buttoncanvas.java

Java 入门书的源码

//Copyright (c) 1998, Arthur Gittleman
//This example is provided WITHOUT ANY WARRANTY either expressed or implied.

/* Adds two buttons and a canvas to an applet.
 * Sets size of canvas, which by default is 0x0.
 * Sets background to pink to see it.
 * Overrides paint to draw in canvas.
 */

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

public class ButtonCanvas extends Applet {
  public void init() {
    add(new Button("one"));
    add(new Button("two"));
    DrawOn canvas = new DrawOn();
    add(canvas);
    canvas.setBackground(Color.pink);
    canvas.setSize(150,150);
  }
}
class DrawOn extends Canvas {
  public void paint(Graphics g) {
    g.drawString("Hi there",20,20);
  }
}