Write a program to find the first non-repeating number in an integer array using Java?

To find the first non-repeating number in an array −

• Construct count array to store count of each element in the given array with same length and with initial value 0 for all elements.
• Compare each element in the array with all other elements, except itself.
• If match occurs increment its value in the count array.
• Get the index of the first 0 in the count array and print the element in the input array at this index.

Example

import java.util.Arrays;
public class NonRpeatingArray {
   public static void main(String args[]) {
      int array[] = {114, 225, 669, 996, 336, 6547, 669, 225, 336, 669, 996, 669, 225 };
      System.out.println("");
      //Creating the count array
      int countArray[] = new int[array.length];
      for(int i=0; i

Output
[0, 2, 3, 1, 1, 0, 3, 2, 1, 3, 1, 3, 2]
114