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Take your MonthDay class from Assignment #6 and modify it to throw an IllegalArgumentException when the user of the class attempts to pass an invalid value for month and year. Make sure you have your...

Take your MonthDay class from Assignment #6 and modify it to throw an IllegalArgumentException when the user of the class attempts to pass an invalid value for month and year. Make sure you have your main method(function) in a separate source file demonstrating use of the try/catch block to catch the IllegalArgumentException that the MonthDay class may throw in the event of an invalid month, or year.

class MonthDays {
   private int month;
   private int year;

   public MonthDays(int aMonth, int aYear) {
       setMonth(aMonth);
       setYear(aYear);
   }

   public int getYear() {
       return year;
   }

   public void setYear(int aYear) {
       year = aYear;
   }

   public int getMonth() {
       return month;
   }

   public void setMonth(int aMonth) {
       if (aMonth >= 1 && aMonth <= 12)
           month = aMonth;
   }

   public int getNumberOfDays() {
       int res = -1;
       int mm = month;
       int aYy = year;
       switch (mm) {
       case 1:
           res = 31;
           break;
       case 2:
           if (isLeap(aYy))
               res = 29;
           else
               res = 28;
           break;
       case 3:
           res = 31;
           break;
       case 4:
           res = 30;
           break;
       case 5:
           res = 31;
           break;
       case 6:
           res = 30;
           break;
       case 7:
           res = 31;
           break;
       case 8:
           res = 31;
           break;
       case 9:
           res = 30;
           break;
       case 10:
           res = 31;
           break;
       case 11:
           res = 30;
           break;
       case 12:
           res = 31;
           break;

       }
       return res;
   }

   private boolean isLeap(int year) {
       boolean leap = false;
       // if any year is divisable by 4 than there are many chances for leap
       // year except few
       if (year % 4 == 0) {
           // if it is divisable by 100 than it shoud also divisable by 400
           // like 2000 etc
           if (year % 100 == 0) {
               // year is divisible by 400, so the year is a leap year
               if (year % 400 == 0)
                   leap = true;
               else
                   leap = false;
           } else
               leap = true;
       } else
           leap = false;
       return leap;
   }

}

public class TestMothDays {
   public static void main(String[] args) {
       MonthDays m1 = new MonthDays(2, 2000);
       MonthDays m2 = new MonthDays(2, 2015);
       System.out.println(m1.getNumberOfDays());
       System.out.println(m2.getNumberOfDays());

   }
}

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Homework Answers

Answer #1

class MonthDays {

   private int month;

   private int year;

   public MonthDays(int aMonth, int aYear) {

   setMonth(aMonth);

   setYear(aYear);

   }

   public int getYear() {

   return year;

   }

   public void setYear(int aYear) {

if(aYear <= 0)

throw new IllegalArgumentException("Invalid Year");

   year = aYear;

   }

   public int getMonth() {

   return month;

   }

   public void setMonth(int aMonth) {

   if (aMonth >= 1 && aMonth <= 12)

   month = aMonth;

   else

   throw new IllegalArgumentException("Invalid Month");

   }

   public int getNumberOfDays() {

   int res = -1;

   int mm = month;

   int aYy = year;

   switch (mm) {

   case 1:

   res = 31;

   break;

   case 2:

   if (isLeap(aYy))

   res = 29;

   else

   res = 28;

   break;

   case 3:

   res = 31;

   break;

   case 4:

   res = 30;

   break;

   case 5:

   res = 31;

   break;

   case 6:

   res = 30;

   break;

   case 7:

   res = 31;

   break;

   case 8:

   res = 31;

   break;

   case 9:

   res = 30;

   break;

   case 10:

   res = 31;

   break;

   case 11:

   res = 30;

   break;

   case 12:

   res = 31;

   break;

   }

   return res;

   }

   private boolean isLeap(int year) {

   boolean leap = false;

   // if any year is divisable by 4 than there are many chances for leap

   // year except few

   if (year % 4 == 0) {

   // if it is divisable by 100 than it shoud also divisable by 400

   // like 2000 etc

   if (year % 100 == 0) {

   // year is divisible by 400, so the year is a leap year

   if (year % 400 == 0)

   leap = true;

   else

   leap = false;

   } else

   leap = true;

   } else

   leap = false;

   return leap;

   }

}

public class TestMothDays {

   public static void main(String[] args) {

   MonthDays m1 = new MonthDays(2, 2000);

   MonthDays m2 = new MonthDays(2, 2015);

   System.out.println(m1.getNumberOfDays());

   System.out.println(m2.getNumberOfDays());

   try {

   m1.setMonth(100);

   }catch(IllegalArgumentException e) {

   System.out.println(e.getMessage());

   }

   try {

   m1.setYear(-100);

   }catch(IllegalArgumentException e) {

   System.out.println(e.getMessage());

   }

   }

}

====================================================
SEE OUTPUT
103 public class TestMothDays i 104 public static void main(String[ args) f MonthDays m1-new MonthDays(2, 2000); MonthDays m2

Thanks, PLEASE COMMENT if there is any concern.

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