School, 05.09.2017, Ex2, print array without duplicates

public class Ex2 {
    // Write a Java program to find the duplicate values of an array of integer
    // values
    public static void main(String[] args) {
        int[] arr = { 1, 7, 13, 9, 1, 5, 8, 7, 5, 9, 21 };
        // output: 1 7 13 9 5 8 21

        // print source array
        System.out.print("Source array : ");
        for (int i = 0; i < arr.length; i += 1) {
            System.out.print(arr[i] + " ");
        }
        System.out.println();

        // print without duplicates
        System.out.print("array without duplicates: ");
        for (int i = 0; i < arr.length; i += 1) {
            boolean print = true;
            for (int j = 0; j < i && print; j += 1) {
                if (arr[i] == arr[j]) {
                    print = false;
                }
            }
            if (print) {
                System.out.print(arr[i] + " ");
            }
        }

    }

}