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  • 日历 练习

    import java.util.*;
    
    public class Calendar {
        int year = 0;
        int month = 0;
        int sum = 0;
        int weekday;
        int monthday = 0;
    
        public void check() {
            System.out.println("先输入年份:");
            Scanner sc = new Scanner(System.in);
            int year = sc.nextInt();
            if (year < 1990 || year > 2100) {
                System.out.println("输入非法");
                return;
            }
            System.out.println("在输入月份:");
            int month = sc.nextInt();
            if (month < 1 || month > 12) {
                System.out.println("输入非法");
                return;
            }
            for (int i = 1990; i < year; i++) {
                if ((i % 4 == 0 && i % 100 != 0) || i % 400 == 0) {
                    sum += 366;
                } else {
                    sum += 365;
                }
            }
            for (int i = 1; i < month; i++) {
                if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
                    if (i == 2) {
                        sum += 29;
                    } else if (i == 4 || i == 6 || i == 9 || i == 11) {
                        sum += 30;
                    } else {
                        sum += 31;
                    }
                } else {
                    if (i == 2) {
                        sum += 28;
                    } else if (i == 4 || i == 6 || i == 9 || i == 11) {
                        sum += 30;
                    } else {
                        sum += 31;
                    }
                }
    
            }
            weekday = (sum += 1) % 7;
            // System.out.println(weekday);
            System.out.println("日	一	二	三	四	五	六");
            for (int i = 0; i <= weekday; i++) {
                if (i == weekday) {
                    System.out.print("1	");
                    if (sum % 7 == 6) { // 余数得6的为周六,换行
                        System.out.print("
    ");
                    }
                    sum += 1;
                    break;
                }
                System.out.print("	");
            }
            if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {// 是否为闰年
                if (month == 2) {
                    monthday = 29;
                }
    
                else if (month == 4 || month == 6 || month == 9 || month == 11) {
    
                    monthday = 30;
                } else {
                    monthday = 31;
                }
            } else {
                if (month == 2) {
                    monthday = 28;
                } else if (month == 4 || month == 6 || month == 9 || month == 11) {
    
                    monthday = 30;
                } else {
                    monthday = 31;
                }
    
            }
            for (int i = 2; i <= monthday; i++) {
                if (sum % 7 == 6) { // 余数得6的为周六,换行
                    System.out.print(i + "
    ");
                    sum += 1;
                } else {
                    System.out.print(i + "	");
                    sum += 1;
                }
            }
        }
    }

    基础差这点东西搞好久

    主要区分平年闰年,算1990至查询月份的1号共多少天    天数%7   模为1号的星期数,并且打印时周六(天数%7模为6的)换行

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  • 原文地址:https://www.cnblogs.com/mimimimimi/p/4099331.html
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