java设计模式—静态代理模式(聚合与继承方式对比)

 public interface Movable {
  public void move();
 }

import java.util.Random;

public class Tank implements Movable {

 @Override
 public void move() {
  System.out.println("Tank moving.......");
  try {
   Thread.sleep(new Random().nextInt(5000));
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
 }

}

public class TankTimeProxy implements Movable {

 Movable m;
 
 public TankTimeProxy(Movable m) {
  this.m = m;
 }

 @Override
 public void move() {
  System.out.println("Time Proxy start...........");
  long start = System.currentTimeMillis();
  m.move();
  long end = System.currentTimeMillis();
  System.out.println("花费时间："+(end - start));
  System.out.println("Time Proxy end...........");
 }

}

public class TankLogProxy implements Movable {

 Movable m;
 
 public TankLogProxy(Movable m) {
  this.m = m;
 }

 @Override
 public void move() {
  System.out.println("Log Proxy start...........");
  m.move();
  System.out.println("Log Proxy end...........");
 }

}

public class Tank2Time extends Tank {

 public void move(){
  System.out.println("Tank2 time start...........");
  long start = System.currentTimeMillis();
  super.move();
  long end = System.currentTimeMillis();
  System.out.println("花费时间："+(end - start));
  System.out.println("Tank2 time end...........");
 }
}

public class Tank3Log extends Tank2Time {

 public void move(){
  System.out.println("Tank3Log start...........");
  super.move();
  System.out.println("Tank3Log end...........");
 }
}

public class Client {

 @Test
 public void testProxy(){
  
  Tank t = new Tank();
  Movable m;
  
  //一、聚合的方式(较灵活，因为实现了接口)
  //1.1聚合方式的代理,先日志代理，后时间代理
  TankTimeProxy ttp1 = new TankTimeProxy(t);
  TankLogProxy tlp1 = new TankLogProxy(ttp1);
  
  m = tlp1;
  m.move();
  
  System.out.println("\n==============================分隔线==========================\n");
  
  //1.2聚合方式的代理,先时间代理，后日志代理(可以灵活切换顺序)
  TankLogProxy tlp2 = new TankLogProxy(t);
  TankTimeProxy ttp2 = new TankTimeProxy(tlp2);
  
  m = ttp2;
  m.move();
  
  System.out.println("\n==============================分隔线==========================\n");
  
  //二、继承的方式
  //2.1代理时间
  Tank2Time t2 = new Tank2Time();
  t2.move();
  
  System.out.println("\n==============================分隔线==========================\n");
  
  //2.2先代理日志，后时间，不能灵活切换
  Tank3Log t3 = new Tank3Log();
  t3.move(); 
 }
}