Chapter 10 Exercise 14, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

Chapter 10 Exercise 14:

10.14  (The MyDate class) Design a class named MyDate. The class contains:
"■ The data fields year, month, and day that represent a date. month is 0-based, i.e., 0 is for January."
"■ A no-arg constructor that creates a MyDate object for the current date."
"■ A constructor that constructs a MyDate object with a specified elapsed time since midnight, January 1, 1970, in milliseconds."
"■ A constructor that constructs a MyDate object with the specified year, month, and day."
"■ Three getter methods for the data fields year, month, and day, respectively."
"■ A method named setDate(long  elapsedTime) that sets a new date for the object using the elapsed time."
"Draw the UML diagram for the class and then implement the class. Write a test program that creates two MyDate objects (using new MyDate() and new MyDate(34355555133101L)) and displays their year, month, and day."
"(Hint: The first two constructors will extract the year, month, and day from the elapsed time.
For example, if the elapsed time is 561555550000 milliseconds, the year is 1987, the month is 9,
and the day is 18. You may use the GregorianCalendar class discussed in Programming Exercise 9.5
to simplify coding.)"

import java.util.Calendar;
import java.util.GregorianCalendar;
public class MyDate {

    private int year;
    private int month;
    private int day;

    public MyDate() {

        GregorianCalendar cal = new GregorianCalendar();
        year = cal.get(Calendar.YEAR);
        month = cal.get(Calendar.MONTH);
        day = cal.get(Calendar.DAY_OF_MONTH);

    }

    public MyDate(long elapsedTime) {
        GregorianCalendar cal = new GregorianCalendar();
        cal.setTimeInMillis(elapsedTime);
        year = cal.get(Calendar.YEAR);
        month = cal.get(Calendar.MONTH);
        day = cal.get(Calendar.DAY_OF_MONTH);
    }

    public MyDate(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public int getMonth() {
        return month;
    }

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

    public int getDay() {
        return day;
    }

    public void setDay(int day) {
        this.day = day;
    }

    public void setDate(long elapsedTime) {
        GregorianCalendar cal = new GregorianCalendar();
        cal.setTimeInMillis(elapsedTime);
        year = cal.get(Calendar.YEAR);
        month = cal.get(Calendar.MONTH);
        day = cal.get(Calendar.DAY_OF_MONTH);
    }
}

public class Exercise_14 {

    public static void main(String[] args) {

        MyDate date1 = new MyDate();
        MyDate date2 = new MyDate(34355555133101L);

        System.out.println("Date1 - Month: " + date1.getMonth() +
                " Day: " + date1.getDay() + " Year: " + date1.getYear());
        System.out.println("Date2 - Month: " + date2.getMonth() +
                " Day: " + date2.getDay() + " Year: " + date2.getYear());

    }
}