【每日日报】第七天

1 今日任务日期类

 题目要求：

 

 程序源代码：

package Date1;

import java.util.Scanner;

public class Date1 {
 int[]  monthDay={31,28,31,30,31,30,31,31,30,31,30,31};
 String[]  weekName={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
 String[]  monthName={"Jan","Feb","Mar","Api","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
 public static void main(String[] args){
  int year,month,day;
     Date1 d1 = new Date1();
     Date1 d2 = new Date1(d1);
     Scanner input = new Scanner(System.in);
     year = input.nextInt();
     month = input.nextInt();
     day = input.nextInt();
     d1.setYear(year);
     d1.setMonth(month);
     d1.setDay(day);
     d1.yesterday();
     d1.chineseFormat();
     year = input.nextInt();
     month = input.nextInt();
     day = input.nextInt();
     d2.setYear(year);
     d2.setMonth(month);
     d2.setDay(day);
     d2.tomorrow();
     d2.americaformat();
     d2.printMonthCalendar();
     input.close();
 }
     int year,month,day;
     Date1()
     {
      System.out.println("Constructor run");
     }
     Date1(Date1 d1)                                 //重载构造函数
     {
      System.out.println("CopyConstructor run");
     }
     void  setYear(int Year)
     {
         year=Year;
     }
     int  getYear()
     {
         return year;
     }
     void  setMonth(int Month)
     {
         month=Month;
         if(Month>12) month=12;            //若month不在正确区间，大的设为12 小的设为1
         if(Month<=1) month=1;
     }
     int  getMonth()
     {
         return month;
     }
     void  setDay(int Day)
     {
         int x=0;
         day=Day;
         if(isLeapYear()==1 && month == 2) x=1;         //判断平闰年
         if(Day>(monthDay[month-1]+x)) day=monthDay[month-1]+x;   //润年二月，日期范围加1
         if(Day<=1) day=1;
     }
     int  getday()
     {
         return day;
     }
     void  tomorrow( )
     {
         int y=0;
         if(isLeapYear() == 1 && month == 2) y=1;
         if(day==(monthDay[month-1]+y))
         {
          day=1;
             if(month==12)
             {
                 month=1;       //如果是最后一个月，年份加1 月份为1
                 year++;
             }
             else month++;
         }
         else day++;
     }
     void  yesterday( )
     {
         if(day==1)
         {
             int z=0;
             if(month==1)
             {
                 year--;
                 month=12;              //如果是第一天的话，年份减1 月份为12
             }
             else month--;

             if(isLeapYear()==1 && month==2) z=1;
             day=monthDay[month-1]+z;
         }
         else day--;
     }
     void  printMonthCalendar( )
     {
         int j=0,m=0,n;
         if(isLeapYear()==1 && month==2) m=1;
         n=monthDay[month-1]+m;
         for(int i=0;i<7;i++)
         {
          System.out.print(weekName[i]+" ");         //右对齐输出,三字符长度输出
         }
         System.out.println();

         int ww=weekDay();
         for(int i=0;i<ww;i++)
         {
             System.out.printf("%4s"," ");                         //用空格填补空白
             j++;
         }
         for(int i=1;i<=n;i++)
         {
             System.out.printf("%4s",i+" ");
             j++;
             if(j%7==0) System.out.println();               //每输出七次换行
         }
         System.out.println();
     }
     void  chineseFormat( )
     {
      System.out.println(year+"年"+month+"月"+day+"日");
     }
     void  americaformat( )
     {
      System.out.print(monthName[month-1]+" ");
         System.out.print(day);
         System.out.println(","+year);
     }
     int  isLeapYear( )
     {
         if( (year%4)==0 && year%100 != 0|| (year%400)==0 ) return 1;    //判断平闰年
         else return 0;
     }
     int  weekDay( )
     {
         int w,y,d=0;
         if(year>2020)
         {
             y=year-2020;            //以2020年1月1日为基准判断每月第一天为周几
             d+=365*y+y/4+1;
             for(int i=1;i<month;i++)
             {
                 if(isLeapYear() == 1 && i==2) d++;
                 d+=monthDay[i-1];
             }
             d+=day;
             w=d%7+3;
         }
         else if(year<2020)
         {
             y=2020-year-1;
             d+=365*y+y/4;
             for(int i=12;i>=month;i--)
             {
                 if(isLeapYear()==1 && i==2) d++;
                 d+=monthDay[i-1];
             }
             d-=day-1;
             w=10-d%7;
         }
         else
         {
             for(int i=1;i<month;i++)
             {
                 if(isLeapYear()==1 && i==2) d++;
                 d+=monthDay[i-1];
             }
             w=d%7+3;
         }
         w%=7;
         return w;
     }

}

  运行截图： 

 

2 学会设置字符宽度  System.out.printf("%3s",s+" ");

3 明天继续写题