设计模式学习笔记

Java设计模式之装饰者模式

内容主要来自大话设计模式一书，根据看书、查阅其他文章和自己理解来记录装饰着模式这一设计模式

代码示例

未使用装饰着模式的代码

//服饰抽象类
public abstract class Finery {
	public abstract void show();
}
/**
各种服饰子类
*/
//大T恤
class TShirts extends Finery {

	@Override
	public void show() {
		System.out.println("大T恤");
	}
}
// 垮裤
class BigTrouser extends Finery {

	@Override
	public void show() {
		System.out.println("垮裤");
	}
}
// ......
class Sneakers extends Finery {

	@Override
	public void show() {
		System.out.println("破球鞋");
	}
}
class Suit extends Finery {

	@Override
	public void show() {
		System.out.println("西装");
	}
}
class Tie extends Finery {

	@Override
	public void show() {
		System.out.println("领带");
	}
}
class LeatherShoes extends Finery {

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

/**
客户端代码
*/
public static void main(String[] args) {
		Person p = new Person("小明");
		System.out.println("\n第一种装扮;");
		Finery dtx = new TShirts();
		Finery kk = new BigTrouser();
		Finery pqx = new Sneakers();
		
		dtx.show();
		kk.show();
		pqx.show();
		p.show();
		
		System.out.println("\n第二种装扮");
		Finery xz =new Suit();
		Finery ld = new Tie();
		Finery px = new LeatherShoes();
		xz.show();
		ld.show();
		px.show();
		p.show();
	}

使用装饰模式的代码

//Person类
public class Person {

	private String name;

	public Person() {
	}

	public Person(String name) {
		this.name = name;
	}

	public void show() {
		System.out.println("装扮的" + name);
	}
}

//服饰类
public class Finery extends Person {
	protected Person component;

	// 打扮
	public void decorate(Person component) {
		this.component = component;
	}

	@Override
	public void show() {
		if (component != null) {
			component.show();
		}
	}
}

具体服饰类同上

执行结果：