设计模式学习系列七：装饰模式（Decorator）

public class TestDecorator {

public static void main(String[] args) {

Teacher t1=new SimpleTeacher();

Teacher t2=new CppTeacher(t1);

Teacher t3=new JavaTeacher(t2);

t3.teach();

//t.teach();

}

}

abstract class Teacher{

public abstract void teach();

}

class SimpleTeacher extends Teacher{

public void teach(){

System.out.println("Good Good Study, Day Day Up");

}

}

class JavaTeacher extends Teacher{

Teacher teacher;

public JavaTeacher(Teacher t){

this.teacher=t;

}

public void teach(){

teacher.teach();

System.out.println("Teach Java");

}

}

class CppTeacher extends Teacher{

Teacher teacher;

public CppTeacher(Teacher t){

this.teacher=t;

}

public void teach(){

teacher.teach();

System.out.println("Teach C++");

}

}