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CommandGroupProgramming

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1	1	The last example showed two simple commands and how to connect them with the user interface, but the commands were simple: they set a servo position and immediately finished. In practice, robot commands often need to run continuously until something happens; for example, a command to raise an arm might start a motor moving and continue until some time has passed or an encoder indicates that the arm has moved a certain distance or a limit switch is pressed. WPILib commands make this easy. Even better, you can string several such commands together in a !CommandGroup to effect complex behaviors.
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3		Commands can be grouped together to run in sequence for example, when the X button is pressed, the following code will run the servo open command, allow time for it to finish, and then run the servo close command:
	3	Commands can be grouped together to run in sequence for example, when the X button is pressed, the following code will run the servo open command, allow time for it to finish, and then run the servo close command. The !OpenCommand adds a Timer to allow the servo motor time to complete moving to the open position before the !CloseCommand is run :
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5	5	Constants.java