How to make user input 0 produce output "1234"

This is my code below. When I type in 0, it just outputs 0. I want it so that when you input 0, it outputs "1234". Can someone help? Thanks. I am unsure what I have done wrong here - but from the IF statement, I have it so that when the input is equal to 0, it should output "1234".

import java.util.Scanner;

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

       double number;
       Scanner user = new Scanner( System.in );
       System.out.print("Enter number: ");
       number = user.nextInt();
       double answer;    

       if (number % 2 == 0) {       
          answer = number * number;     
          System.out.println(answer);     
       } 
       else if (number == 0) {
          System.out.println("1234");
       }            
       else {        
          answer = number / 2;     
          System.out.println(answer);
       }    
    }
}