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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   }

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