枚举

来源：互联网发布：刘飞儿送一血知乎编辑：程序博客网时间：2024/06/05 15:44

枚举类里面可以有构造方法。

class  Test{public static void main(String[] args) {TrafficLamp t = TrafficLamp.YELLOW;System.out.println(t.getLampValue());   //2System.out.println(TrafficLamp.GREEN.getLampValue());  //3}public enum TrafficLamp{RED(),YELLOW(2),GREEN(3);private int lampValue = 0;private TrafficLamp(){};private TrafficLamp(int i){lampValue = i;};public int getLampValue(){return lampValue;}}}

枚举里面的抽象方法

class  Test{public static void main(String[] args) {TrafficLamp t = TrafficLamp.YELLOW;System.out.println(t.getTime());   //2System.out.println(TrafficLamp.GREEN.getTime());  //3}public enum TrafficLamp{RED{public TrafficLamp nextLamp(){return YELLOW;}},GREEN(50){public TrafficLamp nextLamp(){return YELLOW;}},YELLOW(5){public TrafficLamp nextLamp(){return RED;}};private int time = 0;private TrafficLamp(){};private TrafficLamp(int time){this.time = time;};public int getTime(){return time;}public abstract TrafficLamp nextLamp();}}

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