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package java.lang;
/**
* The {@code 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 {@code run}.
* <p>
* This interface is designed to provide a common protocol for objects that
* wish to execute code while they are active. For example,
* {@code Runnable} is implemented by class {@code Thread}.
* Being active simply means that a thread has been started and has not
* yet been stopped.
* In addition, {@code Runnable} provides the means for a class to be
* active while not subclassing {@code Thread}. A class that implements
* {@code Runnable} can run without subclassing {@code Thread}
* by instantiating a {@code Thread} instance and passing itself in
* as the target. In most cases, the {@code Runnable} interface should
* be used if you are only planning to override the {@code run()}
* method and no other {@code 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.
* @author Arthur van Hoff
* @see java.lang.Thread
* @see java.util.concurrent.Callable
* @since 1.0
@FunctionalInterface
public interface Runnable {
* When an object implementing interface {@code Runnable} is used
* to create a thread, starting the thread causes the object's
* {@code run} method to be called in that separately executing
* thread.
* The general contract of the method {@code run} is that it may
* take any action whatsoever.
* @see java.lang.Thread#run()
public abstract void run();
}