Chapter 7, Problem 10PS

Tracing the Recursion. Tracing the Recursion. Observe the recursive solution provided below. 1. Which line(s) of this program define(s) the base case of sumOfDigits() method? 2. Which line(s) of this program include recursive call(s)? 3. Trace the recursion below. You must show the trace step by step; otherwise – little to no credit! 4. Show me the final result! 1 public class SumOfDigitsCalculator { 30 123456 7% 8 public static void main(String[] args) { System.out.println(sumOfDigits(1234)); } public static int sumOfDigits (int number) { if (number == 0) 9 10 11 12 } 13 } else return 0; return number % 10 + sumOfDigits (number / 10);

module : java 731   Question3:                                                                                                                                    (30 MARKS) Passenger Rail Agency for South Africa Train Scheduling System Problem Statement Design and implement a train scheduling system for Prasa railway network. The system should handle the following functionalities: 1. Scheduling trains: Allow the addition of train schedules, ensuring that no two trains use the same platform at the same time at any station. 2. Dynamic updates: Enable adding new train schedules and canceling existing ones. 3. Real-time simulation: Use multithreading to simulate the operation of trains (e.g., arriving, departing). 4. Data management: Use ArrayList to manage train schedules and platform assignments. Requirements 1. Add Train Schedule, Cancel Scheduled Train, View Train Schedules and Platform Management 2. Concurrency Handling with Multithreading i.e Use threads to simulate train operations,…

please answer my 2 java questions correctly , include all comments etc and layout and structure must be correct , follow the requirements