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

Description

invoke

License

Apache License

Declaration

public static Object invoke(Object obj, String methodName, Object... params) 

Method Source Code

//package com.java2s;
/*// ww  w . j av  a 2  s .co m
 * Copyright 2008 Whohoo Licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable
 * law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */

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

public class Main {
    public static Object invoke(Object obj, String methodName, Object... params) {
        if (params.length % 2 != 0) {
            throw new RuntimeException("types and values mismatch");
        }
        try {
            int size = params.length / 2;
            Class<?>[] types = new Class<?>[size];
            Object[] args = new Object[size];
            for (int i = 0; i < types.length; i++) {
                int idx = (i * 2);
                types[i] = (Class<?>) params[idx];
                args[i] = params[idx + 1];
            }
            Method method = obj.getClass().getMethod(methodName, types);
            Object ret = method.invoke(obj, args);
            return ret;
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        } catch (SecurityException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        } catch (IllegalArgumentException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }
}

Related

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