+ 24
Why strings are immutable in Java?
4 Respostas
+ 11
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).
+ 8
Good answer, Stacy. An additional advantage might be this: immutable strings are better suited as hash map keys.
+ 2
what are parameters
Costuma ter perguntas como essa?
Aprenda de maneira mais eficiente, de graça:
