ProxyTest.java

package JavaPatternDemos;


/**
 * 代理 和 装饰器
 * 代理: 一般只是该对象，同时可能会新增功能
 * 装饰器：一般是接口实现，只是对接口的方法进行拓展
 *
 */
public class ProxyTest {
 public static void main(String[] args) {

 AppleProduct apple_1 = new AppleProduct();
 AppleProxy oneProxy = new AppleProxy(apple_1);
 oneProxy.eat();
 oneProxy.cook();

 AppleProduct apple_2 = new AppleProduct();
 MyProduct oneDecorator = new ProductDecoratorClean(new ProductDecoratorLogger(apple_2));
 oneDecorator.eat();
 }
}



interface MyProduct {
 void eat();
}

class AppleProduct implements MyProduct {
 @Override
 public void eat() {
 System.out.println("eat apple");
 }
}



class AppleProxy implements MyProduct {
 private AppleProduct prod;

 public AppleProxy(AppleProduct mApple){
 prod = mApple;
 }

 @Override
 public void eat() {
 System.out.println("this is a poxy");
 prod.eat();
 }

 // 还可以有新的功能
 public void cook(){
 System.out.println("cooking apple");
 }

}



// -----------------------------------
// 下面是装饰器
// -----------------------------------

class ProductDecoratorLogger implements MyProduct {
 private MyProduct aProd;

 public ProductDecoratorLogger(MyProduct mProduct){
 aProd = mProduct;
 }

 @Override
 public void eat() {
 System.out.println("log: eating apple");
 aProd.eat();
 }
}

class ProductDecoratorClean implements MyProduct {
 private MyProduct aProd;

 public ProductDecoratorClean(MyProduct mProduct){
 aProd = mProduct;
 }

 @Override
 public void eat() {
 System.out.println("clean before eating");
 aProd.eat();
 }
}