debug15_3.java

来自「程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件」· Java 代码 · 共 31 行

package questions.c15;
import javax.swing.JPanel;
import java.awt.*;
import java.beans.*;
public class Debug15_3 extends JPanel {
   private String text = "Default text";
   private static final Point START = new Point( 20, 20 );
   private PropertyChangeSupport listeners
      = new PropertyChangeSupport( this );
   public void setDrawText( String text ) {
      this.text = text;
   }
   public String getDrawText() {
      return text;
   }
   public Dimension getPreferredSize() {
      return new Dimension( 100, 40 );
   }
   public void paintComponent( Graphics g ) {
      super.paintComponent( g );
      g.drawString( text, START.x, START.y );
   }
   public void addPropertyChangeListener(
               PropertyChangeListener l ) {
      listeners.addPropertyChangeListener( l );
   }
   public void removePropertyChangeListener(
               PropertyChangeListener l ) {
      listeners.removePropertyChangeListener( l );
   }
}