Web Reference: Dec 2, 2024 · String Interning in Java is a process of storing only one copy of each distinct String value, which must be immutable. Applying String.intern () on a couple of strings will ensure that all strings having the same contents that shares the same memory. Apr 11, 2025 · The method intern () creates an exact copy of a String object in the heap memory and stores it in the String constant pool. Note that, if another String with the same contents exists in the String constant pool, then a new object won’t be created and the new reference will point to the other String. With the exception of manual calls to String.intern, only string literals result in interned strings. While I would recommend using a specialized collection for such cases, interning may be useful where it can be used to avoid creating extra duplicate objects.
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