Why String is immutable or final in Java
final, immutability, java, string
Solution
It is mainly for security reasons. String is used as parameter in network connection, database url etc. It can be easily attacked if it is mutable
Immutability of `String` solves some synchronization issues, it makes the `String` thread safe
To support StringPool facility
To cache the `hashcode` of `String`
To support class loading mechanism in which `String` is used as arguments. String being mutable results in wrong class being loaded
Problem
As i was told this is important String Interview question in Java, which starts with discussion of " What is String ", how String is different in java than in C or C++ and then you are asked about immutable objects and you're asked the main question: " Why String is immutable or final in Java ". Can you share your Ideas ? Thanks in advance.