Java FAQ: Top Questions

String , StringBuilder , and StringBuffer handle text, but differ in mutability and thread safety.

• String:
  • Immutable; any modification creates a new object.
  • Thread-safe due to immutability.
  • Suitable for fixed text (e.g., constants).
• StringBuilder:
  • Mutable; modifies the same object.
  • Not thread-safe; faster for single-threaded operations.
  • Ideal for string manipulation in loops.
• StringBuffer:
  • Mutable; like StringBuilder but thread-safe (synchronized methods).
  • Slower due to synchronization overhead.
  • Used in multithreaded environments.