MyDate2.java

MyDate2.java

// Fixed IncrementDate method
// 10/08/18

import java.util.Calendar;

public class MyDate2 implements Comparable<MyDate2> {
	private int month;
	private int day;
	private int year;

	private static Calendar x;
	private static int[] monthArr = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

	static {
		x = Calendar.getInstance();
	}

	// Getters and Setters

	public int getMonth() {
		return this.month;
	}

	public int getDay() {
		return this.day;
	}

	public int getYear() {
		return this.year;
	}

	public void setDate(int month, int day, int year) {
		setYear(year);
		setMonth(month);
		setDay(day);
	}

	private void setYear(int y) {
		if (y >= 1)
			this.year = y;
		else
			System.err.println("ERROR: Bad Year Specified: " + y);
	}

	private void setMonth(int m) {
		if (m >= 1 && m <= 12)
			this.month = m;
		else
			System.err.println("ERROR: Bad Month Specified: " + m);
	}

	private void setDay(int d) {
		if (this.month == 2) {
			if (d >= 1 && d <= (isLeapYear() ? 29 : 28))
				day = d;
			else
				System.err.println("ERROR: Bad Day Specified: " + d + " for leapyear February");
		}
		else if (this.month >= 1 && this.month <= 12) {
			if (d >= 1 && d <= monthArr[this.month])
				this.day = d;
			else
				System.err.println("ERROR: Bad Day Specified: " + d + " for month: " + month);
		}
		else {
			System.err.println("ERROR: VERY BAD MONTH: " + month);
		}
	}

	// Constructors

	public MyDate2(int month, int day, int year) {
		setDate(month, day, year);
	}

	public MyDate2(int month, int year) {
		this(month, 1, year);
	}

	public MyDate2(int year) {
		this(1, 1, year);
	}

	public MyDate2() {
		this(x.get(Calendar.MONTH) + 1, x.get(Calendar.DATE), x.get(Calendar.YEAR));
	}

	// Utility Methods

	public String toString() {
		return String.format("%02d/%02d/%02d", this.month, this.day, this.year);
	}

	public boolean isLeapYear() {
		return year % 4 == 0 && year % 100 != 0 || year % 400 == 0;
	}

	public int getDaysInMonth() {
		int noOfDays = 0;
		if (this.month >= 1 && this.month <= 12) {
			noOfDays = monthArr[this.month];
			if (this.month == 2 && isLeapYear())
				noOfDays = 29;
		}
		return noOfDays;
	}

	int numberOfDaysLeft() {
		if (isLeapYear())
			return 366 - numberOfDaysPassed();
		else
			return 365 - numberOfDaysPassed();
	}

	public int numberOfDaysPassed() {
		int sumDays = 0;
		for (int i = 1; i < this.month; i++)
			sumDays += monthArr[i];
		if (isLeapYear() && this.month > 2)
			sumDays += this.day + 1;
		else
			sumDays += this.day;
		return sumDays;
	}

	public void incrementDate(int nDays) {
		for (int i = 0; i < nDays; i++) {
			this.day++;
			if (this.day > monthArr[this.month] + (this.isLeapYear() ? 1 : 0)) {
				this.day = 1;
				this.month++;
				if (this.month > 12) {
					this.month = 1;
					this.year++;
				}
			}
		}
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + day;
		result = prime * result + month;
		result = prime * result + year;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		MyDate2 other = (MyDate2) obj;
		if (day != other.day)
			return false;
		if (month != other.month)
			return false;
		if (year != other.year)
			return false;
		return true;
	}

	public int compareTo(MyDate2 other) {
		if (this.year != other.year)
			return this.year - other.year;
		if (this.month != other.month)
			return this.month - other.month;
		return this.day - other.day;
	}

}