Simple Java Menu

This is another simple Java example on how to implement a console menu interface with the user.
The steps are really simple.
In a loop:
a) A String which contains the menu options is printed.
b) A number from keyboard is read.
c) Using switch - case statement the correct method is called.
The following Java code is showing the above steps.

import java.util.Scanner;

public class SimpleMenu {
   public void start(){
       Scanner keyboard = new Scanner(System.in);
       int choice;
       String menu = "Options\n";
       menu+="1. Choice1\n";
       menu+="2. Choice2\n";
       menu+="3. Choice3\n";
       menu+="4. Exit\n";
       menu+="Select an option : ";
       while(true) {
      System.out.print(menu);
      choice = keyboard.nextInt();
           switch (choice) {
         case 1: choice1(); break;
         case 2: choice2(); break;
         case 3: choice3(); break;
         case 4: System.exit(0); break;
         default: 
                    System.out.println("Invalid choice.");
                    break;
           }
   }
   }
 
   private void choice1(){
 System.out.println("Menu example choice 1");
   }
   private void choice2(){
 System.out.println("Menu example choice 2");
   }
   private void choice3(){
 System.out.println("Menu example choice 3");
   }
 
   public static void main(String[] args) {
    new SimpleMenu().start();
   }
}