打印日历

来源：互联网发布：罗马帝国知乎编辑：程序博客网时间：2024/05/22 13:54
这篇的算法是打印日历，可能对许多小伙伴来说有点困难，但是，笔者还是想让大家硬着头皮看完，毕竟，学会这个算法之后，小伙伴们就不用买日历了~~~好了，一起来看代码
package printdate;import java.util.Scanner;/** * 编写一个程序，显示给定年月的日历。 * * Created by 郑文华 on 2017/6/1. */public class PrintCalendar {    public static void main(String[] args){        Scanner input = new Scanner(System.in);        //输入年份        System.out.println("please enter full year(eg.2000)");        int year = input.nextInt();        //输入月份        System.out.println("enter mouth between 1 and 12");        int month = input.nextInt();        //调用函数，打印日历        printCalender(year,month);    }    /**     * 打印指定年份月份的日历     * @param year 年份     * @param month 月份     */    public static void printCalender(int year,int month){        //打印日历的头部        printTitle(year,month);        //打印日历的主体部分        printBody(year,month);    }    /**     * 打印日历的头部     * @param year     * @param month     */    public static void printTitle(int year, int month){        System.out.println("         " + getMonth(month) + "  " + year);        System.out.println("-------------------------------");        System.out.println("  Sun   Mon  Tue   Wed  Thu  Fri Sat ");    }    /**     * 获得日历的英文名称     * @param mouth     * @return     */    public static String getMonth(int mouth){        String monthName = " ";        switch (mouth){            case 1:                monthName = "January"; break;            case 2:                monthName = "February";break;            case 3:                monthName = "March";break;            case 4:                monthName = "April";break;            case 5:                monthName = "May";break;            case 6:                monthName = "June";break;            case 7:                monthName = "July";break;            case 8:                monthName = "August";break;            case 9:                monthName = "September";break;            case 10:                monthName = "Octomber";break;            case 11:                monthName = "November";break;            case 12:                monthName = "December";        }        return monthName;    }    /**     * 打印日历的主体部分     * @param year     * @param month     */    public static void printBody(int year,int month){        //计算该月的第一天是星期几        int startDay = getStartDays(year,month);        //计算该月总共的天数        int numberOfDaysInMonth = getNumberOfDaysInMonth(year,month);        //计算起始位置需要留出的空白地方        int i ;        for( i = 0; i < startDay; i++) {            System.out.print("     ");        }        for( i = 1; i <= numberOfDaysInMonth; i++){            System.out.printf("%5d",i);            //是否需要换行            if((i + startDay) % 7 == 0){                System.out.println();            }        }    }    /**     * 获得该月的起始位置     * @param year     * @param month     */    public static  int getStartDays(int year, int month){        //以1800年1月1日星期三为基准的日历        final int START_DAY_FOR_JAN_1_1800 = 3;        //计算现在的月份和基准时间的相差天数        int totalNumberOfDays = getTotalNumberOfDays(year,month);        //返回起始的星期        return (totalNumberOfDays + START_DAY_FOR_JAN_1_1800) % 7;    }    /**     * 计算和基准时间的相差天数     * @param year     * @param month     * @return     */    public static int getTotalNumberOfDays(int year,int month){        int total = 0;        //获取该年距离基准时间总共的天数        for(int i = 1800; i < year; i++){            //判断是否为闰年            if(isLeapYear(i)){                total = total + 366;            }            else {                total = total + 365;            }        }        //获得该年份至要打印月份的总共天数        for(int i = 1; i < month; i++){            total = total + getNumberOfDaysInMonth(year,i);        }        return total;    }    /**     * 获得每月的天数     * @param year     * @param month     * @return     */    public static int getNumberOfDaysInMonth(int year,int month){        if(month == 1 || month == 3 || month == 5 || month == 7 || month == 7 || month == 8 || month == 10 || month == 13 ){            return  31;        }        if(month == 4 || month == 6 || month == 9 || month == 9 || month == 11){            return  30;        }        if(month == 2){            return  isLeapYear(year) ? 29 : 28;        }        return  0;    }    public static boolean isLeapYear(int year){        return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);    }}</font>
阅读全文
1 0