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
18package java.lang;
19
20import java.lang.reflect.Method;
21import libcore.util.EmptyArray;
22
23/**
24 * Placeholder class for the Java keyword {@code void}.
25 *
26 * @since 1.1
27 */
28public 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