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abstract public class Subject{
abstract public void request();
}
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public class RealSubject extends Subject{
public RealSubject(){
}
public void request(){
System.out.println("from real subject.");
}
}
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public class ProxySubject extends Subject{
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·¨
postRequest();
}
private void preRequest(){
//something you want to do before requesting
}
private void postRequest(){
//something you want to do after requesting
}
}
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Subject sub=new ProxySubject();
Sub.request();
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import java.awt.Font;
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