Java Code:
import java.awt.Rectangle;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

public class SampleInstance {

  public static void main(String[] args) {

    Rectangle rectangle;
    Class rectangleDefinition;
    Class[] intArgsClass = new Class[] { int.class, int.class };
    Integer height = new Integer(12);
    Integer width = new Integer(34);
    Object[] intArgs = new Object[] { height, width };
    Constructor intArgsConstructor;

    try {
      rectangleDefinition = Class.forName("java.awt.Rectangle");
      intArgsConstructor = rectangleDefinition
          .getConstructor(intArgsClass);
      rectangle = (Rectangle) createObject(intArgsConstructor, intArgs);
    } catch (ClassNotFoundException e) {
      System.out.println(e);
    } catch (NoSuchMethodException e) {
      System.out.println(e);
    }
  }

  public static Object createObject(Constructor constructor,
      Object[] arguments) {

    System.out.println("Constructor: " + constructor.toString());
    Object object = null;

    try {
      object = constructor.newInstance(arguments);
      System.out.println("Object: " + object.toString());
      return object;
    } catch (InstantiationException e) {
      System.out.println(e);
    } catch (IllegalAccessException e) {
      System.out.println(e);
    } catch (IllegalArgumentException e) {
      System.out.println(e);
    } catch (InvocationTargetException e) {
      System.out.println(e);
    }
    return object;
  }
}