public modifier

[Richard Rex]

Hi all ranchers,

The code below is saved using the file named "ATest.java".

public interface AnInterface {
public void methodOne() throws Exception;
}

class AnInterfaceImpl implements AnInterface {
public void methodOne(){
System.out.println("I will never throw an exception");
}
}

public class ATest {
public static void main(String args[]) {
AnInterfaceImpl ai = new AnInterfaceImpl();
ai.methodOne();
}
}

If I try to compile this code, I got this error:
"class AnInterface is public, should be declared in file named AnInterface.java"

Why does JVM complains about the public access modifier? And besides, AnInterface was declared as an interface and not a class. The code also contains ATest.java declared as public. So why is this complaining?

[Jon Lee]

Interface is a special class.

Bottom line: interface IS A class. At least the compiler thinks so.

[Richard Rex]

Hi jon,

You mean we are allowed only to have one public access modifier for all top-level classes, interfaces & abstract classes in a single file?

Correct me if I'm wrong.

Thanks!

[Jon Lee]

That is correct, chad.

[Richard Rex]

Hi jon,

Thanks a lot!