Finally, we can return specific values from our methods. Let’s see how this might be used. Let’s say we decide we want the method to provide our greeting but not display it onto the screen.

The method header’s return type must be a primitive type (e.g., int), java.lang.String, java.lang.Class, an enum, an annotation type, or an array of one of these types. No other type can be ...

Indeed, if a Java Map implementation allows for null values, then it is possible for the Map to return its value for the given key, but that value might be a null.