Lab 12-12-2005 (1) Constructor

package welcome;

import java.io.*;
public class Date
{
private String month;
private int day;
private int year;

public Date( )
{
month = "January";
day = 1;
year = 1000;
}

public Date(int monthInt, int day, int year)
{ setDate(monthInt, day, year); }

public Date(String monthString, int day, int year)
{ setDate(monthString, day, year); }

public Date(int year)
{ setDate(1, 1, year); }

public Date(Date aDate)
{
if (aDate == null)
{
System.out.println("Fatal Error.");
System.exit(0);
}
month = aDate.month;
day = aDate.day;
year = aDate.year;
}

public void setDate(int monthInt, int day, int year)
{
if (dateOK(monthInt, day, year))
{
this.month = monthString(monthInt);
this.day = day;
this.year = year;
}
else
{
System.out.println("Fatal Error");
System.exit(0);
}
}

public void setDate(String monthString, int day, int year)
{
if (dateOK(monthString, day, year))
{
this.month = monthString;
this.day = day;
this.year = year;
}
else
{
System.out.println("Fatal Error");
System.exit(0);
}
}

public void setDate(int year)
{ setDate(1, 1, year); }

public void setYear(int year)
{
if ( (year <> 9999) )
{
System.out.println("Fatal Error");
System.exit(0);
}
else
this.year = year;
}

public void setMonth(int monthNumber)
{
if ((monthNumber <= 0) || (monthNumber > 12))
{
System.out.println("Fatal Error");
System.exit(0);
}
else
month = monthString(monthNumber);
}

public void setDay(int day)
{
if ((day <= 0) || (day > 31))
{
System.out.println("Fatal Error");
System.exit(0);
}
else
this.day = day;
}

public int getMonth( )
{
if (month.equals("January"))
return 1;
else if (month.equals("February"))
return 2;
else if (month.equalsIgnoreCase("March"))
return 3;
else if (month.equalsIgnoreCase("April"))
return 4;
else if (month.equalsIgnoreCase("May"))
return 5;
else if (month.equals("June"))
return 6;
else if (month.equalsIgnoreCase("July"))
return 7;
else if (month.equalsIgnoreCase("August"))
return 8;
else if (month.equalsIgnoreCase("September"))
return 9;
else if (month.equalsIgnoreCase("October"))
return 10;
else if (month.equals("November"))
return 11;
else if (month.equals("December"))
return 12;
else
{
System.out.println("Fatal Error");
System.exit(0);
return 0;
}
}

public int getDay( )
{ return day; }

public int getYear( )
{ return year; }

public String toString( )
{ return (month + " " + day + ", " + year); }

public boolean equals(Date otherDate)
{
return ( (month.equals(otherDate.month)) &&amp;amp; (day == otherDate.day) && (year == otherDate.year) );
}

public boolean precedes(Date otherDate)
{
return ( (year < year ="=">
|| (year == otherDate.year && month.equals(otherDate.month)&& day <>
}

public void readInput( ) throws IOException
{
boolean tryAgain = true;
BufferedReader keyboard= new BufferedReader(new InputStreamReader(System.in));

while (tryAgain)
{
System.out.println("Enter month, day, and year.");
System.out.println("Do not use a comma.");
String monthInput = keyboard.readLine( );
int dayInput = keyboard.read( );
int yearInput = keyboard.read( );
if (dateOK(monthInput, dayInput, yearInput) )
{
setDate(monthInput, dayInput, yearInput);
tryAgain = false;
}
else
System.out.println("Illegal date. Reenter input.");
}
}

private boolean dateOK(int monthInt, int dayInt, int yearInt)
{
return ( (monthInt >= 1) &&amp;amp; (monthInt <= 12) && (dayInt >= 1) && (dayInt <= 31) &&
(yearInt >= 1000) &&amp;amp; (yearInt <= 9999) );
}

private boolean dateOK(String monthString, int dayInt, int yearInt)
{
return ( monthOK(monthString) &&amp;amp; (dayInt >= 1) && (dayInt <= 31) && (yearInt >= 1000) &&amp; (yearInt <= 9999) );
}

private boolean monthOK(String month)
{
return (month.equals("January") || month.equals("February") ||
month.equals("March") || month.equals("April") ||
month.equals("May") || month.equals("June") ||
month.equals("July") || month.equals("August") ||
month.equals("September") || month.equals("October") ||
month.equals("November") || month.equals("December") );
}

private String monthString(int monthNumber)
{
switch (monthNumber)
{
case 1: return "January";
case 2: return "February";
case 3: return "March";
case 4: return "April";
case 5: return "May";
case 6: return "June";
case 7: return "July";
case 8: return "August";
case 9: return "September";
case 10: return "October";
case 11: return "November";
case 12: return "December";
default:
System.out.println("Fatal Error");
System.exit(0);
return "Error";
}
}


}

package welcome;

public class ConstructorsDemo
{
public static void main(String[] args)
{
Date date1 = new Date("December", 16, 1770),
date2 = new Date(12, 27, 1756),
date3 = new Date(1882),
date4 = new Date();

System.out.println("Whose birthday is " + date1 + "?");
System.out.println("Whose birthday is " + date2 + "?");
System.out.println("Whose birthday is " + date3 + "?");
System.out.println("The default date is " + date4 + ".");
}
}