The error trace seems to indicate that the InputMismatchException is thrown when scan.nextInt() is called.

After your print System.out.println("Would you like to enter another location?");, if the user inputs anything other than an integer, scan.nextInt() will throw an exception. Even if you read the user's input as a string as suggested by someone else, the parseInt method in escape = Integer.parseInt(scan.nextLine()) will throw an error because the string may not be a valid integer.

I suggest adding try-catch block as follows around the scan.nextInt() call so that your program doesn't crash when a user inputs something other than a valid integer (like the number 8.238).

boolean inputValid = false;
System.out.println("Would you like to enter another location?");
while (!inputValid) {
    try {
        escape = scan.nextInt();
        inputValid = true;
    } catch (InputMismatchException e) {
        inputValid = false;
        System.out.println("Please enter a valid Integer");
    }
}

This code will continue asking the user until the user enters a valid integer.

I don't know how onlinegdp - online compiler will save another class file & reference it. If they have functionality then you can try to add them in package & import that file using package.

It's pain to see the folder/project structure on most of the online compiler. They are meant to run small snippet & not to run the whole project.

Below is the snippet you can run on onlinegdp without creating the different file.

public class Main
{
  public static void main (String[]args)
  {
    Worker bob = new Worker ();
      System.out.println (bob.getHours ());
  }

  static public class Worker
  {
    private int hours;
    private double rate;
    public Worker ()
    {
      hours = 999;
      rate = 999;
    }
    public Worker (int nHours, double nRate)
    {
      hours = nHours;
      rate = nRate;
    }
    public int getHours ()
    {
      return hours;
    }
    public void setHours (int nHours)
    {
      hours = nHours;
    }
    public double getRate ()
    {
      return rate;
    }
    public void setRate (double nRate)
    {
      rate = nRate;
    }
    public double paycheck ()
    {
      return rate * hours;
    }
    public void raise (double raise)
    {
      rate = raise + rate;
    }

  }

}