juniorStrings
What is the String Pool in Java/C#?
Updated Apr 28, 2026
Short answer
A special memory region (part of the heap) that stores unique string literals to save space.
Deep explanation
Strings are one of the most common data types. A special memory region (part of the heap) that stores unique string literals to save space. Understanding how they are represented (ASCII/UTF-8/UTF-16) is key to solving character encoding issues.
Real-world example
Storing user names or IDs in an application.
Common mistakes
- Modifying a string inside a long loop without using a StringBuilder/StringBuffer.
Follow-up questions
- What is the time complexity of concatenation?