kotlin when (while)循环

3 kotlin when 循环

相比于Java,Android中的while,kotlin的when更强大,可以直接给变量赋值

    var level = 26

    when (level) {
        26, 27 -> {
            println("android Oreo")
        }
        24, 25 -> println("android nougat")
        23 -> {
            println("android mars")
        }
        else -> {
            println("android 5一下")
        }
    }

    //when 可以赋值

    var content33 = when (level) {
        26, 27 -> "andoird oreo"
        else -> "android 5yixia"
    }
    println("$content33")

    // when is 判断
    var obj = null
    when (obj) {
        is Int -> println("obj是整形类型")
        is String -> println("obj是字符串类型")
        is Boolean -> println("obj是boolean")
        else -> println("Unknown type")
    }

    //while do-while for
    println("循环便利店。。。。 ")
    var count = 5
    while (count > 0) {
        println("1:$count")
        count--

    }
    //do -while
    count = 5
    do {
        println("2 $count")
        count--
    } while (count > 0)

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