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，通知所有相关的监听器。

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()); 
       
    } 
  } 
} 

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