Question

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How to create multidemensional arraylist in Java?

I have been having trouble understanding if and how an multidimensional Arraylist can be created. I know that from an ArrayList objects can be added,removed,checked, etc. and can be made two dimensionally, but can it be made 3 dimensionally.

• 2D ArrayList<object1,object2,object3>
• 3D ArrayList<>?

I know a regular array can be multidimensional simply by int[][] adding another set of brackets, but does an ArrayList work the same way?

Answer 1

ArrayList<ArrayList<Integer>> is an ArrayList containing ArrayLists consisting of Integers, in other words, a 3d integer ArrayList.