简单的java编程（练手），日历的制作

package com.company;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        System.out.println("请输入如期（格式如：2018-04-02）");
        Scanner scanner = new Scanner(System.in);
        String temp = scanner.nextLine();
        DateFormat dateformat = new SimpleDateFormat("yy-MM-dd");
        try {
            Date date = dateformat.parse(temp);
            Calendar calendar = new GregorianCalendar();
            calendar.setTime(date);
            int day = calendar.get(Calendar.DATE);
            calendar.set(Calendar.DATE,1);


            System.out.println(date);
            System.out.println(calendar.get(Calendar.DAY_OF_WEEK));
            System.out.println(calendar.getActualMaximum(Calendar.DATE));
            System.out.println("日\t一\t二\t三\t四\t五\t六");
            for (int i=1;i<calendar.get(Calendar.DAY_OF_WEEK);i++){
                System.out.print("\t");
            }
            for (int i=1;i<=calendar.getActualMaximum(Calendar.DATE);i++){
                if (i==day){
                    System.out.print("*");
                }
                System.out.print(i+"\t");
                int w = calendar.get(Calendar.DAY_OF_WEEK);
                if (w==Calendar.SATURDAY){
                    System.out.println();
                }
                calendar.add(Calendar.DATE,1);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }

    }
}