Chapter 9, Problem 3PP

Date format converter

Program plan:

“DateFormatConverter.java”:

• Import required packages.
• Define the class “DateFormatConverter”.
  • Declare required variables.
  • Define an array and assign it with the months.
  • Define the “main()” method.
    • Do until the user enters other than “Y” or “y”.
      • Inside the “try” block,
        • Get the date from the user.
        • Trim the input.
        • Store the month value in a variable.
        • Check if that value is less than 0.
        • • Assign “false” to “validInput”.
          • Throw an exception.
        • Check if month value is less than 1 or greater than 12.
        • • Assign “false” to “validInput”.
          • Throw an exception.
        • Otherwise,
        • • Get the date value and store it in a variable.
          • Call the function “dayCheck()”.
      • Catch “MonthException”.
        • Print the error message.
      • Check if the function “validInput()” returns true.
        • Print the month name and its date.
      • Get the response from the user whether the user wants to do it again or not.
  • Give function to convert string to integer for month.
    • Get the position of “/”.
    • Check if that position is equal to 2.
      • Return the value.
    • Check if that position is equal to 1.
      • Return the integer value.
    • Otherwise,
      • Return -1.
  • Give function to convert string to integer for day.
    • Get the number of characters.
    • Check if that number is equal to 2.
      • Return the value.
    • Check if that number is equal to 1.
      • Return the integer value.
    • Otherwise,
      • Return -1.
  • Function definition to convert ASCII value to integer.
    • Switch to the digit.
      • Assign the value according to the character digit.
  • Give function definition to check the day.
    • Inside the “try” block,
      • Switch to the month number.
        • If the month number is 1, 3, 5, 7, 8, 10 and 12,
        • • Check if the day is less than 1 or greater than 31.
            • Assign “false” to “validInput”.
            • Print the error message.
              • Otherwise,
                • Assign “true” to “validInput”.
              • Break the case.
        • If the month number is 4, 6, 9 and 11,
        • • Check if the day is less than 1 or greater than 30.
            • Assign “false” to “validInput”.
            • Print the error message.
              • Otherwise,
                • Assign “true” to “validInput”.
              • Break the case.
        • If the month number is 2,
        • • Check if the day is less than 1 or greater than 29.
            • Assign “false” to “validInput”.
            • Print the error message.
              • Otherwise,
                • Assign “true” to “validInput”.
              • Break the case.
    • Inside the “catch” block for “DayException”, print the error message.

“DayException.java”:

• Define the exception class “DayException”.
  • Define a default constructor.
    • Call the parent class’s method.
  • Define two parameterized constructors.
    • Call the parent class’s method by passing a message.

“MonthException.java”:

• Define the exception class “MonthException”.
  • Define a default constructor.
    • Call the parent class’s method.
  • Define two parameterized constructors.
    • Call the parent class’s method by passing a message.