Question

  myf = new Finch();
    do
    {
              //menu 4
    if (s.equals("Tap Test")) RunTapTest(s);

            } 

  private static void RunTapTest(String s)
    {
        @SuppressWarnings("resource")
        Scanner reader = new Scanner(System.in);
        System.out.println("Enter the time interval in which you want the Finch to move backwards: ");

        //get user input for tapBack
        int tapBack = reader.nextInt();

        System.out.println("\n"+"Running: "+s+"\n");
        long before = System.currentTimeMillis();
        while(System.currentTimeMillis() - before < testtime)
        {
            System.out.println(myf.isTapped());
            //myf.setWheelVelocities(-255,0,testtime);

        }
                    //I can't set myf.isTapped = true
        if (myf.isTapped()) {
            myf.setWheelVelocities(-255,0,tapBack);
        }


    }

Here’s the homework question:

Menu option 4 will determine if the Finch has been tapped on its tail.
If so, the Finch should respond with the spoken words “Thanks” and move backwards
for a user specified time interval.

I’m just trying to fix the user specified time interval (at the moment), and I’m having trouble implementing it.

If I attempt this code

if (myf.isTapped() = true) {
            myf.setWheelVelocities(-255,0,tapBack);
        }

I get an error on:

if (myf.isTapped() = true)

Saying

The left-hand side of an assignment must be a variable

I’m struggling on how to get the robot to move backwards if the myf.isTapped = true

Maybe myf.isTapped cannot take boolean values?

I’m using http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html for user input (integer in this case)

Also, I think the my.isTapped is from an external Jar file.

Answer 1

Change it to

if (myf.isTapped() == true)

or even better

if (myf.isTapped())

= means assignment, == means comparison.