How do I handle misinputs when using the substring method?

Question

I am trying to complete a project that takes a date in the format: Month Day, Year Example: December 1, 1990. After taking in this date, I am trying to output it in the format Month/Day/Year. The method that I am expected to use is substring. I am running into issues with errors when handling misinputs. For example, if there isn't a comma, then an error occurs and the loop is terminated. I am wondering if there is a way to check each value for an error and then continue through the loop if an error is found. Here is my code so far:

 public static void main(String[] args) {
      Scanner scnr = new Scanner(System.in);
                          // Flag to indicate next iteration
      String lineString = "";
      String month;
      int year;
      int day;
      char comma;
            
      lineString = scnr.nextLine();
      while(!lineString.equals(-1)) {
    
       month = lineString.substring(0, lineString.indexOf(" "));
       day = Integer.parseInt(lineString.substring(lineString.indexOf(" ") + 1, lineString.indexOf(',') ));   
       comma = lineString.charAt(lineString.indexOf(','));
       year = Integer.parseInt(lineString.substring(lineString.length()-4));
   
       System.out.println(month);
       System.out.println(day);
       System.out.println(comma);
       System.out.println(year);
       
       lineString = scnr.nextLine();
      }

Answer 1

You can wrap your code inside while loop in a try-catch block. It will catch your exception without terminating the program.