Java Reflection Method Invoke invokeMethod(Object obj, String methodName, Object[] params, Class[] paramTypes)

Description

invoke Method

License

Open Source License

Declaration

public static Object invokeMethod(Object obj, String methodName, Object[] params, Class[] paramTypes)
            throws Throwable 

Method Source Code

//package com.java2s;
/*//  w  w  w .ja  v a2s  .  c om
 *  PHEX - The pure-java Gnutella-servent.
 *  Copyright (C) 2001 - 2005 Phex Development Group
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

import java.lang.reflect.*;

public class Main {
    public static Object invokeMethod(Object obj, String methodName, Object param) throws Throwable {
        Object[] params = { param };
        return invokeMethod(obj, methodName, params);
    }

    public static Object invokeMethod(Object obj, String methodName, Object[] params) throws Throwable {
        Class[] paramTypes = null;
        if (params != null) {
            paramTypes = new Class[params.length];
            for (int i = 0; i < params.length; i++) {
                paramTypes[i] = params[i].getClass();
            }
        }
        return invokeMethod(obj, methodName, params, paramTypes);
    }

    public static Object invokeMethod(Object obj, String methodName, Object[] params, Class[] paramTypes)
            throws Throwable {
        Class clazz;
        if (obj instanceof Class) {
            clazz = (Class) obj;
        } else {
            clazz = obj.getClass();
        }

        try {
            Method method = clazz.getDeclaredMethod(methodName, paramTypes);
            method.setAccessible(true);
            Object retVal = method.invoke(obj, params);
            return retVal;
        } catch (IllegalAccessException exp) {
            exp.printStackTrace();
            throw new RuntimeException(exp.getMessage());
        } catch (InvocationTargetException exp) {
            throw exp.getTargetException();
        } catch (NoSuchMethodException exp) {
            exp.printStackTrace();
            throw new RuntimeException(exp.getMessage());
        }
    }
}

Related

1. invokeMethod(Object obj, String method, Object... args)
2. invokeMethod(Object obj, String methodName, Object... args)
3. invokeMethod(Object obj, String methodName, Object... args)
4. invokeMethod(Object obj, String methodname, Object... args)
5. invokeMethod(Object obj, String methodName, Object... params)
6. invokeMethod(Object object, Method method, Object... args)
7. invokeMethod(Object object, String methodName, Class[] parameterTypes, Object[] parameters)
8. invokeMethod(Object object, String methodName, Class[] signature, Object[] parameters)
9. invokeMethod(Object object, String methodName, List argList)