Module java.base
Package java.lang

Interface Runnable

  • 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.
    @FunctionalInterfacepublic interfaceRunnable
    TheRunnable 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 calledrun.

    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 classThread. 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 subclassingThread. A class that implementsRunnable can run without subclassingThread by instantiating aThread instance and passing itself in as the target. In most cases, theRunnable interface should be used if you are only planning to override therun() method and no otherThread methods. This is important because classes should not be subclassed unless the programmer intends on modifying or enhancing the fundamental behavior of the class.

    Since:
    1.0
    See Also:
    Thread,Callable

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and TypeMethodDescription
      voidrun()
      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 Detail

      • 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 methodrun is that it may take any action whatsoever.

        See Also:
        Thread.run()