remotectrtest.java

来自「Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想」· Java 代码 · 共 32 行

package chapter7.remotecontrol;
import java.util.Random;
public  class RemoteCtrTest 
{
	public static void main(String[] args) 
	{
		try 
		{
			IRemoteCtrl rCtrl = null;
			Random random = new Random();
			Object[] obj={ new TV("厦华"),new DVD("万利达")};//设置一组家电
		    for(int i=0;i<2;i++)
		    {
		    	 rCtrl = (IRemoteCtrl) obj[random.nextInt(2)]; //对象强制类型转换
		         rCtrl.powerOnOff();
		         rCtrl.setChannel(200);
		         rCtrl.channelDown();
		         rCtrl.mute();
		         rCtrl.volumeDown(90);
		         if(obj[1] instanceof IRemoteCtrl)
		         {
		        	 System.out.println("yes");
		         }
		    }
		}
		catch(Exception ex) //异常捕捉
		{
			System.out.println("程序异常！");
		}
	}
}