command.java

java设计模式源码

package com.oozinoz.robotInterpreter;

/*
 * Copyright (c) 2001, 2005. Steven J. Metsker.
 * 
 * Steve Metsker makes no representations or warranties about
 * the fitness of this software for any particular purpose, 
 * including the implied warranty of merchantability.
 *
 * Please use this software as you wish with the sole
 * restriction that you may not claim that you wrote it.
 */

/**
*  This abstract class represents a hierarchy of classes
*  that encapsulate commands. A command object is a request
*  that is dormant until a caller asks it to execute.
*  
*  Subclasses typically encapsulate some primary function, 
*  and allow for parameters that tailor a command to a 
*  purpose. All subclasses must implement an execute()
*  command, which is abstract here.
*/
public abstract class Command 
{
    /**
    *  Perform the request encapsulated in this command.
    */
    public abstract void execute();
}