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| 1 | +/* | |
| 2 | + * Copyright (c) 1994, 2005, 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</code> 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</code>. | |
| 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</code> is implemented by class <code>Thread</code>. | |
| 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</code> provides the means for a class to be | |
| 40 | + * active while not subclassing <code>Thread</code>. A class that implements | |
| 41 | + * <code>Runnable</code> can run without subclassing <code>Thread</code> | |
| 42 | + * by instantiating a <code>Thread</code> instance and passing itself in | |
| 43 | + * as the target. In most cases, the <code>Runnable</code> interface should | |
| 44 | + * be used if you are only planning to override the <code>run()</code> | |
| 45 | + * method and no other <code>Thread</code> 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 JDK1.0 | |
| 54 | + */ | |
| 55 | +public | |
| 56 | +interface Runnable { | |
| 57 | + /** | |
| 58 | + * When an object implementing interface <code>Runnable</code> is used | |
| 59 | + * to create a thread, starting the thread causes the object's | |
| 60 | + * <code>run</code> method to be called in that separately executing | |
| 61 | + * thread. | |
| 62 | + * <p> | |
| 63 | + * The general contract of the method <code>run</code> is that it may | |
| 64 | + * take any action whatsoever. | |
| 65 | + * | |
| 66 | + * @see java.lang.Thread#run() | |
| 67 | + */ | |
| 68 | + public abstract void run(); | |
| 69 | +} | |