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Possible Duplicate:
Basic Java question: String equality
Given
String s= "God";
String k= "God";
Will both s and k be considered to be referring to the same String object? Is there a single instance of String object?
Yes, Java should optimize this so that
s == kto save memory.(The references s and k references to the same object).
Since java do not have pointers, you cannot change the string that s or k points at,
but you can of course change what string that s or k points at. If java would allow pointers,
then a change on what s points as, and the optimization above would have bad consequences.
That is why one should NOT use a string like “LOCK” to lock threads on,
since if third-party jar files does the same, you will BOTH, unknowingly, be using the same object as a thread lock, which might yield very strange and hard-to-find bugs.