Enum accessing PRoblem

[Mohit G Gupta]

Problem-1

public class My
{
public enum cat{tom,com};
public static void main(String arg[])
{cat mudog=cat.com;
switch(mudog){
}
}}

if outside class

public enum Title{
SCIFI,HORROR
}
class a{
psvm
{
system.out.println(Title.HORROR);
}}

how is Title.HORROR prints HORROR in output.shouldn't a variable of type Title be made in public static void main(String arg[]) and then after assigning value it should be accessed
-----------------------------------------------
Problem-2

public class deleteme
{public enum cats{com, hom, tom};
public int a=12;
cats var;

public static void main(String [] args) {
 
 cats myDog = cats.tom;

 System.out.print(""+myDog);
deleteme a=new deleteme();
System.out.print(""+a.a);
a.var=cats.com;

}}

here enum is declared to be member of class deleteme

a)how can enum instance variable myDog be declared in main method of deleteme without object of deletme class ??
b)shouldn't it be done in the way as done with var of cats in class deleteme ??
c) cats myDog = cats.tom;
can i access myDog with class deleteme i.e.
a.myDog

[Wouter Oet]

Please PostRealCode. Psvm and sop will only cause confusion.

1. No Enum entries are static and can be accessed directly with the class name.
2A. The same reason.
2B. No.
2C. Try it.

Also Enums should have a capitalized name.

[Shanky Sohar]

problem 2

public class deleteme
{public enum cats{com, hom, tom};
public int a=12;
cats var;

public static void main(String [] args) {
 
 cats myDog = cats.tom;

 System.out.print(""+myDog);
deleteme a=new deleteme();
System.out.print(""+a.a);
a.var=cats.com;
}
}

a)how can enum instance variable myDog be declared in main method of deleteme without object of deletme class ??

Ans..because enum declared within a class are implicitly static,so it is perfectly fine

b)shouldn't it be done in the way as done with var of cats in class deleteme ??

Ans..or you can try it.

c) cats myDog = cats.tom;
can i access myDog with class deleteme i.e. a.myDog

Ans.. No sticly no...
the objects of enum are static and final(not the objects but basicallly the refernce variable are static variable)...myDog is a refernce variable which is already been assigned to cats.tom (i.e tom) which is final.
and i have not seen two refernce variable like this.a.myDOg(where "a" refernce variable for deleteme and "myDog" is final reference variable for cats which will always be point to "tom")

[Shanky Sohar]

how is Title.HORROR prints HORROR in output.shouldn't a variable of type Title be made in public static void main(String arg[]) and then after assigning value it should be accessed..

public enum Title{
SCIFI,HORROR
}
class a{
psvm
{
system.out.println(Title.HORROR);
}}

this is how enum works..

[Wouter Oet]

Head spinner:

public static void main(String... args) {
	Answer ans = null;
	System.out.println(ans.Works);
}

enum Answer{
	DoesNotCompile,
	RuntimeException,
	Works
}
    

[Shanky Sohar]

Wouter Oet wrote:Head spinner:

public static void main(String... args) {
	Answer ans = null;
	System.out.println(ans.Works);
}

enum Answer{
	DoesNotCompile,
	RuntimeException,
	Works
}
    

because ans is a refernce variable which is local to main method and local variable must be initialize before use.

[Wouter Oet]

The point I was trying to make is that it even works on a null reference of an enum variable.

[Shanky Sohar]

Great..