如何克隆 ArrayList 并克隆其内容?

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如何克隆 ArrayList 并在 Java 中克隆其项目?

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

例如我有:

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

而且我希望 clonedList 中的对象与 Dogs 列表中的对象不同.

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

推荐答案

您将需要迭代这些项目，并一个一个地克隆它们，并在执行过程中将这些克隆体放入您的结果数组中.

You will need to iterate on the items, and clone them one by one, putting the clones in your result array as you go.

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; }

为了让它工作，显然，你必须让你的 Dog 类实现 Cloneable 接口并覆盖 clone()方法.

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