装饰模式例子

最新推荐文章于 2023-03-23 09:07:21 发布

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最新推荐文章于 2023-03-23 09:07:21 发布

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分类专栏：设计模式

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本文介绍了Java中装饰器模式的应用实例，通过实现组件接口和装饰接口，展示如何动态地扩展对象的功能。具体展示了如何创建具体组件类和装饰类，并通过组合实现功能扩展。

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package io;

public interface Component
{
public void doSomething();
}

package io;


public class ConcreteComponent implements Component
{
@Override
public void doSomething()
{
System.out.println("功能A");
}


}

package io;
public class Decorator implements Component
{
	private Component component;
	
	public Decorator(Component component)
	{
		this.component = component;
	}
	
	@Override
	public void doSomething()
	{
		component.doSomething();
	}
}

package io;

public class ConcreteDecorator1 extends Decorator
{
	public ConcreteDecorator1(Component component)
	{
		super(component);
	}
	
	@Override
	public void doSomething()
	{
		super.doSomething();
		
		this.doAnotherThing();
	}
	
	private void doAnotherThing()
	{
		System.out.println("功能B");
	}

}

package io;


public class ConcreteDecorator2 extends Decorator
{
public ConcreteDecorator2(Component component)
{
super(component);
}

@Override
public void doSomething()
{
super.doSomething();

this.doAnotherThing();
}

private void doAnotherThing()
{
System.out.println("功能C");
}
}

package io;


public class Client
{
public static void main(String[] args)
{
/*
* //节点流 Component component = new ConcreteComponent();
* 
* //过滤流 Component component2 = new ConcreteDecorator1(component);
* 
* component2.doSomething();
* 
* System.out.println("------------");
* 
* //过滤流 Component component3 = new ConcreteDecorator2(component2);
* 
* component3.doSomething();
*/


Component component = new ConcreteDecorator1(new ConcreteDecorator2(
new ConcreteComponent()));


component.doSomething();
}
}