달력만들기

import java.util.Calendar;

import java.util.Scanner;

 

public class Calendars {

    // 스캐너 클래스 정적 메모리 영역에 올림.

    static Scanner scanner;

 

    public static void main(String args[]) {

        // year(년) mon(월) date(날짜) i(for문시 사용되는) 변수 생성

        int year, month, date, i;

        Calendar calendar = Calendar.getInstance();

 

        int startDay; // 월 시작 요일

        int lastDay; // 월 마지막 날짜

        int inputDate = 1; // 입력 날짜

    

        // Scanner클래스 객체생성

        scanner = new Scanner(System.in);

        // 무한루프 참일경우 루프문을 계속 수행하고 루프문이 거짓이면 루프를 빠져나감

        while (true) {

            System.out.print("연도를 입력하세요(1900년 이후) : ");

            year = scanner.nextInt();

            // 년도가 1900년 미만으로 입력하면 프로그램을 종료한다.

            if (year < 1900) {

                System.out.println("1900년 이전 년도 입니다. 다시 실행하세요.");

                System.exit(0);

            }

            System.out.print("월을 입력하세요(1~12월) : ");

            month = scanner.nextInt();

 

            // Calendar에 년,월,일 셋팅

            calendar.set(Calendar.YEAR, year);

            calendar.set(Calendar.MONTH, month-1);

            calendar.set(Calendar.DATE, 1);

            startDay = calendar.get(Calendar.DAY_OF_WEEK); // 월 시작 요일

            lastDay = calendar.getActualMaximum(Calendar.DATE); // 월 마지막 날짜

 

            System.out.println();

            System.out.println("" + year + "년 " + month + "월 달력입니다.");

            System.out.println("------------------------------------------------------------");

            System.out.printf("일\t월\t화\t수\t목\t금\t토\n");

            System.out.println("------------------------------------------------------------");

            int weekday = startDay-1 % 7;

            for (i = 0; i < weekday; i++) {

                System.out.print("\t" + "");

            }

 

            for (int j = 1; j <= lastDay; j++) {

                if (j%7==0) {

                    System.out.println();

                }

                System.out.printf("%d\t", j); // 요일이 토요일이면 다음칸으로 옮겨야 하니까

            

 

            }

 

            System.out.println("\n-----------------------------------------------------\n");

            System.exit(0);

 

        }

    }

 

}