Help with pong game

Hi , I am trying to build a pong game. I just need to find some type of Keylistener that will help me know what the person typed. Like I know what they typed if I add a textbox, but I want them to type anywhere in my window and for my program to still be able to know what they did.

Eric

There are several ways to approach this.

Implement KeyListener:

Code:

---

import java.applet.Applet;
 
 import java.awt.event.KeyListener;
 import java.awt.event.KeyEvent;
 
 public class KeyListenerExample extends Applet implements KeyListener {
    public void init() {
        addKeyListener(this);
    }
   
    public void keyPressed(KeyEvent e) {
        System.out.println("keyPressed: " + e.getKeyChar());
    }
   
    public void keyTyped(KeyEvent e) {
        System.out.println("keyTyped: " + e.getKeyChar());
    }
   
    public void keyReleased(KeyEvent e) {
        System.out.println("keyReleased: " + e.getKeyChar());
    }
 }

---

Create an inner private class that extends a class that implements KeyListener, or that implements KeyListener itself:

Code:

---

import java.applet.Applet;
 
 import java.awt.event.KeyAdapter;
 import java.awt.event.KeyEvent;
 
 public class KeyListenerExample extends Applet {
    public void init() {
        addKeyListener(new MyKeyListener());
    }
   
    private class MyKeyListener extends KeyAdapter {
        public void keyPressed(KeyEvent e) {
            System.out.println("keyPressed: " + e.getKeyChar());
        }
   
        public void keyTyped(KeyEvent e) {
            System.out.println("keyTyped: " + e.getKeyChar());
        }
   
        public void keyReleased(KeyEvent e) {
            System.out.println("keyReleased: " + e.getKeyChar());
        }
    }
 }

---

Create an anonymous inner class:

Code:

---

import java.applet.Applet;
 
 import java.awt.event.KeyListener;
 import java.awt.event.KeyEvent;
 
 public class KeyListenerExample extends Applet {
    public void init() {
        addKeyListener(new KeyListener() {
            public void keyPressed(KeyEvent e) {
                System.out.println("keyPressed: " + e.getKeyChar());
            }
           
            public void keyTyped(KeyEvent e) {
                System.out.println("keyTyped: " + e.getKeyChar());
            }
           
            public void keyReleased(KeyEvent e) {
                System.out.println("keyReleased: " + e.getKeyChar());
            }
        });
    }
 }

---

Greetings.

Marcus:cool:

If you look at the JFrame API, you'll notice that it inherits from Component, which provides the addKeyListener(KeyListener) method.
JFrame

Code:

---

import java.awt.Container;
 import java.awt.Dimension;
 import java.awt.event.KeyListener;
 import java.awt.event.KeyEvent;
 
 import javax.swing.JFrame;
 import javax.swing.JPanel;
 
 public class KeyListenerExample extends JFrame {
    public KeyListenerExample() {
        super ("KeyListener Example");
       
        JPanel panel = (JPanel) getContentPane();
        panel.setPreferredSize(new Dimension(800, 600));
        panel.setLayout(null);
       
        pack();
        setResizable(false);
        setVisible(true);
 
        addKeyListener(new KeyListener() {
            public void keyPressed(KeyEvent e) {
                System.out.println("keyPressed: " + e.getKeyChar());
            }
           
            public void keyTyped(KeyEvent e) {
                System.out.println("keyTyped: " + e.getKeyChar());
            }
           
            public void keyReleased(KeyEvent e) {
                System.out.println("keyReleased: " + e.getKeyChar());
            }
        });
      }
   
    static public void main(String[] args) {
          new KeyListenerExample();
      }
 }

---

Greetings.

Felissa:p