a question on creating string object.

I read in the book that

String str = new String("abc");

creates two objects and one reference variable. My question is how is that two object..Can anybody explain me?

Thanks in advance,
Rahul

Search the forums. This question has been discussed before.

Maneesh Godbole wrote:Search the forums. This question has been discussed before.

Check THIS

Two string objects would be there, one in the pool, and one on the heap as well. Here you are explicitly creating a new String object that copies its contents from the string exist in the string pool.

bottom-line : never use new String("..")

bottom-line : never use new String("..")

I was always taught to use the new keyword to copy existing information into new objects, something called a deep copy. Is this a bad practice?

-Hunter

String objects in Java are immutable (there's no way to change the contents of a String, by design) and therefore they never need to be copied.

Normally not, but classes like String and the primitive wrappers (Integer, Boolean, etc) are immutable. That means that once created they can never change. It is therefore safe to share them among multiple objects, methods and threads without any problems.

Oh. Well thanks for clarifying that, this deep copy technique I was shown must be leftover from a language where they weren't immutable.

Thanks,
Hunter