String, StringBuffer, and StringBuilder
2015-04-10 10:01
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关于这三者的区别已经是老话题了，上stackoverflow看到目前最中肯简洁的回答
http://stackoverflow.com/a/2971343
Mutability Difference:
Stringis immutable,
if you try to alter their values, another object gets created, whereas
StringBufferand
StringBuilderare mutable so
they can change their values.
Thread-Safety Difference:
The difference between
StringBufferand
StringBuilderis
that
StringBufferis
thread-safe. So when the application needs to be run only in a single thread then it is better to use
StringBuilder.
StringBuilderis
more efficient than
StringBuffer.
Situations:
If your string is not going to change use a String class because a
Stringobject
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
StringBuilderis
good enough.
If your string can change, and will be accessed from multiple threads, use a
StringBufferbecause
StringBufferis
synchronous so you have thread-safety.
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