Java Application Performance Tuning using String Builders

String greeting = “Hi”;greeting = greeting + “,” + “Happy Birthday” + “,” + “ Alex” + “!!”;
StringBuilder greeting = new StringBuilder("Hi");greeting = greeting.append(“,”).append(“Happy Birthday”).append(“,”).append(“ Alex”).append(“!!”);
  • Use String — If a string is going to remain constant throughout the program.
  • Use String Builder — If a string can manipulate(change) a lot during the program execution and will only be accessed from a single thread.



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Anuradha Karunarathna

Anuradha Karunarathna

Senior Software Engineer@ WSO2 | Computer Science and Engineering graduate@ University of Moratuwa, SriLanka