String vs StringBuilder vs StringBuffer 🔥 | Java Interview Question Explained

Published: 17 February 2026
on channel: codeWithKhan

What is the difference between String, StringBuilder, and StringBuffer in Java?

In interviews, most candidates answer:

“String is immutable, StringBuilder is fast, StringBuffer is thread-safe.”

But that’s not enough.

In this video, we deeply explain:

• Why String is immutable
• How String Constant Pool works
• Memory behavior in Heap and Stack
• Why StringBuilder is faster
• How synchronization makes StringBuffer thread-safe
• What actually happens during string concatenation
• When to use which in real-world projects

This is one of the most frequently asked Core Java interview questions for freshers and experienced developers.

If you’re preparing for:

Java Interviews
Spring Boot Interviews
Backend Developer roles
Software Engineer interviews

This video will strengthen your fundamentals.

📚 Part of the Java Interview Questions Series.
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