public abstract class WeekDay {
private WeekDay(){}
private final static WeekDay MON=new WeekDay(){
@Override
public WeekDay nextday() {
// TODO Auto-generated method stub
return SUN;
}
};
final static WeekDay SUN=new WeekDay(){
@Override
public WeekDay nextday() {
// TODO Auto-generated method stub
return MON;
}
};
public abstract WeekDay nextday();
// public WeekDay nextDay()
// {
// if(this==SUN)
// {
// return Mon;
// }else{
// return SUN;
// }
// }
public String toString()
{
return this==SUN?"sun":"mon";
}
}
public class numerDemo {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
WeekDay weekDay=WeekDay.SUN;
System.out.println(weekDay.nextday());
==========================================================//调用上面的WeekDay
WeekDay1 weekDay2=WeekDay1.FRI;
System.out.println(weekDay2.name());
System.out.println(weekDay2.ordinal());
System.out.println(weekDay2.getClass());
System.out.println(WeekDay1.valueOf("SUN"));
System.out.println(WeekDay1.values().length);
}
public enum WeekDay1{
SUN,MON,TUE,WED,THI,FRI,SAT
}
}
枚举的抽象的应用
package numDemo;
public class EnumTest {
public static void main(String[] args) {
WeekDay weekDay2=WeekDay.FRI;
}
public enum WeekDay{
SUN(1),MON,TUE,WEN,THT,FRI,SAT;
private WeekDay(){
System.out.println("first");}
private WeekDay(int day){
System.out.println("second");
}
}
public enum TrafficLamp{
RED(30){
@Override
public TrafficLamp nextlamp() {
// TODO Auto-generated method stub
return GREEN;
}
},
GREEN(45){
@Override
public TrafficLamp nextlamp() {
// TODO Auto-generated method stub
return YELLOW;
}
},
YELLOW(5){
@Override
public TrafficLamp nextlamp() {
// TODO Auto-generated method stub
return RED;
}
};
public abstract TrafficLamp nextlamp();
private int time;
private TrafficLamp(int time){this.time=time;};
}
}
