interface Runnable

 1 package java.lang;
 2 
 3 /**
   Runnable接口应该被要通过thread来执行的类实例来实现
   这个类必须定义一个没有参数的run方法
 4  * The <code>Runnable</code> interface should be implemented by any
 5  * class whose instances are intended to be executed by a thread. The
 6  * class must define a method of no arguments called <code>run</code>.
 7  * <p>
　　
　　此接口旨在为希望在活动时执行代码的对象提供通用协议。
　　例如，<code>runnable</code>由类<code>thread</code>实现。
　　处于活动状态只意味着线程已启动但尚未停止。
 8  * This interface is designed to provide a common protocol for objects that
 9  * wish to execute code while they are active. For example,
10  * <code>Runnable</code> is implemented by class <code>Thread</code>.
11  * Being active simply means that a thread has been started and has not
12  * yet been stopped.
13  * <p>
　　
　　此外，Runnable 提供了使类不需要继承Thread也可处于活动状态的方法
14  * In addition, <code>Runnable</code> provides the means for a class to be
15  * active while not subclassing <code>Thread</code>. 
　　
　　实现 Runnable 的类可以在不继承Thread类的情况下运行
　　通过实例化一个<code>线程<code>实例并将其自身作为目标传入。
　　A class that implements
16  * <code>Runnable</code> can run without subclassing <code>Thread</code>
17  * by instantiating a <code>Thread</code> instance and passing itself in
18  * as the target.  
　　
　　在大多数情况下，如果您只计划重写<code>run（）</code>方法，而不打算重写其他<code>thread</code>方法，则应使用<code>runnable</code>接口。
　　In most cases, the <code>Runnable</code> interface should
19  * be used if you are only planning to override the <code>run()</code>
20  * method and no other <code>Thread</code> methods.

　　这一点很重要，因为除非程序员打算修改或增强类的基本行为，否则不应该对类进行子类化。
21  * This is important because classes should not be subclassed
22  * unless the programmer intends on modifying or enhancing the fundamental
23  * behavior of the class.
24  *
25  * @author  Arthur van Hoff
26  * @see     java.lang.Thread
27  * @see     java.util.concurrent.Callable
28  * @since   JDK1.0
29  */
30 @FunctionalInterface
31 public interface Runnable {
32     /**
　　　　　　当对象实现Runnable接口被用来创建一个线程时，启动这个线程会导致对象的run方法在单独执行的线程中被调用
33      * When an object implementing interface <code>Runnable</code> is used
34      * to create a thread, starting the thread causes the object's
35      * <code>run</code> method to be called in that separately executing
36      * thread.
37      * <p>

　　　　　　方法run的一般约定是它可以采取任何操作。
38      * The general contract of the method <code>run</code> is that it may
39      * take any action whatsoever.
40      *
41      * @see     java.lang.Thread#run()
42      */
43     public abstract void run();
44 }