drawwithcanvas.java

Java程序设计技巧与开发实例附书源代码。

import java.applet.*;
import java.awt.*;

public class DrawWithCanvas
    extends Applet {
  private Button draw = new Button("Draw");
  private DrawCanvas drawing = new DrawCanvas();
  public void init() {
    Panel buttons = new Panel();
    buttons.setLayout(new FlowLayout());
    buttons.add(draw);
    setLayout(new BorderLayout());
    add("North", buttons);
    add("Center", drawing);
  }
}

class DrawCanvas
    extends Canvas {
  public void paint(Graphics g) {
    for (int i = 12; i < getSize().height; i += 12) {
      g.drawString("y location: " + i, 10, i);
    }
  }
}