Why is keyPressed() not being executed in this code..??

Question

HI,
I am trying to develop a simple game program but what is banging my head is the keyPressed(KeyEvent evnt) is not being executed, i.e. the System.out.println("XXXX") inside this method is not being reached and hence shows no any output. Any suggestion would be appriciated. The code goes like this....
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import java.awt.event.*;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.*;
public class ArrowGame
  static GameField gfield;
  private static void createGUI()
    JFrame.setDefaultLookAndFeelDecorated(true);
     JFrame frame=new JFrame("Arrow Game");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gfield=new GameField();
     frame.getContentPane().add(gfield,BorderLayout.CENTER);
     frame.setVisible(true);
     frame.pack();
  public static void main(String args[])
    SwingUtilities.invokeLater(new Runnable()
       public void run()
         createGUI();
  static class GameField extends JPanel implements ActionListener, KeyListener, MouseListener
    Timer timer;
    int w,h;
     int arrowPos;
     double dynamicX=1.5;
     double ovalX;
     final double ovalY=2.0;
     final double ovalW=45.0;
     final double ovalH=45.0;
     double ovalXX=(ovalX+10);
     final double ovalYY=(ovalY+10);
     double ovalXXX=(ovalXX+10);
     final double ovalYYY=(ovalYY+10);
     private boolean shotTriggered=false;
    GameField()
       setPreferredSize(new Dimension(525,450));
       addMouseListener(this);
       addKeyListener(this);
     public void paintComponent(Graphics g)
       super.paintComponent(g);
      w=getWidth();
       h=getHeight();
       Graphics2D g2=(Graphics2D)g;
      g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
       g2.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
       g2.setColor(Color.darkGray);
       g2.fillRect(0,0,w,h);
       drawTarget(g2,w,h);
       drawArrow(g2,w,h);
     private void drawTarget(Graphics2D g2,int w,int h)
       ovalX+=dynamicX;
       ovalXX+=dynamicX;
       ovalXXX+=dynamicX;
       if (ovalX < 0 && ovalXX < 10 && ovalXXX < 20)
         ovalX=0;
          ovalXX=10;
          ovalXXX=20;
         dynamicX=1.5;
       else if (ovalX > (w-45) && ovalXX > (w-35) && ovalXXX > (w-25))
          ovalX=(w-45);
          ovalXX=(w-35);
          ovalXXX=(w-25);
          dynamicX=-1.5;
       g2.setColor(Color.green);
       g2.fill(new Ellipse2D.Double(ovalX,ovalY,ovalW,ovalH));
       g2.setColor(Color.blue);
       g2.fill(new Ellipse2D.Double(ovalXX,ovalYY,(ovalW-20),(ovalH-20)));
       g2.setColor(Color.red);
       g2.fill(new Ellipse2D.Double(ovalXXX,ovalYYY,(ovalW-40),(ovalH-40)));
     private void drawArrow(Graphics2D g2,int w,int h)
       arrowPos=w/2;
       g2.setColor(Color.white);
       g2.drawLine(arrowPos,((h/2)+175),arrowPos,h);
     public void keyPressed(KeyEvent evnt)
       int code=evnt.getKeyCode();
       System.out.println(code);
     public void keyTyped(KeyEvent evnt){}
     public void keyReleased(KeyEvent evnt){}
     public void mousePressed(MouseEvent evt)
       if (timer!=null)
         timer.stop();
          timer=null;
       else
         timer=new Timer(75,this);
         timer.start();
     public void mouseReleased(MouseEvent evt){}
     public void mouseEntered(MouseEvent evt){}
     public void mouseExited(MouseEvent evt){}
     public void mouseClicked(MouseEvent evt){}
     public void actionPerformed(ActionEvent event)
       repaint();
};regards,
Jay

Answer 1

  GameField()
    setPreferredSize(new Dimension(525,450));
    setFocusable(true); //<-----------------------------------------
    addMouseListener(this);
    addKeyListener(this);
  }