java date例子 日历

import java.util.*;
import java.text.*;

    public class MyCalendar {

        public static void main(String[] args) {
            myCalendar();
        }

        public static void myCalendar() {
            int lastDay=0,firstDay=0,currentDay=0;
            System.out.println("请输入一个日期：格式为：yyyy-MM-dd");
            Scanner scanner = new Scanner(System.in);
            String str = scanner.nextLine();
            try {
                DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                Date date = format.parse(str);
                Calendar calendar = Calendar.getInstance();
                calendar.setTime(date);

                lastDay = calendar.getActualMaximum(Calendar.DATE);	//当前日期中当前月对应的最大天数
                currentDay = calendar.get(Calendar.DATE);	//当前日期中的当前天
                calendar.set(Calendar.DATE, 1); // 设置为当前月的第一天
                firstDay = calendar.get(Calendar.DAY_OF_WEEK);	//第一天对应的星期数

            } catch (ParseException e) {
                e.printStackTrace();
            }

            System.out.println("日\t一\t二\t三\t四\t五\t六\n");
            for (int j = 1; j < firstDay; j++) {
                System.out.print("\t");
            }

            for (int i = 1; i <= lastDay; i++) {
                if (i == currentDay) {
                    System.out.print("#");
                }
                System.out.print(i + "\t");
                if ((i - (8 - firstDay)) % 7 == 0) {
                    System.out.println("\n");
                }
            }
        }
    }