trafficlight.java

用NETBEANS做的一个关于Java的小小的demo.大家赐教

/*
 * TrafficLight.java
 *
 * Created on 2007年9月12日, 下午9:19
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package javaapplication1;

/**
 *
 * @author Administrator
 */
public enum TrafficLight {
    
    RED(30){
        public TrafficLight next(){return GREEN;}
    },
    AMBER(10){
        public TrafficLight next(){return RED;}
    },
    GREEN(40){
        public TrafficLight next(){return AMBER;}
    };
    private final int duration;
    /** Creates a new instance of TrafficLight */
    TrafficLight(int duration) {
        this.duration = duration;
    }
    
    public int getDuration(){
        return this.duration;
    }
    
    public abstract TrafficLight next();
    
}