Enum

enum EnumTest {
MON, TUE, WED, THU, FRI, SAT, SUN;
}
public class Main {
public static void main(String[] args) {

for (EnumTest e : EnumTest.values()) {
System.out.println(e.toString());
}

System.out.println("----------------我是分隔线------------------");

EnumTest test = EnumTest.SAT;
System.out.println(test.ordinal());
switch (test) {
case MON:
System.out.println("今天是星期一");
break;
case TUE:
System.out.println("今天是星期二");
break;
// ... ...
default:
System.out.println(test);
break;
}
}
}