详解java中的PropertyChangeSupport与PropertyChangeListener

详解java中的PropertyChangeSupport与PropertyChangeListener

java中的PropertyChangeSupport与PropertyChangeListener配合使用能够实现，绑定属性会在属性值发生变化时，通知所有相关的 * 。

javaBean：

package com.wang.test.property;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
public class TestBean {
protected final PropertyChangeSupport support = new PropertyChangeSupport(this);
private String str;
public String getStr() {
   return str;
 }
public void setStr(String str) {
   support.firePropertyChange("str", this.str, str);
   this.str = str;
 }
public void addPropertyChangeListener(PropertyChangeListener listener) {
   support.addPropertyChangeListener(listener);
 }
public void removePropertyChangeListener(PropertyChangeListener listener) {
   support.removePropertyChangeListener(listener);
 }
}

 client：

package com.wang.test.property;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
public class PropertyChangeSupportTest {
public static void main(String[] args) {  
TestBean test = new TestBean();
   test.setStr("ddddd");
   test.addPropertyChangeListener(new PropertyChangeListener1());
   test.setStr("yyyy");
//test.addPropertyChangeListener(new PropertyChangeListener2());
   //test.setStr("hhhhhhf");
 }  
public static class PropertyChangeListener1 implements PropertyChangeListener{
@Override
   public void propertyChange(PropertyChangeEvent evt) {
     System.out.println( "1: " + evt.getPropertyName() + "  " + evt.getNewValue() + "  " + evt.getOldValue());
}
 }
public static class PropertyChangeListener2 implements PropertyChangeListener{
@Override
   public void propertyChange(PropertyChangeEvent evt) {
     System.out.println( "2: " + evt.getPropertyName() + "  " + evt.getNewValue() + "  " + evt.getOldValue());
}
 }
}

来源：http://hejiawangjava.iteye.com/blog/2391916