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1.ʾÀý
Ö÷ҪʵÏÖ´úÂë,·Ö 4 ²½:
µÚÒ»²½ ³éÏó½ÇÉ«:
Subject.java
abstract public class Subject{ abstract public void request();}
µÚ¶þ²½´úÀí½ÇÉ«:
ProxySubject.java
public class ProxySubject{
 private RealSubject realSubject;  //ÒÔÕæÊµ½ÇÉ«×÷Ϊ´úÀí½ÇÉ«µÄÊôÐÔ
 public ProxySubject(){}
    public void request(){  //¸Ã·½·¨·â×°ÁËÕæÊµ¶ÔÏóµÄrequest·½·¨
 preRequest();
 if(realSubject == null)
 {
      realSubject = new RealSubject();
 }
 realSubject.request();   //´Ë´¦Ö´ÐÐÕæÊµ¶ÔÏóµÄrequest·½·¨,Õâ¾äÌåÏÖÁË´úÀí˼Ïë
 postRequest();
 }
 private void preRequest(){
    System.out.println("hello");
}
 private void postRequest(){
    System.out.println("world");
}
   }
µÚÈý²½ ÕæÊµ½ÇÉ«
RealSubject.java
public class RealSubject{
        public RealSubject(){}
 public void request(){
   System.out.println("from real request");
      }
}
µÚËIJ½ ¿Í»§¶Ëµ÷ÓÃ:
Client.java
public class Client{
 public static void main(String[] args){
    Subject sub = new ProxySubject();
    sub.


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