java中的枚举

最新推荐文章于 2025-12-02 21:20:38 发布

最新推荐文章于 2025-12-02 21:20:38 发布 · 52 阅读

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#java

本文通过两个具体的例子展示了Java中枚举类型的使用方法。第一个例子创建了一个表示星期的枚举类型，并演示了如何调用其成员变量及方法；第二个例子定义了一个交通信号灯的枚举类型，展示了如何在枚举中实现抽象方法。

import java.util.Date;

public class EnumTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
WeekDay1 weekDay = WeekDay1.MON;
System.out.println(weekDay.nextDay());

WeekDay weekDay2 = WeekDay.FRI;
System.out.println(weekDay2);
System.out.println(weekDay2.name());
System.out.println(weekDay2.ordinal());
System.out.println(WeekDay.valueOf("SUN").toString());
System.out.println(WeekDay.values().length);

new Date(300){};
}

public enum WeekDay{

SUN(1),MON(),TUE,WED,THI,FRI,SAT;
private WeekDay(){System.out.println("first");}
private WeekDay(int day){System.out.println("second");}
}

public enum TrafficLamp{
RED(30){
public TrafficLamp nextLamp(){
return GREEN;
}
},
GREEN(45){
public TrafficLamp nextLamp(){
return YELLOW;
}
},
YELLOW(5){
public TrafficLamp nextLamp(){
return RED;
}
};
public abstract TrafficLamp nextLamp();
private int time;
private TrafficLamp(int time){this.time = time;}
}
}