Java 设计模式之代理模式

直接调用代理类，用代理类访问目标类。

package Pak;

public interface Sourceable {
    public void method();
}

package Pak;

public class Source implements     Sourceable {
    
    @Override
    public void method(){
        System.out.println("the original method!");
        
    }
}

package Pak;

public class Proxy implements Sourceable {
    private Source source;

    public Proxy() {
        super();
        this.source = new Source();
    }

    @Override
    public void method() {
        // TODO Auto-generated method stub
        before();
        source.method();
        after();
    }

    private void after() {
        System.out.println("after proxy!");
    }

    private void before() {
        System.out.println("Before proxy!");
    }
}

package Pak;

import java.util.ArrayList;
import java.util.List;

public class Main {

    public static void main(String[] args) throws Exception {
        Sourceable source = new Proxy();
        source.method();

    }
}