方法调用-万年历案例

方法调用：万年历

将万年历实现的各个功能封装成独立的功能模块，便于功能的扩展和可读性增强

代码

import java.util.Scanner;
public class Test03{
	public static void main(String [] args){
		/**
			方法版 ，万年历
		*/
		Scanner sc = new Scanner(System.in);
		System.out.println("请您输入年：");
		int year = sc.nextInt();
		System.out.println("请您输入月：");
		int month = sc.nextInt();

		int allAay= getDay(1900,year,1,month);
		int week = getWeek(allAay);
		int day = getDayOfMonth(year,month);
		printCalendar(year,month,week,day);
	}

	//打印日历
	public static void printCalendar(int year,int month,int week,int day){
		
		System.out.println(year+"年"+month+"月");
		System.out.println("一\t二\t三\t四\t五\t六\t七");
		
		int count = 0; //记录打印列数，到7换行
		for(int i = 1;i<week;i++){
			System.out.print("\t");
			count++;
		}
		for(int i =1;i<=day;i++){
			System.out.print(i+"\t");
			count++;
			if(count%7 ==0){
				System.out.println("\n");
			}
		}
	}
	

	//获取周几
	public static int getWeek(int allDay){
		int week = allDay%7+1;
		if(week == 0){
			week = 7;
		}
		return week;
	}
	
	//获取总天数
	public static int getDay(int startYear,int endYear,int startMonth,int endMonth){
		int allDay = dayOfYear(startYear,endYear)+dayOfMonth(endYear,startMonth,endMonth);
		return allDay;
	}
		
	
	//获取年差天数
	public static int dayOfYear(int startYear,int endYear){
		int allDayOfYear = 0;
		for(int i = startYear ; i<endYear;i++){
			if(isLeap(i)){
				allDayOfYear += 366;
			}else{
				allDayOfYear += 365;
			}
		}
		return allDayOfYear;
	}
	
	
	//获取月差天数
	public static int dayOfMonth(int year,int startMonth,int month){
		int dayOfMonth = 0;
		for(int i=startMonth;i<month;i++){
			dayOfMonth = getDayOfMonth(year,i);
		}
		return dayOfMonth;
	}
	
	
	//获取当月天数
	public static int getDayOfMonth(int year,int month){
		int getDayOfMonth = 0;
		switch(month){
			case 1 :case 3:case 5:case 7:case 8:case 10:case 12:
				getDayOfMonth += 31;
				break;
			case 4:case 6:case 9:case 11:
				getDayOfMonth += 30;
				break;
			case 2 :
				if(isLeap(year)){
					getDayOfMonth += 29;
				}else{
					getDayOfMonth += 28;
				}
		}
		return getDayOfMonth;
	}
	
	//判断是否闰年
	public static boolean isLeap(int year){
		if(year%4==0 && year%100 != 0 || year%400==0){
			return true;
		}else{
			return false;
		}
	}
}

效果