Java Date of Birth Input and Output-CodePudding

I'm trying to use Scanner method to let me input a date of birth in this format - mm/dd/yy and the output that I'd like to get would be something like this.

Input - 02/06/12
Output - February 6, 2012

I'm also trying to limit the value for day(dd) and make sure it doesn't go past 32, and the value for year(yy) to not exceed 2022. I assume I save the input as a String, however I'm not sure how to separate them and have a condition where I can assign certain String values to each month.

CodePudding user response：

Following is the working code to your above problem statement as given below. Please add logic for date accordingly as I am assuming that you will be submitting the date in YYYY format.

 public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter Date:");
    String date = scanner.nextLine();  // Read user input
    System.out.println("Submitted Date is: "   date);  // Output user input
    String arr[] = date.split("/");
    System.out.println("Output --> "   getMonth(arr[0])   " "   getDate(arr[1])   ", "   arr[2]);
  }

  public static String getMonth(String month) {
    if (Integer.parseInt(month) > 12) {
      throw new IllegalArgumentException("Invalid Month");
    }
    switch (month) {
      case "01":
        return "January";
      case "02":
        return "February";
      case "03":
        return "March";
      case "04":
        return "April";
      case "05":
        return "May";
      case "06":
        return "June";
      case "07":
        return "July";
      case "08":
        return "August";
      case "09":
        return "September";
      case "10":
        return "October";
      case "11":
        return "November";
      case "12":
        return "December";
      default:
        return "Invalid Month";
    }
  }

  public static String getDate(String date) {
    if (date.startsWith("0")) {
      return String.valueOf(date.charAt(1));
    }
    if (Integer.parseInt(date) > 31) {
      throw new IllegalArgumentException("Invalid Date");
    }
    return date;
  }

CodePudding user response：

Parse as a LocalDate object. Automatically localize to generate output text.

LocalDate
.parse( 
    "02/06/12" ,
    DateTimeFormatter.ofPattern( "MM/dd/uu" )
)
.format(
    DateTimeFormatter
    .ofLocalizedDate( FormatStyle.MEDIUM )
    .withLocale( Locale.US ) 
)

To handle faulty input, trap for DateTimeParseException.

To constrain the year, interrogate for the year using LocalDate#getYear. Or, build a custom Jakarta Bean Validation validator.

All of this has been covered many times already on Stack Overflow. So search to learn more.