School, 07.09.2017, Ex4, find two numbers with given sum

public class Ex4 {
    // Write a Java program to find the sum of the two elements of a given array
    // which is equal to a given integer.
    // Sample array: [8,1,2,4,5,6]
    // Target value: 6.

    public static void main(String[] args) {
        int[] arr = { 8, 1, 2, 4, 5, 6 };
        int sum = 6;
        boolean found = false;

        for (int i = 0; i < arr.length - 1; i += 1) {
            for (int j = i + 1; j < arr.length; j += 1) {
                if (arr[i] + arr[j] == sum) {
                    System.out.println(arr[i] + "+" + arr[j] + " = " + sum);
                    found = true;
                    // return;
                }
            }
        }

        if (found == false)
            System.out.println("There is no two numbers with sum of " + sum);

    }

}