Java Reflection Method Invoke invokeMethod(Object target, String name, Class... parameterTypes)

Description

Safely invoke a method with the given signature (name + parameter types) on the given target object.

License

Apache License

Parameter

Parameter	Description
target	the target object
name	method name
parameterTypes	method's parameters types.

Return

the value returned by the method invocation.

Declaration

public static <T> T invokeMethod(Object target, String name, Class<?>... parameterTypes) 

Method Source Code

//package com.java2s;
/**//from w  w w  .j a va 2s . c  o  m
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.Method;

public class Main {
    /**
     * Safely invoke a method with the given signature (name + parameter types) on the given target object.
     *
     * @param target
     *          the target object
     * @param name
     *          method name
     * @param parameterTypes
     *          method's parameters types.
     * @return
     *          the value returned by the method invocation.
     */
    public static <T> T invokeMethod(Object target, String name, Class<?>... parameterTypes) {
        Method method = findMethod(target.getClass(), name, parameterTypes);

        try {
            return (T) method.invoke(target, parameterTypes);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * Safely search for a method with a given signature (name + parameter types) on a given class.
     *
     * @param clazz
     *          the target class
     * @param name
     *          method name
     * @param parameterTypes
     *          method's parameters types.
     * @return
     *         the method corresponding to the given signature, null if such a method doesn't exist.
     */
    public static Method findMethod(Class<?> clazz, String name, Class<?>... parameterTypes) {
        try {
            Method method = clazz.getMethod(name, parameterTypes);
            return method;
        } catch (Exception e) {
            return null;
        }
    }
}

Related

1. invokeMethod(Object target, Method method, Object... args)
2. invokeMethod(Object target, Method method, Object[] args)
3. invokeMethod(Object target, String method)
4. invokeMethod(Object target, String methodName, Object... parameters)
5. invokeMethod(Object target, String methodName, Object[] arguments)
6. invokeMethod(Object target, String name, Object[] args, Class[] argTypes)
7. invokeMethod(Object target, String signature, Object... args)
8. invokeMethod(Object target, String thisMethod, Object value)
9. invokeMethod(Object theObject, String methodName, Object... parametersObject)