1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package java.lang; 19 20 import java.lang.reflect.Method; 21 import libcore.util.EmptyArray; 22 23 /** 24 * Placeholder class for the Java keyword {@code void}. 25 * 26 * @since 1.1 27 */ 28 public final class Void { 29 30 /** 31 * The {@link Class} object that represents the primitive type {@code void}. 32 */ 33 public static final Class<Void> TYPE = lookupType(); 34 // Note: Void.TYPE can't be set to "void.class", since *that* is 35 // defined to be "java.lang.Void.TYPE"; 36 37 @SuppressWarnings("unchecked") 38 private static Class<Void> lookupType() { 39 try { 40 Method method = Runnable.class.getMethod("run", EmptyArray.CLASS); 41 return (Class<Void>) method.getReturnType(); 42 } catch (Exception e) { 43 throw new AssertionError(e); 44 } 45 } 46 47 private Void() { 48 } 49 } 50
