Programming Challenge 5 of Chapter 8 required you to write a Month class that holds information about the month. Write exception classes for the following error conditions: A number less than I or greater than 12 is given for the month number An invalid string is given for the name of the month* Modify the Month class so that it throws the appropriate exception when either of these errors occurs. Demonstrate the classes in a program.

so here is a month class and I want to throw an exception but I don't know how I am going to do this.

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/** The Month class stores data about a calendar month for the Month Class programming challenge. */

public class Month { private int monthNumber;

/** The No-arg constructor initializes the object to month #1. */

public Month() { monthNumber = 1; }

/** Constructor @param m The month number to initialize the object to. */

public Month(int m) { if (m < 1 || m > 12) monthNumber = 1; else monthNumber = m; }

/** Constructor @param name The name of the month to initialize the object to. */

public Month(String name) { if (name.equalsIgnoreCase("january")) monthNumber = 1; else if (name.equalsIgnoreCase("february")) monthNumber = 2; else if (name.equalsIgnoreCase("march")) monthNumber = 3; else if (name.equalsIgnoreCase("april")) monthNumber = 4; else if (name.equalsIgnoreCase("may")) monthNumber = 5; else if (name.equalsIgnoreCase("june")) monthNumber = 6; else if (name.equalsIgnoreCase("july")) monthNumber = 7; else if (name.equalsIgnoreCase("august")) monthNumber = 8; else if (name.equalsIgnoreCase("september")) monthNumber = 9; else if (name.equalsIgnoreCase("october")) monthNumber = 10; else if (name.equalsIgnoreCase("november")) monthNumber = 11; else if (name.equalsIgnoreCase("december")) monthNumber = 12; else monthNumber = 1; }

/** The setMonthNumber method sets the month. @param m The number of the month. */

public void setMonthNumber(int m) { if (m < 1 || m > 12) monthNumber = 1; else monthNumber = m; }

/** The getMonthNumber method gets the month number. @return The number of the month. */

public int getMonthNumber() { return monthNumber; }

/** The getMonthName method gets the name of the month. @return The name of the month. */

public String getMonthName() { String name; switch (monthNumber) { case 1: name = "January"; break; case 2: name = "February"; break; case 3: name = "March"; break; case 4: name = "April"; break; case 5: name = "May"; break; case 6: name = "June"; break; case 7: name = "July"; break; case 8: name = "August"; break; case 9: name = "September"; break; case 10: name = "October"; break; case 11: name = "November"; break; case 12: name = "December"; break; default: name = "Unknown"; } return name; }

/** toString method @return A reference to a String representation of the object. */ public String toString() { return getMonthName(); } /** equals method @param month2 Another Month object. @return true if the two Month objects contain the same month, false otherwise. */ public boolean equals(Month month2) { boolean status; if (month2.getMonthNumber() == monthNumber) status = true; else status = false; return status; }

/** greaterThan method @param month2 Another Month object. @return true if the calling objects is greater than the argument, false otherwise. */ public boolean greaterThan(Month month2) { boolean status; if (monthNumber > month2.getMonthNumber()) status = true; else status = false; return status; } /** lessThan method @param month2 Another Month object. @return true if the calling objects is less than the argument, false otherwise. */ public boolean lessThan(Month month2) { boolean status; if (monthNumber < month2.getMonthNumber()) status = true; else status = false; return status; } }