Find duplicates in Array in java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

 public class arrayDuplicate {
 
               public static void main(String[] args) {
  
                           int[] number=new int[]{1,2,1,5,6,8,2};
  
                           for(int i=0;i<=number.length-1;i++){

                                for(int j=0;j<=number.length-1;j++){

                                     if(number[i]==number[j] && i!=j){

                                           System.out.println("Duplicate number: "+number[i]);

                                     }

                                }

                            }   
             }

 }