What is the difference between using the concat method and the + operator for Java string concatenation?

General Discussions
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1

I’ve noticed both concat method and the + operator being used for Java string concatenation. I’m curious—which one performs better and follows best practices? In what scenarios should each be preferred, and are there any key differences to be aware of?

2

If you’re looking for a simple and easy-to-read way to perform Java string concatenation, the + operator is your best friend:

String fullName = "John" + " " + "Doe";

:white_check_mark: Why use this?

  • More readable than concat method.
  • Compiler optimizes simple + operations, making them efficient.
  • Works well for a few concatenations.

:rotating_light: When to avoid?

If you’re concatenating strings in a loop, + creates new objects each time, leading to performance issues.