Display.java

// This class does something with the board. I don't completely understand it, our teacher wrote it
package ui;

import centipede.Main;

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;


/**
 * Class description
 *
 *
 * @version        Enter version here..., 2011.04.06 at 12:34:59 CDT
 * @author         Enter your name here...
 */
public class Display extends JFrame implements KeyListener {

  /** TODO Field description */
  private Main main;

  /** TODO Field description */
  private JTextArea textBoard;

  /**
   * Creates new Display
   * @param height
   * @param width
   * @param main
   */
  public Display(int height, int width, Main main) {
    this.main = main;
    textBoard = new JTextArea();

    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    textBoard.setColumns(width + 1);
    textBoard.setRows(height);
    textBoard.setEditable(false);
    textBoard.setFont(new java.awt.Font("Monospaced", 0, 12));
    textBoard.setLineWrap(true);
    textBoard.setAutoscrolls(false);
    textBoard.addKeyListener(this);

    setTitle("Centipede Game");
    add(textBoard);

    pack();
    setResizable(false);
  }

  /**
   * Handle the key typed event from the text field.
   * @param e
   */
  public void keyTyped(KeyEvent e) {}

  /**
   * Handle the key pressed event from the text field.
   * @param e
   */
  public void keyPressed(KeyEvent e) {
    main.moveRight();
  }

  /**
   * Handle the key released event from the text field.
   * @param e
   */
  public void keyReleased(KeyEvent e) {
    main.moveLeft();
  }

  /**
   * TODO Method description
   *
   * @return
   */
  public JTextArea getTextBoard() {
    return textBoard;
  }
}

Main.java

//This is our main class
package centipede;

import ui.Display;
import ui.Centipede;

import javax.swing.JTextArea;


/**
 * Class description
 *
 *
 * @version        Enter version here..., 2011.04.06 at 12:19:46 CDT
 * @author         Enter your name here...
 */
public class Main {

  /** TODO Field description */
  private static final int HEIGHT = 40;

  /** TODO Field description */
  private static final int WIDTH = 20;

  /** TODO Field description */
  private int location = 0;

  /**
   *  @param args the command line arguments
   *  @throws InterruptedException
   */
  public static void main(String[] args) throws InterruptedException {
    new Main().run();
  }

  /**
   * TODO Method description
   *
   * @throws InterruptedException
   */
  private void run() throws InterruptedException {
    Display   display   = new Display(WIDTH, HEIGHT, this);
    JTextArea textBoard = display.getTextBoard();
    //textBoard.setText("0123456789012345678901234567890123456789012345678901234567890123456789");

    display.setVisible(true);

    Thread.sleep(2000);

    //This draws a centipede and makes it move across the board
    StringBuffer sb = new StringBuffer(WIDTH * HEIGHT);
    for (int i = 0; i < WIDTH * HEIGHT; i++) {
      sb.append(' ');

    }

    for (int i = 3; i < WIDTH * HEIGHT; i++) {
      sb.setCharAt(i - 3, ' ');
      Thread.sleep(50);

      sb.setCharAt(i, '@');
      sb.setCharAt(i-1,'@');
      sb.setCharAt(i-2, '@');
      textBoard.setText(sb.toString());

    } // for

    while (true) {
      for (int i = 0; i < WIDTH * HEIGHT; i++) {
        sb.setCharAt(i, ' ');
      }
      
      sb.setCharAt(location, '@');
      textBoard.setText(sb.toString());
     
    }
  } // run

  /**
   * TODO Method description
   *
   */
  public void moveRight() {
    location++;

    if (location > WIDTH * HEIGHT) {
      location = WIDTH * HEIGHT;
    }
  }

  /**
   * TODO Method description
   *
   */
  public void moveLeft() {
    location--;

    if (location < 0) {
      location = 0;
    }
  }
}