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

Here there are two different concepts that are merged togather in your question.

First : Add Integer array into List. Code is as follows.

List list = new ArrayList<>();
Integer[] intArray1 = new Integer[] {2, 4};
Integer[] intArray2 = new Integer[] {2, 5};
Integer[] intArray3 = new Integer[] {3, 3};
Collections.addAll(list, intArray1, intArray2, intArray3);

Second : Add integer value in list.

List list = new ArrayList<>();
int x = 5
list.add(x);