java.beans中PropertyChangeSupport使用实例

最新推荐文章于 2020-08-27 15:34:32 发布

最新推荐文章于 2020-08-27 15:34:32 发布 · 953 阅读

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#Java #Bean

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本文介绍了一个简单的Java Bean实现，该Bean包含姓名和性别两个属性，并通过PropertyChangeSupport实现了属性改变时的通知功能。同时，提供了一个监听器示例，用于接收并打印属性变更的详细信息。

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import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;


public class MyBean{
      private String name = "redheart";
      private String sex = "男";
      private PropertyChangeSupport support = new PropertyChangeSupport(this);
      public void setName(String newname){
             String oldname = this.name;
             this.name = newname;
             support.firePropertyChange("name", oldname, newname);
             }
      public String getSex() {
		return sex;
	}
	public void setSex(String newsex){
          String oldsex = this.sex;
          this.sex = newsex;
          support.firePropertyChange("sex", oldsex, newsex);
          }
      public String getName(){
             return name;
      }
      public void addPropertyChangeListener(PropertyChangeListener listener) {
       support.addPropertyChangeListener(listener);
    }
 
    public void removePropertyChangeListener(PropertyChangeListener listener) {
       support.removePropertyChangeListener(listener);
    }
}


import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

public class UseMybean implements PropertyChangeListener
{ 
	private static  MyBean bean = new MyBean();
    public static void main(String [] args)
   { 
    	UseMybean usebean = new UseMybean();
       bean.addPropertyChangeListener(usebean);
       bean.setName("bluesky");
       bean.setSex("女");
       System.out.println("打印我的名字："+bean.getName());
       System.out.println("打印我的姓别："+bean.getSex());
   }
    
   public void propertyChange(PropertyChangeEvent e)
   {
	   
    if (e.getSource() == bean) 
     {
    	  //System.out.println("旧的名字："+e.getPropertyName());
       System.out.println("旧的"+e.getPropertyName()+"："+e.getOldValue().toString());
       System.out.println("新的"+e.getPropertyName()+"："+e.getNewValue().toString());
     }
    }
 
}