Archive for category Java Enums
enum as a class
Posted by Chirag Jain in Java, Java Enums on May 5, 2010
Here I have compared enum with a class. In java, enums are like classes. What I have done here is, if we have to write a class that works like en enum, how can we do it. Though it is not of practicle use,what I have tried is to make the concept clear about enums.By comparing enum with a class, we can understand how enums work.
Here DayEnum is a enum and DayClass is class for that enum.
enum DayEnum {
SUNDAY, MONDAY
}
class DayClass {
String value;
public DayClass (String str)
{
value=str;
}
static DayClass SUNDAY, MONDAY;
static
{
SUNDAY = new DayClass("SUNDAY");
MONDAY = new DayClass("MONDAY");
}
}
public class Test
{
public static void main(String args[])
{
DayClass dayClass = DayClass.SUNDAY;
DayEnum dayEnum = DayEnum.SUNDAY;
System.out.print("dayClass "+dayClass.value+" \n dayEnum "+dayEnum);
}
}
Here SUNDAY, MONDAY
are similar to static objects of Day if Day were a class.
We use enum as:
DayEnum day = DayEnum.SUNDAY;
enums are like constants. To simulate that, I have used value in DayClass. So every object of DayClass has an integer value associated with it.