本文实例讲述了Java实现按年月打印日历功能。分享给大家供大家参考,具体如下:
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import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; public class CalendarBook { public static void main(String[] args) throws ParseException { CalendarBook cb = new CalendarBook(); cb.printWeekTitle(); cb.printCalendar( 2018 , 3 ); } public void printCalendar( int year, int month) throws ParseException { String monthStr; // 格式化月份,因为要转成yyyyMMdd格式的 if (month < 10 ) { monthStr = "0" + month; } else { monthStr = month + "" ; // 数字跟字符串拼接转成字符串格式 } String yearMonthStr = year + monthStr; SimpleDateFormat sdf = new SimpleDateFormat( "yyyyMMdd" ); Calendar calendarEnd = Calendar.getInstance(); Calendar calendarStart = Calendar.getInstance(); // 根据年份和月份得到输入月份有多少天 int monthDays = getMonthLastDay(year, month); // 月初的date字符串 String dateStartStr = yearMonthStr + "01" ; // 月末的date字符串 String dateEndStr = yearMonthStr + monthDays; Date startDate = sdf.parse(dateStartStr); Date endDate = sdf.parse(dateEndStr); calendarStart.setTime(startDate); calendarEnd.setTime(endDate); // 得到输入月份有多少周 int weeks = calendarEnd.get(Calendar.WEEK_OF_MONTH); // 得到当月第一天是星期几,这里周日为第一天,从1开始,周一则为2 int dayOfWeek = calendarStart.get(Calendar.DAY_OF_WEEK); int day = 1 ; // 当月的第一周做特殊处理,单独打印一行 for ( int i = 1 ; i <= 7 ; i++) { if (i >= dayOfWeek) { System.out.print( " " + day + " " ); day++; } else { System.out.print( " " ); } } System.out.println(); // 开始打印从第二周开始的日期 for ( int week = 1 ; week < weeks; week++) { for ( int i = 1 ; i <= 7 ; i++) { if (day > monthDays) { break ; } if (day < 10 ) { System.out.print( " " + day + " " ); } else { System.out.print(day + " " ); } day++; } System.out.println(); } } public int getMonthLastDay( int year, int month) { int monthDay; int [][] day = { { 0 , 31 , 28 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31 }, { 0 , 31 , 29 , 31 , 30 , 31 , 30 , 31 , 31 , 30 , 31 , 30 , 31 } }; if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0 ) { // 闰年 monthDay = day[ 1 ][month]; } else { monthDay = day[ 0 ][month]; } return monthDay; } public void printWeekTitle() { System.out.println( "日" + " " + "一" + " " + "二" + " " + "三" + " " + "四" + " " + "五" + " " + "六" ); } } |
运行结果截图(运行效果,字体大小5号最佳):
希望本文所述对大家java程序设计有所帮助。
原文链接:http://blog.csdn.net/lizonghuan/article/details/50172763