HR자바 Java Date and Time

개요

HR자바 Java Date and Time

• https://www.hackerrank.com/challenges/java-date-and-time/problem

해커랭크 Java

#	문제	비고
HR자바 Introduction e
1	HR자바 Welcome to Java!
2	HR자바 Java Stdin and Stdout I
3	HR자바 Java If-Else
4	HR자바 Java Stdin and Stdout II
5	HR자바 Java Output Formatting
6	HR자바 Java Loops I
7	HR자바 Java Loops II
8	HR자바 Java Datatypes
9	HR자바 Java End-of-file
10	HR자바 Java Static Initializer Block
11	HR자바 Java Int to String
12	HR자바 Java Date and Time
13	HR자바 Java Currency Formatter

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상단

import java.util.Scanner;

구현예시 1

import java.time.LocalDate;

public class Solution {
    static String getDay(String day, String month, String year) {
        int d = Integer.parseInt(day);
        int m = Integer.parseInt(month);
        int y = Integer.parseInt(year);
        return LocalDate.of(y,m,d).getDayOfWeek().toString();
    }

구현예시 2

import java.util.Calendar;
import java.text.DateFormatSymbols;

public class Solution {
    static String getDay(String day, String month, String year) {
        int d = Integer.parseInt(day);
        int m = Integer.parseInt(month);
        int y = Integer.parseInt(year);
        Calendar cal = Calendar.getInstance();
        cal.set(y, m-1, d);
        String[] weekdays = new DateFormatSymbols().getWeekdays();
        return weekdays[cal.get(Calendar.DAY_OF_WEEK)].toUpperCase();
    }

하단

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String month = in.next();
        String day = in.next();
        String year = in.next();
        
        System.out.println(getDay(day, month, year));
    }
}