On the difference of string StringBuffer StringBuilder in Java _java

* The string class is immutable, and any modification to a string causes the new object to be generated.

* StringBuffer and StringBuilder are mutable classes, and any changes to the string do not produce new objects.

When used in practice, if you often need to modify a string, such as inserting, deleting, etc.

* But what's the difference between StringBuffer and StringBuilder?

StringBuffer is thread-safe and easy to use in multithreaded programs, but the program is less efficient.

StringBuilder is not thread-safe and is more efficient than stringbuffer in a single thread.

* Overall, the three operating time:

String > StringBuffer > StringBuilder

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