![](../../../../../../../../../style/Empty.gif) ![](../../../../../../../../../style/Empty.gif) ![](../../../../../../../../../style/Empty.gif) | ![](../../../../../../../../../style/ThreeWay.gif) | public class NullCommand extends AbstractCommand implements MapCommand,UndoableMapCommand,UndoableCommand(Code)(Java Doc)
| ![](../../../../../../../../../style/Horizontal.gif) | public interface MapCommand extends Command(Code)(Java Doc)
| ![](../../../../../../../../../style/Horizontal.gif) | public interface UndoableMapCommand extends MapCommand,UndoableCommand(Code)(Java Doc)
| ![](../../../../../../../../../style/Horizontal.gif) | public interface UndoableCommand extends Command(Code)(Java Doc)
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