Difference between String, StringBuffer and StringBuilder in Java - Java Interview Question

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[a] based on => mutability difference

String => immutable [if you try to alter their value, another object gets created]
StringBuffer, StringBuilder => mutable

[b] based on => thread safety difference

StringBuffer
  • thread safe [synchronized]
  • it means: two/more threads can't call the methods of StringBuffer simultaneously
  • less efficient 

StringBuilder 
  • not thread safe [non-synchronized]
  • it means two/more threads can call the methods of StringBuilder simultaneously
  • more efficient/faster

Situations to use:
  • if your string is not going to change - use String
  • if your string can change & will only be accessed from a single thread - use StringBuilder
  • if your string can change & can be accessed from multiple threads- use StringBuffer

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