Java Reflection Field Value Set setFieldValue(final Class clazz, final String fieldName, final Object fieldValue)

Description

Sets a new value of a static field.

License

Open Source License

Parameter

Parameter	Description
clazz	the class thats static field value has to be set
fieldName	the name of the static field
fieldValue	the new value to be set

Exception

Parameter	Description
SecurityException	an exception
NoSuchFieldException	an exception
IllegalArgumentException	an exception
IllegalAccessException	an exception

Declaration

public static void setFieldValue(final Class<? extends Object> clazz, final String fieldName,
        final Object fieldValue)
        throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2012 SAP AG and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:/*from w ww . j av  a  2  s  .c om*/
 *     SAP AG - initial API and implementation
 *******************************************************************************/

import java.lang.reflect.Field;

public class Main {
    /**
     * Sets a new value of an instance field. This method doesn't only considers fields declared in the passed instance but also those declared in the
     * whole super-hierarchy of the instance.
     * 
     * @param instance
     *            the object thats field value has to be set
     * @param fieldName
     *            the name of the instance variable
     * @param fieldValue
     *            the new value to be set
     * @throws SecurityException
     * @throws NoSuchFieldException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    public static void setFieldValue(final Object instance, final String fieldName, final Object fieldValue)
            throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
        assert instance != null && fieldValue != null && fieldName != null;

        final Field field = getField(instance.getClass(), fieldName);
        field.setAccessible(true);
        field.set(instance, fieldValue);
    }

    /**
     * Sets a new value of a static field. This method doesn't only considers fields declared in the passed instance but also those declared in the
     * whole super-hierarchy of the instance.
     * 
     * @param clazz
     *            the class thats static field value has to be set
     * @param fieldName
     *            the name of the static field
     * @param fieldValue
     *            the new value to be set
     * @throws SecurityException
     * @throws NoSuchFieldException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    public static void setFieldValue(final Class<? extends Object> clazz, final String fieldName,
            final Object fieldValue)
            throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException {

        assert clazz != null && fieldName != null;

        final Field field = getField(clazz, fieldName);
        field.setAccessible(true);
        field.set(null, fieldValue);
    }

    private static Field getField(final Class<?> instanceClass, final String fieldName)
            throws NoSuchFieldException {
        assert fieldName != null;

        try {
            return instanceClass.getDeclaredField(fieldName);
        } catch (NoSuchFieldException e) {
            final Class<?> superClass = instanceClass.getSuperclass();
            if (superClass != null) {
                return getField(superClass, fieldName);
            }
            throw e;
        }
    }
}

Related

1. setFieldValue(Field field, Object object, Object value)
2. setFieldValue(Field field, Object object, Object value)
3. setFieldValue(Field field, Object target, Object value)
4. setFieldValue(Field field, Object value, Object instance)
5. setFieldValue(Field field, Object value, Object target)
6. setFieldValue(final Field field, final Object instance, final Object value)
7. setFieldValue(final Field field, final Object obj, final Object value)
8. setFieldValue(final Field field, final Object value, final Object object)
9. setFieldValue(final Object bean, final Field field, final Object value)