Java Reflection Field Set setField(Class clazz, String name, Object value)

Description

Assigns a value to a field of a given class.

License

Open Source License

Parameter

Parameter	Description
clazz	The class.
name	The name of the field.
value	The new value of the field.

Declaration

public static void setField(Class clazz, String name, Object value) 

Method Source Code

//package com.java2s;
/*// w  w  w  .  java 2 s  . co m
 * Copyright 2017, Leanplum, Inc. All rights reserved.
 *
 * 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.Field;

public class Main {
    /**
     * Assigns a value to a field of a given class.
     *
     * @param clazz The class.
     * @param name The name of the field.
     * @param value The new value of the field.
     */
    public static void setField(Class clazz, String name, Object value) {
        setField(clazz, null, name, value);
    }

    /**
     * Assigns a value to a field of a given object.
     *
     * @param object The object.
     * @param name The name of the field.
     * @param value The new value of the field.
     */
    @SuppressWarnings("unused")
    public static void setField(Object object, String name, Object value) {
        setField(null, object, name, value);
    }

    /**
     * Assigns a value to a field of a given class or object.
     *
     * @param clazz The class.
     * @param object The object.
     * @param name The name of the field.
     * @param value The new value of the field.
     */
    public static void setField(Class clazz, Object object, String name, Object value) {
        if (clazz == null && object == null) {
            return;
        }
        if (clazz == null) {
            clazz = object.getClass();
        }
        try {
            Field field = clazz.getDeclaredField(name);
            try {
                field.setAccessible(true);
                field.set(object, value);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
    }
}

Related

1. setField(Class clazz, Object instance, String fieldName, Object value)
2. setField(Class clazz, Object src, String fieldName, Object value)
3. setField(Class cls, Object obj, String fieldName, Object value)
4. setField(Class type, String name, Object instance, Object value)
5. setField(Class klazz, Object recipient, String fieldName, Object newValue)
6. setField(Class clazz, String fieldName, T instance, Object value)