Java tutorial
/* * Copyright 2006 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.google.gwt.user.client; import com.google.gwt.core.client.Scheduler; /** * Encapsulates an action for later execution, often from a different context. * * <p> * The Command interface provides a layer of separation between the code * specifying some behavior and the code invoking that behavior. This separation * aids in creating reusable code. For example, a * {@link com.google.gwt.user.client.ui.MenuItem} can have a Command associated * with it that it executes when the menu item is chosen by the user. * Importantly, the code that constructed the Command to be executed when the * menu item is invoked knows nothing about the internals of the MenuItem class * and vice-versa. * </p> * * <p> * The Command interface is often implemented with an anonymous inner class. For * example, * * <pre> * Command sayHello = new Command() { * public void execute() { * Window.alert("Hello"); * } * }; * sayHello.execute(); * </pre> * * </p> * This type extends ScheduledCommand to help migrate from DeferredCommand API. */ public interface Command extends Scheduler.ScheduledCommand { /** * Causes the Command to perform its encapsulated behavior. */ void execute(); }