- All Known Subinterfaces:
RunnableFuture<V>
,RunnableScheduledFuture<V>
- All Known Implementing Classes:
AsyncBoxView.ChildState
,ForkJoinWorkerThread
,FutureTask
,RenderableImageProducer
,SwingWorker
,Thread
,TimerTask
- Functional Interface:
- This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
@FunctionalInterface public interface Runnable
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
.
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.
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.
-
Method Summary
Modifier and TypeMethodDescriptionvoid
run()
When an object implementing interfaceRunnable
is used to create a thread, starting the thread causes the object'srun
method to be called in that separately executing thread.
-
Method Details
-
run
void run()When an object implementing interfaceRunnable
is used to create a thread, starting the thread causes the object'srun
method to be called in that separately executing thread.The general contract of the method
run
is that it may take any action whatsoever.- See Also:
Thread.run()
-