打印某个年月的日历

最新推荐文章于 2021-12-05 21:42:14 发布

原创最新推荐文章于 2021-12-05 21:42:14 发布 · 538 阅读

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这篇博客记录了一位编程新手的学习经历，分享了如何编写程序来展示特定年月的日历。通过这个过程，作者探讨了日期处理的基本概念和编程技巧，对于其他初学者来说是一个很好的参考。

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编程小白学习之路，供参考

import java.util.Scanner;

/**
 * 输入年，月，打印该月的日历
 * 采用自顶向下设计，自下向上实现的方法
 *TODO
 * @author swjtu
 * @project JavaTest3
 * @date 2019年3月28日
 * @remarks TODO
 */
public class PrintCalender {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int year,month;
		System.out.print("请输入打印年份：");
		year = input.nextInt();
		System.out.print("请输入打印月份：");		
		month = input.nextInt();
		printMonth(year,month);

	}
	
	public static void printMonth(int year,int month) {
		printMonthTitle(year,month);
		printMonthBody(year,month);
	}
	//打印日历的标题
	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");
	}
	//打印日历主体
	public static void printMonthBody(int year,int month) {
		int startDay= getStartDay(year,month);
		int dayOfMonth = getNumberOfDaysInmonth(year,month);
		for (int i = 0; i < startDay; i++) {
			System.out.printf("    ");
		}
		for (int j = 1; j <=dayOfMonth; j++) {
			System.out.printf("%-4d",j);
			if((j+startDay)%7==0)
				System.out.println();
		}
		System.out.println();
	}
	//返回月份的名字
	public static String getMonthName(int month) {
		String monthName="";
		switch (month) {
		case 1:
			monthName="January";
			break;
		case 2:
			monthName="Febuary";
			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="Deceber";
			break;

		default:
			break;
		}
		return monthName;
	}
	//返回一个月的第一天星期几
	public static int getStartDay(int year,int month) {
		final int StartDay_1800=3;
		int startDay;
		startDay=(getTotalNumberOfDays(year,month)+StartDay_1800)%7;
		return startDay;
	}
	//返回现在到1800.1.1的总天数
	public static int getTotalNumberOfDays(int year,int month) {
		int totalNumberOfDays=0;
		for (int year1 = 1800; year1 < year; year1++) {
			if(isLeapyear(year1))
				totalNumberOfDays+=366;
			else
				totalNumberOfDays+=365;
		}
		for (int month1 =1; month1 < month; month1++) {
			totalNumberOfDays+=getNumberOfDaysInmonth(year,month1);
		}
		return totalNumberOfDays;
		
	}
	//返回每个月份的天数
	public static int getNumberOfDaysInmonth(int year,int month) {
		int day;
		if(month==1||month==3||month==5||month==7||month==8||month==10||month==12) {
			day=31;
			return 31;
		}
		else if(month==4||month==6||month==9||month==11) {
			day=30;
			return day;
		}
		else if(month==2&&isLeapyear(year))
			return 29;
		else
			return 28;
			
	}
	//判断是不是闰年
	public static boolean isLeapyear(int year) {
		if(year%400==0||(year%4==0&&year%100!=0))
			return true;
		return false;
	}

}