package demo;
import Java.util.EventObject;
/**
* Title: 事件處理類(lèi)，繼承了事件基類(lèi)
* Description: 
* Copyright: Copyright (c) 2005
* Company: cuijiang
* @author not attributable
* @version 1.0
*/
public class DemoEvent extends EventObject
{
  private Object obj;
  private String sName;
  public DemoEvent(Object source,String sName)  {
   super(source);
   obj = source;
   this.sName=sName;
  }
  public Object getSource()
  {
   return obj;
  }
  public void say()
  {
   System.out.println("這個(gè)是 say 方法...");
  }
  public String getName()
  {
   return sName;
  }
}

package demo;
import java.util.EventListener;
/**
* Title: 監(jiān)聽(tīng)器接口
* Description: 
* Copyright: Copyright (c) 2005
* Company: cuijiang
* @author not attributable
* @version 1.0
*/
public interface DemoListener extends EventListener{
  public void demoEvent(DemoEvent dm);
}
 

package demo;
import java.util.*;
/**
* Title: 使用事件的類(lèi)
* Description: 該類(lèi)實(shí)現(xiàn)了監(jiān)聽(tīng)器的添加和監(jiān)聽(tīng)器方法的執(zhí)行，并且實(shí)現(xiàn)了由于屬性的改變而執(zhí)行事件
* Description: 在添加、刪除、執(zhí)行監(jiān)聽(tīng)器的時(shí)候都要注意同步問(wèn)題
* Copyright: Copyright (c) 2005
* Company: cuijiang
* @author not attributable
* @version 1.0
*/
public class DemoSource{
  private Vector repository = new Vector();
  private DemoListener dl;
  private String sName="";
  public DemoSource()
  {
  }
  //注冊(cè)監(jiān)聽(tīng)器，如果這里沒(méi)有使用Vector而是使用ArrayList那么要注意同步問(wèn)題
  public void addDemoListener(DemoListener dl)
  {
   repository.addElement(dl);//這步要注意同步問(wèn)題
  }
  //如果這里沒(méi)有使用Vector而是使用ArrayList那么要注意同步問(wèn)題
  public void notifyDemoEvent(DemoEvent event) {
   Enumeration enum = repository.elements();//這步要注意同步問(wèn)題
   while(enum.hasMoreElements())
   {
    dl = (DemoListener)enum.nextElement();
    dl.demoEvent(event);
   }
  }
  //刪除監(jiān)聽(tīng)器，如果這里沒(méi)有使用Vector而是使用ArrayList那么要注意同步問(wèn)題
  public void removeDemoListener(DemoListener dl)
  {
   repository.remove(dl);//這步要注意同步問(wèn)題
  }
  /**
  * 設(shè)置屬性
  * @param str1 String
  */
  public void setName(String str1)
  {
   boolean bool=false;
   if(str1==null && sName!=null) bool=true;
   else if(str1!=null && sName==null) bool=true;
   else if(!sName.equals(str1)) bool=true;
   this.sName=str1;
   //如果改變則執(zhí)行事件
   if(bool) notifyDemoEvent(new DemoEvent(this,sName));
  }
  public String getName()
  {
   return sName;
  }
}
 

package demo;
import java.lang.Thread;
/**
* Title: 測(cè)試類(lèi)
* Description: 測(cè)試了由于改變屬性而引起的事件發(fā)生
* Copyright: Copyright (c) 2005
* Company: cuijiang
* @author not attributable
* @version 1.0
*/
public class TestDemo
   implements DemoListener {
  private DemoSource ds;
  public TestDemo()
  {
   ds=new DemoSource();
   ds.addDemoListener(this);
   System.out.println("添加監(jiān)聽(tīng)器完畢");
   try {
    Thread.sleep(3000);
    //改變屬性,觸發(fā)事件
    ds.setName("改變屬性,觸發(fā)事件");
   }
   catch (InterruptedException ex) {
    ex.printStackTrace();
   }
   ds.addDemoListener(this);
   System.out.println("添加監(jiān)聽(tīng)器完畢2");
   try {
    Thread.sleep(3000);
    //改變屬性,觸發(fā)事件
    ds.setName("改變屬性,觸發(fā)事件2");
   }
   catch (InterruptedException ex) {
    ex.printStackTrace();
   }
   ds.removeDemoListener(this);
   System.out.println("添加監(jiān)聽(tīng)器完畢3");
   try {
    Thread.sleep(3000);
    //改變屬性,觸發(fā)事件
    ds.setName("改變屬性,觸發(fā)事件3");
   }
   catch (InterruptedException ex) {
    ex.printStackTrace();
   }

  }
  public static void main(String args[])
  {
   new TestDemo();
  }
  /**
  * demoEvent
  *
  * @param dm DemoEvent
  * @todo Implement this test.DemoListener method
  */
  public void demoEvent(DemoEvent dm) {
   System.out.println("事件處理方法");
   System.out.println(dm.getName());
   dm.say();
  }
}