10- Java Date and Time.java

/*
Problem statement:
https://www.hackerrank.com/challenges/java-date-and-time/problem?isFullScreen=true

Problem
You are given a date. You just need to write the method, getDay, which returns the day on that date. To simplify your task, we have provided a portion of the code in the editor.

Example
month = 8 day = 14 year = 2017

The method should return MONDAY as the day on that date.

Function Description
Complete the findDay function in the editor below.

findDay has the following parameters:
int: month
int: day
int: year
Returns
string: the day of the week in capital letters

Input Format
A single line of input containing the space separated month, day and year, MM DD YYYY respectively, in format.

Constraints
2000 <= year <= 3000

Sample Input
 08 05 2015
 
Sample Output
 WEDNESDAY
 
Explanation
The day on August 15th 2015 was WEDNESDAY.

*/

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'findDay' function below.
     *
     * The function is expected to return a STRING.
     * The function accepts following parameters:
     *  1. INTEGER month
     *  2. INTEGER day
     *  3. INTEGER year
     */

    public static String findDay(int month, int day, int year) {
      // my code
        Calendar gc = new GregorianCalendar (year, month-1, day);
        String dayOfWeek = gc.getDisplayName(Calendar.DAY_OF_WEEK, Calendar.LONG, Locale.US).toUpperCase();
        return dayOfWeek;
                
    }
}


public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        String[] firstMultipleInput = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        int month = Integer.parseInt(firstMultipleInput[0]);

        int day = Integer.parseInt(firstMultipleInput[1]);

        int year = Integer.parseInt(firstMultipleInput[2]);

        String res = Result.findDay(month, day, year);

        bufferedWriter.write(res);
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}