Java中有許多設計模式，本片文章通過一個簡化的裝飾模式的程式碼，實現一個簡單的裝飾模式。

package com.java;

public interface Component
{
	public void doSomething();
}

package com.java;

public class ConcreteComponent implements Component
{

	@Override
	public void doSomething()
	{
		System.out.println("funcation A");
	}

}

package com.java;

public class Decorator implements Component
{

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

}
 

package com.java;

public class ConcreteDecorator extends Decorator
{

	public ConcreteDecorator(Component component)
	{
		super(component);
	}

	@Override
	public void doSomething()
	{
		super.doSomething();
		
		this.doAnotherThing();
	}
	
	public void doAnotherThing()
	{
		System.out.println("funcation B");
	}
}
 

package com.java;

public class ConcreteDecorator1 extends Decorator
{

	public ConcreteDecorator1(Component component)
	{
		super(component);
	}
	
	@Override
	public void doSomething()
	{
		super.doSomething();
		this.doAnotherThing();
	}
	
	public void doAnotherThing()
	{
		System.out.println("funcation C");
	}

}
 

package com.java;

public class Client
{
	public static void main(String[] args)
	{
		Component con = new ConcreteComponent();
		
		Component con1 = new ConcreteDecorator(con);
		
		Component con2 = new ConcreteDecorator1(con1);
		
		con2.doSomething();
	}
}

funcation A
funcation B
funcation C