时空旅客

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http://hfc.blogbus.com/logs/18448596.html

日历来的，花了我2个小时

import javax.swing.JOptionPane;

public class Calender {
       
  
    public static void main(String[] args) {
        //分别输入年份和1月1日是星期几
        String yearString = JOptionPane.showInputDialog("输入年份（1900-2100）：");
        int year=Integer.parseInt(yearString);
        String weekdayString = JOptionPane.showInputDialog("该年1月1日是星期几？\n"+
         "输入“1”表示星期一，“2”表示星期二，如此类推（只能输入1-7的整数）");
        int weekday=Integer.parseInt(weekdayString);
       
        //weekdayNext变量为提示下一个月的首日的星期
        int weekdayNext=1;
        //定义日历的题目
        String output_00 = "Calender of "+year;
        output_00 +="\n____________________________________\n";
       
        //用month数组储存月份及其名字
        String[] Months = new String[13] ;
        for (int i_m=1;i_m<=12;i_m++)
         Months[i_m]=i_m+"月";
        //用output数组储存各月份的日历
        String[] output = new String[13] ;
       
        //检查闰年
        int runyear=1;
        if ((year%4==0&&year%100!=0)||year%400==0)
         runyear=29;
        else
         runyear=28;
       
        //分别制作各月份的日历
        for(int m=1;m<=12;m++){
         switch (m)
         {
          case 1://输入月的标题
           output[m]+="      "+Months[m]+"       "+"\n_______________________________________\n"+
         "MON    TUE    WED    THU    FRI    SAT    SUN\n";
              //通过weekday变量确定首日的位置
              if (weekday>1)
              {for (int i_sp=2;i_sp<=weekday;i_sp++)
              output[m]+="            ";}
              //分别输入各日子
              for (int i=1;i<=31;i++){
              if (i<9)
              {if ((weekday+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"          ";}
              else if (i==9)
              {if ((weekday+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"        ";}
              else
               {if ((weekday+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"       ";}
              }
              //计算下一个月首日的位置
              weekdayNext=((31-(8-weekday))%7)+1;
            break;
          case 2://输入月的标题
           output[m]+="\n       "+Months[m]+"       "+"\n_______________________________________\n"+
         "MON    TUE    WED    THU    FRI    SAT    SUN\n";
           //通过weekdayNext变量确定首日的位置
                if (weekdayNext>1)
                {for (int i_sp=2;i_sp<=weekdayNext;i_sp++)
                 output[m]+="            ";}
           //分别输入各日子
              for (int i=1;i<=runyear;i++){
              if (i<9)
              {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"          ";}
              else if (i==9)
              {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"        ";}
              else
               {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"       ";}
              }
              //计算下一个月首日的位置
              weekdayNext=((runyear-(8-weekdayNext))%7)+1;
            break;
            
          case 3: case 5: case 7: case 8: case 10: case 12:
           //输入月的标题
           output[m]+="\n       "+Months[m]+"       "+"\n_______________________________________\n"+
         "MON    TUE    WED    THU    FRI    SAT    SUN\n";
           //通过weekdayNext变量确定首日的位置
                if (weekdayNext>1)
                {for (int i_sp=2;i_sp<=weekdayNext;i_sp++)
                 output[m]+="            ";}
           //分别输入各日子
              for (int i=1;i<=31;i++){
              if (i<9)
              {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"          ";}
              else if (i==9)
              {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"        ";}
              else
               {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"       ";}
              }
              //计算下一个月首日的位置
              weekdayNext=((31-(8-weekdayNext))%7)+1;
           break;
         
          case 4: case 6: case 9: case 11:
           //输入月的标题
           output[m]+="\n       "+Months[m]+"       "+"\n_______________________________________\n"+
         "MON    TUE    WED    THU    FRI    SAT    SUN\n";
           //通过weekdayNext变量确定首日的位置
                if (weekdayNext>1)
                {for (int i_sp=2;i_sp<=weekdayNext;i_sp++)
                 output[m]+="            ";}
           //分别输入各日子
              for (int i=1;i<=30;i++){
              if (i<9)
              {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"          ";}
              else if (i==9)
              {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"        ";}
              else
               {if ((weekdayNext+i-1)%7==0)
                output[m]+=i+" \n";
               else
                output[m]+=i+"       ";}
              }
              //计算下一个月首日的位置
              weekdayNext=((30-(8-weekdayNext))%7)+1;
           break;
        }
        }
         //用outputFinal储存日历标题和各月日历
         String outputFinal = output_00;
         for (int i_f=1;i_f<=12;i_f++)
         outputFinal += output[i_f];
         
         //输出日历
   JOptionPane.showMessageDialog(null,outputFinal);
}
}