Class ArrayEnumeration

package example.array;
 
import java.lang.reflect.Array;
import java.util.Enumeration;
 
public class ArrayEnumeration implements Enumeration {
    private final int size;
 
    private int cursor;
 
    private final Object array;
 
    public ArrayEnumeration(Object obj) {
	Class type = obj.getClass();
	if (!type.isArray()) {
	    throw new IllegalArgumentException("Invalid type: " + type);
	}
	size = Array.getLength(obj);
	array = obj;
    }
 
    public boolean hasMoreElements() {
	return (cursor < size);
    }
 
    public Object nextElement() {
	return Array.get(array, cursor++);
    }
 
    public static void main(String args[]) {
	Object obj = new int[] { 2, 3, 5, 8, 13, 21 };
	ArrayEnumeration e = new ArrayEnumeration(obj);
	while (e.hasMoreElements()) {
	    System.out.println(e.nextElement());
	}
	try {
	    e = new ArrayEnumeration(ArrayEnumeration.class);
	} catch (IllegalArgumentException ex) {
	    System.out.println(ex.getMessage());
	}
    }
}