Examples of java.lang.reflect.Method.invoke()

java.lang.reflect.Method.invoke()
Invokes the underlying method represented by this Method object, on the specified object with the specified parameters. Individual parameters are automatically unwrapped to match primitive formal parameters, and both primitive and reference parameters are subject to method invocation conversions as necessary.
If the underlying method is static, then the specified obj argument is ignored. It may be null.
If the number of formal parameters required by the underlying method is 0, the supplied args array may be of length 0 or null.
If the underlying method is an instance method, it is invoked using dynamic method lookup as documented in The Java Language Specification, Second Edition, section 15.12.4.4; in particular, overriding based on the runtime type of the target object will occur.
If the underlying method is static, the class that declared the method is initialized if it has not already been initialized.
If the method completes normally, the value it returns is returned to the caller of invoke; if the value has a primitive type, it is first appropriately wrapped in an object. However, if the value has the type of an array of a primitive type, the elements of the array are not wrapped in objects; in other words, an array of primitive type is returned. If the underlying method return type is void, the invocation returns null. @param obj the object the underlying method is invoked from @param args the arguments used for the method call @return the result of dispatching the method represented bythis object on obj with parameters args @exception IllegalAccessException if this Method objectenforces Java language access control and the underlying method is inaccessible. @exception IllegalArgumentException if the method is aninstance method and the specified object argument is not an instance of the class or interface declaring the underlying method (or of a subclass or implementor thereof); if the number of actual and formal parameters differ; if an unwrapping conversion for primitive arguments fails; or if, after possible unwrapping, a parameter value cannot be converted to the corresponding formal parameter type by a method invocation conversion. @exception InvocationTargetException if the underlying methodthrows an exception. @exception NullPointerException if the specified object is nulland the method is an instance method. @exception ExceptionInInitializerError if the initializationprovoked by this method fails.

  public static SocketFactory getFactory(String sfcn) {
    SocketFactory socketFactory = null;
    try {
      Class factoryClass = Class.forName(sfcn);
      Method method = factoryClass.getMethod("getFactory", (Class[]) null);
      socketFactory = (SocketFactory) method.invoke(null, (Object[]) null);
    } catch (Exception exc) {
      logger.log(BasicLevel.ERROR,
                 "Use default SocketFactory, unable to instantiate : " + sfcn, exc);
      socketFactory = getDefaultFactory();
    }

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          // continue
        }
      }
      if (clazz != null) {
        Method method = clazz.getMethod("getFactory", (Class[]) null);
        factory = (SocketFactory) method.invoke(null, (Object[]) null);
      } else {
        throw new Exception("Socket factory class not found");
      }
    }
    return factory;

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   private Object getValue(Object bean, Field field) throws Exception
   {
      Class clazz = bean.getClass();
      Method method = getMethod("get", field, clazz);
      if (method != null)
         return method.invoke(bean, new Object[]{});
      method = getMethod("is", field, clazz);
      if (method != null)
         return method.invoke(bean, new Object[]{});
      field.setAccessible(true);
      return field.get(bean);

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      Method method = getMethod("get", field, clazz);
      if (method != null)
         return method.invoke(bean, new Object[]{});
      method = getMethod("is", field, clazz);
      if (method != null)
         return method.invoke(bean, new Object[]{});
      field.setAccessible(true);
      return field.get(bean);
   }


   private Method getMethod(String prefix, Field field, Class clazz) throws Exception

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            byte[].class,
            Integer.TYPE,
            Integer.TYPE
          });


          method.invoke(null, new Object[] {
            dest,
            new Integer(src),
            new Integer(size)
          });
          memmove_type = 1;

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            byte[].class,
            Integer.TYPE,
            Integer.TYPE
          });


          method.invoke(null, new Object[] {
            dest,
            new Integer(src),
            new Integer(size)
          });

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          signature[i] = boolean.class;
        else
          signature[i] = thisClass;
      }
      Method method = clazz.getMethod(methodName, signature);
      return method.invoke(target, args);
    } catch (Exception e) {
      throw new IllegalStateException(e);
    }
  }

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  private static Object invoke(Class<?> clazz, Object target,
      String methodName, Class<?>[] signature, Object[] args) {
    try {
      Method method = clazz.getDeclaredMethod(methodName, signature);
      method.setAccessible(true);
      return method.invoke(target, args);
    } catch (Exception e) {
      throw new IllegalStateException(e);
    }
  }

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            }
        }
        Method method = primeClass.getDeclaredMethod(methodName, classTypes);
        method.setAccessible(true);


        return method.invoke(method, args);
    }


    /**
     * Calls a static method with the given class and the given arguments.
     * use this method when the specified arguments includes null object.

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        Class primeClass = Class.forName(className);
        Method method = primeClass.getDeclaredMethod(methodName, classTypes);
        method.setAccessible(true);


        return method.invoke(method, objects);
    }
}

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