Java - Add an element between two elements in arraylist

Question

i want to add an element between two other elements in an arraylist like:

Element 1
Element 2
Element 3

Adding an element:

Element 1
Element 4 <---- Adding element 4 between 1 and 2.
Element 2
Element 3

Is this possible?

Jon Skeet · Accepted Answer · 2020-04-28 08:46:52Z

5

Yes - you want the overload of add that takes an index. In this case, the index would be 1:

list.add(1, 4); // Index then value

Note that adding an element involves copying all existing elements after that (so values 2 and 3 in your example), so if you do this a lot with a very large list, it can have performance implications.

answered Apr 28, 2020 at 8:46

Jon Skeet

1.5m893 gold badges9.3k silver badges9.3k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

hpopiolkiewicz · Accepted Answer · 2020-04-28 08:47:21Z

3

Simple as that:

myList.add(1, "Element 4");

See this documentation for further details.

answered Apr 28, 2020 at 8:47

hpopiolkiewicz

3,6474 gold badges26 silver badges39 bronze badges

Comments

coderfromhell · Accepted Answer · 2020-04-28 08:50:57Z

3

Yes, you can use the add() method of ArrayList to insert an element at any particular index.

Assuming the name of your ArrayList is list, you can add 4 at index 1 in this manner-

list.add(1, 4);

The first parameter takes the index and the second parameter takes the value of the element you want to insert.

answered Apr 28, 2020 at 8:50

coderfromhell

4551 gold badge4 silver badges15 bronze badges

Collectives™ on Stack Overflow

Java - Add an element between two elements in arraylist

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related