// typeinfo/toys/ToyTest.java // Testing class Class. package typeinfo.toys; interface HasBatteries {} interface Waterproof {} interface Shoots {} class Toy { // Comment out the following no-arg constructor // to see NoSuchMethodError from (*1*) Toy() {} Toy(int i) {} } class FancyToy extends Toy implements HasBatteries, Waterproof, Shoots { FancyToy() { super(1); } } public class ToyTest { static void printInfo(Class cc) { System.out.println("Class name: " + cc.getName() + " is interface? [" + cc.isInterface() + "]"); System.out.println("Simple name: " + cc.getSimpleName()); System.out.println("Canonical name : " + cc.getCanonicalName()); } public static void main(String[] args) { Class c = null; try { c = Class.forName("typeinfo.toys.FancyToy"); } catch(ClassNotFoundException e) { System.out.println("Can't find FancyToy"); System.exit(1); } printInfo(c); for(Class face : c.getInterfaces()) printInfo(face); Class up = c.getSuperclass(); Object obj = null; try { // Requires no-arg constructor: obj = up.newInstance(); } catch(InstantiationException e) { System.out.println("Cannot instantiate"); System.exit(1); } catch(IllegalAccessException e) { System.out.println("Cannot access"); System.exit(1); } printInfo(obj.getClass()); } } /* Output: Class name: typeinfo.toys.FancyToy is interface? [false] Simple name: FancyToy Canonical name : typeinfo.toys.FancyToy Class name: typeinfo.toys.HasBatteries is interface? [true] Simple name: HasBatteries Canonical name : typeinfo.toys.HasBatteries Class name: typeinfo.toys.Waterproof is interface? [true] Simple name: Waterproof Canonical name : typeinfo.toys.Waterproof Class name: typeinfo.toys.Shoots is interface? [true] Simple name: Shoots Canonical name : typeinfo.toys.Shoots Class name: typeinfo.toys.Toy is interface? [false] Simple name: Toy Canonical name : typeinfo.toys.Toy */