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String.intern()

 
Amit Punjwani
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Could anyone tell me what does the method intern() of the String class actually do? Can anyone explain it with an example?
 
Ajith Kallambella
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Here is what the API documentation says about the intern() method

Returns a canonical representation for the string object.
A pool of strings, initially empty, is maintained privately by the class String.
When the intern method is invoked, if the pool already contains a string equal to this String object as determined by the equals(Object) method, then the string from the pool is returned. Otherwise, this String object is added to the pool and a reference to this String object is returned.
It follows that for any two strings s and t, s.intern() == t.intern() is true if and only if s.equals(t) is true.
All literal strings and string-valued constant expressions are interned. String literals are defined in �3.10.5 of the Java Language Specification
Returns:
a string that has the same contents as this string, but is guaranteed to be from a pool of unique strings.

I wrote a small program to help you understand this.

If you don't understand anything, feel free to ask for more
Good luck,
Ajith
 
Amit Punjwani
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Thanx a lot Ajith that really helped
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