public static void main(String[] args) {

    ClacCombo(new int[] {5,5,15,10}, 15);

}

static void ClacCombo(int[] numbers, int target) {
    int count = 0;
    int n = 0;
    int newTarget = 0;
    newTarget = target;
    for (int i = 0; i < numbers.length; i++) {
        if (numbers[i] == target) {
            System.out.println(Arrays.toString(new int [] {i}));
            count++;
        }

        for (int j = i + 1; j < numbers.length; j++) {
            int sum = (numbers[j] + numbers[i]);

            //System.out.println(Arrays.toString(new int[] { i, j }));

            if (numbers[j] == (target - numbers[i])) {
                n = (target - numbers[i]);

                System.out.println(Arrays.toString(new int[] { i, j }));

                count++;
            }

        }

    }
    //ClacCombo(new int [] {1,2,3,4}, newTarget);
}