Not sure how to do this loop for my Fibonacci sequence program

[dire lagoon]

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[wispy cloud]

This was the previous step

/**
 *
 * @author vjm
 */
public abstract class Fib {
  /** The Fibonacci number generator 0, 1, 1, 2, 3, 5, ...
      @param n index
      @return nth Fibonacci number
  */
  public abstract double fib (int n);

  /** The order O() of the implementation.
      @param n index
      @return the function of n inside the O()
  */
  public abstract double O (int n);

  private double c;

  public void recordConstant (int n, double t) {

    c = (double) n + t;

  }

  public double estimateTime (int n) {
    return c * Math.log10(n);
  }
}

this is my Fib class

This is my main class

  /** Get a non-negative integer from the using using ui.
      If the user enters a negative integer, like -2, say
      "-2 is negative...invalid"
      If the user enters a non-integer, like abc, say
      "abc is not an integer"
      If the user clicks cancel, return -1.
      @return the non-negative integer entered by the user or -1 for cancel.
  */
  static int getInteger () {
    String s = ui.getInfo("Enter n");
    if (s == null)
      return -1;
    return Integer.parseInt(s);
  }

  public static void doExperiments (Fib fib) {
    /*
    getInteger(); //ask user for int
    int n = getInteger();
    if (n == -1)
      break;

    double est_time = fib.estimateTime(n);
    ui.sendMessage(est_time + "microseconds");
    double t = accurateTime(fib, n);
    */









    System.out.println("doExperiments " + fib);

  }```

These are the two methods im supposed to be editing