/**
 *  This programs reads an integer to indicate a month.
 *  It prints the number of days in the month and the name
 *  of the month.
 */

import javax.swing.JOptionPane;

public class PrintMonthDemo {

  public static void main( String[] args ) {

    String input = JOptionPane.showInputDialog( "Enter an integer between 1 and 12:" );
    int monthNum = Integer.parseInt( input );


    if( monthNum < 1 || monthNum > 12 ) {
      // Invalid: not in range.
      JOptionPane.showMessageDialog(null, "Integer must be between 1 and 12" );
      System.exit(0);
    }

    // Determine the number of days in the month
    int numDaysInMonth;
    switch( monthNum ) {
      case 1: case 3: case 5: case 7: 
      case 8: case 10: case 12:
        numDaysInMonth =  31;
        break;

      case 4: case 6: case 9: case 11:
        numDaysInMonth = 30;
        break;

      case 2:
        numDaysInMonth = 28;	// ignore leap years for now
        break;

      default:
        numDaysInMonth = -1;
        break;
    }

    // Determine the month name.
    String monthName;
    switch( monthNum ) {
      case  1: monthName = "January"; break;
      case  2: monthName = "February"; break;
      case  3: monthName = "March"; break;
      case  4: monthName = "April"; break;
      case  5: monthName = "May"; break;
      case  6: monthName = "June"; break;
      case  7: monthName = "July"; break;
      case  8: monthName = "August"; break;
      case  9: monthName = "September"; break;
      case 10: monthName = "October"; break;
      case 11: monthName = "November"; break;
      case 12: monthName = "December"; break;
      default: monthName = "???"; break;
    }

    String output = monthName + " has " + numDaysInMonth + " days.";
    JOptionPane.showMessageDialog( null, output );

    System.exit(0);
  }
}