如何显示一个日历/Java

二、具体代码

1.确定每个月的月历显示

代码如下：

public static int calendar(int first,int month,int year) {
		int day = 0;
		System.out.print("			"+month);
		System.out.println("                           2021");
		System.out.printf("     ---------------------------------------------------\n");
		System.out.printf("%8s%8s%8s%8s%8s%8s%8s\n","Sun","Mon","Tue","Wed","Thu","Fri","Sat");
		if(month ==1||month == 3||month == 5||month==7||month ==8||month == 10||month == 12)
		{
			day = 31;
		}
		if(month ==4||month==6||month ==9||month==11)
		{
			day = 30;
		}
		if(month ==2)
		{
			if(year%4==0&&year%100!=0||year%400==0)
			{
				day = 29;
				
				}
			else {

				day = 28;
			}
		}
		for(int j = 0;j<first;j++)
		{
			System.out.print("\t");
		}
		for(int i = 1;i<=day;i++) {
			if((i+first)%7!=0)
			{
				System.out.printf("%8d",i);
			}
			else {
				System.out.printf("%8d\n",i);
			}
		}
		
		return 0;
	}
		

2.确定该月处到1月1日的时间距离

代码如下：

public static int Numberofmonth(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)
		{
			if(year%4==0&&year%100!=0||year%400==0)
			{
				return  29;
				
				}
			else {

				return 28;
			}
		}
		return 0;
		
	}

3.全部代码

代码如下：

import java.time.DayOfWeek;

import javax.*;

public class elapsed_time 
{
	public static void main(String[] args) {
		//2021年9月1日到1月1日的距离
		//1月1日是星期五
		int t = 5;
		int year =2021;
		int month = 9;
		int day = 0;
		int d = 0;//月初是星期几
		/*
		 * 如果要计算1800年到现在的情况的话,就是(2021-1800)*12+month
		*/
		for(int i = 1;i<month;i++)
		{
			day+=Numberofmonth(2021,i);
		}
		
		d = (day+t)%7;
		
		calendar(d, month,2021);
		
		
				
	}
	public static int Numberofmonth(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)
		{
			if(year%4==0&&year%100!=0||year%400==0)
			{
				return  29;
				
				}
			else {

				return 28;
			}
		}
		return 0;
		
	}
	public static int calendar(int first,int month,int year) {
		int day = 0;
		System.out.print("			"+month);
		System.out.println("                           2021");
		System.out.printf("     ---------------------------------------------------\n");
		System.out.printf("%8s%8s%8s%8s%8s%8s%8s\n","Sun","Mon","Tue","Wed","Thu","Fri","Sat");
		if(month ==1||month == 3||month == 5||month==7||month ==8||month == 10||month == 12)
		{
			day = 31;
		}
		if(month ==4||month==6||month ==9||month==11)
		{
			day = 30;
		}
		if(month ==2)
		{
			if(year%4==0&&year%100!=0||year%400==0)
			{
				day = 29;
				
				}
			else {

				day = 28;
			}
		}
		for(int j = 0;j<first;j++)
		{
			System.out.print("\t");
		}
		for(int i = 1;i<=day;i++) {
			if((i+first)%7!=0)
			{
				System.out.printf("%8d",i);
			}
			else {
				System.out.printf("%8d\n",i);
			}
		}
		
		return 0;
	}
		

}

运行结果

这是我的一个博客，希望以后继续坚持。