demo.java

这是清华大学编写的JAVA教材中所有题目的源代码！

interface PCI
{
	void start();
	void stop();
}

class DisplayCard implements PCI
{
	public void start()
	{
		System.out.println("Display...");
	}
	public void stop()
	{
		System.out.println("Display Stop");
	}
}

class SoundCard implements PCI
{
	public void start()
	{
		System.out.println("Sound...");
	}
	public void stop()
	{
		System.out.println("Sound Stop");
	}
}

class MainBoard
{
	public void usePCICard(PCI p)
	{
		p.start();
		p.stop();
	};
}

class Assemble
{
	public static void main(String args[])
	{
		MainBoard mb=new MainBoard();
		DisplayCard dc=new DisplayCard();
		SoundCard sc=new SoundCard();
		
		mb.usePCICard(dc);
		mb.usePCICard(sc);
	}
}