1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. Oracle designates this 9 * particular file as subject to the "Classpath" exception as provided 10 * by Oracle in the LICENSE file that accompanied this code. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 23 * or visit www.oracle.com if you need additional information or have any 24 * questions. 25 */ 26 27 package java.lang; 28 29 import java.lang.reflect.Method; 30 import libcore.util.EmptyArray; 31 32 /** 33 * The {@code Void} class is an uninstantiable placeholder class to hold a 34 * reference to the {@code Class} object representing the Java keyword 35 * void. 36 * 37 * @author unascribed 38 * @since JDK1.1 39 */ 40 public final 41 class Void { 42 43 /** 44 * The {@code Class} object representing the pseudo-type corresponding to 45 * the keyword {@code void}. 46 */ 47 public static final Class<Void> TYPE = lookupType(); 48 49 @SuppressWarnings("unchecked") lookupType()50 private static Class<Void> lookupType() { 51 try { 52 Method method = Runnable.class.getMethod("run", EmptyArray.CLASS); 53 return (Class<Void>) method.getReturnType(); 54 } catch (Exception e) { 55 throw new AssertionError(e); 56 } 57 } 58 59 /* 60 * The Void class cannot be instantiated. 61 */ Void()62 private Void() {} 63 } 64