Answer Posted / vijay srivastava

Most of the Answers are correct but they are not much clear so I am trying write clear Answer. I hope, you guys will like it.

String pooling is the mechanism that was introduced by Java.
String pooling is possible because String is immutable and final class.

1- String firstString = "Hello";
2- String secondString = "Hello";
3- String thirdString = new String("Hello");
There is no guarantee to create new object for string Step 1 and 2 but in step 3, Jave(JVM) gives guarantee to create object.
In step 1st and 2nd, JVM search the same literal in String pool if it's available then return the reference else JVM will create the object for same and added in to String pool.
In step 3, JVM definitely create the new object, It will not part of String pool. If we want this newly created object should be part of String pool then we need to call intern() method of String class. If we called intern() method then JVM will search the same literal in String pool if JVM found same literal then return reference else JVM will add the same object in String pool.

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