Question
Why String class is final or immutable?
Answers
String has been widely used as parameter for many java classes e.g. for opening network connection you can pass hostname and port number as string , you can pass database URL as string for opening database connection, you can open any file in Java by passing name of file as argument to File I/O classes.

In case if String is not immutable, this would lead serious security threat, I mean some one can access to any file for which he has authorization and then can change the file name either deliberately or accidentally and gain access of those file. This is some time asked as Why Char array is better than String for Storing password in Java in interviews as well.

The absolutely most important reason that String is immutable is that it is used by the class loading mechanism, and thus has profound and fundamental security aspects.   Your Comment




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