import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

/* <applet code="KeyTest.class" width="150" height="150"> </applet> */

public class KeyTest extends JApplet implements KeyListener {
  int x=50, y=20;

  @Override
  public void init() {
    addKeyListener(this);
  }

  @Override
  public void paint(Graphics g) {
    super.paint(g);
    g.drawString("HELLO WORLD!", x, y);
    // requestFocus(); // これがないとうまく動かない事があるので念のため。
  }

  public void keyPressed(KeyEvent e) {
    int k = e.getKeyCode();
    if (k=='u' || k=='U') {
      y-=10;
    } else if (k=='d' || k=='D') {
      y+=10;
    } 
    repaint();
  }
  public void keyReleased(KeyEvent e) {}
  public void keyTyped(KeyEvent e) {}
}