如何克隆ArrayList并克隆其内容？ [英] How to clone ArrayList and also clone its contents?

问题描述

如何克隆 ArrayList 并且还可以在Java中克隆它的项目？

How can I clone an ArrayList and also clone its items in Java?

ArrayList<Dog> dogs = getDogs();
ArrayList<Dog> clonedList = ....something to do with dogs....

clonedList 与狗列表中的不一样。

And I would expect that objects in clonedList are not the same as in dogs list.

推荐答案

public static List<Dog> cloneList(List<Dog> list) {
    List<Dog> clone = new ArrayList<Dog>(list.size());
    for (Dog item : list) clone.add(item.clone());
    return clone;
}

为了工作，显然，你必须得到你的Dog对象实现Cloneable接口和clone（）方法。

For that to work, obviously, you will have to get your Dog object to implement the Cloneable interface, and the clone() method.

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