UniqueArrayElement

Find the unique array element/s...

package abc;

import java.util.ArrayList;

import java.util.Arrays;

public class Test {

       public static void main(String[] args) {

             // { 6, 1, 9, 2, 5, 6, 7, 4, 8, 3, 7, 5, 4, 2, 1 } //Find unique element in the array

             int[] num = { 6, 1, 9, 2, 5, 6, 7, 4, 8, 3, 7, 5, 4, 2, 1 };

             int numLength = num.length;

             ArrayList<Integer> alist = new ArrayList<>();

             for (int i = 0; i < numLength; i++) {

                    alist.add(num[i]);

             }

 

             ArrayList<Integer> alist1 = new ArrayList<>();// ArrayList of duplicate numbers

 

             System.out.println(Arrays.asList(num));// [[I@53bd815b]

             System.out.println(Arrays.toString(num));// [6, 1, 9, 2, 5, 6, 7, 4, 8, 3, 7, 5, 4, 2, 1]

             for (int i = 0; i < numLength; i++) {

                    for (int j = 0; j < numLength; j++) {

                           if (!(i == j)) {

                                 if ((num[i] == num[j])) {

                                        int x = num[i];

                                        int y = num[j];

                                        alist1.add(x);

                                        //alist1.add(y); no need of this, but having this there is no harm

                                 }

                           }

                    }

             }

             System.out.println("alist=" + alist);// [6, 1, 9, 2, 5, 6, 7, 4, 8, 3, 7, 5, 4, 2, 1]

             System.out.println("alist1=" + alist1);// [6, 1, 2, 5, 6, 7, 4, 7, 5, 4, 2, 1]

             alist.removeAll(alist1);

             System.out.println("alist-the unique elements = " + alist);// [9, 8, 3]

       }

}

Output:

[[I@4361bd48]

[6, 1, 9, 2, 5, 6, 7, 4, 8, 3, 7, 5, 4, 2, 1]

alist=[6, 1, 9, 2, 5, 6, 7, 4, 8, 3, 7, 5, 4, 2, 1]

alist1=[6, 1, 2, 5, 6, 7, 4, 7, 5, 4, 2, 1]

alist-the unique elements = [9, 8, 3]