{"rsdb":{"rid":"377765","subhead":"","postdate":"0","aid":"264305","fid":"90","uid":"1","topic":"1","content":"
\n

Scala\u57fa\u7840\u7bc7<\/h1> \n

\u6570\u636e\u7c7b\u578b<\/h2> \n

\u4e0b\u8868\u4e2d\u5217\u51fa\u7684\u6570\u636e\u7c7b\u578b\u90fd\u662f\u5bf9\u8c61\uff0c\u53ef\u4ee5\u76f4\u63a5\u5bf9\u5b83\u4eec\u8c03\u7528\u65b9\u6cd5\u3002<\/p> \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\u6570\u636e\u7c7b\u578b<\/th> \n \u63cf\u8ff0<\/th> \n <\/tr> \n <\/thead> \n
Byte<\/td> \n 8\u4f4d\u6709\u7b26\u53f7\u8865\u7801\u6574\u6570\u3002\u6570\u503c\u533a\u95f4\u4e3a -128 \u5230 127<\/td> \n <\/tr> \n
Short<\/td> \n 16\u4f4d\u6709\u7b26\u53f7\u8865\u7801\u6574\u6570\u3002\u6570\u503c\u533a\u95f4\u4e3a -32768 \u5230 32767<\/td> \n <\/tr> \n
Int<\/td> \n 32\u4f4d\u6709\u7b26\u53f7\u8865\u7801\u6574\u6570\u3002\u6570\u503c\u533a\u95f4\u4e3a -2147483648 \u5230 2147483647<\/td> \n <\/tr> \n
Long<\/td> \n 64\u4f4d\u6709\u7b26\u53f7\u8865\u7801\u6574\u6570\u3002\u6570\u503c\u533a\u95f4\u4e3a -9223372036854775808 \u5230 9223372036854775807<\/td> \n <\/tr> \n
Float<\/td> \n 32 \u4f4d, IEEE 754 \u6807\u51c6\u7684\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/td> \n <\/tr> \n
Double<\/td> \n 64 \u4f4d IEEE 754 \u6807\u51c6\u7684\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570<\/td> \n <\/tr> \n
Char<\/td> \n 16\u4f4d\u65e0\u7b26\u53f7Unicode\u5b57\u7b26, \u533a\u95f4\u503c\u4e3a U+0000 \u5230 U+FFFF<\/td> \n <\/tr> \n
String<\/td> \n \u5b57\u7b26\u5e8f\u5217<\/td> \n <\/tr> \n
Boolean<\/td> \n true\u6216false<\/td> \n <\/tr> \n
Unit<\/td> \n \u8868\u793a\u65e0\u503c\uff0c\u548c\u5176\u4ed6\u8bed\u8a00\u4e2dvoid\u7b49\u540c\u3002\u7528\u4f5c\u4e0d\u8fd4\u56de\u4efb\u4f55\u7ed3\u679c\u7684\u65b9\u6cd5\u7684\u7ed3\u679c\u7c7b\u578b\u3002Unit\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\u503c\uff0c\u5199\u6210()\u3002<\/td> \n <\/tr> \n
Null<\/td> \n null \u6216\u7a7a\u5f15\u7528<\/td> \n <\/tr> \n
Nothing<\/td> \n Nothing\u7c7b\u578b\u5728Scala\u7684\u7c7b\u5c42\u7ea7\u7684\u6700\u5e95\u7aef\uff1b\u5b83\u662f\u4efb\u4f55\u5176\u4ed6\u7c7b\u578b\u7684\u5b50\u7c7b\u578b\u3002<\/td> \n <\/tr> \n
Any<\/td> \n Any\u662f\u6240\u6709\u5176\u4ed6\u7c7b\u7684\u8d85\u7c7b<\/td> \n <\/tr> \n
AnyRef<\/td> \n AnyRef\u7c7b\u662fScala\u91cc\u6240\u6709\u5f15\u7528\u7c7b(reference class)\u7684\u57fa\u7c7b<\/td> \n <\/tr> \n <\/tbody> \n <\/table> \n

\u8868\u793aLong\u7c7b\u578b\uff0c\u5728\u6570\u5b57\u540e\u9762\u6dfb\u52a0L\u6216\u8005l\u4f5c\u4e3a\u540e\u7f00\uff1b\u6d6e\u70b9\u6570\u540e\u9762\u6709f\u6216\u8005F\u540e\u7f00\u65f6\uff0c\u8868\u793aFloat\u7c7b\u578b\uff0c\u5426\u5219\u5c31\u662fDouble<\/p> \n

\u53d8\u91cf<\/h2> \n

\u7528\u5173\u952e\u8bcd\u201cvar\u201d<\/strong>\u58f0\u660e\u53d8\u91cf\uff0c\u5173\u952e\u8bcd"val"<\/strong>\u58f0\u660e\u5e38\u91cf\u3002<\/p> \n 

var myName : String = "gyt"\nval myAge : Int = 21 \n<\/code><\/pre> \n 
scala\u4e2d\u4e0d\u4e00\u5b9a\u8981\u6307\u660e\u6570\u636e\u7c7b\u578b\uff0c\u5176\u6570\u636e\u7c7b\u578b\u901a\u8fc7\u53d8\u91cf\u6216\u5e38\u91cf\u7684\u521d\u59cb\u503c\u63a8\u65ad\u51fa\u6765\u7684\uff0c\u56e0\u6b64\uff0c\u5728\u6ca1\u6709\u6307\u660e\u6570\u636e\u7c7b\u578b\u7684\u60c5\u51b5\u4e0b\uff0c\u5fc5\u987b\u8981\u7ed9\u51fa\u521d\u59cb\u503c\u3002<\/p> \n 
\u8bbf\u95ee\u4fee\u9970\u7b26<\/h2> \n 
\u7528private<\/strong>\u5173\u952e\u8bcd\u4fee\u9970\uff0c\u53ea\u80fd\u88ab\u5f53\u524d\u7c7b\u4ee5\u53ca\u5f53\u524d\u7c7b\u7684\u5185\u90e8\u7c7b\u8bbf\u95ee\u5230\uff0c\u5916\u5c42\u7c7b\u8bbf\u95ee\u4e0d\u5230\u3002<\/p> \n 
class Outer{\n    class Inner{\n        private def f(){\n            println("f")\n        }\n        class InnerMost{\n            f() \/\/ \u6b63\u786e\n        }\n    }\n    (new Inner).f() \/\/\u9519\u8bef\n}\n<\/code><\/pre> \n 
\u7528protected<\/strong>\u5173\u952e\u8bcd\u4fee\u9970\uff0c\u53ea\u80fd\u88ab\u5f53\u524d\u7c7b\u7684\u5b50\u7c7b\u8bbf\u95ee\u3002<\/p> \n 
package p {\n    class Super {\n        protected def f() {println("f")}\n    }\n    class Sub extends Super {\n        f()\n    }\n    class Other {\n        (new Super).f() \/\/\u9519\u8bef\n    }\n}\n<\/code><\/pre> \n 
\u6ca1\u6709\u6307\u5b9a\u4efb\u4f55\u4fee\u9970\u7b26\uff0c\u9ed8\u8ba4\u4e3apublic<\/strong>\uff0c\u5728\u4efb\u4f55\u5730\u65b9\u90fd\u53ef\u4ee5\u88ab\u8bbf\u95ee\u3002<\/p> \n 
\u6761\u4ef6\u548c\u5faa\u73af<\/h2> \n 
\u4ee5\u4e0b\u662fIF...ELSE\u8bed\u53e5\u5b9e\u4f8b\u3002<\/p> \n 
object Test {\n   def main(args: Array[String]) {\n      var x = 30;\n\n      if( x == 10 ){\n         println("X \u7684\u503c\u4e3a 10");\n      }else if( x == 20 ){\n         println("X \u7684\u503c\u4e3a 20");\n      }else if( x == 30 ){\n         println("X \u7684\u503c\u4e3a 30");\n      }else{\n         println("\u65e0\u6cd5\u5224\u65ad X \u7684\u503c");\n      }\n   }\n}\n<\/code><\/pre> \n 
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u4e86 i to j<\/strong> \u8bed\u6cd5(\u5305\u542b j)\u7684\u5b9e\u4f8b\uff0c\u7bad\u5934 <- \u7528\u4e8e\u4e3a\u53d8\u91cf a \u8d4b\u503c\u3002<\/p> \n 
object Test {\n   def main(args: Array[String]) {\n      var a = 0;\n      \/\/ for \u5faa\u73af\n      for( a <- 1 to 10){\n         println( "Value of a: " + a );\n      }\n   }\n}\n<\/code><\/pre> \n 
\u5728 for \u5faa\u73af<\/strong> \u4e2d\u4f60\u53ef\u4ee5\u4f7f\u7528\u5206\u53f7;\u6765\u8bbe\u7f6e\u591a\u4e2a\u533a\u95f4\uff0c\u5b83\u5c06\u8fed\u4ee3\u7ed9\u5b9a\u533a\u95f4\u6240\u6709\u7684\u53ef\u80fd\u503c\u3002<\/p> \n 
object Test {\n   def main(args: Array[String]) {\n      var a = 0;\n      var b = 0;\n      \/\/ for \u5faa\u73af\n      for( a <- 1 to 3; b <- 1 to 3){\n         println( "Value of a: " + a );\n         println( "Value of b: " + b );\n      }\n   }\n}\n<\/code><\/pre> \n 
for \u5faa\u73af\u96c6\u5408\u7684\u8bed\u6cd5\u5982\u4e0b\u3002<\/p> \n 
object Test {\n   def main(args: Array[String]) {\n      var a = 0;\n      val numList = List(1,2,3,4,5,6);\n\n      \/\/ for \u5faa\u73af\n      for( a <- numList ){\n         println( "Value of a: " + a );\n      }\n   }\n}\n<\/code><\/pre> \n 
\u4f60\u53ef\u4ee5\u5c06 for \u5faa\u73af\u7684\u8fd4\u56de\u503c\u4f5c\u4e3a\u4e00\u4e2a\u53d8\u91cf\u5b58\u50a8\u3002<\/p> \n 
object Test {\n   def main(args: Array[String]) {\n      var a = 0;\n      val numList = List(1,2,3,4,5,6,7,8,9,10);\n\n      \/\/ for \u5faa\u73af\n      var retVal = for{ a <- numList \n                        if a != 3; if a < 8\n                      }yield a\n\n      \/\/ \u8f93\u51fa\u8fd4\u56de\u503c\n      for( a <- retVal){\n         println( "Value of a: " + a );\n      }\n   }\n}\n<\/code><\/pre> \n 
\u51fd\u6570\u5f0f\u7f16\u7a0b\uff08\u91cd\u70b9\uff09<\/h2> \n 
\u51fd\u6570\u5f0f\u7f16\u7a0b<\/strong>\uff1a\u5bf9\u4e8e\u76f8\u540c\u7684\u8f93\u5165\u6c38\u8fdc\u4f1a\u5f97\u5230\u76f8\u540c\u7684\u8f93\u51fa,\u800c\u4e14\u6ca1\u6709\u4efb\u4f55\u53ef\u4ee5\u89c2\u5bdf\u7684\u526f\u4f5c\u7528,\u4e5f\u4e0d\u4f9d\u8d56\u5916\u90e8\u7684\u73af\u5883\u72b6\u6001\u3002\u53c2\u8003\u4ec0\u4e48\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\uff1f<\/a>\u3002<\/p> \n 
Scala\u4e2d\u51fd\u6570\u662f\u4e3a\u5b8c\u6210\u67d0\u4e00\u529f\u80fd\u7684","orderid":"0","title":"Scala(\u4e00)","smalltitle":"","mid":"0","fname":"Scala","special_id":"0","bak_id":"0","info":"0","hits":"588","pages":"5","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":"Scala<\/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","lastview":"1715518689","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}