java核心技术简单例子

来源：互联网发布：asp与php哪个好学编辑：程序博客网时间：2024/05/18 11:27

import java.awt.BorderLayout;

import javax.swing.JFrame;

public class EventSourceTest {

/**
* @param args
*/
public static void main(String[] args) {
  EventSourceFrame frame = new EventSourceFrame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setVisible(true);
}

}

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JFrame;

class EventSourceFrame extends JFrame {
public static final int DEFAULT_WITH = 400;
public static final int DEFAULT_HEIGHT = 200;

  public EventSourceFrame() {
   setTitle("EventSourceTest");
   setSize(DEFAULT_WITH, DEFAULT_HEIGHT);

   final PaintCountPanel panel = new PaintCountPanel();
   add(panel);

   panel.addPropertyChangeListener(new
     PropertyChangeListener()
   {
   public void propertyChange(PropertyChangeEvent event){
    setTitle("java核心技术简单例子"+event.getNewValue());
   }
   });

}
}

import java.awt.Graphics;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.EventListener;

import javax.swing.JPanel;

class PaintCountPanel extends JPanel {
  public void paintComponent(Graphics g) {
   int oldPaintCount = paintCount;
   paintCount++;
   firePropertyChangeEvent(new PropertyChangeEvent(this, "paintCount",oldPaintCount,
     paintCount));
  }
public void addPropertyChangeListener(PropertyChangeListener listener) {
  listenerList.add(PropertyChangeListener.class, listener);
}

public void removePropertyChangeListener(PropertyChangeListener listener) {
listenerList.remove(PropertyChangeListener.class, listener);
}

public void firePropertyChangeEvent(PropertyChangeEvent event) {
  EventListener[] listeners = listenerList
    .getListeners(PropertyChangeListener.class);
  for (EventListener l : listeners)
   ((PropertyChangeListener)l).propertyChange(event);
}

public int getPaintCoutn() {
return paintCount;
}

private int paintCount;
}