import java.lang.reflect.Array;
import java.util.Enumeration;
final public class ArrayEnumerationFactory {
static public Enumeration makeEnumeration(final Object obj) {
Class type = obj.getClass();
if (!type.isArray()) {
throw new IllegalArgumentException(obj.getClass().toString());
} else {
return (new Enumeration() {
int size = Array.getLength(obj);
int cursor;
public boolean hasMoreElements() {
return (cursor < size);
}
public Object nextElement() {
return Array.get(obj, cursor++);
}
});
}
}
public static void main(String args[]) {
Enumeration e = makeEnumeration(args);
while (e.hasMoreElements()) {
System.out.println(e.nextElement());
}
e = makeEnumeration(new int[] { 1, 3, 4, 5 });
while (e.hasMoreElements()) {
System.out.println(e.nextElement());
}
try {
e = makeEnumeration(new Double(Math.PI));
} catch (IllegalArgumentException ex) {
System.err.println("Can't enumerate that: " + ex.getMessage());
}
}
}