Here you can find the source of setField(Object obj, Class fieldOwner, String fieldName, Object value)
private static void setField(Object obj, Class<?> fieldOwner, String fieldName, Object value)
//package com.java2s; /*//from www . ja v a2s. c o m * The MIT License * * Copyright 2014 Karol Bucek. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ import java.lang.reflect.Field; public class Main { private static void setField(Object obj, Class<?> fieldOwner, String fieldName, Object value) { final Field field; try { field = fieldOwner.getDeclaredField(fieldName); field.setAccessible(true); field.set(obj, value); } catch (NoSuchFieldException e) { throw new IllegalStateException("no field '" + fieldName + "' declared in " + fieldOwner + "", e); } catch (IllegalAccessException e) { throw new IllegalStateException(e); } } }