设计模式学习----装饰模式

类型：结构模式

 

动态的对一个对象进行功能上的扩展，也可以对其子类进行功能上的扩展。

 

uml图

 

package car_package;
public abstract class car_parent {
    // 汽车抽象父类
    private String make_address;
    private int speed;
    public String getMake_address() {
        return make_address;
    }
    public void setMake_address(String make_address) {
        this.make_address = make_address;
    }
    public int getSpeed() {
        return speed;
    }
    public void setSpeed(int speed) {
        this.speed = speed;
    }
    public abstract void print_face();
}

 

 

然后新建一个奥迪汽车子类

 

package car_package;
public class audi_sub extends car_parent {
    // 奥迪汽车子类
    @Override
    public void print_face() {
        System.out.println("audi车默认的颜色为　黑色");
    }
}

 

然后再新建一个装饰者父类：

 

package decorator_package;
import car_package.car_parent;
public abstract class decorator_parent extends car_parent {
    // 装饰者父类
    protected car_parent car_parent_ref;
    public void setCar_parent_ref(car_parent car_parent_ref) {
        this.car_parent_ref = car_parent_ref;
    }
    @Override
    public void print_face() {
        car_parent_ref.print_face();
    }
}

 

然后再新建装饰者子类：红色火焰装饰者类：

 

package decorator_package;
public class decorator_audi_red extends decorator_parent {
    @Override
    public void print_face() {
        super.print_face();
        System.out.println("给　奥迪　喷涂鸦　-　颜色为　红色火焰");
    }
}

 

然后再新建装饰者子类：紫色霞光装饰者类：

 

package decorator_package;
public class decorator_audi_purple extends decorator_parent {
    @Override
    public void print_face() {
        super.print_face();
        System.out.println("给　奥迪　喷涂鸦　-　颜色为　紫色霞光");
    }
}

 

新建一个运行类

 

package main_run;

import car_package.audi_sub;
import decorator_package.decorator_audi_purple;
import decorator_package.decorator_audi_red;

public class main_run {

    public static void main(String[] args) {

        audi_sub audi_sub_ref = new audi_sub();
        audi_sub_ref.setMake_address("北京市朝阳区");
        audi_sub_ref.setSpeed(200);

        decorator_audi_red decorator_audi_red_ref = new decorator_audi_red();
        decorator_audi_red_ref.setCar_parent_ref(audi_sub_ref);

        decorator_audi_purple decorator_audi_purple_ref = new decorator_audi_purple();
        decorator_audi_purple_ref.setCar_parent_ref(decorator_audi_red_ref);

        decorator_audi_purple_ref.print_face();
    }
}

 

package decorator;
public interface Component{
    public void setName(String aName);
    public String getName();
}

 

ConcreteComponent代码：

package decorator;
public class ConcreteComponent implements Component{
    String name;
    public void setName(String aName){
       name = aName;
    }
    public String getName(){
       return name;
    }
}

 

Decorator代码：

package decorator;
public class Decorator implements Component{
    private Component component;
    public Decorator(Component c){
       component = c;
    }
    public void setName(String aName){
       component.setName(aName);
    }
    public String getName(){
       return "Name :"+component.getName();
    }
}

 

Client代码

package decorator;
public class Client {
    public static void main(String[] args){
       Component c= new ConcreteComponent();
        Component d = new Decorator(c);
       c.setName("Lili");
       System.out.println(c.getName());
       d.setName("Lili");
       System.out.println(d.getName());
    }
}