Get all combinations of sum of numbers to result

 import java.util.Arrays;

public class AddTwo {

    public static void main(String[] args) {
        int[] ar={7, 7, 4, 3, 8};
        System.out.println(Arrays.toString(new AddTwo().sum(ar,10)));
    }

    public int[] sum(int[] arr,int num){
        int[] sumnum=new int[2];

        for(int i=0;i<arr.length;i++){
            for(int j=i+1;j<arr.length;j++){
                System.out.println("i="+i+" j="+j);
                if(arr[i]+arr[j]==num)
                {
                    sumnum[0]=arr[i];
                    sumnum[1]=arr[j];
                }
            }
        }

        return sumnum;
    }
}