[JAVA] - 樂透程式練習 @ Work smarter not harder

最近有在練習一些小題目
把這個寫得比較完整的寫出來
做一個紀錄
有錯誤的話再有勞指導一下了！！！！

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import java.io.*;
import java.util.ListIterator;
import java.util.Random;
public class loto {
static int loto[] = new int[6];
static BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));

   public static void main(String[] args)throws IOException {


       System.out.print("自選=1,電腦選=2   您的選擇是 = "); //選擇要亂數產生還是自行輸入
       String cho = buf.readLine();
       int chon = Integer.parseInt(cho);

       switch(chon)
       {
           case 1:
           selfloto();
           break;

           case 2:
           rndloto();
           break;

           default:
           System.out.print("NO NO");

       }

}

//自行輸入樂透數字
       public static void selfloto()throws IOException{
           for(int i = 0 ; i < loto.length ; i++)
       {
           System.out.print("請輸入"+(i+1)+"的號碼");
           String chonn = buf.readLine();
           loto[i] = Integer.parseInt(chonn);
           if(loto[i]>=1&&loto[i]<=49) //判斷輸入數字是否在1~49內
           {
               for(int j = 0 ; j<i;j++) //判斷輸入數字是否有與前面重複
               {
                   if(loto[j] == loto[i])
                   {
                       System.out.print("數字重複，重新輸入");
                       i--;
                       break;
                   }
               }
           }
           else
           {
               System.out.print("數字錯誤，重新輸入");
               i--;
           }
       }

//排序
           for(int i = 0 ; i<loto.length; i++)
           {
           for(int j = i+1;j<loto.length;j++)
               {
                   if(loto[i] > loto[j])
                   { int tmp = loto[j];
                       loto[j] = loto[i];
                       loto[i] = tmp ;
                   }
               }
           }


       for(int i = 0 ; i < loto.length;i++)
           {
               System.out.print(loto[i]+" ");
           }

       }

//隨機產生樂透數字
       public static void rndloto()throws IOException
       {
           System.out.print("需要購買幾組 =");
           String count = buf.readLine();
           int countt = Integer.parseInt(count);

           for(int num = 0 ; num < countt ; num++)
           {

               for(int i = 0 ; i<loto.length; i++)
               {
               loto[i] = (int) (Math.random()*49+1); //亂數產生1~49

                   for(int j = 0 ; j< i;j++) //
                   {
                   if(loto[i] == loto[j])
                       {
                           i--;
                           break;
                       }
                   }
               }

//排序
           for(int i = 0 ; i<loto.length; i++)
           {
           for(int j = i+1;j<loto.length;j++)
               {
                   if(loto[i] > loto[j])
                   { int tmp = loto[j];
                       loto[j] = loto[i];
                       loto[i] = tmp ;
                   }
               }
           }

           System.out.print("第"+(num+1)+"組數字 = ");
           for(int i = 0 ; i < loto.length;i++)
           {
               System.out.print(loto[i]+" ");
           }
               System.out.println();

           }

       }
   }