1 /*
 2  * Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.  Oracle designates this
 8  * particular file as subject to the "Classpath" exception as provided
 9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 
26 package java.lang;
27 
28 /**
29  * The {@code Runnable} interface should be implemented by any
30  * class whose instances are intended to be executed by a thread. The
31  * class must define a method of no arguments called {@code run}.
32  * <p>
33  * This interface is designed to provide a common protocol for objects that
34  * wish to execute code while they are active. For example,
35  * {@code Runnable} is implemented by class {@code Thread}.
36  * Being active simply means that a thread has been started and has not
37  * yet been stopped.
38  * <p>
39  * In addition, {@code Runnable} provides the means for a class to be
40  * active while not subclassing {@code Thread}. A class that implements
41  * {@code Runnable} can run without subclassing {@code Thread}
42  * by instantiating a {@code Thread} instance and passing itself in
43  * as the target.  In most cases, the {@code Runnable} interface should
44  * be used if you are only planning to override the {@code run()}
45  * method and no other {@code Thread} methods.
46  * This is important because classes should not be subclassed
47  * unless the programmer intends on modifying or enhancing the fundamental
48  * behavior of the class.
49  *
50  * @author  Arthur van Hoff
51  * @see     java.lang.Thread
52  * @see     java.util.concurrent.Callable
53  * @since   1.0
54  */
55 @FunctionalInterface
56 public interface Runnable {
57     /**
58      * When an object implementing interface {@code Runnable} is used
59      * to create a thread, starting the thread causes the object's
60      * {@code run} method to be called in that separately executing
61      * thread.
62      * <p>
63      * The general contract of the method {@code run} is that it may
64      * take any action whatsoever.


65      */
66     public abstract void run();
67 }
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