ArrayList shallow copy clone, Kotlin

ArrayList shallow copy clone, Kotlin

import kotlin.collections.ArrayList

fun main() {
    var list = ArrayList<MyData>()
    for (i in 0..<3) {
        list.add(MyData(i, 0))
    }

    //浅拷贝list到copyList
    var copyList = list.clone()

    println(list)
    println(copyList)

    println("---")

    //改变list的值，然后观察copyList的值变化。
    list.forEachIndexed { index, myData ->
        myData.pos = index
    }

    list.removeAt(list.size - 1)

    println(list)
    println(copyList) //copyList里面的对象MyData的值和list一致，如果该元素存在。
}

data class MyData(var index: Int, var pos: Int)

[MyData(index=0, pos=0), MyData(index=1, pos=0), MyData(index=2, pos=0)]
[MyData(index=0, pos=0), MyData(index=1, pos=0), MyData(index=2, pos=0)]
---
[MyData(index=0, pos=0), MyData(index=1, pos=1)]
[MyData(index=0, pos=0), MyData(index=1, pos=1), MyData(index=2, pos=2)]

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