Free the memory of a String

Question

I am now creating a string object. I need to free the memory after using it,
I dereference it now like this:
String john = new String("John sucks");
john = null;
which doesn't free the memory the string object taken. Anybody have any suggestions of how to do it by using Garbage collection ? My friend told me that
a String object can be never removed from the memory, is it true or not?
Thank you very much

Answer 1

I am now creating a string object. I need to free the
memory after using it,
I dereference it now like this:
String john = new String("John sucks");
john = null;
which doesn't free the memory the string object taken.No it doesn't.
Anybody have any suggestions of how to do it by using
Garbage collection ? Forget about it.
My friend told me that
a String object can be never removed from the memory,
is it true or not?Did your friend not also tell you to not worry about it?
You have two strings.
1. The internal string represented by "John sucks"
2. A new string created by new String()
The first will not be cleaned (at least not without involved class loaders.)
The second will be cleaned when the garbage collector cleans it. Which it doesn't have to do until it feels like it.