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Editorial Team
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Asked: 2026-06-06T18:04:06+00:00

I have the below java code: List<SomePojo> list = new ArrayList<SomePojo>(); //add 100 SomePojo

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I have the below java code:

List<SomePojo> list = new ArrayList<SomePojo>();
//add 100 SomePojo objects to list.

Now list has 100 objects.

If I create one more instance as below:

List<SomePojo> anotherList = new ArrayList<SomePojo>();
anotherList.addAll(list);

Now, how many objects will be in memory: 100 or 200 objects?

In the line below, are objects being added or only references?

anotherList.addAll(list);

If I make any change to list, do the same changes reflect to anotherList and vice-versa?

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1 Answer

  1. Editorial Team

    An object is only once in memory. Your first addition to list just adds the object references.

    anotherList.addAll will also just add the references. So still only 100 objects in memory.

    If you change list by adding/removing elements, anotherList won’t be changed. But if you change any object in list, then it’s content will be also changed, when accessing it from anotherList, because the same reference is being pointed to from both lists.

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