String, StringBuffer and StringBuilder
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This document compares the Java String, StringBuffer, and StringBuilder classes. It notes that String is immutable, while StringBuffer and StringBuilder are mutable. StringBuffer is thread-safe as its methods are synchronized, while StringBuilder is not thread-safe. String should be used for immutability, StringBuffer when mutability and thread-safety are needed, and StringBuilder for mutability without thread-safety but better performance.
String, StringBuffer and StringBuilder
- 1. Java String, StringBuffer and StringBuilder Sujit Kumar Zenolocity LLC Copyright @
- 2. Mutability • String is immutable – cannot change once it has been created. • StringBuffer is mutable. • StringBuilder is mutable.
- 3. Thread Safety • StringBuffer is thread-safe => all methods are synchronized. • StringBuilder is NOT thread-safe. • Slight performance overhead with using StringBuffer class as compared to using the StringBuilder class.
- 4. When to use each? • Use String if you require immutability • Use StringBuffer if you need mutability and thread-safety. • Use StringBuilder if you need mutability but no thread-safety but better performance.