public abstract class WeekDay {
private WeekDay() {
}
public final static WeekDay MON = new WeekDay() {
@Override
public WeekDay nextDay() {
return SON;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "SON";
}
};
public final static WeekDay SON = new WeekDay() {
@Override
public WeekDay nextDay() {
return MON;
}
@Override
public String toString() {
// TODO Auto-generated method stub
return "MON";
}
};
public abstract WeekDay nextDay();
}
作者“Jxiaolei”