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此文档包含平时从各种渠道积累的杂七杂八题目

一、题目总览

编号	题目
1	打印一个月的日历

二、题目及解答

1.打印一个月的日历

代码

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

public class Test
{
   public static void main(String[] args)
   {
      // construct d as current date
      Locale.setDefault(Locale.ENGLISH);

      GregorianCalendar d = new GregorianCalendar();

      int month = d.get(Calendar.MONTH); //用于循环打印当前月份的月历__月份判断
      int today = d.get(Calendar.DAY_OF_MONTH); //用于给当前日期后面加"*"

      String weekdays[] = new DateFormatSymbols().getShortWeekdays(); //保存7个星期名

      for(int i=1; i<8; ++i)
          System.out.print(weekdays[i]+" ");    //打印月历头部，7个星期名
      System.out.println();

      d.set(Calendar.DAY_OF_MONTH, 1); //设置d的日期为当月1号
      int weeknameofFirstday = d.get(Calendar.DAY_OF_WEEK);//获得当月1号的星期名

      int cnt = 1;
      while(weekdays[cnt] != weekdays[weeknameofFirstday])  //打印日历第一行，判断当月1号从第一行的哪里开始打印
      {
          System.out.print("    ");
          ++cnt;
      }

      do
      {
          int day = d.get(Calendar.DAY_OF_MONTH);
          System.out.printf("%3s", day);
          if(day == today)
              System.out.print("*");
          else
              System.out.print(" ");

          if(weekdays[d.get(Calendar.DAY_OF_WEEK)] == weekdays[7]) //判断是否需要换行打印
              System.out.println();
          d.add(Calendar.DAY_OF_MONTH, 1);
      }while(d.get(Calendar.MONTH) == month);
   }
}

打印效果

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