How can I clear or empty a StringBuilder?
java, stringbuilder
Solution
Two ways that work:
- Use `stringBuilderObj.setLength(0)`.
- Allocate a new one with `new StringBuilder()` instead of clearing the buffer. Note that for performance-critical code paths, this approach can be significantly slower than the `setLength`-based approach (since a new object with a new buffer needs to be allocated, the old object becomes eligible for GC etc).
Problem
I'm using a StringBuilder in a loop and every x iterations I want to empty it and start with an empty `StringBuilder`, but I can't see any method similar to the .NET StringBuilder.Clear in the documentation, just the delete method which seems overly complicated. So what is the best way to clean out a `StringBuilder` in Java?