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

Description

Set the value of a field to value.

License

Apache License

Parameter

Parameter	Description
clazz	The class (or parent class) of object
obj	The object try to access
fieldName	The name of the field
value	New value for the field

Declaration

public static void setField(Class<?> clazz, Object obj, String fieldName, Object value) 

Method Source Code

//package com.java2s;
/*/*from   ww w . jav  a2s .  c om*/
 * Copyright (C) 2010 Fan Hongtao (http://www.fanhongtao.org)
 *
 * 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.Field;

public class Main {
    /**
     * Set the value of a field to <i>value</i>.
     * @param obj The object try to access
     * @param fieldName The name of the field
     * @param value New value for the field 
     */
    public static void setField(Object obj, String fieldName, Object value) {
        try {
            Field field = obj.getClass().getDeclaredField(fieldName);
            boolean oldAccess = field.isAccessible();
            field.setAccessible(true);
            field.set(obj, value);
            field.setAccessible(oldAccess);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Set the value of a field to <i>value</i>.
     * @param clazz The class (or parent class) of object
     * @param obj The object try to access
     * @param fieldName The name of the field
     * @param value New value for the field 
     */
    public static void setField(Class<?> clazz, Object obj, String fieldName, Object value) {
        try {
            Field field = clazz.getDeclaredField(fieldName);
            boolean oldAccess = field.isAccessible();
            field.setAccessible(true);
            field.set(obj, value);
            field.setAccessible(oldAccess);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Related

1. setField(Class klazz, Object recipient, String fieldName, Object newValue)
2. setField(Class clazz, String fieldName, T instance, Object value)
3. setField(Class c, Object inst, String name, Object value)
4. setField(Class cl, String name, Object obj, Object value)
5. setField(Class clazz, Object instance, String field, Object value)
6. setField(Class ownerClass, Object owner, String fieldName, Object newValue)
7. setField(Class target, Class fieldType, int index, Object obj, Object value)
8. setField(Class clazz, T instance, String fieldName, Object value)
9. setField(Class clazz, T instance, String fieldName, Object value)