What is the By-Default value of a reference variable of a class which hasn't allocated any memory?

Question

class D 
    {
        public static void main(String[] args) 
            {
                D d;   // d is a reference variable of class D. what is its value?
                System.out.println(d);//An initializing error occurs.
            }
   }

Above given is a java program having A class name D which is referred to a reference variable d. I want to know what is the default value of d as of an uninitialized variable

Since your code will not compile, the variable never has *any* value. — khelwood, Feb 02 '18 at 13:20

score 1 · Accepted Answer · answered Feb 02 '18 at 13:17

1

It's gives an error because d is a local variable and all local variables must be initialized before they can be referenced. If d were to be an instance variable then the default value would be null. That said to fix the error in your code you have to fix a default value for d.

D d = null;

answered Feb 02 '18 at 13:17

cdaiga

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Please explain this with an errorless code. – Abin Isaac Feb 02 '18 at 13:40
Replace `D d;` in your code with `D d = null;`. My answer is pretty clear, that's just the rule in java. – cdaiga Feb 02 '18 at 14:29
Thanks for the clarification.....!! – Abin Isaac Feb 10 '18 at 02:28

What is the By-Default value of a reference variable of a class which hasn't allocated any memory?

1 Answers1