welcome to dmoon'blog+.(暗月)

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http://25463204.blogbus.com/logs/28331177.html

abstract class Door {
abstract void door(String key);     //抽象方法door
}
interface Alarm {          //接口Alarm
void alarm();
}
class AlarmDoor extends Door implements Alarm { //实现接口
static String keyon = "open";
static String keyoff = "close";
void door(String key) {        //重写抽象方法door
   System.out.println("The Door is " + key + ", now.");
}            
public void alarm() {        //实现接口的方法
   System.out.println("Alarm!!!");    
}
public static void main(String[] args) {
   AlarmDoor xx = new AlarmDoor();    
   xx.door(keyon);        
   xx.door(keyoff);       
   xx.alarm();         
}
}