枚举类命名出现问题

Question

public class EnumLession16 {
public static void main(String[] args) {
WeekDay weekday=WeekDay.MON;     //在这行只要是引用到枚举类名的都提示错误,很迷惑啊
System.out.println(weekday.nextday());

public enum WeekDay{     //这里提示错误  The member enum WeekDay cannot be local
SUN,MON(){
public WeekDay nextday(){
return TUE;
}
},TUE,WED,THU,FRI,SAT;

private WeekDay(){
System.out.println("first2");
}
public abstract WeekDay nextday();
private int time;
private WeekDay(int day){
System.out.println("second");
}
}
public enum TrafficLamp{     //这里提示错误  The member enum TrafficLamp cannot be local
RED{
public TrafficLamp nextlamp(){
return GREEN;
}
},
GREEN{
public TrafficLamp nextlamp(){
return YELLOW;
}
},
YELLOW{
public TrafficLamp nextlamp(){
return RED;
}
};
public abstract TrafficLamp nextlamp();
} }}请各位高人帮忙批评指正

Answer 1

你把枚举类都定义在main中干什么?
 

Answer 2

我现在用的是JDK1.4（开发项目时甲方规定），不支持枚举。
我帮你改不了代码，请别人帮你改一下吧。

Answer 3

正解，枚举别写在方法中（不仅是main方法中）。

Answer 4

==============================
不只有这个问题，还有其它问题。看看他写的枚举吧：public enum WeekDay{     //这里提示错误  The member enum WeekDay cannot be local
            SUN,MON(){
                public WeekDay nextday(){
                    return TUE;
                }
            },TUE,WED,THU,FRI,SAT;
            
            private WeekDay(){
                System.out.println("first2");
            }
            public abstract WeekDay nextday();
            private int time;
            private WeekDay(int day){
                System.out.println("second");
            }
        }

Answer 5

先把 你两个enum 定义拿出来,单独用2个Java文件定义.其次SUN,MON(){
                public WeekDay nextday(){
                    return TUE;
                }
            },TUE,WED,THU,FRI,SAT;
需要把SUN,TUE..等都实现nextday方法,不然会报错

Answer 6

public class EnumLession16 {
    public static void main(String[] args) {
        WeekDay weekday=WeekDay.MON;     
        System.out.println(weekday.nextday());
    }
    
    public enum WeekDay{    
        SUN {
public WeekDay nextday() {
return MON;
}
},
MON(){
            public WeekDay nextday(){
                return TUE;
            }
        },
        TUE {
public WeekDay nextday() {
return WED;
}
},
        WED {
public WeekDay nextday() {
return THU;
}
},
        THU {
public WeekDay nextday() {
return FRI;
}
},
        FRI {
public WeekDay nextday() {
return SAT;
}
},
        SAT {
public WeekDay nextday() {
return SUN;
}
};
        
        private WeekDay(){
            System.out.println("first2");
        }
        public abstract WeekDay nextday();
        private int time;
        private WeekDay(int day){
            System.out.println("second");
        }
    }
    public enum TrafficLamp{    
        RED{
            public TrafficLamp nextlamp(){
                return GREEN;
            }
        },
        GREEN{
            public TrafficLamp nextlamp(){
                return YELLOW;
            }
        },
        YELLOW{
            public TrafficLamp nextlamp(){
                return RED;
            }
        };
        public abstract TrafficLamp nextlamp();
    }
}
改成这样或许会好一点，容易理解。