JAVA

Lab Java Constructor

package s9226307;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

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);
}

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

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

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.");
}
}

public void writeOutput()
{
System.out.println(month + " " + day + ", " + year);
}

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

public void setMonth(String month)
{
this.month = month;
}

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

public void setYear(int year)
{
if ( (year <= 1000) || (year >= 9999))
{
System.out.println("Fatal Error");
System.exit(0);
}
else
this.year = year;
}

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

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

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

public int getDay()
{
return day;
}

public int getYear()
{
return year;
}

public int getMonth()
{
if (month.equalsIgnoreCase("January"))
return 1;
else if (month.equalsIgnoreCase("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.equalsIgnoreCase("November"))
return 11;
else if (month.equalsIgnoreCase("December"))
return 12;
else
{
System.out.println("Fatal Error");
System.exit(0);
return 0;
}
}

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 s9226307;


public class s9226307 {
public s9226307 () {
}

public static void main(String[] args)
{


Date date1 = new Date("December", 16, 1770),
date2 = new Date(1, 27, 1756),
date3 = new Date(1882),
date4 = new Date();

Date birthday = new Date("January",1,2000);

birthday.setDate("February",1,2000);
birthday = new Date("March",1,2000);


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+ ".");


}

}

posted by Jason @ 5:00 AM