listing29.1.java

java 完全探索的随书源码

import java.awt.*;
import java.beans.*;
public class TextDisplayer extends Canvas implements PropertyChangeListener {
   // default constructor for this Bean.  This is the constructor that an
   // application builder (such as Visual Basic) would use.
   public TextDisplayer() {
      this( "TextDisplayer", Color.white,
            new Font( "Courier", Font.PLAIN, 12 ),
            Color.black );
   }

   // custom constructor for this Bean. This is the constructor you would
   // likely use if you were going to do all your coding from scratch.
   public TextDisplayer( String OutputText, Color BGColor, Font TextFont,
                         Color FontColor ) {
      this.OutputText = OutputText;
      this.BGColor = BGColor;
      this.TextFont = TextFont;
      this.FontColor = FontColor;

      setFont( TextFont );        // set the Canvas's font.
      setBackground( BGColor );   // set the Canvas's background color.
      setForeground( FontColor ); // set the Canvas's foreground color.
   }

   // this Bean's properties.
   protected String OutputText;
   protected Color BGColor, FontColor;
   protected Font TextFont;

   // override the Canvas's paint method to display the text
   public void paint( Graphics g ) {
     // simplistic implementation to display a string
     g.drawString( OutputText, 10, 20 );
   }

   // implement the PropertyChangeListener interface
   public void propertyChange( PropertyChangeEvent evt ) {
     // add code here to respond to a change in a bound property
   }
}