Doubt about Enum .

[Manishk Rai]

The following piece of code

 

 
enum AccountType {
         SAVING, FIXED;
        private AccountType() {
             System.out.println("It is a account type");
         }       
    }
    class EnumOne {
      public static void main(String[] args) {
        System.out.println(AccountType.SAVING);    
      }
    }
 

    

prints the output

It is a account type
It is a account type
SAVING

I think the correct o/p is
It is a account type
SAVING
Because it calls the constructor ( private) implicitly .
But why one exta "It is a account type" .
Thanks

[Sergey Petunin]

When you first use the enum type, every single enum constant is initialized, that is, the constructor for this constant is called.

So when you try to print an AccountType constant in your main method, the constructor is called once for every initialization constant.

But after that it will never be called again, no matter how much you use the constants. So if we change the main method like this:

public static void main(String[] args) {
    System.out.println(AccountType.SAVING);
    System.out.println(AccountType.FIXED);
    System.out.println(AccountType.SAVING);
    System.out.println(AccountType.FIXED);
}

, the output is going to be:

It is a account type
It is a account type
SAVING
FIXED
SAVING
FIXED

[sree visu]

a very nice answer .hats off...

[Manishk Rai]

Thanks Serge