import org.xml.sax.XMLReader; public class IsEnum { public static void main(String[] args) { System.out.println(Size.class.isEnum()); System.out.println(String.class.isEnum()); System.out.println(String.class.isInstance("Test")); System.out.println(XMLReader.class.isInterface()); } } enum Size { S, M, L, XL, XXL, XXXL; }