Declare a string

Question

what is the difference between :

String s1;

And

String s1 = new string();

How does the memory operate?

@user7 The OP isn't asking about the string pool. In this case, the first statement doesn't create an object at all. — azurefrog, Nov 23 '15 at 07:47

Amit · Answer 1 · 2015-11-23T07:59:43.307

2

String s1;

Is either:

An uninitialized local variable. Attempting to use s1 without first assigning a value will result in a compilation error.
An uninitialized field. It will have a default value (null).

String s1 = new String();

Is a variable or field initialized to an empty string;

The first declares an identifier or field for later use, while the second allocates and assigns a value (empty string) to the identifier.

edited Nov 23 '15 at 07:59

answered Nov 23 '15 at 07:47

Amit

1

"Attempting to use s1 without first assigning a value will result in a compilation error." Not necessarily - it only will if it is a local variable. – Andy Turner Nov 23 '15 at 07:55
@AndyTurner - good point, will add that too. – Amit Nov 23 '15 at 07:57

1 Answers1