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    <p>Runnable isn't meant to be called directly by client code like <code>foo.run()</code> which would run sequentially in the current thread.</p> <p>From the <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Runnable.html" rel="nofollow noreferrer">Runnable API</a>:</p> <blockquote> <p>The Runnable 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 run.</p> <p>This interface is designed to provide a common protocol for objects that wish to execute code while they are active. For example, Runnable is implemented by class Thread. Being active simply means that a thread has been started and has not yet been stopped.</p> <p>In addition, Runnable provides the means for a class to be active while not subclassing Thread. A class that implements Runnable can run without subclassing Thread by instantiating a Thread instance and passing itself in as the target. In most cases, the Runnable interface should be used if you are only planning to override the run() method and no other Thread methods. This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class.</p> </blockquote> <p>Instead, you create a new Thread instance based on your runnable, and then call <code>bar.start()</code>. It is then the JVM's responsibility to call <code>run()</code> in this separate thread.</p> <p>Example:</p> <pre><code> public class Foo&lt;E&gt; implements Runnable { private final E e; public Foo(E e) { ... } @Override public void run() { do something with e. } } Foo&lt;String&gt; foo = new Foo("hello"); Thread bar = new Thread(foo); bar.start(); </code></pre>
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    1. CO`Runnable` has many usages outside of explicit threading. The semantics of the interface is just "an object that represents a piece of work to be run at some time".
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    2. CODisagree with your comment. See the API for its intended use.
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    3. COI agree with gustaf. If multithreading were the only intended purpose of Runnable, it'd be defined in java.util.concurrent, not java.lang. But more importantly, your statement that "Runnable isn't meant to be called directly by client code" is incorrect - if that were the case, the docs wouldn't suggest an implementation of `run()` that instantiates a thread and passes itself in. In that use case, if you're not calling `run()` directly, and not relying on an Executor to handle the threading (the Runnable is handling threading itself), how does it ever run? Simple - just call `run()`
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