Java Array, Finding Duplicates

Question

I have an array, and am looking for duplicates.

duplicates = false;
for(j = 0; j < zipcodeList.length; j++){
    for(k = 0; k < zipcodeList.length; k++         


        

Answer 1

Print all the duplicate elements. Output -1 when no repeating elements are found.

import java.util.*;

public class PrintDuplicate {

    public static void main(String args[]){
        HashMap h = new HashMap();


        Scanner s=new Scanner(System.in);
        int ii=s.nextInt();
        int k=s.nextInt();
        int[] arr=new  int[k];
        int[] arr1=new  int[k];
        int l=0;
        for(int i=0; i0)
        { 
            for(int i=0;i