java - How to pass all integers from ArrayList into static int variable, deviding them with "|" sign?

Question

For instance, I have:

ArrayList<Integer> intList = new ArrayList<>(Arrays.asList(0,1,2,3));

And I need to get eventually this:

public static final int CATEGORY = 0 | 1 | 2 | 3; 

How can I pass these numbers to int like that?

Answer 1

The short answer is: You can't. In an int field, you can only store a single integer. The | you are using is a bitwise OR in Java. This means that 0 | 1 | 2 | 3 results in the bitwise OR of 00, 01, 10 and 11, being 11. If you want to store multiple integers, then the most common options to store them are inside an array (int[]) or a List.