Sample Test with annotations

MyTestAnnotation.java

@java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME)
@java.lang.annotation.Target({java.lang.annotation.ElementType.METHOD})
public @interface MyTestAnnotation {
}

SampleTest.java

package com.clouway.patterns.reflection;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * @ author Ivan Genchev ([email protected])
 */
public class SampleTest {

  public static class MyAnotherTest {
    @MyTestAnnotation
    public void testAddTwoNumbers() {

      System.out.println("Adding two numbers");

    }

    @MyTestAnnotation
    public void someMethod() {
      System.out.println("Some method");
    }
  }

  public static void main(String[] args) throws InstantiationException, IllegalAccessException {

   runTests(MyAnotherTest.class);

  }

  private static void runTests(Class<?> clazz) throws IllegalAccessException, InstantiationException {
    Method[] methods = clazz.getDeclaredMethods();

    Object o = clazz.newInstance();
    Object[] emptyArgs = {};

    for (Method each : methods) {

      if (each.isAnnotationPresent(MyTestAnnotation.class)) {

        // move to the next method in case when
        // method parameters are more then zero
        if (each.getParameterTypes().length != 0) {
          continue;
        }

        try {
          each.invoke(o, emptyArgs);
        } catch (InvocationTargetException e) {
          e.printStackTrace();
        }
      }

    }
  }

}