静态代理和装饰者模式的区别

package com.zjt.test;

interface Duck {
    void swim();
}

class DuckImpl implements Duck{
    @Override
    public void swim() {
        System.out.println("小鸭子会游泳");
    }
}

class ProxyDuck implements Duck{
    Duck duck;
　　　//一个空的构造函数，且代理类中明确声明需要代理的目标对象
    public ProxyDuck(){
        this.duck=new DuckImpl();
    }

    @Override
    public void swim() {
        System.out.println("噶嘎嘎。。。");
        duck.swim();
    }
}

class Test{
    public static void main(String[] args) {
        Duck duck = new ProxyDuck();
        duck.swim();
    }
}

package com.zjt.test;

public interface Duck {
    void swim();
}
class DuckImpl implements Duck{

    @Override
    public void swim() {
        System.out.println("swim....");
    }
}

class Director implements Duck{
    Duck duck;
    //编译期不知道具体的目标对象，只有运行期调用者手动传入才知道
    public Director(Duck duck){
      this.duck=duck;
    }

    @Override
    public void swim() {
        System.out.println("gagaga.....1");
        duck.swim();
        System.out.println("gagaga.....2");
    }
}


class Test{
    public static void main(String[] args) {
        Duck duck = new Director(new DuckImpl());
        duck.swim();
    }
}