public class Main {

  static class A {
    public Integer a() { return 1; }
  }

  public static void main(String[] args) throws Exception {
    doRegular();
    doReflection2();
    doReflection();
  }

  public static void doRegular() throws Exception {
    A a = new A();
    long start = System.currentTimeMillis();
    for (int i=0; i<10000000; i++) {
      a.a();
    }
    System.out.println(System.currentTimeMillis() - start);
  }

  public static void doReflection() throws Exception {
    A a = new A();
    long start = System.currentTimeMillis();
    for (int i=0; i<10000000; i++) {
      A.class.getMethod("a").invoke(a);
    }
    System.out.println(System.currentTimeMillis() - start);
  }

  public static void doReflection2() throws Exception {
    A a = new A();
    java.lang.reflect.Method method = A.class.getMethod("a");
    long start = System.currentTimeMillis();
    for (int i=0; i<10000000; i++) {
      method.invoke(a);
    }
    System.out.println(System.currentTimeMillis() - start);
  }
}