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  • kotlin基本数据类型

    通过idea创建kotlin项目:

    创建kotlin文件

    package com.czhappy.chapter01
    
    var aBoolean:Boolean = true
    
    var anInt:Int = 9
    var anotherInt:Int = 0xFF
    var maxInt:Int = Int.MAX_VALUE
    var minInt:Int = Int.MIN_VALUE
    
    var aLong:Long = 1234
    var maxLong:Long = Long.MAX_VALUE
    var minLong:Long = Long.MIN_VALUE
    
    var aFloat:Float = 2.0f
    
    var aDouble:Double = 3.0
    
    var aShort:Short = 127
    
    var byte:Byte = 127
    
    var aChar:Char = '0'
    var bChar:Char = '中'
    
    var aString:String = "Hello"
    var bString:String = String(charArrayOf('H','e','l','l','o'))
    
    var aRange:IntRange = 0..10//[0,10]
    var bRanage:IntRange=0 until 10//[0,10)
    
    var aIntArray:IntArray = intArrayOf(1,3,5,7)
    var aCharArray:CharArray = charArrayOf('h', 'e', 'l' , 'l', 'o')
    var aStringArray:Array<String> = arrayOf("我", "是", "程序员")
    
    fun main(args: Array<String>) {
    
        println("hello world")
    
        println(aString == bString)//true
        println(aString === bString)//false
    
        var arg1:Int = 1
        var arg2:Int = 2
        println("" + arg1 + "+" + arg2 + "=" + (arg1+arg2))
        println("$arg1 + $arg2 = ${arg1+arg2}")
    
        println(50 in aRange)
        println(aRange.contains(50))
        for(i in aRange){
            print("$i ")
        }
    
        println()
    
        println(aIntArray.size)
        for(i in aIntArray){
            print("$i ")
        }
        println()
        println(aCharArray.joinToString(""))
        println(aIntArray.slice(1..2))
        println(aStringArray.joinToString(""))
    }

    运行结果:

    package com.czhappy.chapter01
    
    open class Human(face:String, voice:String){
        init {
            println("我new了一个${this.javaClass.simpleName},face:$face voice:$voice")
        }
    }
    
    class Man(face:String, voice:String):Human(face, voice)
    class Woman(face:String, voice:String):Human(face, voice)
    
    fun main(args: Array<String>) {
        var Jack:Man = Man("阳光", "浑厚")
        var Lucy:Woman = Woman("甜美", "动听")
        println(Jack is Human)
    }

    运行结果:

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  • 原文地址:https://www.cnblogs.com/chenzheng8975/p/9443102.html
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