package javabeans;import java.awt.*;import javax.swing.JPanel;import javax.swing.BorderFactory;import javax.swing.border.*;import java.beans.*;public class BeanieBaby extends JPanel {  BorderLayout borderLayout1 = new BorderLayout();  private String allTiedup;	// allTiedUp屬性字段  private transient PropertyChangeSupport propertyChangeListeners = new PropertyChangeSupport(this);	// PropertyChangeSupport實例，用于消息處理  public BeanieBaby() {    try {      jbInit();    }    catch(Exception ex) {      ex.printStackTrace();    }  }  private void jbInit() throws Exception {    this.setBackground(Color.red);    this.setBorder(BorderFactory.createRaisedBevelBorder());    this.setLayout(borderLayout1);  }  public void setAllTiedup(String allTiedup) {	// allTiedUp寫方法     String  oldAllTiedup = this.allTiedup;     this.allTiedup = allTiedup;     // 利用PropertyChangeSupport通知監聽器屬性值變了！     propertyChangeListeners.firePropertyChange("allTiedup", oldAllTiedup, allTiedup);   }   // 事件監聽器的注銷方法   public synchronized void removePropertyChangeListener(PropertyChangeListener l) {     super.removePropertyChangeListener(l);     propertyChangeListeners.removePropertyChangeListener(l);   }   // 事件監聽器的注冊方法   public synchronized void addPropertyChangeListener(PropertyChangeListener l) {     super.addPropertyChangeListener(l);     propertyChangeListeners.addPropertyChangeListener(l);   }}