Ich bin gerade dabei tetris zu programmieren (Anfangsphase) habe allerdings ein Problem der KeyListener funktioniert nicht und ich weiß nicht warum bitte um Hilfe 
Java:
public class GameGUI extends javax.swing.JFrame implements Runnable, KeyListener {
int gamefield[][] = new int[11][21];
Game game;
Thread t;
int x = 0;
int y = 10;
int gf_x=0;
int gf_y=0;
Graphics2D g;
/**
* Creates new form GameGUI
*/
public GameGUI() {
initComponents();
try {
UIManager.setLookAndFeel(new NimbusLookAndFeel());
SwingUtilities.updateComponentTreeUI(this);
} catch (UnsupportedLookAndFeelException ex) {
}
this.addKeyListener(this);
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jpyou = new javax.swing.JPanel();
jpopponent = new javax.swing.JPanel();
jPanel3 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jpyou.setBorder(javax.swing.BorderFactory.createTitledBorder("You"));
javax.swing.GroupLayout jpyouLayout = new javax.swing.GroupLayout(jpyou);
jpyou.setLayout(jpyouLayout);
jpyouLayout.setHorizontalGroup(
jpyouLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 419, Short.MAX_VALUE)
);
jpyouLayout.setVerticalGroup(
jpyouLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jpopponent.setBorder(javax.swing.BorderFactory.createTitledBorder("Opponent"));
javax.swing.GroupLayout jpopponentLayout = new javax.swing.GroupLayout(jpopponent);
jpopponent.setLayout(jpopponentLayout);
jpopponentLayout.setHorizontalGroup(
jpopponentLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jpopponentLayout.setVerticalGroup(
jpopponentLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 0, Short.MAX_VALUE)
);
jPanel3.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0), 1, true));
javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
jPanel3.setLayout(jPanel3Layout);
jPanel3Layout.setHorizontalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 79, Short.MAX_VALUE)
);
jPanel3Layout.setVerticalGroup(
jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 54, Short.MAX_VALUE)
);
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
jLabel1.setText("Time");
jButton1.setText("Start");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jMenu1.setText("File");
jMenuBar1.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar1.add(jMenu2);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jpyou, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(46, 46, 46)
.addComponent(jpopponent, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addContainerGap())
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(70, 70, 70)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 223, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 30, Short.MAX_VALUE)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 349, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(292, 292, 292))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jpyou, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jpopponent, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 528, Short.MAX_VALUE)))
.addContainerGap())
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
game = new Game();
for(int i=0;i<11;i++)
{
gamefield[i][20]=1;
}
t = new Thread(this);
t.start();
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* [url=http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html]How to Set the Look and Feel (The Java™ Tutorials > Creating a GUI With JFC/Swing > Modifying the Look and Feel)[/url]
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(GameGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(GameGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(GameGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(GameGUI.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new GameGUI().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JPanel jPanel3;
private javax.swing.JPanel jpopponent;
private javax.swing.JPanel jpyou;
// End of variables declaration
@Override
public void run() {
x = this.jpyou.getWidth() / 2;
y = 20;
gf_x=5;
gf_y=0;
while (!t.isInterrupted()) {
g = (Graphics2D) this.jpyou.getGraphics();
try {
String stone = game.getStone();
// if(stone.equals("viereck"))
// {
// x=5;y=0;
// gamefield[x][y]=1;
// gamefield[x+1][y]=1;
// gamefield[x][y+1]=1;
// gamefield[x+1][y+1]=1;
// }else if(stone.equals("L"))
// {
// x=5;y=0;
// gamefield[x][y]=1;
// gamefield[x][y+1]=1;
// gamefield[x][y+2]=1;
// gamefield[x+1][y+2]=1;
// }else if(stone.equals("J"))
// {
// x=5;y=0;
// gamefield[x][y]=1;
// gamefield[x][y+1]=1;
// gamefield[x][y+2]=1;
// gamefield[x-1][y+2]=1;
// }else if(stone.equals("z-left"))
// {
// x=5;y=0;
// gamefield[x][y]=1;
// gamefield[x+1][y]=1;
// gamefield[x+1][y+1]=1;
// gamefield[x+2][y+1]=1;
// }else if(stone.equals("z-right"))
// {
// x=5;y=0;
// gamefield[x][y]=1;
// gamefield[x+1][y]=1;
// gamefield[x][y+1]=1;
// gamefield[x-1][y+1]=1;
// }else if(stone.equals("t"))
// {
// x=5;y=0;
// gamefield[x][y]=1;
// gamefield[x-1][y+1]=1;
// gamefield[x][y+1]=1;
// gamefield[x+1][y+1]=1;
// }else if(stone.equals("I"))
// {
// x=3;y=0;
// gamefield[x][y]=1;
// gamefield[x+1][y]=1;
// gamefield[x+2][y]=1;
// gamefield[x+3][y]=1;
// }
if(gamefield[gf_x][gf_y+1]==1)
{
gamefield[gf_x][gf_y-1]=1;
y=20;gf_y=0;
}
g.setXORMode(Color.white);
g.setColor(Color.red);
g.fillRect(x, y, 18, 18);
g.fillRect(x + 20, y, 18, 18);
g.fillRect(x + 20, y - 20, 18,18 );
g.fillRect(x, y - 20, 18, 18);
y += 20;gf_y++;
g.fillRect(x, y, 18, 18);
g.fillRect(x + 20, y, 18, 18);
g.fillRect(x + 20, y - 20, 18,18 );
g.fillRect(x, y - 20, 18, 18);
g.setXORMode(Color.red);
t.sleep(500);
} catch (InterruptedException ex) {
JOptionPane.showMessageDialog(null, ex.getMessage());
}
}
}
@Override
public void keyTyped(KeyEvent e) {
System.out.println(e.getKeyChar() + " pressed");
}
@Override
public void keyPressed(KeyEvent e) {
System.out.println(e.getKeyChar() + " pressed");
int taste = e.getKeyCode();
if (taste == KeyEvent.VK_RIGHT) {
x += 10;
}
if (taste == KeyEvent.VK_LEFT) {
x -= 10;
}
}
@Override
public void keyReleased(KeyEvent e) {
System.out.println(e.getKeyChar() + " pressed");
}
}
