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");
}
}
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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