Here you can find the source of as(Object obj)
@SuppressWarnings("unchecked") public static <T> T as(Object obj)
//package com.java2s; /******************************************************************************* * Copyright (C) 2011 Harry Blauberg/*from ww w . j a va 2 s. c o m*/ * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation, either version 3 of * the License, or (at your option) any later version. * * This program 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program. If not, see <http://www.gnu.org/licenses/>. ******************************************************************************/ public class Main { @SuppressWarnings("unchecked") public static <T> T as(Object obj) { T result; try { result = obj == null ? null : (T) obj; } catch (ClassCastException cce) { result = null; } return result; } }