利用Java编写一个属于自己的日历

//得到一个Calendar对象

Calendar c = Calendar.getInstance();

//设置日期为当前月份的第一天,由于时区的原因，month-1,get(java.util.Calendar.DAY_OF_WEEK) - 1

c.set(year, month - 1 , 1 );

//求出第一天是星期几

int FirstDayInWeek = c.get(Calendar.DAY_OF_WEEK) - 1 ;

//导入相关包

import java.util.Scanner;

import java.util.Calendar;

public class MyCalendar {

     public static void main(String[] args) {

         //保存用户输入的年份

         int year;

         //保存每个月的天数

         int days = 0 ;

         //保存月份

         String[] months;

         months = new String[ 13 ];

         months[ 1 ] = "January" ;

         months[ 2 ] = "February" ;

         months[ 3 ] = "March" ;

         months[ 4 ] = "April" ;

         months[ 5 ] = "May" ;

         months[ 6 ] = "June" ;

         months[ 7 ] = "July" ;

         months[ 8 ] = "August" ;

         months[ 9 ] = "September" ;

         months[ 10 ] = "October" ;

         months[ 11 ] = "November" ;

         months[ 12 ] = "December" ;

         //接受用户输入的年份

         Scanner in = new Scanner(System.in);

         System.out.print( "Please input years:" );

         year = in.nextInt();

         //得到一个Calendar对象

         Calendar c = Calendar.getInstance();

         //循环 12 个月

         for ( int month = 1 ; month <= 12 ; month++) {

             //标题

             System.out.println( "\n  Month's name is " + months[month]);

             for ( int i = 1 ; i <= 27 ; i++) System.out.print( "=" );

             System.out.println( "\nSun\tMon\tTue\tWed\tThu\tFri\tSat" );

             // 判断当前月份的天数

             if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12 ) {

                 days = 31 ;

             }

             if (month == 4 || month == 6 || month == 9 || month == 11 ) {

                 days = 30 ;

             }

             if (month == 2 ) {

                 //闰年判断

                 if (((year % 4 == 0 ) && (year % 100 != 0 )) || (year % 400 == 0 )) {

                     days = 29 ;

                 } else {

                     days = 28 ;

                 }

             }

             //设置日期为当前月份的第一天,由于时区的原因，month-1,get(java.util.Calendar.DAY_OF_WEEK) - 1

             c.set(year, month - 1 , 1 );

             //求出第一天是星期几

             int FirstDayInWeek = c.get(Calendar.DAY_OF_WEEK) - 1 ;

             //用来控制换行

             int cnt = 0 ;

             //前面的空位

             for ( int j = 0 ; j < FirstDayInWeek; j++) {

                 System.out.print( "    " );

                 cnt++;

             }

             //打印当前月份日历

             for ( int i = 1 ; i <= days; i++) {

                 if (cnt == 7 ) {

                     System.out.printf( "\n" );

                     cnt = 0 ;

                 }

                 System.out.printf( "%-4d" , i);

                 cnt++;

             }

             System.out.print( "\n" );

         }

     }

}