colordemo.java

java 完全探索的随书源码

// ColorDemo.java

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

public class ColorDemo extends Applet
{
   public void paint (Graphics g)
   {
      int w = getSize ().width;
      int h = getSize ().height;

      g.setColor (Color.red);
      g.fillRect (0, 0, w - 1, h - 1);

      g.setColor (Color.black);
      g.fillOval (0, 0, w - 1, h - 1);

      g.setColor (new Color (60, 190, 175));

      FontMetrics fm = g.getFontMetrics ();
      String s = "This text is aquamarine.";
      int x = (w - fm.stringWidth (s)) / 2;
      g.drawString (s, x, h / 2);

      System.out.println ("Red = " + g.getColor ().getRed ());
      System.out.println ("Green = " + g.getColor ().getGreen ());
      System.out.println ("Blue = " + g.getColor ().getBlue ());
      System.out.println ("Alpha = " + g.getColor ().getAlpha ());
   }
}