KeyListener implementation problems

Question

Hi,
I'm working on a project for my Java class and I'm starting with a simple program and implementing each new part as I go along because I need to learn most of it by myself, the teacher is an idiot. Anyways, the program is a tetris game and I need it to be able to identify when the user presses the directional keys for movement and rotation. I know I need to implement a KeyListener, but when I set it up, I get this error:
.\tetris.java:28: game_panel is not abstract and does not override abstract method keyPressed(java.awt.event.KeyEvent) in java.awt.event.KeyListener class game_panel extends JPanel implements KeyListener
^
Here is the class where I implemented the KeyListener:
class game_panel extends JPanel implements KeyListener
     public game_panel()
          setPreferredSize(new Dimension(300,600));
          setBackground(Color.black);
          setFocusable(true);
          addKeyListener(this);
     public void paintComponent(Graphics g)
          super.paintComponent(g);
          g.drawRect(0,0, getSize().width - 1, getSize().height - 1);
     public void keyReleased(KeyEvent e)
          if(e.getKeyCode()==KeyEvent.VK_RIGHT)
               System.out.println("Right key pressed");
}Its pretty basic, but I don't think I'm missing any parts. The game_panel class is instantiated here:
public class tetris extends JApplet
     public void init()
          setLayout(new FlowLayout());
          JPanel panel = new game_panel();
          JPanel panel2 = new control_panel();
          add(panel);
          add(panel2);
}Any ideas? It could be something simple, I have no clue what is wrong? Thanks ahead of time.

Answer 1

KeyListener is an Interface. When you implement an interface, you must define all methods that are in the interface.
Link:
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/event/KeyListener.html
KeyListener contains 3 methods you must define bodies for.
It looks like you have defined 1 of them so far.
     public void keyReleased(KeyEvent e)Now you need the other two.