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

Description

set Field

License

Apache License

Declaration

private static void setField(Class clazz, Object instance, String fieldName, Object value) 

Method Source Code

//package com.java2s;
/*/*from   w  ww  .  ja va 2s  .c  o m*/
 * Copyright 2013 Klarna AB
 *
 * 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 {
    public static void setField(Object instance, String fieldName, Object value) {
        setField(instance.getClass(), instance, fieldName, value);
    }

    private static void setField(Class clazz, Object instance, String fieldName, Object value) {
        try {
            Field field = clazz.getDeclaredField(fieldName);
            boolean accessible = field.isAccessible();
            field.setAccessible(true);
            field.set(instance, value);
            field.setAccessible(accessible);
        } catch (NoSuchFieldException e) {
            throw new IllegalArgumentException(
                    "Failed to set field '" + fieldName + "' on '" + instance + "': " + e.getMessage(), e);
        } catch (IllegalAccessException e) {
            throw new IllegalStateException(
                    "Failed to set field '" + fieldName + "' on '" + instance + "': " + e.getMessage(), e);
        }
    }
}

Related

1. setField(Class clazz, Object src, String fieldName, Object value)
2. setField(Class clazz, String name, Object value)
3. setField(Class cls, Object obj, String fieldName, Object value)
4. setField(Class type, String name, Object instance, Object value)