Overloaded methods are differentiated by the number and the type of the arguments passed into the method. In the code sample, draw(String s) and draw(int i) are distinct and unique methods because they require different argument types.
You cannot declare more than one method with the same name and the same number and type of arguments, because the compiler cannot tell them apart.
The compiler does not consider return type when differentiating methods, so you cannot declare two methods with the same signature even if they have a different return type.