70 lines
2.9 KiB
Java
70 lines
2.9 KiB
Java
/*
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* Copyright (c) 1994, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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/**
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* The {@code Runnable} interface should be implemented by any
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* class whose instances are intended to be executed by a thread. The
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* class must define a method of no arguments called {@code run}.
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* <p>
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* This interface is designed to provide a common protocol for objects that
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* wish to execute code while they are active. For example,
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* {@code Runnable} is implemented by class {@code Thread}.
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* Being active simply means that a thread has been started and has not
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* yet been stopped.
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* <p>
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* In addition, {@code Runnable} provides the means for a class to be
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* active while not subclassing {@code Thread}. A class that implements
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* {@code Runnable} can run without subclassing {@code Thread}
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* by instantiating a {@code Thread} instance and passing itself in
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* as the target. In most cases, the {@code Runnable} interface should
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* be used if you are only planning to override the {@code run()}
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* method and no other {@code Thread} methods.
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* This is important because classes should not be subclassed
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* unless the programmer intends on modifying or enhancing the fundamental
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* behavior of the class.
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*
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* @author Arthur van Hoff
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* @see java.lang.Thread
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* @see java.util.concurrent.Callable
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* @since 1.0
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*/
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@FunctionalInterface
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public interface Runnable {
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/**
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* When an object implementing interface {@code Runnable} is used
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* to create a thread, starting the thread causes the object's
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* {@code run} method to be called in that separately executing
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* thread.
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* <p>
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* The general contract of the method {@code run} is that it may
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* take any action whatsoever.
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*
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* @see java.lang.Thread#run()
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*/
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public abstract void run();
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}
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