enum is Java keyword ?

[TH Eee]

Hi,
I wonder that when I try some mock exams especially the question relate to keyword , 'enum' is not treated as keyword.

When I check the list of keyword provided by sun website,
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html
enum is included.

My question is 'enum' a keyword ?

Thank You.

[Paul Sturrock]

Sounds like the mock exams your are trying are for a pre-1.5 version of Java. enmus were introduced in that version.

[Neerav Narielwala]

In the Java programming language, you define an enum type by using the enum keyword. For example, you would specify a days-of-the-week enum type as:

public enum Day {
SUNDAY, MONDAY, TUESDAY, WEDNESDAY,
THURSDAY, FRIDAY, SATURDAY
}

You should use enum types any time you need to represent a fixed set of constants. That includes natural enum types such as the planets in our solar system and data sets where you know all possible values at compile time�for example, the choices on a menu, command line flags, and so on.

Here is some code that shows you how to use the Day enum defined above:

public class EnumTest {
Day day;

public EnumTest(Day day) {
this.day = day;
}

public void tellItLikeItIs() {
switch (day) {
case MONDAY: System.out.println("Mondays are bad.");
break;

case FRIDAY: System.out.println("Fridays are better.");
break;

case SATURDAY:
case SUNDAY: System.out.println("Weekends are best.");
break;

default: System.out.println("Midweek days are so-so.");
break;
}
}

public static void main(String[] args) {
EnumTest firstDay = new EnumTest(Day.MONDAY);
firstDay.tellItLikeItIs();
EnumTest thirdDay = new EnumTest(Day.WEDNESDAY);
thirdDay.tellItLikeItIs();
EnumTest fifthDay = new EnumTest(Day.FRIDAY);
fifthDay.tellItLikeItIs();
EnumTest sixthDay = new EnumTest(Day.SATURDAY);
sixthDay.tellItLikeItIs();
EnumTest seventhDay = new EnumTest(Day.SUNDAY);
seventhDay.tellItLikeItIs();


}
}


The output is:

Mondays are bad.
Midweek days are so-so.
Fridays are better.
Weekends are best.
Weekends are best.

Java programming language enum types are much more powerful than their counterparts in other languages.