title: break a loop if Esc was pressed
body: <p>I have written a program in JAVA language which accepts inputs from console by using Scanner class....   </p>
  
  <p>now I want to add this ability to my code to exist a loop (while) when user presses Esc Button.
  so far I thought Keyboard class can help me but it was just like Scanner...I tried to use events but do not  know how to use them correctly....</p>
  
  <p>Source code:</p>
  
  <pre><code>    package switchCase_v1;
  
       import cs1.Keyboard;
       import java.util.EventObject;
       import java.awt.AWTEvent;
       import java.awt.event.KeyEvent;
       import java.awt.event.ComponentEvent;
       import java.awt.event.InputEvent;
       import java.util.*;
  
        public class SwithCase {
  
      public static void main(String[] args) {
          // TODO Auto-generated method stub
          Scanner input = new Scanner(System.in);
          System.out.println("enter the name or number of month: ");
          int monthNumber = input.nextInt();
  
          while (true) {
              KeyEvent button;
              if (button.getKeyCode() == 27)
                  break;
              else if (monthNumber == '\n') {
                  System.out.println("enter a number");
                  monthNumber = input.nextInt();
              } else {
                  switch (monthNumber) {
                  case 1:
                  case 2:
                  case 3:
                  case 4:
                  case 5:
                  case 6:
                      System.out.println("it has 31 days");
                      monthNumber = input.nextInt();
                      break;
                  case 7:
                  case 8:
                  case 9:
                  case 10:
                  case 11:
                  case 12:
                      System.out.println("it has 30 days");
                      monthNumber = input.nextInt();
                      break;
                  default:
                      System.out.println("it is not a valid number");
                      monthNumber = input.nextInt();
                      break;
                  }
              }
  
          }
      }
    }
  </code></pre>
  
  <p>How I can deal with cases when I want to take into consideration the hitting buttons like "Esc" or "Enter"? I think it should be also applicable by using ASCII codes.</p>
  
  <p>this is the new version of my code:</p>
  
  <pre><code>public static void main(String[] args) {
      // TODO Auto-generated method stub
  
      Scanner input = new Scanner(System.in);
      System.out.print("Check number of days");
      KeyEvent e;
      if (e.getKeyCode() == KeyEvent.VK_ENTER)
      {
      System.out.println("enter the name or number of month: ");
      int monthNumber=input.nextInt();
      }
      else if (Keyboard.getEventKey()==Keyboard.KEY_ESCAPE)
      {
          System.out.println("GoodBye");
      }
      }   
  </code></pre>
  
  <p>}</p>
  
  <p>but it has an error saying e object may not have been initialized...!!!!!what should I do?!!!</p>