class EnumTest
{
public static void main(String[] args)
{
  WeekDay weekday = WeekDay.nextDay();
  System.out.println(weekday);
}
}




abstract class WeekDay
{
private WeekDay(){}
public abstract WeekDay nextDay();
public static final WeekDay SUN = new WeekDay(){
  public  WeekDay nextDay()
  {
   return MON;
  }
};
public static final WeekDay MON = new WeekDay(){
  public  WeekDay nextDay()
  {
   return SUN;
  }
};
public static void main(String[] args)
{
  
}
}


编译出现静态不能访问非静态方法，可是我看张老师教程写的代码没有哪不一样呀。求找问题，求解

是这样的。因为枚举只能使用它创建好的对象中的任何一个。你只用了类名来调用。我看了你的代码应该没有贴完。还有抽象的方法吧。你调用的时候使用WeekDay weekday = WeekDay.SUN.nextDay();或者WeekDay weekday = WeekDay.MON.nextDay();都可以。

main方法里错了：WeekDay weekday = WeekDay.nextDay();   //不能通过类名访问非静态方法。
WeekDay weekDay =WeekDay.SUN.nextDay();