The enumeration type is part of the new features in Java 5. It is a special data type. The reason why it is special is because it is a class type but has more special constraints than the class type, but these constraints The existence of also created the simplicity, safety and convenience of enumerated types.
Enumeration type definition:
enum Day {
MONDAY, TUESDAY, WEDNESDAY,
THURSDAY, FRIDAY, SATURDAY, SUNDAY
}
use:
public static void main(String[] args){
//直接引用
Day day =Day.MONDAY;
}