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.

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