Bean Array

A Bean array is defined to be an array where for every value n in the array, there is
 also an element n-1 or n+1 in the array.
  For example, {2, 10, 9, 3} is a Bean array because
 2 = 3-1
 10 = 9+1
 3 = 2 + 1
 9 = 10 -1
  Other Bean arrays include {2, 2, 3, 3, 3}, {1, 1, 1, 2, 1, 1} and {0, -1, 1}.
  The array {3, 4, 5, 7} is not a Bean array because of the value 7 which requires that the
 array contains either the value 6 (7-1) or 8 (7+1) but neither of these values are in the
 array. Write a function named isBean that returns 1 if its array argument is a Bean array.
 Otherwise it returns a 0.

 */
package dev;

/**
 *
 * @author Tej Bist
 */
public class BeanArray {

    public static void main(String arg[]) {
        System.out.println(new BeanArray().isBean(new int[]{3, 4, 5, 7}));
    }

    private int isBean(int[] nu) {
        for (int i = 0; i < nu.length; i++) {
            int count = 0;
            for (int j = 0; j < nu.length; j++) {
                if (nu[i] == (nu[j] - 1) || nu[i] == (nu[j] + 1)) {
                    count++;
                }
            }
            if (count == 0) {
                return 0;
            }
        }
        return 1;
    }
}