列表对象是否通过引用传递? [英] Does a List object get passed by reference?

问题描述

可能重复:
是Java的引用引用吗?

Possible Duplicate:
Is Java pass-by-reference?

List对象是否通过引用传递?换句话说，如果我将ArrayList (java.util.ArrayList)对象传递给类，更改该对象时是否会自动更新该对象?

Does a List object get passed by reference? In other words, if I pass an ArrayList (java.util.ArrayList) object to a class, will it be automatically updated when I change it?

推荐答案

换句话说:如果我将ArrayList(java.util.ArrayList)对象传递给类，那么在更改它时会自动更新它吗?

in other word: If I pass an ArrayList (java.util.ArrayList) object to a class, will it be automatically updated when I change it?

是

列表对象是否通过引用传递?

Does the List object passed by reference?

引用值将被传递

public updateList(List<String> names){
 //..
}

说明

当您调用updateList(someOtherList);时，作为引用的someOtherList的值将被复制到names(方法中的另一个引用，一点一点地)，因此现在它们两个都引用内存中的同一实例，因此会改变

When you call updateList(someOtherList); the value of someOtherList which is a reference will copied to names (another reference in method, bit by bit) so now both of them are referring to same instance in memory and thus it will change

请参见

• 是Java的"pass-by-reference"或按值传递"?

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