Java

OOP GUIDE / WORK

DATE CLASS SOLUTIONS

TASK – PART 1 – DATE CLASS: INSTANCE VARIABLES

Here is my solution:

public class Date

{

private int year;

private int month;

private int day;

}

TASK – PART 2 – DATE CLASS: CONSTRUCTOR

Here is my solution:

public class Date

{

private int year;

private int month;

private int day;

public Date(int year, int month, int day)

{

this.year = year;

this.month = month;

this.day = day;

}

}

TASK – PART 3 – DATE CLASS: GET METHODS

Here is my solution:

public class Date

{

private int year;

private int month;

private int day;

public Date(int year, int month, int day)

{

this.year = year;

this.month = month;

this.day = day;

}

public int getDay()

{

return day;

}

public int getMonth()

{

return month;

}

public int getYear()

{

return year;

}

public String getMonthName()

{

if (month == 1)

return "January";

else if (month == 2)

return "February";

else if (month == 3)

return "March";

else if (month == 4)

return "April";

else if (month == 5)

return "May";

else if (month == 6)

return "June";

else if (month == 7)

return "July";

else if (month == 8)

return "August";

else if (month == 9)

return "September";

else if (month == 10)

return "October";

else if (month == 11)

return "November";

else if (month == 12)

return "December";

else

return "ERROR"; //not necessarily a great solution

}

public String toString()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return year + "-" + month2Digit + "-" + day2Digit;

}

}

TASK – PART 4 – DATE CLASS: MORE DATE FORMATS

Here is my solution:

public class Date

{

private int year;

private int month;

private int day;

public Date(int year, int month, int day)

{

this.year = year;

this.month = month;

this.day = day;

}

public int getDay()

{

return day;

}

public int getMonth()

{

return month;

}

public int getYear()

{

return year;

}

public String getMonthName()

{

if (month == 1)

return "January";

else if (month == 2)

return "February";

else if (month == 3)

return "March";

else if (month == 4)

return "April";

else if (month == 5)

return "May";

else if (month == 6)

return "June";

else if (month == 7)

return "July";

else if (month == 8)

return "August";

else if (month == 9)

return "September";

else if (month == 10)

return "October";

else if (month == 11)

return "November";

else if (month == 12)

return "December";

else

return "ERROR"; //not necessarily a great solution

}

public String toString()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return year + "-" + month2Digit + "-" + day2Digit;

}

//Format example: 2022-10-15

public String getInternationalNumericDate()

{

return toString();

}

//Format example: 2022 October 15

public String getInternationalWordedDate()

{

return year + " " + getMonthName() + " " + day;

}

//Format example: 15-10-2022

public String getBritishNumericDate()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return day2Digit + "-" + month2Digit + "-" + year;

}

//Format example: 15 October 2022

public String getBritishWordedDate()

{

return day + " " + getMonthName() + " " + year;

}

//Format: 10-15-2022

public String getAmericanNumericDate()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return month2Digit + "-" + day2Digit + "-" + year;

}

//Format: October 15, 2022

public String getAmericanWordedDate()

{

return getMonthName() + " " + day + ", " + year;

}

}

TASK – PART 5 – DATE CLASS: ANOTHER INSTANCE VARIABLE

Here is my solution:

public class Date

{

private int year;

private int month;

private int day;

private String separator;

public Date(int year, int month, int day)

{

this.year = year;

this.month = month;

this.day = day;

separator = "-";

}

public int getDay()

{

return day;

}

public int getMonth()

{

return month;

}

public int getYear()

{

return year;

}

public String getMonthName()

{

if (month == 1)

return "January";

else if (month == 2)

return "February";

else if (month == 3)

return "March";

else if (month == 4)

return "April";

else if (month == 5)

return "May";

else if (month == 6)

return "June";

else if (month == 7)

return "July";

else if (month == 8)

return "August";

else if (month == 9)

return "September";

else if (month == 10)

return "October";

else if (month == 11)

return "November";

else if (month == 12)

return "December";

else

return "ERROR"; //not necessarily a great solution

}

public String toString()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return year + separator + month2Digit + separator + day2Digit;

}

//Format example: 2022-10-15

public String getInternationalNumericDate()

{

return toString();

}

//Format example: 2022 October 15

public String getInternationalWordedDate()

{

return year + " " + getMonthName() + " " + day;

}

//Format example: 15-10-2022

public String getBritishNumericDate()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return day2Digit + separator + month2Digit + separator + year;

}

//Format example: 15 October 2022

public String getBritishWordedDate()

{

return day + " " + getMonthName() + " " + year;

}

//Format: 10-15-2022

public String getAmericanNumericDate()

{

//WE NEED A TWO DIGIT MONTH

String month2Digit;

if (month < 10)

month2Digit = "0" + month;

else

month2Digit = "" + month;

//WE NEED A TWO DIGIT DAY

String day2Digit;

if (day < 10)

day2Digit = "0" + day;

else

day2Digit = "" + day;

return month2Digit + separator + day2Digit + separator + year;

}

//Format: October 15, 2022

public String getAmericanWordedDate()

{

return getMonthName() + " " + day + ", " + year;

}

public String getSeparator()

{

return separator;

}

public void setSeparator(String separator2)

{

separator = separator2;

}

}

TASK – PART 6 – TESTING

Here is my solution:

public class DateTester

{

public static void main(String[] args)

{

Date d1 = new Date(2024,10,7);

System.out.println(d1);

System.out.println(d1.getInternationalNumericDate());

System.out.println(d1.getInternationalWordedDate());

System.out.println(d1.getBritishNumericDate());

System.out.println(d1.getBritishWordedDate());

System.out.println(d1.getAmericanNumericDate());

System.out.println(d1.getAmericanWordedDate());

d1.setSeparator("/");

System.out.println(d1.getInternationalNumericDate());

System.out.println(d1.getBritishNumericDate());

System.out.println(d1.getAmericanNumericDate());

d1.setSeparator("\\"); //need two backslashes

System.out.println(d1.getInternationalNumericDate());

System.out.println(d1.getBritishNumericDate());

System.out.println(d1.getAmericanNumericDate());

System.out.println(d1.getMonthName());

}

}