School, 07.09.2017, Ex3, print common items in two arrays

public class Ex3 {
    // Write a Java program to find the common elements between two arrays of
    // integers
    public static void main(String[] args) {
        int[] arr1 = { 1, 3, 7, 9, 15, 20, 6 };
        int[] arr2 = { 7, 9, 5, 6, 3, 2 };
        // output: 7, 9, 6, 3

        for (int i = 0; i < arr1.length; i += 1) {
            if (isExist(arr1[i], arr2))
                System.out.print(arr1[i] + " ");

            // for (int j = 0; j < arr2.length; j += 1) {
            // if (arr1[i] == arr2[j])
            // System.out.print(arr1[i] + " ");
            // }
        }

    }

    private static boolean isExist(int x, int[] arr) {
        for (int i = 0; i < arr.length; i += 1) {
            if (arr[i] == x)
                return true;
        }
        return false;
    }

}