What is Operator Overloading?
A few object oriented languages, notably C++, permit you to not only overload techniques but also operators like + or -. This is very menaingful while dealing with user defined mathematical classes such as complex numbers where + and - have well-defined meanings.
Therefore most non-mathematical classes do not have obvious meanings for operators like + and -. Experience has shown in which operator overloading is a large contributor to making multi-person programming projects infeasible. Therefore Java does not support operator overloading.