FIND THE UNIQUE ELEMENTS IN ARRAYS || COUNT DUPLICATES ELEMENT IN ARRAY||

import java.util.*;
class FindNumberOFDuplicate 
{    //Write a program to find the unique element in arrays.
public static void main(String[] args) 
{
int c=0;
int arr[]={10,20,20 ,30,40,50,10,20};
System.out.println("Original:"+Arrays.toString(arr));
System.out.print("Unique Element:");
for(int i=0;i<arr.length;i++){
           int j;
          for( j=0;j<i;j++){

            if(arr[i]==arr[j]){
c++;
break;
}
  }
  if(i==j){
           System.out.print(arr[i]+"  ");
  }
}
System.out.print("\nCount Duplicate:"+c);
System.out.println();
}
}

2. A second method to find the unique element in the array.


     import java.util.*;

class Unique2{ 

public static void main(String args[]){ 

          int arr[]={10 ,20, 30, 40 ,10 ,20, 30, 40};               HashSet hs=new HashSet<>();   

           for(int i=0;i<arr.length;i++){
            hs.add(arr[i]);  

  }   

 System.out.println(hs); 

}
}