Java и клавиатура

 class YourKeyListener implements java.awt.event.KeyListener
 {
  public boolean isKeyPressed = false;
  public YourKeyListener(){}
 
  /**
   * in this methods you must check condition that you need and then 
   * sets the isKeyPressed variable to true
  */
  public keyTyped(KeyEvent e){...}
  public keyPressed(KeyEvent e){...}
  public keyReleased(KeyEvent e){...}
 }
 
 java.awt.yourComponent = ...;
 YourKeyListener yourKeyListener = new YourKeyListener();
 yourComponent.addKeyListener(yourKeyListener);
 
 Thread yourThread = ...;
 
 while(!yourKeyListener.isKeyPressed)
 {
  yourThread.sleep(1000);//wait for a second
 }

import java.lang.Thread;
import java.awt.event.*;
 
public class MyThread extends Thread {
    
    public static void main (String args[]){
       MyThread m = new MyThread();
    }
    
    public MyThread(){
        testKey();
        
    }
    
    public void testMyThread(){
    try{    
      this.run();
        for(int i=0;i<100;i++){
            System.out.println('Loop ' +i);
            if(i==50){
             System.out.println('Thread stopped');  
             this.sleep(5000);
             
            }
        }
    }
    catch(Exception e){}
    }
}

import java.lang.Thread;
 
public class MyThread extends Thread {
    
    public static void main (String args[]){
       MyThread m = new MyThread();
    }
    
    public MyThread(){
        testMyThread(){     
    }
    
    public void testMyThread(){
    try{    
      this.run();
        for(int i=0;i<100;i++){
            System.out.println('Loop ' +i);
            if(i==50){
             System.out.println('Thread stopped');  
             this.sleep(5000);
             
            }
        }
    }
    catch(Exception e){}
    }
}

BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String user_input = reader.readLine();
if(!(user_input.equals('')))
{
System.exit(0);
} 
else
{
}