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  1. /* Program Name: BadDate.java
  2.    Function: This program determines if a date entered by the user is valid.  
  3.    Input:  Interactive
  4.    Output: Valid date is printed or user is alerted that an invalid date was entered.
  5. */  
  6.  
  7. import javax.swing.JOptionPane;
  8. import java.util.Scanner;
  9. public class BadDate
  10. {
  11.    public static void main(String args[])
  12.    {
  13.      // Declare variables
  14.      Scanner userInput = new Scanner (System.in);
  15.      String yearString;
  16.      String monthString;
  17.      String dayString;
  18.      int year;
  19.      int month;
  20.      int day;
  21.      boolean validDate = true;
  22.      final int MIN_YEAR = 0, MIN_MONTH = 1, MAX_MONTH = 12, MIN_DAY = 1, MAX_DAY = 31;
  23.  
  24.      // This is the work of the housekeeping() method
  25.      // Get the year, then the month, then the day
  26.  
  27.      System.out.println("Please enter the Month");
  28.                         monthString = userInput.nextLine();
  29.                 System.out.println("Please enter the Day");
  30.                         dayString = userInput.nextLine();
  31.                 System.out.println("Please enter the Year");
  32.                 yearString = userInput.nextLine();
  33.  
  34.  
  35.      // Convert Strings to integers
  36.  
  37.                         month = Integer.parseInt(monthString);
  38.                         day = Integer.parseInt(dayString);
  39.                         year = Integer.parseInt(yearString);
  40.  
  41.      // This is the work of the detailLoop() method
  42.      // Check to be sure date is valid
  43.      if( year <= MIN_YEAR )  // invalid year
  44.                 validDate = false;
  45.      else if ( month < MIN_MONTH || month > MAX_MONTH )  // invalid month
  46.                 validDate = false;
  47.      else if ( day < MIN_DAY || day > MAX_DAY ) // invalid day
  48.                 validDate = false;
  49.  
  50.  
  51.  
  52.      // This is the work of the endOfJob() method
  53.      // Test to see if date is valid and output date and whether it is valid or not
  54.      if( validDate == true )
  55.  
  56.      { System.out.println("(month)/(day)/(year) is a valid date");
  57.         // Output statement
  58.  
  59.      }
  60.      else
  61.      { System.out.println("(month)/(day)/(year) is an invalid date");
  62.         // Output statement
  63.  
  64.      }
  65.  
  66.    } // end of main() method
  67.  
  68. } // end of BadDate class
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.java:9: error: class BadDate is public, should be declared in a file named BadDate.java
public class BadDate
       ^
1 error
stdout 
Standard output is empty
https://ideone.com/pWbjlS
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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