DEVELOP A DATE CLASS [ java ]

DEVELOP A DATE CLASS

AIM:

            To write a java program to develop a date class.

ALGORITHM:

           

1. Declare all the required variables.

            2, In date constructor check we give the valid date or not.If not valid date display the                       exception else get the input.

            3. In the invalid function check whether the month,days are valid or not.

            4  In the leap year function check whether the year is leap or not.

            5  Use toString method convert the object to string .

            6. In the main function call the corresponding function by creating the object and then                     display the result.

PROGRAM:

import java.io.*;

import java.util.*;

public class Date

{

            private final int month;

            private final int day;

            private final int year;

            public Date(int m,int d,int y)

            {

                        if(!isValid(m,d,y))throw new RuntimeException("Invalid");

                        month=m;

                        day=d;

                        year=y;

            }

            private static boolean isValid(int m,int d,int y)

            {

                        int[] DAYS={0,31,29,31,30,31,30,31,31,30,31,30,31};

                        if(m<1||m>12)return false;

                        if(d<1||d>DAYS[m])return false;

                        if(m==2 && d==29 && !isLeapYear(y))return false;

                        return true;

            }

    private static boolean isLeapYear(int y)

    {

            if(y%400==0)return true;

            if(y%100==0)return false;

            return(y%4==0);

    }

    public Date next()

    {

            if(isValid(month,day+1,year))return new Date(month,day+1,year);

            else if(isValid(month+1,1,year))return new Date(month+1,1,year);

            else return new Date(1,1,year+1);

    }

    public String toString()

    {

            return month+"-"+day+"-"+year;

    }

    public static void main(String[] args)

    {

            try

            {

                        InputStreamReader isr=new InputStreamReader(System.in);

                        BufferedReader bf=new BufferedReader(isr);

                        System.out.println("Enter month,date and year in the format mm/dd/yyyy");

                        String d=bf.readLine();

                        int da[]=new int[3];

                        String str1[]=new String[3];

                        str1=d.split("/");

                        for(int i=0;i<3;i++)

                        {

                                    da[i]=Integer.parseInt(str1[i]);

                        }

                        Date today=new Date(da[0],da[1],da[2]);

                        System.out.println(today);

                        Date nextDate=today.next();

                        System.out.println(nextDate);

            }

            catch(Exception e)

            {

                        System.out.println(e);

            }

    }

}

OUTPUT:

Enter month,Date,year in the format mm//dd/yyy

12/31/2000

12-31-2000

1-1-2001

RESULT:
            Thus the java program to develop a date class was implemented