Why can't I explicitly return void from a method?

Question

void run() {
    ...
    if (done) return cancel();
    ...
}

where cancel() return void. This won\'t compile... and I ca

Answer 1

From the JLS:

A return statement with no Expression must be contained in the body of a method that is declared, using the keyword void, not to return any value, or in the body of a constructor

...

A return statement with an Expression must be contained in a method declaration that is declared to return a value or a compile-time error occurs. The Expression must denote a variable or value of some type T, or a compile-time error occurs. The type T must be assignable to the declared result type of the method, or a compile-time error occurs.