Check for duplicate elements in an array

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import java.io.*;
import java.util.*;

class Enters {
  public static void main(String[] args) {

    Scanner scanner = new Scanner(System.in);

    ArrayList<Integer> arr = new ArrayList<Integer>();
    try{

       System.out.println("Enter numbers:");
        int i;
        int j;
        while (true) {
            int count = 0;
            int input = scanner.nextInt();
            arr.add(input);
         for (int temp : arr) {
            if(temp == input){
              count++;
            }
        }
        if(count==2){
          System.out.print("The number is entered twice.");

        }
        else if(count>2){
          System.out.println("The number is entered more than 2 times.");

        }
        }
    }catch(Exception e) {
    //  Block of code to handle errors(In this case it stops the program)

      System.out.println("End of the program!");

    }

  }
}