Find Unique Number in Array

 If all numbers repeated except one:

Use XOR operator

public class progprac {
    public static void main(String[] args) {
        int[] arr = {2, 3, 2, 4, 4};
        int result=0;

        for(int num : arr) {
            result = result ^ num;
        }
        System.out.println("Result="+result);
    }
}