Java Interview Guide : 200+ Interview Questions and Answers - String, StringBuffer and StringBuilder

The video tutorial covers the concept of string immutability in Java, explaining that once a string object is created, its value cannot be changed. It discusses how strings are stored in memory, particularly in the string constant pool, and the implications of using string concatenation in loops, which can lead to performance issues. The tutorial compares String, StringBuffer, and StringBuilder, highlighting their differences in terms of mutability and thread safety. Practical exercises are suggested to explore these concepts further.

What does immutability mean in the context of strings in Java?

Explain how the concat method works in Java strings.

How are string values stored in memory in Java?

What are the implications of using the string concatenation operator in performance?

Why is it recommended to use StringBuilder or StringBuffer in loops?

Describe the performance difference between using String and StringBuffer.

What is the difference between String and StringBuffer in Java?