\u51fd\u6570\u4e0e Java \u7684\u6784\u9020\u51fd\u6570\u51e0\u4e4e\u76f8\u4f3c\uff0c\u53ea\u6709\u4e00\u4e9b\u4e0d\u540c\u4e4b\u5904\u3002\u4e0e Java \u7684\u6784\u9020\u51fd\u6570\u76f8\u6bd4\uff0c\u8f85\u52a9\u6784\u9020\u51fd\u6570\u6709\u4ee5\u4e0b\u51e0\u4e2a\u4e0d\u540c\u70b9\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u8f85\u52a9\u6784\u9020\u51fd\u6570\u4f7f\u7528 `this` \u5173\u952e\u5b57\u8c03\u7528\u3002<\/li>\n<li>\u6240\u6709\u8f85\u52a9\u6784\u9020\u51fd\u6570\u90fd\u4f7f\u7528\u76f8\u540c\u7684\u540d\u79f0 `this` \u5b9a\u4e49\u3002\u800c\u5728 Java \u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u7c7b\u540d\u6765\u5b9a\u4e49\u6784\u9020\u51fd\u6570\u3002<\/li>\n<li>\u6bcf\u4e2a\u8f85\u52a9\u6784\u9020\u51fd\u6570\u5fc5\u987b\u4ee5\u8c03\u7528\u4e4b\u524d\u5b9a\u4e49\u7684\u8f85\u52a9\u6784\u9020\u51fd\u6570\u6216\u4e3b\u6784\u9020\u51fd\u6570\u5f00\u59cb\u3002<\/li>\n<li>\u6211\u4eec\u4f7f\u7528 `def` \u5173\u952e\u5b57\u6765\u5b9a\u4e49\u8f85\u52a9\u6784\u9020\u51fd\u6570\uff0c\u5c31\u50cf\u5b9a\u4e49\u65b9\u6cd5\/\u51fd\u6570\u4e00\u6837\u3002\u5728 Java \u4e2d\uff0c\u6784\u9020\u51fd\u6570\u7684\u5b9a\u4e49\u548c\u65b9\u6cd5\u7684\u5b9a\u4e49\u662f\u4e0d\u540c\u7684\u3002<\/li>\n<\/ul>\n<h3>\u5728 Scala \u7684 `for-comprehension` \u7ed3\u6784\u4e2d\uff0c\u201cyield\u201d\u5173\u952e\u5b57\u6709\u4ec0\u4e48\u7528\u9014\uff1f<\/h3>\n<p>\u5728 Scala \u7684 `for` \u5faa\u73af\u6784\u9020\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 `yield` \u5173\u952e\u5b57\u3002`for\/yield` \u7528\u4e8e\u8fed\u4ee3\u4e00\u7ec4\u5143\u7d20\u5e76\u751f\u6210\u76f8\u540c\u7c7b\u578b\u7684\u65b0\u96c6\u5408\u3002\u5b83\u4e0d\u6539\u53d8\u539f\u59cb\u96c6\u5408\uff0c\u800c\u662f\u751f\u6210\u4e0e\u539f\u59cb\u96c6\u5408\u7c7b\u578b\u76f8\u540c\u7684\u65b0\u96c6\u5408\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u4f7f\u7528 `for\/yield` \u6784\u9020\u6765\u8fed\u4ee3\u4e00\u4e2a\u5217\u8868\uff0c\u5b83\u53ea\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5217\u8868\u3002<\/p>\n<pre class=\"post-pre\"><code>scala&gt; val list = List(1,2,3,4,5)\r\nlist: List[Int] = List(1, 2, 3, 4, 5)\r\n\r\nscala&gt; for(l &lt;- list) yield l*2\r\nres0: List[Int] = List(2, 4, 6, 8, 10)\r\n<\/code><\/pre>\n<h3>\u5728 Scala \u7684 `for-comprehension` \u6784\u9020\u4e2d\uff0c`guard` \u662f\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5728 Scala \u4e2d\uff0c`for` \u5faa\u73af\u6784\u9020\u5305\u542b\u4e00\u4e2a `if` \u5b50\u53e5\uff0c\u7528\u4e8e\u7f16\u5199\u6761\u4ef6\u4ee5\u8fc7\u6ee4\u4e00\u4e9b\u5143\u7d20\u5e76\u751f\u6210\u65b0\u7684\u96c6\u5408\u3002\u8fd9\u4e2a `if` \u5b50\u53e5\u4e5f\u88ab\u79f0\u4e3a\u201c\u5b88\u536b\u201d\uff08Guard\uff09\u3002\u5982\u679c\u8be5\u5b88\u536b\u4e3a `true`\uff0c\u5219\u5c06\u8be5\u5143\u7d20\u6dfb\u52a0\u5230\u65b0\u96c6\u5408\u4e2d\u3002\u5426\u5219\uff0c\u5b83\u4e0d\u4f1a\u5c06\u8be5\u5143\u7d20\u6dfb\u52a0\u5230\u539f\u59cb\u96c6\u5408\u4e2d\u3002\u793a\u4f8b\uff1a\u4f7f\u7528 `for` \u5faa\u73af\u5b88\u536b\u751f\u6210\u4ec5\u5305\u542b\u5076\u6570\u7684\u65b0\u96c6\u5408\u3002<\/p>\n<pre class=\"post-pre\"><code>scala&gt; val list = List(1,2,3,4,5,6,7,8,9,10)\r\nlist: List[Int] = List(1, 2, 3, 4, 5 , 6 , 7 , 8 , 9 , 10)\r\n\r\nscala&gt; for(l &lt;- list if l % 2 == 0 ) yield l\r\nres0: List[Int] = List(2, 4, 6, 8, 10)\r\n<\/code><\/pre>\n<h3>Scala \u5982\u4f55\u6bd4 Java 8 \u66f4\u81ea\u52a8\u4e14\u66f4\u5bb9\u6613\u5730\u89e3\u51b3\u7ee7\u627f\u83f1\u5f62\u95ee\u9898\uff1f<\/h3>\n<p>\u5982\u679c\u6211\u4eec\u5728 Java 8 \u4e2d\u4f7f\u7528\u5e26\u6709\u9ed8\u8ba4\u65b9\u6cd5\u7684\u63a5\u53e3\uff0c\u6211\u4eec\u5c06\u4f1a\u9047\u5230\u7ee7\u627f\u83f1\u5f62\u95ee\u9898\u3002\u5f00\u53d1\u4eba\u5458\u5fc5\u987b\u5728 Java 8 \u4e2d\u624b\u52a8\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002\u5b83\u4e0d\u63d0\u4f9b\u9ed8\u8ba4\u6216\u81ea\u52a8\u89e3\u51b3\u6b64\u95ee\u9898\u7684\u65b9\u5f0f\u3002\u5728 Scala \u4e2d\uff0c\u6211\u4eec\u4f1a\u9047\u5230\u4e0e\u7279\u8d28\uff08Trait\uff09\u76f8\u540c\u7684\u95ee\u9898\uff0c\u4f46 Scala \u975e\u5e38\u806a\u660e\uff0c\u4f7f\u7528\u7c7b\u7ebf\u6027\u5316\uff08Class Linearization\uff09\u6982\u5ff5\u81ea\u52a8\u89e3\u51b3\u4e86\u7ee7\u627f\u83f1\u5f62\u95ee\u9898\u3002<\/p>\n<h3>\u5728 Scala \u4e2d\uff0c\u6a21\u5f0f\u5339\u914d\u9075\u5faa\u54ea\u4e2a\u8bbe\u8ba1\u6a21\u5f0f\uff1f\u5728 Java \u4e2d\uff0c`instanceof` \u8fd0\u7b97\u7b26\u9075\u5faa\u54ea\u4e2a\u8bbe\u8ba1\u6a21\u5f0f\uff1f<\/h3>\n<p>\u5728 Scala \u4e2d\uff0c\u6a21\u5f0f\u5339\u914d\u9075\u5faa\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\uff08Visitor Design Pattern\uff09\u3002\u540c\u6837\u5730\uff0cJava \u7684 `instanceof` \u8fd0\u7b97\u7b26\u4e5f\u9075\u5faa\u8bbf\u95ee\u8005\u8bbe\u8ba1\u6a21\u5f0f\u3002\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8e\u201cScala \u4e2d\u7ea7\u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848\u201d\u7684\u5168\u90e8\u5185\u5bb9\u3002\u5728\u6211\u7684\u540e\u7eed\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u8ba8\u8bba\u4e00\u4e9b\u9ad8\u7ea7 Scala \u9762\u8bd5\u95ee\u9898\u548c\u7b54\u6848\u3002\u5982\u679c\u4f60\u559c\u6b22\u6211\u7684\u6587\u7ae0\u6216\u6709\u4efb\u4f55\u95ee\u9898\/\u5efa\u8bae\uff0c\u8bf7\u7ed9\u6211\u7559\u8a00\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scala\u9762\u8bd5\u95ee\u9898\uff1a\u4e2d\u7ea7\u4e0e\u9ad8\u7ea7\uff08\u7b2c\u4e00\u90e8\u5206\uff09 \u5728\u6df1\u5165\u9605\u8bfb\u672c\u6587\u4e4b\u524d\uff0c\u5efa\u8bae\u60a8\u5148\u67e5\u9605\u6211\u7684\u4e0a\u4e00\u7bc7\u6587\u7ae0\u300aScala\u57fa\u7840\u9762\u8bd5 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[794,793,333,795,745],"class_list":{"0":"post-200","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-scala","9":"tag-333","10":"tag-795","11":"tag-745"},"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\u6280\u5de7\u89e3\u6790 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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