Here you can find the source of setFieldObject(Class> clazz, String field, Object object, Object newObj)
public static void setFieldObject(Class<?> clazz, String field, Object object, Object newObj)
//package com.java2s; /**/*from w w w .ja va2s . c o m*/ * * This software is part of the MaterialAPI * * This api allows plugin developers to create on a easy way custom * items with a custom id and recipes depending on them. * * MaterialAPI is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * any later version. * * MaterialAPI is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with MaterialAPI. If not, see <http://www.gnu.org/licenses/>. * */ import java.lang.reflect.Field; public class Main { public static void setFieldObject(Class<?> clazz, String field, Object object, Object newObj) { try { Field f = clazz.getDeclaredField(field); f.setAccessible(true); f.set(object, newObj); } catch (Exception ex) { } } }