Kotlin使用循环结构

1.for循环

//方法1
for(arg in args){
    //TODO 
}

//方法2
for(arg in args)
//TODO

//方法3，直接使用索引
for (i in array.indices) {
    print(array[i])
}

//方法4，直接根据索引获取值
for ((index, value) in array.withIndex()) {
    println("the element at $index is $value")
}

2.while循环

while (x > 0) {
    x--
}

do {
    val y = retrieveData()
} while (y != null) // y is visible here!