Answer to Question #297642 in Java | JSP | JSF for Bruhh

Question

1. Date

by CodeChum Admin

Create a new file called Date.java and construct a Date class that models a calendar date with day, month and year. It contains the following members:

more info here.

https://pastebin.com/cGAumGnt

Answer 1

import java.util.*;


enum Day {
	MON, TUE, WED, THU, FRI, SAT, SUN;
}


class Date {
	// private integer instance variables: day, month (1 - 12), and year (4-digit)
	private int day, month, year;


	/**
	 * a default constructor which will set the date to 01/01/1972. When called,
	 * this also prints the string "Default Constructor"
	 */
	public Date() {
		setDate(1, 1, 1972);
		System.out.println("Default Constructor");
	}


	/**
	 * an overloaded constructor that takes in the day, month, and year as
	 * arguments. When called, this also prints the string "Overloaded Constructor"
	 * 
	 * @param day
	 * @param month
	 * @param year
	 */
	public Date(int day, int month, int year) {
		setDate(day, month, year);
		System.out.println("Overloaded Constructor");
	}


	/**
	 * @return the day
	 */
	public int getDay() {
		return day;
	}


	/**
	 * @param day the day to set
	 */
	public void setDay(int day) {
		this.day = day;
	}


	/**
	 * @return the month
	 */
	public int getMonth() {
		return month;
	}


	/**
	 * @param month the month to set
	 */
	public void setMonth(int month) {
		this.month = month;
	}


	/**
	 * @return the year
	 */
	public int getYear() {
		return year;
	}


	/**
	 * @param year the year to set
	 */
	public void setYear(int year) {
		this.year = year;
	}


	/**
	 * sets the day, month, and year based on the arguments
	 * 
	 * @param day
	 * @param month
	 * @param year
	 */
	public void setDate(int day, int month, int year) {
		this.setDay(day);
		this.setMonth(month);
		this.setYear(year);


	}


	/**
	 * returns the day of the week (MON, TUE, WED, THU, FRI, SAT, SUN) for the date.
	 * Create an enum Day to handle this. Follow the formula below for this.
	 * 
	 * @return
	 */
	public String dayOfTheWeek() {
		// If the month is January or February, subtract 1 from the year to get a new Y
		// and add 12 to the month to get a new M.
		int Y = year;
		int M = month;
		int D = day;
		if (month == 1 || month == 2) {
			Y = year - 1;
			M = month + 12;
		}
		double A = Y / 100;
		double B = A / 4;
		double C = 2 - A + B;
		double E = 365.25 * (Y + 4716);
		double F = 30.6001 * (M + 1);
		double JD = C + D + E + F - 1524.5;
		int dayOfWeek = (int) Math.round((JD % 7));


		return "" + Day.values()[dayOfWeek - 1];
	}


	/***
	 * returns "DD/MM/YYYY", with leading zero for DD and MM if applicable (note:
	 * return the string and do not display it from the method itself)
	 */
	public String toString() {
		return String.format("%02d/%02d/%d", day, month, year);
	}


}


class Main {


	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);


		int mode = sc.nextInt();


		Date date = null;
		if (mode == 1) {
			date = new Date();
		} else if (mode == 2) {
			int day = sc.nextInt();
			int month = sc.nextInt();
			int year = sc.nextInt();
			date = new Date(day, month, year);
		}


		int m = sc.nextInt();


		for (int ctr = 0; ctr < m; ctr++) {
			int operation = sc.nextInt();


			if (operation == 1) {
				int day = sc.nextInt();
				date.setDay(day);
			} else if (operation == 2) {
				int month = sc.nextInt();
				date.setMonth(month);
			} else if (operation == 3) {
				int year = sc.nextInt();
				date.setYear(year);
			} else if (operation == 4) {
				int day = sc.nextInt();
				int month = sc.nextInt();
				int year = sc.nextInt();


				date.setDate(day, month, year);
			} else if (operation == 5) {
				System.out.println(date.getDay());
			} else if (operation == 6) {
				System.out.println(date.getMonth());
			} else if (operation == 7) {
				System.out.println(date.getYear());
			} else if (operation == 8) {
				System.out.println(date.toString());
			} else if (operation == 9) {
				System.out.println(date.dayOfTheWeek());
			}
		}
	}
}