StringBuilder vs StringBuffer in Java | Mutable Strings, Thread Safety & Performance | Core Java

In this video, we’ll understand StringBuilder and StringBuffer in Java with simple examples and interview-focused explanations. We’ll cover the key differences between StringBuilder and StringBuffer, including mutability, synchronization, thread safety, performance, and real-world usage. 📚 Topics Covered What is StringBuilder? What is StringBuffer? Why are they mutable? StringBuilder vs StringBuffer synchronized meaning in Java Thread safety Why StringBuilder is generally faster When to use StringBuffer append(), insert(), delete(), reverse() Converting StringBuilder/StringBuffer to String using toString() Interview questions and answers. 🎯 Interview Quick Revision StringBuilder → Mutable → Not synchronized → Generally faster → Suitable for single-threaded scenarios StringBuffer → Mutable → Synchronized → Thread-safe → Generally slower This video is useful for Core Java beginners, Java developers, backend developers, and Java interview preparation.