java的rtti机制语法[Java编程]

//: ToyTest.java
// Testing class Class

interface HasBatteries {}
interface Waterproof {}
interface ShootsThings {}
class Toy {
  // Comment out the following default
  // constructor to see 
  // NoSuchMethodError from (*1*)
  Toy() {} 
  Toy(int i) {} 
}

class FancyToy extends Toy 
    implements HasBatteries, 
      Waterproof, ShootsThings {
  FancyToy() { super(1); }
}

public class ToyTest {
  public static void main(String[] args) {
    Class c = null;
    try {
      c = Class.forName("FancyToy");
    } catch(ClassNotFoundException e) {}
    printInfo(c);
    Class[] faces = c.getInterfaces();
    for(int i = 0; i < faces.length; i++)
      printInfo(faces[i]);
    Class cy = c.getSuperclass();
    Object o = null;
    try {
      // Requires default constructor:
      o = cy.newInstance(); // (*1*)
    } catch(InstantiationException e) {}
      catch(IllegalAccessException e) {}
    printInfo(o.getClass());
  }
  static void printInfo(Class cc) {
    System.out.println(
      "Class name: " + cc.getName() +
      " is interface? [" +
      cc.isInterface() + "]");
  }
} ///:~

Class name: FancyToy is interface? [false]
Class name: HasBatteries is interface? [true]
Class name: Waterproof is interface? [true]
Class name: ShootsThings is interface? [true]
Class name: Toy is interface? [false]