String is one of the most used classes in Java! Both StringBuffer and StringBuilder classes provided methods to manipulate Strings. To understand the difference we will explore and compare these classes in Java and when it is best to use them.
String vs StringBuffer vs StringBuilder mutability?
- String is immutable 🗿
- StringBuffer is mutable 💥
- StringBuilder is mutable 💥
String vs StringBuffer vs StringBuilder thread safety?
- StringBuffer is thread-safe ✅
- StringBuffer is synchronized ✅
- StringBuilder is not thread-safe ❌
- StringBuilder is not synchronized ❌
StringBuilder vs StringBuffer which one is faster?
- StringBuilder is faster ✅
- StringBuffer is slower (due to being thread-safe) ❌
When to use StringBuilder and StringBufffer?
- String manipulation in a none-multithreaded environment use StringBuilder ✅
- String manipulation in a multithreaded environment use StringBuffer ✅
Table Summary
| StringBuffer | StringBuilder |
| Thread-Safe | Not Thread-Safe |
| Synchronised | Not Synchronised |
| Since Java 1.0 | Since Java 1.5 |
| Slower | Faster |
📚 Further Reading & Related Topics
If you’re exploring the difference between String, StringBuffer, and StringBuilder in Java, these related articles will provide deeper insights:
• Mastering String Handling in Java: Best Practices for Efficient String Operations – Learn best practices for using String, StringBuffer, and StringBuilder effectively in your Java applications to optimize performance and memory usage.
• Java Streams: Unleashing the Power of Functional Programming – Explore how Java Streams interact with string handling and how you can use StringBuilder or StringBuffer for efficient manipulation of string data in streams.









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