Java ArrayList for integers

Question

I have values that I\'d like to add into an ArrayList to keep track of what numbers have shown up. The values are integers so I created an ArrayList;

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Answer 1

Actually what u did is also not wrong your declaration is right . With your declaration JVM will create a ArrayList of integer arrays i.e each entry in arraylist correspond to an integer array hence your add function should pass a integer array as a parameter.

For Ex:

list.add(new Integer[3]);

In this way first entry of ArrayList is an integer array which can hold at max 3 values.