java程式設計題目---日期處理【印製月曆(一月)】

請設計一個程式可以印製某一年一月的月曆，請使用者輸入年份及當年第一天(1月1日)是星期幾，其中0代表星期日，1至6分別代表星期一至星期六。範例如下:

import java.util.Scanner;

public class C1
{

  public static void main(String[] args) 
 {
  Scanner input = new Scanner(System.in);
  
  //提示使用者輸入年份和當年第一天資訊
  System.out.println("使用者輸入:");
  String year = input.next();
  int a = input.nextInt();
  int i;
  int count = a + 1;
  
  //印出月曆抬頭
  System.out.println(year+"年1月份");
  
  System.out.println("Sun" + "  " + "Mon" + "  " + "Tue" + "  " + "Wed" +
  "  " + "Thu" + "  " + "Fri" + "  " +"Sat");
  

   //設定該年一月月曆是從星期幾開始
  if( a == 1 )
  {
      System.out.print("   ");
  }
  if( a == 2) 
  {
      System.out.print("   " + "     " );
  }
  if( a == 3) 
  {
      System.out.print("   " + "     " + "     " );
  }
  if( a == 4) 
  {
      System.out.print("   " + "     " + "     " + "     ");
  }
  if( a == 5) 
  {
      System.out.print("   " + "     " + "     " + "     " + "     ");
  }
  if( a == 6) 
  {
      System.out.print("   " + "     " + "     " + "     " + "     " + "     ");
  }
  
  
  //輸出結果
  for( i=1 ; i <= 31 ; i++ )
  {
   
   if(count % 7 == 1 )
   {
    System.out.printf("\n%3d",i); //在這裡會換行
   }
   else if(count % 7 == 0)
   {
    System.out.printf("%5d",i);
   }
   else if(count % 7 == 2)
   {
    System.out.printf("%5d",i);
   }
   else if(count % 7 == 3)
   {
    System.out.printf("%5d",i);
   }
   else if(count % 7 == 4)
   {
    System.out.printf("%5d",i);
   }
   else if(count % 7 == 5)
   {
    System.out.printf("%5d",i);
   }
   else if(count % 7 == 6)
   {
    System.out.printf("%5d",i);
   }
   
   count = count + 1 ;
   
  }
  
 }

}