ArrayList浅拷贝clone，Kotlin

旧城等待， 2023-10-14 13:07 83阅读 0赞

### ArrayList浅拷贝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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