1.3.16使用1.3.1.5节中的readInts()作为模板为Date编写一个静态方法readDates(),从标准输入中读取由练习1.2.19的表格所指定的格式的多个日期并返回一个它们的数组。

答：public static SmartDate[] readDates(String name)

public class SmartDate

{

   private final int myYear;

   private final int myMonth;

   private final int myDay;

  

   public SmartDate(String date)

   {

       String[] words=date.split("/");

       int month=Integer.parseInt(words[0]);

       int day=Integer.parseInt(words[1]);

       int year=Integer.parseInt(words[2]);

       //

      mySmartDate(month,day,year);

      //

       myYear=year;

       myMonth=month;

       myDay=day;

   }

  

    public SmartDate(int month,int day,int year)

    {

        mySmartDate(month,day,year);

        //

        myYear=year;

        myMonth=month;

        myDay=day;

        //

      }

   

    private void mySmartDate(int month,int day,int year)

    {

        if(year<0)       throw new IllegalArgumentException("year is error.");

        if(month<1 || month>12)    throw new IllegalArgumentException("month is error.");

        if(day<1 || day>31)    throw new IllegalArgumentException("day is error.");

        if(month%2==0 && day>30)  throw new IllegalArgumentException("day is error.");

        if(year%400!=0 && (!(year%4==0 && year%100!=0)) && month==2 && day>28) throw new IllegalArgumentException("day is error.");

        if((year%400==0 || (year%4==0 && year%100!=0)) && month==2 && day>29) throw new IllegalArgumentException("day is error.");

    }

   

    public int month()

    {

        return myMonth;

    }

   

    public int day()

    {

        return myDay;

    }

   

    public int year()

    {

        return myYear;

    }

   

    public String dayOfTheWeek()

    {

        int w=(myYear%100+(myYear%100)/4+(myYear-myYear%100)/4-2*(myYear-myYear%100)+26*(myMonth+1)/10+myDay-1)%7;

        if(w<0) w=w+7;

        String weekstr="";

        switch(w)

        {

            case 0: weekstr="Sunday"; break;

            case 1: weekstr="Monday"; break;

            case 2: weekstr="Tuesday"; break;

            case 3: weekstr="Wednesday"; break;

            case 4: weekstr="Thursday"; break;

            case 5: weekstr="Friday"; break;

            case 6: weekstr="Saturday"; break;

        }

      return weekstr;

    }

   

    public String toString()

    {

        return month()+"/"+day()+"/"+year();

    }

   

    public static SmartDate[] readDates(String name)

    {

        In in=new In(name);

        Queue<String> q=new Queue<String>();

        while(!in.isEmpty())

            q.enqueue(in.readString());

        int N=q.size();

        SmartDate[] a=new SmartDate[N];

        for(int i=0;i<N;i++)

            a[i]=new SmartDate (q.dequeue());

        return a;

    }

   

    public static void main(String[] args)

    {

        SmartDate[] b=SmartDate.readDates(args[0]);

        for(int i=0;i<b.length;i++)

            StdOut.printf("%s\n",b[i].toString());

    }

}