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Possible Duplicate:
When to use intern()
When should we use intern method of String?
Does java intern strings automatically ? If it does why does string have an explicit intern method ? Any particular use cases when an explicit call is needed ?
Java does not intern strings created at run-time automatically. (It does do so for string constants at compilation time).
I had a specific use case where I saved ~30% of heap used in a component that was receiving records expressed in a map. The set of keys in each record were identical, yet every new record received created a new instances of the key strings. By interning the key strings, heap consumption was greatly reduced.