Need help with conveyor belt programming

[TFleig78]

Looks like you need to put the conveyor code within the operatorControl method.
Also you need to use the joystick method getRawButton() in order to get the state of a button.
The updated code below should work better.

import edu.wpi.first.wpilibj.Joystick;
import edu.wpi.first.wpilibj.RobotDrive;
import edu.wpi.first.wpilibj.RobotDrive.MotorType;
import edu.wpi.first.wpilibj.SampleRobot;
import edu.wpi.first.wpilibj.Timer;

/**
* This is a demo program showing how to use Mecanum control with the RobotDrive class.
*/
public class Buttontest extends SampleRobot {

	RobotDrive robotDrive;
	Joystick stick;

	// Channels for the wheels
	final int frontLeftChannel	= 0;
	final int rearLeftChannel	= 1;
	final int frontRightChannel	= 2;
	final int rearRightChannel	= 3;

	// The channel on the driver station that the joystick is connected to
	final int joystickChannel	= 3;
	private Object conveyorMotor;
	private Object joystick;
	private Object set;

	public Buttontest() {
		robotDrive = new RobotDrive(frontLeftChannel, rearLeftChannel, frontRightChannel, rearRightChannel);
		robotDrive.setExpiration(0.1);

		stick = new Joystick(joystickChannel);
	}


	/**
	* Runs the motors with Mecanum drive.
	*/
	public void operatorControl() {
		robotDrive.setSafetyEnabled(true);
		while (isOperatorControl() && isEnabled()) {

			// Use the joystick X axis for lateral movement, Y axis for forward movement, and Z axis for rotation.
			// This sample does not use field-oriented drive, so the gyro input is set to zero.
			robotDrive.arcadeDrive(-stick.getY(), -stick.getX());


                        if (stick.getRawButton(3)) {//if button 3 is pressed go full speed up
		               conveyorMotor.set(1);
                        }
		        else if (stick.getRawButton(4)) {//button 4, full speed down
			       conveyorMotor.set(-1);
                        }
                        else{
                               conveyorMotor.set(0); //no button pressed, stop
                        }


			Timer.delay(0.005);	// wait 5ms to avoid hogging CPU cycles
		}
	}
	
	
}