Runnable接口的源碼閱讀

/*
 * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 */

package java.lang;

/**
 * The <code>Runnable</code> interface should be implemented by any
 * class whose instances are intended to be executed by a thread. The
 * class must define a method of no arguments called <code>run</code>.
 * <p>
任意但願其實例經過線程執行的類都須要實現Runnable接口.這些類必須定義一個無參數的run方法
 * This interface is designed to provide a common protocol for objects that
 * wish to execute code while they are active. For example,
 * <code>Runnable</code> is implemented by class <code>Thread</code>.
 * Being active simply means that a thread has been started and has not
 * yet been stopped.
此接口旨在爲但願在存活時執行代碼的對象提供公共接口.
例如，Runnable被Thread類所實現.存活僅僅意味着線程已經啓動了而且尚未被終止.
 * <p>
 * In addition, <code>Runnable</code> provides the means for a class to be
 * active while not subclassing <code>Thread</code>. A class that implements
 * <code>Runnable</code> can run without subclassing <code>Thread</code>
 * by instantiating a <code>Thread</code> instance and passing itself in
 * as the target.  In most cases, the <code>Runnable</code> interface should
 * be used if you are only planning to override the <code>run()</code>
 * method and no other <code>Thread</code> methods.

　　此外，Runnable爲不繼承Thread的類提供了可用的方法。
　　一個實現了Runnable接口的類能夠無需成爲Thread的子類而是建立一個Thread並將自身做爲參數傳遞進去的方式被實例化.

　　在大多數狀況下，Runnable接口應當用在你只計劃重寫run方法，並不許備使用其餘Thread的方法時

　　(由於Runnable只是一個接口，只有一個抽象的run()，Thread是實現類，有更多其餘的方法可被調用)

 * This is important because classes should not be subclassed
 * unless the programmer intends on modifying or enhancing the fundamental
 * behavior of the class.
 *
 這很重要，由於類不該該被子類化除非程序員打算修改或加強基礎類的行爲.
 * @author  Arthur van Hoff
 * @see     java.lang.Thread
 * @see     java.util.concurrent.Callable
 * @since   JDK1.0
 */
@FunctionalInterface
public interface Runnable {
    /**
     * When an object implementing interface <code>Runnable</code> is used
     * to create a thread, starting the thread causes the object's
     * <code>run</code> method to be called in that separately executing
     * thread.
　當一個對象實現了Runnable接口用於建立線程、啓動線程致使對象的run方法在單獨執行的線程中被調用
     * <p>
     * The general contract of the method <code>run</code> is that it may
     * take any action whatsoever.
     *

　　run方法的通俗約定是能夠作任何行爲.

* @see     java.lang.Thread#run()     */    public abstract void run();}