第一种：传统的方法
public abstract class TrfficLight {
private int time;
public final static TrfficLight RED = new TrfficLight(30) {
  @Override
  public TrfficLight nextLight() {
   return GREEN;
  }
};
public final static TrfficLight YELLOW = new TrfficLight(5) {
  @Override
  public TrfficLight nextLight() {
   return RED;
  }
};
public final static TrfficLight GREEN = new TrfficLight(45) {
  @Override
  public TrfficLight nextLight() {
   return YELLOW;
  }
};
public abstract TrfficLight nextLight();
public TrfficLight(int time) {
  this.time = time;
}
public int getTime() {
  return time;
}

@Override
public String toString() {
  if (this==RED){
   return "GREEN";
  }else if(this==YELLOW){
   return "RED";
  }else{
   return "YELLOW";
  }
}
}
第二种：枚举的方法
public enum TrifficLinghtEnum {
RED(30){
  @Override
  public String nextLight() {
   return "GREEN";
  }
},
YELLOW(5){
  @Override
  public String nextLight() {
   return "RED";
  }
},
GREEM(45){
  @Override
  public String nextLight() {
   return "YELLOW";
  }
};
public abstract String nextLight();
private int time;
private TrifficLinghtEnum(int time) {
  this.time=time;
}
public int getTime() {
  return time;
}
}
现在我们定义一个类来测试以下，结果是不是一样的呢？
public class TrfficTest {
public static void main(String[] args) {
  /*
   * 传统的方法
   */
  TrfficLight t1=TrfficLight.GREEN;
  System.out.println(t1.nextLight()+"->wait:"+t1.getTime());
  TrfficLight t2=TrfficLight.RED;
  System.out.println(t2.nextLight()+"->wait:"+t2.getTime());
  TrfficLight t3=TrfficLight.YELLOW;
  System.out.println(t3.nextLight()+"->wait:"+t3.getTime());
  
  System.out.println("----------华丽的分割线-------------");
  /*
   * ，枚举的方法
   */
  TrifficLinghtEnum tle1=TrifficLinghtEnum.GREEM;
  System.out.println(tle1.nextLight()+"->wait:"+tle1.getTime());
  TrifficLinghtEnum tle2=TrifficLinghtEnum.RED;
  System.out.println(tle2.nextLight()+"->wait:"+tle2.getTime());
  TrifficLinghtEnum tle3=TrifficLinghtEnum.YELLOW;
  System.out.println(tle3.nextLight()+"->wait"+tle3.getTime());
}
}
打印结果为：

这么牛逼的贴没人坐板凳。

我来顶一下……