Java day07 多态示例 主板接口

// 多态应用实例  主板（主机）-总线（接口）-扩展卡（实现）
interface Bus
{
	public void open();
	public void close();
}

class MasterBoard
{
	public void run()
	{
		System.out.println("Masterboard is running");
	}
	public void useBus(Bus b)
	{
		if(b!=null)
		{
			b.open();
			b.close();
		}
		else
		{
			System.out.println("NO card use bus");
		}
	}
}
class SoundCard implements Bus
{
	public void open()
	{
		System.out.println("SoundCard is launching");
	}
	public void close()
	{
		System.out.println("SoundCard is closing");
	}
}

class PolymophismDemo2 
{
	public static void main(String[] args) 
	{
		MasterBoard m=new MasterBoard();
		m.run();
		m.useBus(new SoundCard());
	}
}