Please tell me a real time situation to compare String
, StringBuffer
, and StringBuilder
?
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Answer
Mutability Difference:
String
is immutable, if you try to alter their values, another object gets created, whereas StringBuffer
and StringBuilder
are mutable so they can change their values.
Thread-Safety Difference:
The difference between StringBuffer
and StringBuilder
is that StringBuffer
is thread-safe. So when the application needs to be run only in a single thread then it is better to use StringBuilder
. StringBuilder
is more efficient than StringBuffer
.
Situations:
- If your string is not going to change use a String class because a
String
object is immutable. - If your string can change (example: lots of logic and operations in the construction of the string) and will only be accessed from a single thread, using a
StringBuilder
is good enough. - If your string can change, and will be accessed from multiple threads, use a
StringBuffer
becauseStringBuffer
is synchronous so you have thread-safety.