Arraylist without remove object

Question

I have an Arraylist, for example

ArrayList<SomeType> newObjectList = new ArrayList<>();

I want to use an object from the Arraylist without using the method remove. I don't want to remove the object from the list, just to refer to it and use its methods.

How can I do this? Thanks.

I think OP wants to get a reference to an object from the list and when he sets that reference to null, the object must still be in the list. Or at least this is what I got from his explanation — user1817574
– user1817574, Commented Mar 9, 2017 at 13:26
when looking for desired functionality the public API documentation could be a useful resource... docs.oracle.com/javase/8/docs/api/java/util/List.html — Timothy Truckle
– Timothy Truckle, Commented Mar 9, 2017 at 13:28

Ocean15 · Accepted Answer · 2017-03-09 13:22:37Z

5

Use the method newObjectList.get(index) instead

Documentation

answered Mar 9, 2017 at 13:22

Ocean15

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Tamas Rev · Accepted Answer · 2017-03-09 13:27:07Z

0

You can disable the remove method using the Collections.unmodifiableList() construct:

List<Object> newObjectList = Collections.unmodifiableList(new ArrayList<Object>());

This will throw an UnsupportedOperationException when trying to add or remove an object.

answered Mar 9, 2017 at 13:27

Tamas Rev

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2 Comments

Dave Newton Over a year ago

I don't think the OP is asking to restrict removal, rather to reference a list item without removing it.

Tamas Rev Over a year ago

I don't know OP is asking for :) I.e. just referencing it without removing it - it's so simple, that nobody should ask that on SO. Thus I made a guess, like this might be relevant too.

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