Remove Duplicate Elements from an Integer Array in Java

Write a program in Java to remove all the duplicate elements in a one-dimensional array. The details of the class, its variables and member functions are given below:

Class name: Remove

Data members/instance variables:
a[]: integer array to store the elements
n: to store the size of the array

Methods:
Remove(int m): parameterized constructor to store n = m
void input(): to enter the elements in the array
void duplicate(): to remove all the duplicate elements from the array
void display(): to display the final array

Also write the main() method to create an object of the class and call the methods accordingly to enable the task.

import java.util.Scanner;
class Remove{
    int a[];
    int n;
    public Remove(int m){
        n = m;
        a = new int[n];
    }
    public void input(){
        Scanner in = new Scanner(System.in);
        System.out.println("Enter " + n + " elements:");
        for(int i = 0; i < a.length; i++)
            a[i] = Integer.parseInt(in.nextLine());
    }
    public void duplicate(){
        for(int i = 0; i < a.length - 1; i++){
            for(int j = i + 1; j < a.length; j++){
                if(a[i] == a[j])
                    a[j] = 0;
            }
        }
    }
    public void display(){
        for(int i = 0; i < a.length; i++){
            if(a[i] != 0)
                System.out.print(a[i] + " ");
        }
        System.out.println();
    }
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("How many elements? ");
        int size = Integer.parseInt(in.nextLine());
        Remove obj = new Remove(size);
        obj.input();
        obj.duplicate();
        obj.display();
    }
}