java实现装饰模式

组件接口

package sample.decorator;

abstract public interface IComponent {
	abstract public void doSomething();
}

源头组件

package sample.decorator;

public class Source implements IComponent {

	@Override
	public void doSomething() {
		System.out.println("<<<<<< print Ticker");
	}

}

 

抽象装饰类

package sample.decorator;

abstract public class abstractDecorator implements IComponent {
	private IComponent last;

	public abstractDecorator(IComponent myComponent) {
		super();
		this.last = myComponent;
	}

	public void callLast() {
		if (last != null) {
			last.doSomething();
		}
	}
}

 

具体装饰类1-4

package sample.decorator;

public class Decorator1 extends abstractDecorator {

	public Decorator1(IComponent myComponent) {
		super(myComponent);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void doSomething() {
		System.out.println("<<<<<< Decorator1");
		super.callLast();
	}

}

package sample.decorator;

public class Decorator2 extends abstractDecorator {

	public Decorator2(IComponent myComponent) {
		super(myComponent);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void doSomething() {
		System.out.println("<<<<<< Decorator2");
		super.callLast();
	}

}

 

package sample.decorator;

public class Decorator3 extends abstractDecorator {

	public Decorator3(IComponent myComponent) {
		super(myComponent);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void doSomething() {
		System.out.println("<<<<<< Decorator3");
		super.callLast();
	}

}

 

package sample.decorator;

public class Decorator4 extends abstractDecorator {

	public Decorator4(IComponent myComponent) {
		super(myComponent);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void doSomething() {
		System.out.println("<<<<<< Decorator4");
		super.callLast();
	}

}

 工厂类 

package sample.decorator;

public class Factory {

	public IComponent getComponent() {
		IComponent myComponent;
		myComponent = new Source();
		myComponent = new Decorator1(myComponent);
		myComponent = new Decorator2(myComponent);
		myComponent = new Decorator3(myComponent);
		myComponent = new Decorator4(myComponent);
		return myComponent;
	}

}

 

主函数

package sample.decorator;

public class Client {
	public static void main(String[] args) {
		Factory myFactory = new Factory();
		IComponent myComponent = myFactory.getComponent();
		myComponent.doSomething();
	}
}

 附件是项目代码