Java Reflection Field Set setField(Field f, Object instance, Object value)

Description

set Field

License

Apache License

Declaration

public static void setField(Field f, Object instance, Object value) 

Method Source Code

//package com.java2s;
/**/*from  w  w w  .j  av a  2s .c o m*/
 *  Copyright 2005-2014 Red Hat, Inc.
 *
 *  Red Hat 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;

import java.lang.reflect.Modifier;

public class Main {
    public static void setField(Field f, Object instance, Object value) {
        try {
            boolean oldAccessible = f.isAccessible();
            boolean shouldSetAccessible = !Modifier.isPublic(f.getModifiers()) && !oldAccessible;
            if (shouldSetAccessible) {
                f.setAccessible(true);
            }
            f.set(instance, value);
            if (shouldSetAccessible) {
                f.setAccessible(oldAccessible);
            }
        } catch (Exception ex) {
            throw new UnsupportedOperationException(
                    "Cannot inject value of class: " + value.getClass() + " into: " + f);
        }
    }
}

Related

1. setField(Class clazz, Object obj, String fieldName, Object value)
2. setField(Class ownerClass, Object owner, String fieldName, Object newValue)
3. setField(Class target, Class fieldType, int index, Object obj, Object value)
4. setField(Class clazz, T instance, String fieldName, Object value)
5. setField(Class clazz, T instance, String fieldName, Object value)
6. setField(Field f, Object this_, Object value)
7. setField(Field field, @Nullable Object instance, Object thing)
8. setField(Field field, Object classWithField, Object value)
9. setField(Field field, Object instance, Object value)