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+/**%0A * Copyright (C) 2015 The Authors.%0A */%0Apackage dk.itu.kelvin.util.function;%0A%0A/**%0A * The %7B@link Callback%7D interface describes a functional callback that can be%0A * executed after finishing an asynchronous task.%0A */%0A@FunctionalInterface%0Apublic interface Callback %7B%0A  /**%0A   * Execute the callback.%0A   */%0A  void done();%0A%7D%0A

Implement functional callback interface.