Java Interview Questions

These are must know Java interview FAQs. If you don’t get these Java interview questions right, you will not be getting an offer.

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Q2. Can you explain how Strings are interned in Java?

A2. String class is designed with the Flyweight design pattern in mind. Flyweight is all about re-usability without having to create too many objects in memory.

A pool of Strings is maintained by the String class. When the intern( ) method is invoked, equals(..) method is invoked to determine if the String already exist in the pool. If it does then the String from the pool is returned instead of creating a new object. If not already in the string pool, a new String object is added to the pool and a reference to this object is returned. For any two given strings s1 & s2, s1.intern( ) == s2.intern( ) only if s1.equals(s2) is true