I have the following java program that responds to mouse clicks and mouse movements. It is working as I wanted. The code appears below.

import javax.swing.*;
import java.awt.event.*;
public class Z_MouseAndMotionListener extends JPanel  {
  public Z_MouseAndMotionListener() {
     Mouse m = new Mouse();
     addMouseListener(m);
     addMouseMotionListener(m);
  }
  class Mouse implements  MouseListener, MouseMotionListener{
     public void mousePressed(MouseEvent e) {
        System.out.println("Pressed");
 }
 public void mouseMoved(MouseEvent e) {
    System.out.println("Moved");
 }
 public void mouseDragged(MouseEvent e) {}
 public void mouseClicked(MouseEvent e) {}
 public void mouseEntered(MouseEvent e) {}
 public void mouseExited(MouseEvent e) {}
 public void mouseReleased(MouseEvent e) {}
 }
 public static void main(String[] args) {
 JFrame frame = new JFrame();
 frame.setSize(500, 500);
 frame.setLocationRelativeTo(null);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setContentPane(new Z_MouseAndMotionListener());
 frame.setVisible(true);
 }
 } 

Now I want to implement keyListener also in the same program.
For that I used the following program(a slightly modified version of the earlier program
displayed above.

import javax.swing.*;
import java.awt.event.*;
public class Z_MouseAndMotionListener1 extends JPanel {
public Z_MouseAndMotionListener1() {
 Mouse m = new Mouse();
 addMouseListener(m);
 addMouseMotionListener(m);
 }
 class Mouse implements MouseListener, MouseMotionListener{
 public void mousePressed(MouseEvent e) {
    System.out.println("Pressed");
 }
 public void mouseMoved(MouseEvent e) {
    System.out.println("Moved");       
 }
 public void mouseDragged(MouseEvent e) {}
 public void mouseClicked(MouseEvent e) {}
 public void mouseEntered(MouseEvent e) {}
 public void mouseExited(MouseEvent e) {}
 public void mouseReleased(MouseEvent e) {}
 }
 public class KeyEvents extends JPanel implements KeyListener{
 //addKeyListener;

 @override
 public void keyPressed(KeyEvent ke) {
 } 
 }
 public static void main(String[] args) {
 JFrame frame = new JFrame();
 frame.setSize(500, 500);
 frame.setLocationRelativeTo(null);
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setContentPane(new Z_MouseAndMotionListener1());
 frame.setVisible(true);
 }
 }

 when I try to compile,Iget the error message "Z_MouseAndMotionListener1.java:22: error:      
 Z_MouseAndMotionListener1.KeyEvents is not abstract and does not override abstract method 
  keyReleased(KeyEvent) in KeyListener
 public class KeyEvents extends JPanel implements KeyListener{
      ^"

 Can someone please help me in implementing mouse and key Listeners?