How to make an array of integer arrays in Java?

Question

I have been trying to make an array of integer arrays. I know that the outer array will have length N whilst every integer array within in only needs to hold two values.

Originally, I made an ArrayList with an Integer array:

int[] intArray = new int[2];
ArrayList<IntArray> outerArray = new ArrayList<>();

I then proceeded to just make an ArrayList of Integer within another ArrayList:

ArrayList<ArrayList<Integer>> outerArray = new ArrayList<>();

I'm looking for something that looks like this if N = 3 and a,b,c are integers:

{{a1, a2}, {b1, b2}, {c1, c2}}

int[][] array = int[n][2]; ? You can then access, for example, array[1][0] — assylias
– assylias, Commented Mar 6, 2019 at 15:52

Łukasz Kochanowski · Accepted Answer · 2019-03-06 15:54:44Z

1

private int[][] array = new int[10][10];

And you wrote something like this :

ArrayList<ArrayList<Integer>>

This is not an array, but list. You might read this : https://www.geeksforgeeks.org/array-vs-arraylist-in-java/

answered Mar 6, 2019 at 15:54

Łukasz Kochanowski

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Ciprian · Accepted Answer · 2019-03-06 16:04:48Z

1

You can use this I think.

final int n = 5;
Integer[][] ints = new Integer[n][2];

answered Mar 6, 2019 at 16:04

Ciprian

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