kotlin类似javalist map所谓c shape 或ios那边的字典的遍历循环和创建以及泛型

println("test length func :${getObjectLength("How long do i have, please?")}");
//geLength 会出现会重写的情况，应该是自动倒入了某些系统的类导致的。
    var list= listOf<String>("hello","apple","fuck","qssq");
    var list1= listOf<Any>("hello","apple","fuck","qssq",1,33,3);
    var list2= listOf("any ,or not any","xxx","ddd","dd",1,33,3);
    for(item in list){
        println("list current Item:${item}");
    }
    for(index in list.indices){
        println(" list current index :${index},item:${list.get(index)} items:${list[index]}");
    }
    println("test list1 length:${list1.size}")

    for(index in list2.indices){
        println(" list current index :${index},item:${list2.get(index)} items:${list2[index]}");

判断是否包含

//jugde  list is  contain str
//判断hello1是否等于list集合里面的某一个字符串(非关键字包含)
     var list= listOf<String>("hello","apple","fuck","qssq");
    if("hello" in  list){
        println("hello at list ");
    }else{
        println("hello not  at list ");

    }
    //jugde index at

    if(1 in list.indices){
        println("1 at list.indiices")
    }else{
        println("1 not  at list.indiices")


    }
    if(5 in 0..list.lastIndex){
        println("1 at list 0-${list.lastIndex}");
    }else{

        println("1 not at list 0-${list.lastIndex}");
    }

for (x in 12 downTo 0 step 3) {//print 12  9 6 3 0
        println("downTo "+x)
    }

    for (x in 0..12 step 2) {
        println("current:"+x)//0  2  4 6 xx  12
    }

map的打印和创建

var map= mapOf<Any,Any>(Pair("qssq","694886526"),Pair("qssq666","1234455"),Pair("qssqa","bbbbbbb"));
    for (entry in map) {
        println("test "+entry.key+",entry.value:"+entry.value);

    }
    map.forEach { t, u -> println("map.forEach key $t value  $u"); }
    for ((k, v) in map) {
        println("key:$k ->value: $v")
    }
    
    println("count:${map.size}");

更多参考百度