Y string is immutable

Question

tell me

Answer 1

check it once!!
https://code.sololearn.com/cRFSi8C88PYG/?ref=app

Answer 2

String is immutable for several reasons, here is a summary:
Security: parameters are typically represented as String in network connections, database connection urls, usernames/passwords etc. If it were mutable, these parameters could be easily changed.Synchronization and concurrency: making String immutable automatically makes them thread safe thereby solving the synchronization issues.Caching: when compiler optimizes your String objects, it sees that if two objects have same value (a="test", and b="test") and thus you need only one string object (for both a and b, these two will point to the same object).Class loading: String is used as arguments for class loading. If mutable, it could result in wrong class being loaded (because mutable objects change their state).
answer source:
http://stackoverflow.com/questions/22397861/why-is-string-immutable-in-java