如图打印如下日历图片
有兴趣的话，建议读者构建一个思维导图，以方便生成解决方案
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package printcalendar; import java.util.Scanner; /** * * @author Hacker.ST.Tan */ public class PrintCalendar { /** * @param args the command line arguments */ public static void main(String[] args) { // TODO code application logic here Scanner input = new Scanner(System.in); System.out.print("Enter full year (e.g., 2017):"); int year = input.nextInt(); System.out.print("Enter month as a number between 1 and 12:"); int month = input.nextInt(); print12(year, month); } //打印至month開始之後的所有月份的日曆 public static void print12(int year, int month) { for (int month1 = month; month1 <= 12; ++month1) { printMonth(year, month1); } } //答應日曆函數 public static void printMonth(int year, int month) { printMonthTitle(year, month); printMonthBody(year, month); } //打印標題 public static void printMonthTitle(int year, int month) { System.out.println(" " + getMonthName(month) + " " + year); System.out.println("-----------------------------"); System.out.println(" Sun Mon Tue Wed Thu Fri Sat"); } //確定輸入的月份 public static String getMonthName(int month) { String monthName = ""; switch (month) { 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 = "October"; break; case 11: monthName = "November"; break; case 12: monthName = "December"; } return monthName; } //打印日曆的主體 public static void printMonthBody(int year, int month) { int startDay = getStartDay(year, month); int numberOfDaysInMonth = getNumberOfDaysInMonth(year, month); int i = 0; for (i = 0; i < startDay; ++i) { System.out.print(" "); } for (i = 1; i <= numberOfDaysInMonth; ++i) { System.out.printf("M", i); if ((i + startDay) % 7 == 0) { System.out.println(); } } System.out.println(); } public static int getStartDay(int year, int month) { final int START_DAY_FOR_JAN_1_1800 = 3;//1800/1/1是星期三 int totalNumberOfDays = getTotalNumberOfDays(year, month); return (totalNumberOfDays + START_DAY_FOR_JAN_1_1800) % 7; } //獲得1800/1/1距今日是多少天，因為已知18001/1是星期三 public static int getTotalNumberOfDays(int year, int month) { int total = 0; for (int i = 1800; i < year; ++i) { if (isLeapYear(i)) { total = total + 366; } else { total = total + 365; } } for (int i = 1; i < month; ++i) { total = total + getNumberOfDaysInMonth(year, i); } return total; } //獲得month的天數，即month是31天還是30天，還是29或28天 public static int getNumberOfDaysInMonth(int year, int month) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { return 31; } if (month == 4 || month == 6 || month == 9 || month == 11) { return 30; } if (month == 2) { return isLeapYear(year) ? 29 : 28; } return 0; } //判斷是否為閏年 public static boolean isLeapYear(int year) { return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0); } }
