sketchview.java

Java Classic Examples是我买的两本书：《JAVA经典实例》和《java入门经典源代码》里边附送光盘里带的源码

import javax.swing.*;
import java.util.*;                  // For Observer
import java.awt.*;                   // For Graphics

class SketchView extends JComponent
                 implements Observer
{
  public void paint(Graphics g)
  {
    // Temporary code
    Graphics2D g2D = (Graphics2D)g;                 // Get a Java 2D device context

    g2D.setPaint(Color.red);                        // Draw in red
    g2D.draw3DRect(50, 50, 150, 100, true);         // Draw a raised 3D rectangle
    g2D.drawString("A nice 3D rectangle", 60, 100); // Draw some text
  }

  public SketchView(Sketcher theApp)
  {
    this.theApp = theApp;
  }

  // Method called by Observable object when it changes
  public void update(Observable o, Object rectangle)
  {
    // Code to respond to changes in the model...
  }

  private Sketcher theApp;           // The application object
}