public boolean mainMenu()
    {
        System.out.println("City Connection");
        System.out.println("Choose and option by typing the"
                + " corresponding number and pressing enter:");
        System.out.println("1. Show Connecting Cities");
        System.out.println("2. Get Shortest Path");
        System.out.println("3. Exit");
        int choice = scr.nextInt();
        switch(choice)
        {
            case 1:
                this.showConnections();
                break;
            case 2:
                this.getShortestPath();
                break;
            case 3:
                System.out.println("Goodbye!!!");
                return false;
            default:
                System.out.println("Invalid input restarting.");
                return true;
        }
        return true;
    }