练习：可视化日历（时间处理相关类）

package cn.bjsxt.dateclass;

import java.security.SignatureException;
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;

/**
 * 可视化日历程序
 * 
 * @author Administrator
 *
 */
public class VisualCalendar {
    public static void main(String[] args) {
        System.out.println("请输入日期，按照格式:(2030-3-10)");
        Scanner scanner = new Scanner(System.in);
        String temp = scanner.nextLine();
        
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        try {
            Date date = format.parse(temp);
            Calendar calendar = new GregorianCalendar();
            calendar.setTime(date);
            int day = calendar.get(Calendar.DATE);
            calendar.set(Calendar.DATE,1);
//            //每个月的日期是 周几
//            System.out.println(calendar.get(Calendar.DAY_OF_WEEK));
//            //每月的最大天数
//            System.out.println(calendar.getActualMaximum(Calendar.DATE));
            
            int maxDate = 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<=maxDate;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.print('\n');
                }
                calendar.add(Calendar.DATE, 1);
            }
            
        } catch (ParseException e) {
            
            e.printStackTrace();
        }
    }
}