In computer science, string interning is a method of storing only one copy of each distinct string value, which must be immutable. Interning strings makes some string processing tasks more time- or space-efficient at the cost of requiring more time when the string is created or interned. The distinct values are stored in a string intern pool.
The single copy of each string is called its 'intern' and is typically looked up by a method of the string class, for example
String.intern() in Java. All compile-time constant strings in Java are automatically interned using this method.[1]
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