Java Method Call invoke(Object obj, String methodName, Object[] params)

Description

invoke

License

Open Source License

Declaration

public static Object invoke(Object obj, String methodName, Object[] params)
        throws InvocationTargetException, IllegalAccessException 

Method Source Code

//package com.java2s;
/*/*from ww w .  j  a  va 2s . co m*/
 * Copyright (c) 2005, Jeong-Ho Eun
 * All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 */

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

public class Main {

    public static Object invoke(Object obj, String methodName, Object[] params)
            throws InvocationTargetException, IllegalAccessException {
        try {
            Method[] methods = obj.getClass().getMethods();

            Method method = getMethod(methods, methodName);

            Object result = null;

            if (method != null) {
                result = method.invoke(obj, params);
            } else {
                throw new IllegalAccessException("Not exist the method. Method Name: [" + methodName + "]");
            }

            return result;
        } catch (InvocationTargetException e) {
            throw e;
        } catch (IllegalAccessException e) {
            throw e;
        }
    }

    public static Method getMethod(Method[] methods, String name) {
        Method method = null;
        for (int i = 0; i < methods.length; i++) {
            method = methods[i];
            if (!Modifier.isPublic(method.getModifiers()))
                continue;
            if (method.getName().equals(name))
                return method;
        }
        return null;
    }
}

Related

1. invoke(Object obj, String methodName, Class argType, Object arg)
2. invoke(Object obj, String methodName, Class clazz, Object newValue)
3. invoke(Object obj, String methodName, Class[] parameterTypes, Object[] args)
4. invoke(Object obj, String methodName, Object... args)
5. invoke(Object obj, String methodName, Object... params)
6. invoke(Object obj, String name, Object... args)
7. invoke(Object object, Method method)
8. invoke(Object object, Object[] args, String methodName)
9. invoke(Object object, String function, Object... params)