sjm.imperative
Class NullCommand

java.lang.Object
  |
  +--sjm.imperative.Command
        |
        +--sjm.imperative.NullCommand

public class NullCommand

extends Command

This command does nothing, which can simplify coding in some cases. For example, an "if" command with no given "else" uses a NullCommand for its else command.

Constructor Summary

NullCommand()

Method Summary

void	execute() Does nothing.
java.lang.String	toString() Returns a string description of this null command.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NullCommand

public NullCommand()

Method Detail

execute

public void execute()

Does nothing.

Overrides:

execute in class Command

toString

public java.lang.String toString()

Returns a string description of this null command.

Overrides:

toString in class java.lang.Object

Returns:

a string description of this null command