On 06/06/2020 22:48, Erick Erickson wrote:
> When is there a good reason to use StringBuffer rather than StringBuilder?
> While going through some of the warnings I happened to run across a few of
> these. I haven’t changed them, and at least one (AuditEvent) has a comment
> about back-compat and is quite recent…
StringBuffer hardly ever makes sense. Sure, it's synchronized, but it
usually doesn't do what you want.
If Thread 1 and Thread 2 each call
sb.append("1");
sb.append("2");
sb.append("3");
the result likely won't be "123123". Appending each individual append
operation is synchronized and "safe", but multiple consecutive calls are
not. So unless you're either using an external synchronization
mechanism, or are appending things "atomically", you can still get
screwed. With that in mind, StringBuffer's synchronization is almost
always useless overhead.
- Bram
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