{"id":133167,"date":"2020-07-13T01:57:56","date_gmt":"2020-07-12T17:57:56","guid":{"rendered":"http:\/\/4563.org\/?p=133167"},"modified":"2020-07-13T01:57:56","modified_gmt":"2020-07-12T17:57:56","slug":"scala%e8%af%ad%e8%a8%80%e5%ad%a6%e4%b9%a0%ef%bc%88%e5%85%ad%ef%bc%89%e3%80%81%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e7%bc%96%e7%a8%8b%e7%b1%bb%e3%80%81%e5%af%b9%e8%b1%a1%e3%80%81%e7%bb%a7%e6%89%bf","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=133167","title":{"rendered":"scala\u8bed\u8a00\u5b66\u4e60\uff08\u516d\uff09\u3001\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7c7b\u3001\u5bf9\u8c61\u3001\u7ee7\u627f\u3001trait\u7279\u8d28"},"content":{"rendered":"

<\/a>scala\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e4b\u7c7b<\/h2>\n

<\/a>\u7c7b\u7684\u5b9a\u4e49<\/h3>\n

scala\u662f\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7684\uff0c\u4e5f\u6709\u7c7b\u548c\u5bf9\u8c61\u7684\u6982\u5ff5\u3002\u5b9a\u4e49\u4e00\u4e2aCustomer\u7c7b\uff0c\u5e76\u6dfb\u52a0\u6210\u5458\u53d8\u91cf\/\u6210\u5458\u65b9\u6cd5\u3002\u6dfb\u52a0\u4e00\u4e2amain\u65b9\u6cd5\uff0c\u5e76\u521b\u5efaCustomer\u7c7b\u7684\u5bf9\u8c61\uff0c\u5e76\u7ed9\u5bf9\u8c61\u8d4b\u503c\uff0c\u6253\u5370\u5bf9\u8c61\u4e2d\u7684\u6210\u5458\uff0c\u8c03\u7528\u6210\u5458\u65b9\u6cd5<\/p>\n

\n\n\n
\n
1<\/span>
2<\/span>
3<\/span>
4<\/span>
5<\/span>
6<\/span>
7<\/span>
8<\/span>
9<\/span>
10<\/span>
11<\/span>
12<\/span>
13<\/span>
14<\/span>
15<\/span>
16<\/span>
17<\/span>
18<\/span>
19<\/span>
20<\/span>
21<\/span>
22<\/span>
<\/pre>\n<\/td>\n
\n
class<\/span> Customer<\/span> <\/span>{<\/span>
  var<\/span> name:String<\/span> = _<\/span>
  var<\/span> sex:String<\/span> = _<\/span>
  val<\/span> registerDate:Date<\/span> = new<\/span> Date<\/span><\/span>
<\/span>
  def<\/span> sayHi<\/span><\/span>(msg:String<\/span>) = {<\/span>
    println(msg)<\/span>
  }<\/span>
}<\/span>
<\/span>
object<\/span> Main<\/span> <\/span>{<\/span>
  def<\/span> main<\/span><\/span>(args: Array<\/span>[String<\/span>]): Unit<\/span> = {<\/span>
    val<\/span> customer = new<\/span> Customer<\/span><\/span>
    \/\/\u7ed9\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u8d4b\u503c<\/span><\/span>
    customer.name = \"\u5f20\u4e09\"<\/span><\/span>
    customer.sex = \"\u7537\"<\/span><\/span>
<\/span>
    println(s\"\u59d3\u540d: ${customer.name}<\/span>, \u6027\u522b\uff1a${customer.sex}<\/span>, \u6ce8\u518c\u65f6\u95f4: ${customer.registerDate}<\/span>\"<\/span>)<\/span>
    \/\/\u5bf9\u8c61\u8c03\u7528\u65b9\u6cd5  <\/span><\/span>
    customer.sayHi(\"\u4f60\u597d!\"<\/span>)<\/span>
  }<\/span>
}<\/span>
<\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
<\/a>\u7279\u8bf4\u8bf4\u660e\uff1a<\/h3>\n
    \n
  1. var name:String = _<\/code>\u8868\u793a\u4f7f\u7528\u9ed8\u8ba4\u503c\u8fdb\u884c\u521d\u59cb\u5316\uff0c \u4f8b\u5982\uff1aString\u7c7b\u578b\u9ed8\u8ba4\u503c\u662fnull\uff0cInt\u7c7b\u578b\u9ed8\u8ba4\u503c\u662f0\uff0cBoolean\u7c7b\u578b\u9ed8\u8ba4\u503c\u662ffalse\u2026<\/li>\n
  2. val\u53d8\u91cf\u4e0d\u80fd\u4f7f\u7528_\u6765\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u56e0\u4e3aval\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u6240\u4ee5\u5fc5\u987b\u624b\u52a8\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u503c<\/li>\n
  3. main\u65b9\u6cd5\u5fc5\u987b\u8981\u653e\u5728\u4e00\u4e2ascala\u7684object\uff08\u5355\u4f8b\u5bf9\u8c61\uff09\u4e2d\u624d\u80fd\u6267\u884c<\/li>\n<\/ol>\n
    <\/a>\u7c7b\u7684\u6784\u9020\u5668<\/h2>\n
    <\/a>\u4e3b\u6784\u9020\u5668<\/h3>\n
    \u4e3b\u6784\u9020\u5668\u662f\u6307\u5728\u7c7b\u540d\u7684\u540e\u9762\u8ddf\u4e0a\u4e00\u7cfb\u5217\u53c2\u6570\uff0c\u4f8b\u5982<\/p>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    <\/pre>\n<\/td>\n
    		\n
    class<\/span> \u7c7b\u540d<\/span>(var\/val \u53c2\u6570\u540d:\u7c7b\u578b = \u9ed8\u8ba4\u503c, var\/val \u53c2\u6570\u540d:\u7c7b\u578b = \u9ed8\u8ba4\u503c<\/span>)<\/span>{<\/span>
      \/\/ \u6784\u9020\u4ee3\u7801\u5757<\/span><\/span>
    }<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u8f85\u52a9\u6784\u9020\u5668<\/h3>\n
    \u5728\u7c7b\u4e2d\u4f7f\u7528this\u6765\u5b9a\u4e49\uff0c\u4f8b\u5982<\/p>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    <\/pre>\n<\/td>\n
    		\n
    def<\/span> this<\/span><\/span>(\u53c2\u6570\u540d:\u7c7b\u578b, \u53c2\u6570\u540d:\u7c7b\u578b) {<\/span>
      ...<\/span>
    }<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u6f14\u793a<\/h3>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    4<\/span>
    5<\/span>
    6<\/span>
    7<\/span>
    8<\/span>
    9<\/span>
    10<\/span>
    11<\/span>
    12<\/span>
    13<\/span>
    <\/pre>\n<\/td>\n
    		\n
    class<\/span> Student<\/span>(val name: String<\/span>, val age: Int<\/span><\/span>) <\/span>{<\/span>
        <\/span>
      val<\/span> address: String<\/span> = \"beijing\"<\/span> <\/span>
      \/\/ \u5b9a\u4e49\u4e00\u4e2a\u53c2\u6570\u7684\u8f85\u52a9\u6784\u9020\u5668<\/span><\/span>
      def<\/span> this<\/span><\/span>(name: String<\/span>) {<\/span>
        \/\/ \u8f85\u52a9\u6784\u9020\u5668\u7684\u7b2c\u4e00\u884c\u5fc5\u987b\u8c03\u7528\u4e3b\u6784\u9020\u5668\u6216\u5176\u4ed6\u8f85\u52a9\u6784\u9020\u5668\u6216\u8005super\u7236\u7c7b\u7684\u6784\u9020\u5668<\/span><\/span>
        this<\/span>(name, 20<\/span>)<\/span>
      }<\/span>
    <\/span>
      def<\/span> this<\/span><\/span>(age: Int<\/span>) {<\/span>
        this<\/span>(\"\u67d0\u67d0\u67d0\"<\/span>, age)<\/span>
      }<\/span>
    }<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>scala\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e4b\u5bf9\u8c61<\/h2>\n
    <\/a>scala\u4e2d\u7684object<\/h3>\n
    scala\u4e2d\u662f\u6ca1\u6709Java\u4e2d\u7684\u9759\u6001\u6210\u5458\u7684\u3002\u5982\u679c\u5c06\u6765\u6211\u4eec\u9700\u8981\u7528\u5230static\u53d8\u91cf\u3001static\u65b9\u6cd5\uff0c\u5c31\u8981\u7528\u5230scala\u4e2d\u7684\u5355\u4f8b\u5bf9\u8c61object<\/p>\n
    <\/a>\u5b9a\u4e49object<\/h3>\n
    \u5b9a\u4e49\u5355\u4f8b\u5bf9\u8c61\u548c\u5b9a\u4e49\u7c7b\u5f88\u50cf\uff0c\u5c31\u662f\u628aclass\u6362\u6210object<\/p>\n
    <\/a>\u6f14\u793a<\/h3>\n
    \u5b9a\u4e49\u4e00\u4e2a\u5de5\u5177\u7c7b\uff0c\u7528\u6765\u683c\u5f0f\u5316\u65e5\u671f\u65f6\u95f4<\/p>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    4<\/span>
    5<\/span>
    6<\/span>
    7<\/span>
    8<\/span>
    9<\/span>
    10<\/span>
    11<\/span>
    12<\/span>
    13<\/span>
    14<\/span>
    15<\/span>
    16<\/span>
    17<\/span>
    18<\/span>
    <\/pre>\n<\/td>\n
    		\n
    object<\/span> DateUtils<\/span> <\/span>{<\/span>
    <\/span>
      \/\/ \u5728object\u4e2d\u5b9a\u4e49\u7684\u6210\u5458\u53d8\u91cf\uff0c\u76f8\u5f53\u4e8eJava\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u9759\u6001\u53d8\u91cf<\/span><\/span>
      \/\/ \u5b9a\u4e49\u4e00\u4e2aSimpleDateFormat\u65e5\u671f\u65f6\u95f4\u683c\u5f0f\u5316\u5bf9\u8c61<\/span><\/span>
      val<\/span> simpleDateFormat = new<\/span> SimpleDateFormat<\/span>(\"yyyy-MM-dd HH:mm\"<\/span>)<\/span>
    <\/span>
      \/\/ \u6784\u9020\u4ee3\u7801<\/span><\/span>
      println(\"\u6784\u9020\u4ee3\u7801\"<\/span>)<\/span>
        <\/span>
      \/\/ \u76f8\u5f53\u4e8eJava\u4e2d\u5b9a\u4e49\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5<\/span><\/span>
      def<\/span> format<\/span><\/span>(date:Date<\/span>) = simpleDateFormat.format(date)<\/span>
    <\/span>
      \/\/ main\u662f\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5\uff0c\u6240\u4ee5\u5fc5\u987b\u8981\u5199\u5728object\u4e2d<\/span><\/span>
      def<\/span> main<\/span><\/span>(args: Array<\/span>[String<\/span>]): Unit<\/span> = {<\/span>
          <\/span>
        println { DateUtils<\/span>.format(new<\/span> Date<\/span>()) };<\/span>
      }<\/span>
    }<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u8bf4\u660e<\/h3>\n
      \n
    1. \u4f7f\u7528object \u5355\u4f8b\u5bf9\u8c61\u540d\u5b9a\u4e49\u4e00\u4e2a\u5355\u4f8b\u5bf9\u8c61\uff0c\u53ef\u4ee5\u7528object\u4f5c\u4e3a\u5de5\u5177\u7c7b\u6216\u8005\u5b58\u653e\u5e38\u91cf<\/li>\n
    2. \u5728\u5355\u4f8b\u5bf9\u8c61\u4e2d\u5b9a\u4e49\u7684\u53d8\u91cf\uff0c\u7c7b\u4f3c\u4e8eJava\u4e2d\u7684static\u6210\u5458\u53d8\u91cf<\/li>\n
    3. \u5728\u5355\u4f8b\u5bf9\u8c61\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\uff0c\u7c7b\u4f3c\u4e8eJava\u4e2d\u7684static\u65b9\u6cd5<\/li>\n
    4. object\u5355\u4f8b\u5bf9\u8c61\u7684\u6784\u9020\u4ee3\u7801\u53ef\u4ee5\u76f4\u63a5\u5199\u5728\u82b1\u62ec\u53f7\u4e2d<\/li>\n
    5. \u8c03\u7528\u5355\u4f8b\u5bf9\u8c61\u7684\u65b9\u6cd5\uff0c\u76f4\u63a5\u4f7f\u7528\u5355\u4f8b\u5bf9\u8c61\u540d.\u65b9\u6cd5\u540d\uff0c\u8bbf\u95ee\u5355\u4f8b\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\u4e5f\u662f\u4f7f\u7528\u5355\u4f8b\u5bf9\u8c61\u540d.\u53d8\u91cf\u540d<\/li>\n
    6. \u5355\u4f8b\u5bf9\u8c61\u53ea\u80fd\u6709\u4e00\u4e2a\u65e0\u53c2\u7684\u4e3b\u6784\u9020\u5668\uff0c\u4e0d\u80fd\u6dfb\u52a0\u5176\u4ed6\u53c2\u6570<\/li>\n<\/ol>\n
      <\/a>scala\u4e2d\u7684\u4f34\u751f\u5bf9\u8c61<\/h3>\n
      \u5728\u540c\u4e00\u4e2ascala\u6587\u4ef6\uff0c\u6709\u4e00\u4e2aclass\u548cobject\u5177\u6709\u540c\u6837\u7684\u540d\u5b57\uff0c\u90a3\u4e48\u5c31\u79f0\u8fd9\u4e2aobject\u662fclass\u7684\u4f34\u751f\u5bf9\u8c61\uff0cclass\u662fobject\u7684\u4f34\u751f\u7c7b,\u4f34\u751f\u7c7b\u548c\u4f34\u751f\u5bf9\u8c61\u7684\u6700\u5927\u7279\u70b9\u662f\uff0c\u53ef\u4ee5\u76f8\u4e92\u8bbf\u95ee\uff1b<\/p>\n
      \n\n\n
      \n
      1<\/span>
      2<\/span>
      3<\/span>
      4<\/span>
      5<\/span>
      6<\/span>
      7<\/span>
      8<\/span>
      9<\/span>
      10<\/span>
      11<\/span>
      12<\/span>
      13<\/span>
      14<\/span>
      15<\/span>
      16<\/span>
      17<\/span>
      18<\/span>
      19<\/span>
      20<\/span>
      21<\/span>
      <\/pre>\n<\/td>\n
      		\n
      class<\/span> ClassObject<\/span> <\/span>{<\/span>
        val<\/span> id = 1<\/span><\/span>
        private<\/span> var<\/span> name = \"itcast\"<\/span><\/span>
        def<\/span> printName<\/span><\/span>(): Unit<\/span> ={<\/span>
          \/\/\u5728Dog\u7c7b\u4e2d\u53ef\u4ee5\u8bbf\u95ee\u4f34\u751f\u5bf9\u8c61Dog\u7684\u79c1\u6709\u5c5e\u6027<\/span><\/span>
          println(ClassObject<\/span>.CONSTANT<\/span> + name )<\/span>
        }<\/span>
      <\/span>
      <\/span>
      }<\/span>
      <\/span>
      object<\/span> ClassObject<\/span><\/span>{<\/span>
        \/\/\u4f34\u751f\u5bf9\u8c61\u4e2d\u7684\u79c1\u6709\u5c5e\u6027<\/span><\/span>
        private<\/span> val<\/span> CONSTANT<\/span> = \"\u6c6a\u6c6a\u6c6a : \"<\/span><\/span>
        def<\/span> main<\/span><\/span>(args: Array<\/span>[String<\/span>]) {<\/span>
          val<\/span> p = new<\/span> ClassObject<\/span><\/span>
          \/\/\u8bbf\u95ee\u79c1\u6709\u7684\u5b57\u6bb5name<\/span><\/span>
          p.name = \"123\"<\/span><\/span>
          p.printName()<\/span>
        }<\/span>
      }<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      <\/a>\u8bf4\u660e<\/h4>\n
      \n
      (1). \u4f34\u751f\u7c7b\u548c\u4f34\u751f\u5bf9\u8c61\u7684\u540d\u5b57\u5fc5\u987b\u662f\u4e00\u6837\u7684
      (2). \u4f34\u751f\u7c7b\u548c\u4f34\u751f\u5bf9\u8c61\u9700\u8981\u5728\u4e00\u4e2ascala\u6e90\u6587\u4ef6\u4e2d
      (3). \u4f34\u751f\u7c7b\u548c\u4f34\u751f\u5bf9\u8c61\u53ef\u4ee5\u4e92\u76f8\u8bbf\u95eeprivate\u7684\u5c5e\u6027<\/p>\n<\/blockquote>\n
      <\/a>scala\u4e2dobject\u7684apply\u65b9\u6cd5<\/h3>\n
      \u6211\u4eec\u4e4b\u524d\u4f7f\u7528\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u6765\u521b\u5efa\u4e00\u4e2aArray\u5bf9\u8c61\u3002<\/p>\n
      \n\n\n
      \n
      1<\/span>
      2<\/span>
      <\/pre>\n<\/td>\n
      		\n
      \/\/ \u521b\u5efa\u4e00\u4e2aArray\u5bf9\u8c61<\/span><\/span>
      val<\/span> a = Array<\/span>(1<\/span>,2<\/span>,3<\/span>,4<\/span>)<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      \u8fd9\u79cd\u5199\u6cd5\u975e\u5e38\u7b80\u4fbf\uff0c\u4e0d\u9700\u8981\u518d\u5199\u4e00\u4e2anew\uff0c\u7136\u540e\u6572\u4e00\u4e2a\u7a7a\u683c\uff0c\u518d\u5199\u7c7b\u540d\u3002\u5982\u4f55\u76f4\u63a5\u4f7f\u7528\u7c7b\u540d\u6765\u521b\u5efa\u5bf9\u8c61\u5462\uff1f\u67e5\u770bscala\u6e90\u4ee3\u7801\u53d1\u73b0\uff1a
      \"scala\u8bed\u8a00\u5b66\u4e60\uff08\u516d\uff09\u3001\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7c7b\u3001\u5bf9\u8c61\u3001\u7ee7\u627f\u3001trait\u7279\u8d28\"<\/p>\n
      \u7b54\u6848\u5c31\u662f\uff1a \u5b9e\u73b0\u4f34\u751f\u5bf9\u8c61\u7684apply\u65b9\u6cd5\uff0c\u4f34\u751f\u5bf9\u8c61\u7684apply\u65b9\u6cd5\u7528\u6765\u5feb\u901f\u5730\u521b\u5efa\u4e00\u4e2a\u4f34\u751f\u7c7b\u7684\u5bf9\u8c61\u3002<\/p>\n
      \n\n\n
      \n
      1<\/span>
      2<\/span>
      3<\/span>
      4<\/span>
      5<\/span>
      6<\/span>
      7<\/span>
      8<\/span>
      9<\/span>
      10<\/span>
      11<\/span>
      12<\/span>
      13<\/span>
      14<\/span>
      15<\/span>
      16<\/span>
      17<\/span>
      18<\/span>
      19<\/span>
      20<\/span>
      21<\/span>
      22<\/span>
      23<\/span>
      24<\/span>
      25<\/span>
      26<\/span>
      27<\/span>
      28<\/span>
      29<\/span>
      30<\/span>
      31<\/span>
      <\/pre>\n<\/td>\n
      		\n
      class<\/span> Person<\/span>(var name:String<\/span>, var age:Int<\/span><\/span>) <\/span>{<\/span>
      <\/span>
        override<\/span> def<\/span> toString<\/span> <\/span>= s\"Person($name<\/span>, $age<\/span>)\"<\/span><\/span>
      }<\/span>
      <\/span>
      object<\/span> Person<\/span> <\/span>{<\/span>
        \/\/ \u5b9e\u73b0apply\u65b9\u6cd5<\/span><\/span>
        \/\/ \u8fd4\u56de\u7684\u662f\u4f34\u751f\u7c7b\u7684\u5bf9\u8c61<\/span><\/span>
        def<\/span> apply<\/span><\/span>(name:String<\/span>, age:Int<\/span>): Person<\/span> = new<\/span> Person<\/span>(name, age)<\/span>
      <\/span>
        \/\/ apply\u65b9\u6cd5\u652f\u6301\u91cd\u8f7d<\/span><\/span>
        def<\/span> apply<\/span><\/span>(name:String<\/span>):Person<\/span> = new<\/span> Person<\/span>(name, 20<\/span>)<\/span>
      <\/span>
        def<\/span> apply<\/span><\/span>(age:Int<\/span>):Person<\/span> = new<\/span> Person<\/span>(\"\u67d0\u67d0\u67d0\"<\/span>, age)<\/span>
      <\/span>
        def<\/span> apply<\/span><\/span>():Person<\/span> = new<\/span> Person<\/span>(\"\u67d0\u67d0\u67d0\"<\/span>, 20<\/span>)<\/span>
      }<\/span>
      <\/span>
      object<\/span> Main2<\/span> <\/span>{<\/span>
        def<\/span> main<\/span><\/span>(args: Array<\/span>[String<\/span>]): Unit<\/span> = {<\/span>
          val<\/span> p1 = Person<\/span>(\"\u5f20\u4e09\"<\/span>, 20<\/span>)<\/span>
          val<\/span> p2 = Person<\/span>(\"\u674e\u56db\"<\/span>)<\/span>
          val<\/span> p3 = Person<\/span>(100<\/span>)<\/span>
          val<\/span> p4 = Person<\/span>()<\/span>
      <\/span>
          println(p1)<\/span>
          println(p2)<\/span>
          println(p3)<\/span>
          println(p4)<\/span>
        }<\/span>
      }<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      <\/a>\u8bf4\u660e<\/h4>\n
        \n
      1. \u5f53\u9047\u5230\u7c7b\u540d(\u53c2\u65701, \u53c2\u65702\u2026)\u4f1a\u81ea\u52a8\u8c03\u7528apply\u65b9\u6cd5\uff0c\u5728apply\u65b9\u6cd5\u4e2d\u6765\u521b\u5efa\u5bf9\u8c61<\/li>\n
      2. \u5b9a\u4e49apply\u65f6\uff0c\u5982\u679c\u53c2\u6570\u5217\u8868\u662f\u7a7a\uff0c\u4e5f\u4e0d\u80fd\u7701\u7565\u62ec\u53f7()\uff0c\u5426\u5219\u5f15\u7528\u7684\u662f\u4f34\u751f\u5bf9\u8c61<\/li>\n<\/ol>\n
        <\/a>scala\u4e2dobject\u7684main\u65b9\u6cd5<\/h3>\n
        scala\u548cJava\u4e00\u6837\uff0c\u5982\u679c\u8981\u8fd0\u884c\u4e00\u4e2a\u7a0b\u5e8f\uff0c\u5fc5\u987b\u6709\u4e00\u4e2amain\u65b9\u6cd5\u3002\u800c\u5728Java\u4e2dmain\u65b9\u6cd5\u662f\u9759\u6001\u7684\uff0c\u800c\u5728scala\u4e2d\u6ca1\u6709\u9759\u6001\u65b9\u6cd5\u3002\u5728scala\u4e2d\uff0c\u8fd9\u4e2amain\u65b9\u6cd5\u5fc5\u987b\u653e\u5728\u4e00\u4e2aobject\u3002<\/p>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        4<\/span>
        5<\/span>
        <\/pre>\n<\/td>\n
        		\n
        object<\/span> Main1<\/span><\/span>{<\/span>
          def<\/span> main<\/span><\/span>(args:Array<\/span>[String<\/span>]) = {<\/span>
            println(\"hello, scala\"<\/span>)<\/span>
          }<\/span>
        }<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        \u4e5f\u53ef\u4ee5\u7ee7\u627f\u81eaApp Trait\uff08\u7279\u8d28\uff09\uff0c\u7136\u540e\u5c06\u9700\u8981\u7f16\u5199\u5728main\u65b9\u6cd5\u4e2d\u7684\u4ee3\u7801\uff0c\u5199\u5728object\u7684\u6784\u9020\u65b9\u6cd5\u4f53\u5185\u3002\u5176\u672c\u8d28\u662f\u8c03\u7528\u4e86Trait\u8fd9\u4e2a\u7279\u8d28\u4e2d\u7684main\u65b9\u6cd5\u3002<\/p>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        <\/pre>\n<\/td>\n
        		\n
        object<\/span> Main2<\/span> extends<\/span> App<\/span> <\/span>{<\/span>
          println(\"hello, scala\"<\/span>)<\/span>
        }<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        <\/a>scala\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e4b\u7ee7\u627f<\/h2>\n
        <\/a>\u7ee7\u627fextends<\/h3>\n
        scala\u548cJava\u4e00\u6837\uff0c\u4f7f\u7528extends<\/code>\u5173\u952e\u5b57\u6765\u5b9e\u73b0\u7ee7\u627f\u3002\u53ef\u4ee5\u5728\u5b50\u7c7b\u4e2d\u5b9a\u4e49\u7236\u7c7b\u4e2d\u6ca1\u6709\u7684\u5b57\u6bb5\u548c\u65b9\u6cd5\uff0c\u6216\u8005\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n
        <\/a>\u793a\u4f8b1\uff1a\u5b9e\u73b0\u7b80\u5355\u7ee7\u627f<\/h4>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        4<\/span>
        5<\/span>
        6<\/span>
        7<\/span>
        8<\/span>
        9<\/span>
        10<\/span>
        11<\/span>
        12<\/span>
        13<\/span>
        14<\/span>
        15<\/span>
        16<\/span>
        17<\/span>
        18<\/span>
        <\/pre>\n<\/td>\n
        		\n
        class Person1 {<\/span>
          var name = "super"<\/span>
        <\/span>
          def getName = this.name<\/span>
        }<\/span>
        <\/span>
        class Student1 extends Person1<\/span>
        <\/span>
        object Main1 {<\/span>
          def main(args: Array[String]): Unit = {<\/span>
            val p1 = new Person1()<\/span>
            val p2 = new Student1()<\/span>
        <\/span>
            p2.name = "\u5f20\u4e09"<\/span>
        <\/span>
            println(p2.getName)<\/span>
          }<\/span>
        }<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        <\/a>\u793a\u4f8b2\uff1a\u5355\u4f8b\u5bf9\u8c61\u5b9e\u73b0\u7ee7\u627f<\/h4>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        4<\/span>
        5<\/span>
        6<\/span>
        7<\/span>
        8<\/span>
        9<\/span>
        10<\/span>
        11<\/span>
        12<\/span>
        13<\/span>
        <\/pre>\n<\/td>\n
        		\n
        class<\/span> Person2<\/span> <\/span>{<\/span>
          var<\/span> name = \"super\"<\/span><\/span>
        <\/span>
          def<\/span> getName<\/span> <\/span>= this<\/span>.name<\/span>
        }<\/span>
        <\/span>
        object<\/span> Student2<\/span> extends<\/span> Person2<\/span><\/span><\/span>
        <\/span><\/span>
        object<\/span> Main2<\/span> <\/span>{<\/span>
          def<\/span> main<\/span><\/span>(args: Array<\/span>[String<\/span>]): Unit<\/span> = {<\/span>
            println(Student2<\/span>.getName)<\/span>
          }<\/span>
        }<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        <\/a>override\u548csuper<\/h3>\n