简书链接:kotlin类似javalistmap所谓cshape或ios那边的字典的遍历循环和创建以及泛型
文章字数：161,阅读全文大约需要1分钟

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

    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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
        //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}");
    }
    
1
2
3
4
5
6
7
8

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

1
2
3
4
5
6
7
8
9
10
11
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