Java-Removing_Duplicate-elements_from_array.txt

//IDENTIFY UNIQUE ELEMENTS FROM A GIVEN ARRAY

//APPROACH 1 - USING ARRAYLIST (WITH CONTAINS MATHOD)

import java.util.*;
public class RemoveDuplicate{
    
    public static ArrayList<Integer> unique(ArrayList<Integer> list){
        ArrayList<Integer> al = new ArrayList<Integer>();
        
        for(Integer l:list){
            if(!al.contains(l)){
                al.add(l);
            }
        }
        return al;
        
    }
    
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the digit for size of array");
        int size = sc.nextInt();
        
        System.out.println("size of array :- "+size);
        Integer[] arr= new Integer[size];
       for(int i =0; i<arr.length; i++){
            
             arr[i] =sc.nextInt();
        }
         System.out.print("Array Entered is:- ");
        
        for(int j = 0; j < arr.length; j++) {
            System.out.print(arr[j]+" ");}
    
        ArrayList<Integer> list= new ArrayList<Integer>(Arrays.asList(arr));
        System.out.println();
        
        System.out.println("ArrayList with duplicates: "+ list); 
        ArrayList<Integer> alInt = unique(list);
        System.out.println("ArrayList of Unique Elements:- "+alInt);
        
    }
}

INPUTS:- 5 // ARRAY SIZE
		2 // ARRAY ELEMENTS
		1
		3
		2
		3
OUTPUT:- 
		Enter the digit for size of array
		size of array :- 5
		Array Entered is:- 2 1 3 2 3 
		ArrayList with duplicates: [2, 1, 3, 2, 3]
		ArrayList of Unique Elements:- [2, 1, 3]
	
	
//APPROACH 2 - USING LinkedHashSet for identifying unique elements in a given ArrayList\

//Set internaly implements HashMap and this makes Set to contain unique elements only

	 import java.util.*;
	public class RemoveDuplicate{
		
		public static ArrayList<Integer> unique(ArrayList<Integer> list){
			/*ArrayList<Integer> al = new ArrayList<Integer>();
			
			for(Integer l:list){
				if(!al.contains(l)){
					al.add(l);
				}
			}*/
			Set<Integer> hs = new LinkedHashSet<Integer>();
			hs.addAll(list);
			list.clear();
			list.addAll(hs);
			return list;
			
		}
		
		public static void main(String args[]){
			Scanner sc = new Scanner(System.in);
			System.out.println("Enter the digit for size of array");
			int size = sc.nextInt();
		  
			.
			.
			...
			
		}
	}