Here you can find the source of setField(Object object, String fieldName, Object value)
| Parameter | Description |
|---|---|
| object | the object |
| fieldName | the field name |
| value | the value to set |
public static void setField(Object object, String fieldName, Object value)
//package com.java2s; /*//from ww w. ja v a 2 s .co m * Copyright Ericsson AB 2011-2014. All Rights Reserved. * * The contents of this file are subject to the Lesser GNU Public License, * (the "License"), either version 2.1 of the License, or * (at your option) any later version.; you may not use this file except in * compliance with the License. You should have received a copy of the * License along with this software. If not, it can be * retrieved online at https://www.gnu.org/licenses/lgpl.html. Moreover * it could also be requested from Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO * WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. * EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR * OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY KIND, * EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE * LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, * YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. * * IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING * WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR * REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR * DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL * DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE LIBRARY * (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED * INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE * OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH * HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * */ import java.lang.reflect.Field; public class Main { /** * Set the field value of the field with the given name of the specified * object. If the object is a class, then it is assumed to be a static * field. * * @param object the object * @param fieldName the field name * @param value the value to set */ public static void setField(Object object, String fieldName, Object value) { try { Field field; if (object instanceof Class) { field = findField((Class) object, fieldName, null); object = null; } else { field = findField(object.getClass(), fieldName, null); } field.setAccessible(true); field.set(object, value); } catch (IllegalAccessException | IllegalArgumentException | SecurityException e) { throw new Error(e); } } /** * Attempt to find a {@link Field field} on the supplied {@link Class} with * the supplied <code>name</code> and/or {@link Class type}. Searches all * superclasses up to {@link Object}. * * @param clazz the class to introspect * @param name the name of the field (may be <code>null</code> if type is * specified) * @param type the type of the field (may be <code>null</code> if name is * specified) * * @return the corresponding Field object, or <code>null</code> if not found */ private static Field findField(Class<?> clazz, String name, Class<?> type) { Class<?> searchType = clazz; while (!Object.class.equals(searchType) && searchType != null) { Field[] fields = searchType.getDeclaredFields(); for (Field field : fields) { if ((name == null || name.equals(field.getName())) && (type == null || type.equals(field.getType()))) { return field; } } searchType = searchType.getSuperclass(); } return null; } }