Class objects
represent interfaces as well as classes.
If you aren't sure whether a Class
object represents an interface or a class, call the isInterface method.
You invoke Class methods
to get information about an interface.
To find the public
constants of an interface, invoke the getFields method upon the Class
object that represents the interface.
The section
Identifying Class Fields
has an example containing getFields.
You can use getMethods to get
information about an interface's methods.
See the section Obtaining Method Information.
To find out about an interface's modifiers, invoke the
getModifiers method.
See the section Discovering Class Modifiers
for an example.
By calling isInterface,
the following program
reveals that Observer is an interface and that
Observable is a class:
import java.lang.reflect.*;
import java.util.*;
class SampleCheckInterface {
public static void main(String[] args) {
Class observer = Observer.class;
Class observable = Observable.class;
verifyInterface(observer);
verifyInterface(observable);
}
static void verifyInterface(Class c) {
String name = c.getName();
if (c.isInterface()) {
System.out.println(name + " is an interface.");
} else {
System.out.println(name + " is a class.");
}
}
}
The output of the preceding program is:
java.util.Observer is an interface.
java.util.Observable is a class.
