Why is myString.equals(“aString”); different from “aString”.equals(myString);?

Question

I heard several times that in using boolean equals(Object o) to compare Strings, it\'s better to put the constant on the left side of the function

Answer 1

This is a defensive technique to protect against NullPointerExceptions. If your constant is always on the left, no chance you will get a NPE on that equals call.