代理模式6

Posted 2022-09-04 zzlcome

隐藏真实访问对象，对外代理对象

 

package structural;

public class ProxyMain 

    public static void main(String[] args) 
        ProxySubject proxy = new ProxySubject();
        proxy.getRequest();
    



interface Subject
    void getRequest();


class RealSubject implements Subject

    @Override
    public void getRequest() 
        System.out.println("你访问到真的我了！");
    
    


class ProxySubject implements Subject

    private RealSubject realSubject;
    @Override
    public void getRequest() 
        
        if(realSubject == null)
            realSubject = new RealSubject();
        
        
        preRequest();
        realSubject.getRequest();
        endRequest();
        
    
    private void preRequest() 
        System.out.println("处理前！");
    
    private void endRequest() 
        System.out.println("处理后！");