{"rsdb":{"rid":"377770","subhead":"","postdate":"0","aid":"264306","fid":"90","uid":"1","topic":"1","content":"<div id=\"cnblogs_post_body\" class=\"blogpost-body cnblogs-markdown\"> \n <h1 id=\"\u7c7b\u548c\u5bf9\u8c61\">\u7c7b\u548c\u5bf9\u8c61<\/h1> \n <p><strong>\u7ec4\u6210\u7ed3\u6784<\/strong><br \/> ? \u6784\u9020\u51fd\u6570: \u5728\u521b\u5efa\u5bf9\u8c61\u7684\u65f6\u5019\u7ed9\u5c5e\u6027\u8d4b\u503c<br \/> ? \u6210\u5458\u53d8\u91cf:<br \/> ? \u6210\u5458\u65b9\u6cd5(\u51fd\u6570)<br \/> ? \u5c40\u90e8\u53d8\u91cf<br \/> ? \u4ee3\u7801\u5757<\/p> \n <h2 id=\"\u6784\u9020\u5668\">\u6784\u9020\u5668<\/h2> \n <p>\u6bcf\u4e2a\u7c7b\u90fd\u6709\u4e00\u4e2a\u4e3b\u6784\u9020\u5668\uff0c\u8fd9\u4e2a\u6784\u9020\u5668\u548c\u7c7b\u5b9a\u4e49&quot;\u4ea4\u7ec7&quot;\u5728\u4e00\u8d77\u7c7b\u540d\u540e\u9762\u7684\u5185\u5bb9\u5c31\u662f\u4e3b\u6784\u9020\u5668\uff0c\u5982\u679c\u53c2\u6570\u5217\u8868\u4e3a\u7a7a\u7684\u8bdd\uff0c()\u53ef\u4ee5\u7701\u7565<br \/> scala\u7684\u7c7b\u6709\u4e14\u4ec5\u6709\u4e00\u4e2a\u4e3b\u6784\u9020\u5668\uff0c\u8981\u60f3\u63d0\u4f9b\u66f4\u52a0\u4e30\u5bcc\u7684\u6784\u9020\u5668\uff0c\u5c31\u9700\u8981\u4f7f\u7528\u8f85\u52a9\u6784\u9020\u5668,\u8f85\u52a9\u6784\u9020\u5668\u662f\u53ef\u9009\u7684\uff0c\u5b83\u4eec\u53eb\u505athis def this<br \/> \u6ce8\u610f\uff1a\u4e3b\u6784\u9020\u5668\u4f1a\u6267\u884c\u7c7b\u5b9a\u4e49\u4e2d\u7684\u6240\u6709\u8bed\u53e5<br \/> \u4ee3\u7801\u793a\u4f8b\uff1a<\/p> \n <pre><code class=\"language-Scala\">\/\/ \u7c7b\u9ed8\u8ba4\u6709\u4e00\u4e2a\u65e0\u53c2\u7684\u4e3b\u6784\u9020\u51fd\u6570\nclass User { \n}\n\nval user: User = new User\n\n\/\/ \u4e24\u4e2a\u53c2\u6570\u7684\u4e3b\u6784\u9020\u51fd\u6570\nclass User2(val name: String, age: Int) { \n\n}\nval user2 = new User2(&quot;jim&quot;, 23)\n\/\/ \u4f7f\u7528val\u4fee\u9970\u7684\u53d8\u91cf\u9ed8\u8ba4\u662f\u6210\u5458\u53d8\u91cf\uff0c\u5bf9\u8c61\u53ef\u4ee5\u8bbf\u95ee\n\/\/ user2.age   \/\/ age\u6ca1\u6709\u4f7f\u7528val\u6216\u8005var\u4fee\u9970 \u6240\u4ee5\u4e0d\u80fd\u88ab\u8bbf\u95ee,\u4ed6\u4e0d\u662f\u4e00\u4e2a\u6210\u5458\u53d8\u91cf\uff0c\u800c\u662f\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\n\n\n\/\/\u8f85\u52a9\u6784\u9020\u5668\nclass User3 {\n   var name: String = _\n   var age: Int = _\n  \/\/ \u8f85\u52a9\u6784\u9020\u51fd\u6570\n  def this(name: String, age: Int) {\n    \/\/ \u6784\u9020\u51fd\u6570\u4e2d\u7684\u9996\u884c\u5fc5\u987b\u8c03\u7528\u4e3b\u6784\u9020\u51fd\u6570\u6216\u8005\u5176\u4ed6\u6784\u9020\u51fd\u6570\n    this()\n    this.name = name\n    this.age = age\n  }\n  \/\/ \u8f85\u52a9\u6784\u9020\u51fd\u6570\n  def this(msg: String) = {\n    \/\/ \u9996\u884c\u8c03\u7528\u4e00\u4e2a\u6784\u9020\n    this(&quot;ww&quot;, 12)\n    println(msg)\n  }\n}\nval u1 = new User3()\nval u2 = new User3(&quot;&quot;)\nval u3 = new User3(&quot;lisi&quot;, 23)\nprintln(u3.name)\n<\/code><\/pre> \n <p>\u603b\u7ed3:<\/p> \n <ol> \n  <li>\u6709\u4e24\u7c7b\u6784\u9020\u5668\uff1a\u4e3b\u6784\u9020\u5668\uff0c\u8f85\u52a9\u6784\u9020\u5668<\/li> \n  <li>\u6784\u9020\u5668\u7684\u5b9a\u4e49\u4f4d\u7f6e\uff1a\u4e3b\u6784\u9020\u5668\u548c\u7c7b\u4ea4\u7ec7\u5728\u4e00\u8d77\uff0cclass Student2(val name: String, var age: Int)<\/li> \n  <li>\u8f85\u52a9\u6784\u9020\u5668\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u65b9\u6cd5\uff0c\u5b9a\u4e49\u5728\u7c7b\u4e2d def this(name:String,age:Int,gender:String)<\/li> \n  <li>\u8f85\u52a9\u6784\u9020\u5668\uff0c\u7b2c\u4e00\u884c\u5fc5\u987b\u8c03\u7528\u4e3b\u6784\u9020\u5668\uff08\u6216\u8005\u5176\u4ed6\u7684\u8f85\u52a9\u6784\u9020\u5668\uff09<\/li> \n  <li>\u8f85\u52a9\u6784\u9020\u5668\u7684\u53c2\u6570\u4e0d\u80fd\u548c\u4e3b\u6784\u9020\u5668\u7684\u53c2\u6570\u5b8c\u5168\u4e00\u81f4\uff08\u53c2\u6570\u4e2a\u6570\uff0c\u53c2\u6570\u7c7b\u578b\uff0c\u53c2\u6570\u987a\u5e8f\uff09<\/li> \n  <li>\u53ef\u4ee5\u5b9a\u4e49\u7a7a\u53c2\u7684\u8f85\u52a9\u6784\u9020\u5668\uff0c\u4f46\u662f\u4e3b\u6784\u9020\u5668\u7684\u53c2\u6570\u5fc5\u987b\u8fdb\u884c\u521d\u59cb\u5316\u8d4b\u503c<\/li> \n  <li>\u4f5c\u7528\u57df\uff1a\u8f85\u52a9\u6784\u9020\u5668\u7684\u53d8\u91cf\u4f5c\u7528\u57df\uff0c\u53ea\u5728\u65b9\u6cd5\u4e2d\uff0c\u4e3b\u6784\u9020\u5668\u7684\u4f5c\u7528\u57df\u662f\u7c7b\u4e2d\u9664\u4e86\u6210\u5458\u5c5e\u6027\u548c\u6210\u5458\u65b9\u6cd5\u4e4b\u5916\u7684\u6240\u6709\u8303\u56f4\uff08\u53ef\u4ee5\u901a\u8fc7\u53cd\u7f16\u8bd1\u67e5\u770b\u6e90\u7801\uff09<\/li> \n <\/ol> \n <p>\u6784\u9020\u5668\u7684\u53c2\u6570\u8bf4\u660e<\/p> \n <ul> \n  <li>\u4e3b\u6784\u9020\u51fd\u6570\u4e2d\u4f7f\u7528val \u548c var\u4fee\u9970\u7684\u53d8\u91cf\u4e3a\u6210\u5458\u53d8\u91cf<\/li> \n  <li>val \u4fee\u9970\u7684\u53d8\u91cf\u9ed8\u8ba4\u53ea\u6709getter\u65b9\u6cd5 \u4e00\u8981\u521d\u59cb\u5316<\/li> \n  <li>var \u4fee\u9970\u7684\u53d8\u91cf\u9ed8\u8ba4\u6709 get\u548cset\u65b9\u6cd5 \u76f4\u63a5\u70b9\u5c5e\u6027\u64cd\u4f5c \u4f7f\u7528 _ \u5360\u4f4d\u53ef\u4ee5\u7a0d\u540e\u8d4b\u503c<\/li> \n  <li>@BeanProperty\u4f1a\u751f\u6210getMsg setMsg\u65b9\u6cd5<\/li> \n <\/ul> \n <h2 id=\"\u6210\u5458\u65b9\u6cd5\u51fd\u6570\">\u6210\u5458\u65b9\u6cd5\/\u51fd\u6570<\/h2> \n <p>\u5728\u7c7b\u7684\u6210\u5458\u4f4d\u7f6e\u5b9a\u4e49\u7684\u51fd\u6570\u6216\u8005\u65b9\u6cd5\u662f\u7c7b\u7684\u6210\u5458\u7684\u4e00\u90e8\u5206<\/p> \n <h2 id=\"\u4ee3\u7801\u5757\">\u4ee3\u7801\u5757<\/h2> \n <p>\u5728\u7c7b\u6216\u8005\u5bf9\u8c61\u4e2d\u7684\u4ee3\u7801\u5757\u5728\u5b9e\u4f8b\u5316\u7684\u65f6\u5019\u4f1a\u88ab\u8c03\u7528<\/p> \n <ul> \n  <li>\u5728\u7c7b\u6210\u5458\u4f4d\u7f6e\u7684\u4ee3\u7801\u5757 \u6784\u9020\u4ee3\u7801\u5757 \u6bcf\u6b21\u521b\u5efa\u5bf9\u8c61\u90fd\u4f1a\u6267\u884c\u4e00\u6b21<\/li> \n  <li>\u5728object\u4e2d\u6210\u5458\u4f4d\u7f6e\u7684\u4ee3\u7801\u5757\u662f\u9759\u6001\u4ee3\u7801\u5757 \u53ea\u6267\u884c\u4e00\u6b21<\/li> \n  <li>\u4ee3\u7801\u6709\u8fd4\u56de\u503c<\/li> \n <\/ul> \n <h2 id=\"object\u7c7b\u7684\u5e95\u5c42\u539f\u7406\">object\u7c7b\u7684\u5e95\u5c42\u539f\u7406<\/h2> \n <pre><code class=\"language-Scala\">package com.doit.day01.day02\n\n\/\/\u5982\u679c\u6784\u9020\u5668\u4e2d\u7684\u53d8\u91cf\uff0c\u4e0d\u52a0var \u6216\u8005val \u90a3\u4ed6\u5c31\u662f\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\n\/\/\u52a0\u4e86var \u6216\u8005val \u7684\u8bdd\u4ed6\u5c31\u662f\u4e00\u4e2a\u79c1\u6709\u7684\u6210\u5458\u53d8\u91cf\nclass Student1(var id: Int, val name: String) {\n\n  def sayHello: Unit = {\n    println(name + &quot;:\u4f60\u597d&quot;)\n  }\n\n  val sayFunc = () =&gt; {\n    println(&quot;hello:&quot; + name)\n  }\n}\n\n\nobject Student2{\n  var id: Int = 1\n  \/\/\u5982\u679c\u5728\u6210\u5458\u53d8\u91cf\u7684\u4f4d\u7f6e\u4e0a\u7ed9\u4e00\u4e2a_\u4f5c\u4e3a\u5360\u4f4d\u7b26\uff0c\u76f8\u5f53\u4e8e\u662f\u7ed9\u4ed6\u8d4b\u4e86\u4e00\u4e2a\u9ed8\u8ba4\u503c\u554a\n  var name: String =_\n\n  def sayHello: Unit = {\n    println(name + &quot;:\u4f60\u597d&quot;)\n  }\n  val sayFunc = (x:String) =&gt; {\n    println(&quot;hello:&quot; + name + x)\n  }\n}\n\n\nobject Demo01_\u9762\u5411\u5bf9\u8c61 {\n  def main(args: Array[String]): Unit = {\n\n    Student2.sayFunc(&quot;a&quot;)\n\n    val student1: Student1 = new Student1(1, &quot;zhangsan&quot;)\n    println(student1.name)\n    println(student1.id)\n    \/\/    student1.name = &quot;lisi&quot;  \u7528val \u4fee\u9970\u7684\uff0c\u4e0d\u80fd\u4fee\u6539\n    student1.id = 2\n    println(student1.id)\n\n    student1.sayHello\n    student1.sayFunc()\n    println(Student2.name)\n  }\n}\n<\/code><\/pre> \n <p><strong><a href=https:\/\/www.cppentry.com style=text-decoration:underline;font-size:14px;color:#F70968; target=_blank>java<\/a>\u624b\u5199\u5b9e\u73b0\uff1a<\/strong><\/p> \n <pre><code class=\"language-Java\">package com.doit;\n\n\npublic class Person {\n    public static String getName(){\n        return Person$.person.getName();\n    }\n\n    public static Integer getAge(){\n        return Person$.person.getAge();\n    }\n\n    public static void setName(String name ){\n        Person$.person.setName(name);\n    }\n\n    public static void setAge(Integer age ){\n        Person$.person.setAge(age);\n    }\n}\n\nclass Person$ {\n    \/\/\u81ea\u5df1\u7684\u5bf9\u8c61\n    public static Person$ person ;\n    \/\/\u6210\u5458\u53d8\u91cf\n    private String name;\n    private int age;\n\n    static {\n        person  = new Person$();\n    }\n\n    private Person$() {\n    }\n\n    public String getName() {\n        return name;\n    }\n\n    public void setName(String name) {\n        this.name = name;\n    }\n\n    public int getAge() {\n        return age;\n    }\n\n    public void setAge(int age) {\n        this.age = age;\n    }\n}\n\n\nclass Test{\n    public static void main(String[] args) {\n        Person person = new Person();\n        person.setName(&quot;\u5f20\u4e09&quot;);\n        person.setAge(18);\n        String name1 = person.getName();\n        Integer age1 = person.getAge();\n        System.out.println(name1);\n        System.out.pr","orderid":"0","title":"Scala\u9762\u5411\u5bf9\u8c61(\u4e00)","smalltitle":"","mid":"0","fname":"Scala","special_id":"0","bak_id":"0","info":"0","hits":"644","pages":"8","comments":"0","posttime":"2023-07-23 13:24:52","list":"1690089892","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=Scala' target=_blank>Scala<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%CF%F2%B6%D4%CF%F3' target=_blank>\u5411\u5bf9\u8c61<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"119.59.235.169","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"Scala\u9762\u5411\u5bf9\u8c61","lastview":"1716082012","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}