Java: What is the use of intern() method present in Object class?

Answer 1

intern method is used to assign the string to String pool whenever you create a string using the new operator

String s= new String("xnsf"); //memory assigned in heap
s.intern() ; //sends it to the string pool.

Answer 2

When you call intern() method, jvm will check if the given string is there, in string pool or not. If it is there, it will return a reference to that, otherwise it will create a new string in pool and return reference to that. In case : System.out.println(new String("ABC").intern()==new String("ABC").intern());

The first new String("ABC").intern() will create a string "ABC" in pool.When you call new String("ABC").intern() second time, jvm will return the reference to previously created string.That is the reason you are getting true when comparing both(both are pointing to same reference).