Java Reflection Method Invoke invokeMethod(Class clazz, Object obj, String methodName, Class[] parametersTypes, Object[] parameters)

Description

Invokes specified method using reflection and returns result.

License

Open Source License

Parameter

Parameter	Description
clazz	Class, which method will be get by name.
obj	Object, which method will be invoked.
methodName	Name of method, that will be invoked.
parametersTypes	Array of parameter types, used for getting method.
parameters	Array with arguments, that will be passed to method.

Exception

Parameter	Description
Exception	To JUnit.

Return

Result of method invoking.

Declaration

public static Object invokeMethod(Class clazz, Object obj, String methodName, Class[] parametersTypes,
        Object[] parameters) throws Exception 

Method Source Code

//package com.java2s;

import java.lang.reflect.Method;

public class Main {
    /**/*from  w  ww  . j a v  a  2s.  c  o  m*/
     * Invokes specified method using reflection and returns result. Here, necessary method will be get from
     * specified class: clazz.getDeclaredMethod().
     *
     * @param clazz Class, which method will be get by name.
     * @param obj Object, which method will be invoked.
     * @param methodName Name of method, that will be invoked.
     * @param parametersTypes Array of parameter types, used for getting method.
     * @param parameters Array with arguments, that will be passed to method.
     * @return Result of method invoking.
     * @throws Exception To JUnit.
     */
    public static Object invokeMethod(Class clazz, Object obj, String methodName, Class[] parametersTypes,
            Object[] parameters) throws Exception {
        Method method = clazz.getDeclaredMethod(methodName, parametersTypes);
        method.setAccessible(true);
        return method.invoke(obj, parameters);
    }

    /**
     * Invokes specified method using reflection and returns result. Here, necessary method will be get using
     * object's class: obj.getClass().getDeclaredMethod().
     *
     * @param obj Object, which method will be invoked.
     * @param methodName Name of method, that will be invoked.
     * @param parametersTypes Array of parameter types, used for getting method.
     * @param parameters Array with arguments, that will be passed to method.
     * @return Result of method invoking.
     * @throws Exception To JUnit.
     */
    public static Object invokeMethod(Object obj, String methodName, Class[] parametersTypes, Object[] parameters)
            throws Exception {
        return invokeMethod(obj.getClass(), obj, methodName, parametersTypes, parameters);
    }
}

Related

1. invoke(Method method, T instance, Object... params)
2. invoke(MethodHandle methodHandle, Object... params)
3. invokeJdbcMethod(Method method, Object target)
4. invokeJdbcMethod(Method method, Object target)
5. invokeMethod(Class clazz, Object classObject, String methodName, Class[] paramTypes, Object... args)
6. invokeMethod(Class clazz, String methodName, Object[] args)
7. invokeMethod(Class targetClass, Object obj, String methodName, Object arg)
8. invokeMethod(Class clazz, E instance, String[] names, Object... args)
9. invokeMethod(Class clazz, Object object, String methodName, Class[] parameterTypes, Object[] parameters)