简述思路
接收键盘数据得到年份和月份，判断是否为闰月，若为将2月天数改为29天利用Calendar类找到该月份1号是周几打印日历，逢7换行
package day8;import java.util.Calendar;import java.util.Scanner;/*** @Author JiaWen* @Date /4/12 10:09* @PackageName:day8* @ClassName: CalendarTest* @Description:输入年份和月份，输出该月日历。* @Version 1.0*/public class CalendarTest {private static Scanner scanner = new Scanner(System.in);private static int year;private static int month;private static final int[] MONTHS = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};//月份天数数组public static void main(String[] args) {getValue();showCalendar(year, month);}private static void getValue() {System.out.print("请输入年份:");year = scanner.nextInt();while (year > 3000 || year < 1900) {System.out.println("年份有误,请重新输入：");year = scanner.nextInt();}if (isLeap(year)) {//是闰年2月变为29天MONTHS[1] = 29;}System.out.print("请输入月份:");month = scanner.nextInt();while (month > 12 || year < 0) {System.out.println("月份有误,请重新输入：");year = scanner.nextInt();}scanner.close();}private static void showCalendar(int year, int month) {int count = 0;//计数器，用于记录每行数据个数int monthIndex = month - 1;//真实月份-1得下标System.out.println("日" + "\t" + "一" + "\t" + "二" + "\t" + "三" + "\t" +"四" + "\t" + "五" + "\t" + "六" + "\t");Calendar calendar = Calendar.getInstance();calendar.set(Calendar.YEAR, year);//设置年calendar.set(Calendar.MONTH, monthIndex);//设置月calendar.set(Calendar.DAY_OF_MONTH, 1);//设置为月份的1号int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);//1号为星期几，注意星期日是1，星期六是7for (int i = 0; i < dayOfWeek - 1; i++) {//打印第一行System.out.print("\t");count++;}for (int i = 1; i <= MONTHS[monthIndex]; i++) {System.out.print(i);count++;if (count == 7) {//满7换行System.out.println();count = 0;continue;}System.out.print("\t");}}private static boolean isLeap(int year) {if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {return true;} else {return false;}}}
