Can you have multiple classes in one .java file ?

Question

or am I being dumb ;-)
I'm guessing not because the filename has to match the classname but maybe you can ... ?
C

Answer 1

To elaborate a bit more. The public class must match the filename, however you can declare "inner" classes.
An inner class can be declared inside another class, or even inside another method. Where you declare that class dictates the scope it will have. However, the lack of an ability to declare these classes public (a public class must be declared inside a java file with the same name), means that they are not visible anywhere else. However, they do still have plenty of uses.
Declaring a class inside a method is used rarely, but would look something like
public void foo(Bar myBar = new Bar
        private String baz = "Hello";
        public String doSomething()
             return baz;
     myBar.doSomething()
}This declares and implements the class Bar inside the method header. Sure, this is a pretty useless example, but you could put any methods or variables inside your inner class, and they would be available only during execution of that method. (ie. only have method scope).
}