functional interface that takes nothing and returns nothing


This question already has an answer here:


How about Runnable :

public interface Runnable {
     * When an object implementing interface <code>Runnable</code> is used
     * to create a thread, starting the thread causes the object's
     * <code>run</code> method to be called in that separately executing
     * thread.
     * <p>
     * The general contract of the method <code>run</code> is that it may
     * take any action whatsoever.
     * @see     java.lang.Thread#run()
    public abstract void run();

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