Java - 列表中的对象是按值还是引用保存的？ [英] Java - Are objects in a list held by value or reference?

问题描述

简单的问题，Java中的列表是否按值或引用保存对象？如果我将一个对象放在一个列表中，然后更改其中一个值，那么列表中的那个值是否具有更新的值？

Simple question, does a list in Java hold objects by value or reference? If I place an object in a list and later on change one of its values, is the one in the list going to have the updated value?

推荐答案

Java中的列表是按值还是引用保存对象？

does a list in Java hold objects by value or reference?

List 是一个包含对象引用的有序集合。

The List is an ordered collection that contains object references.

如果我将一个对象放在一个列表中，稍后更改其中一个值，那么列表中的对象是否会更新值？

If I place an object in a list and later on change one of its values, is the one in the list going to have the updated value?

您只能更改/更新可变对象。您无法通过其引用更新 immutable （例如 List< String> ）对象。

You can change/update only mutable objects. You cannot update immutable (e.g List<String>) objects via their references.

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