Arrays - Java - page 384

To get the full potential from an enumerated type, you need some way to cycle
through all the values of an enumerated type. The static method values() provides
you with that ability. The static method values() returns an array whose elements are
the values of the enumerated type. The static method values() is provided automati-
cally for every enumerated type. Display 6.15 gives a simple example of using the
method values() to cycle through all the values in an enumerated type. (This is one
situation where it is much cleaner to use a for-each loop instead of an ordinary for
loop. If you have read the starred section on the for-each loop, be sure to do Self-Test
Exercise 22, which redoes Display 6.15 using a for-each loop.)

The values Method
Every enumerated type has a static method named values() , which returns an array whose
elements are the values of the enumerated type in the order in which they are listed in the
definition of the enumerated type. The base type for the array returned is the enumerated
type. See Display 6.15 for an example.

Display 6.15 The Method values (part 1 of 2)

1 import java.util.Scanner;

2
3 public class EnumValuesDemo
4{

5 enum WorkDay {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY};

6 public static void main(String[] args)

7 {

8 WorkDay[] day = WorkDay.values();

9 Scanner keyboard = new Scanner(System.in);

10 double hours = 0, sum = 0;

This is equivalent to day[i].toString() .

11 for ( int i = 0; i < day.length; i++)

12 {

13 System.out.println("Enter hours worked for " + day[i]);

14 hours = keyboard.nextDouble();

15 sum = sum + hours;

16 }

17 System.out.println("Total hours work = " + sum);

18 }

19 }