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
