Number predictor game in java

Here is the program for predicting the number which was selected by the user
Lets try this on your PC........
First of all user has to select one number between 1 and 15.Then program will start prediction.
Finally program will predict and print the selected number

import java.io.*;
class Game
  {
   public static void main(String args[]) throws IOException
    {
     int[] a1={8,9,10,11,12,13,14,15};
     int[] a2={4,5,6,7,12,13,14,15};
     int[] a3={2,3,6,7,10,11,14,15};
     int[] a4={1,3,5,7,9,11,13,15};
      DataInputStream din=new DataInputStream(System.in);
      String str=new String();
      System.out.println("choose one number from 1 to 15");
         System.out.println("is your choosen number present in below list enter 1 else enter 0:");
          for(int j=0;j<8;j++)
           {System.out.print("  "+a1[j]);
           }
            System.out.println(" ");
          str=str+din.readLine();    
      System.out.println("is your choosen number present in below list enter 1 else enter 0:");
          for(int j=0;j<8;j++)
           {System.out.print("  "+a2[j]);
           } System.out.println(" ");
           str=str+din.readLine();    
      System.out.println("is your choosen number present in below list enter 1 else enter 0:");
          for(int j=0;j<8;j++)
           {System.out.print("  "+a3[j]);
           } System.out.println(" ");
              str=str+din.readLine();    
      System.out.println("is your choosen number present in below list enter 1 else enter 0:");
          for(int j=0;j<8;j++)
           {System.out.print("  "+a4[j]);
           } System.out.println(" ");
             str=str+din.readLine();    
       number(str);
    }
  static void number(String str)
     {
      int num=Integer.parseInt(str);
         int temp=num;
          int i=0;
        while(temp>0)
           {
             i++;
             temp=temp/10;
            }int k=0;   int dec=0;
        while(num>0)
            {
             int rem=num%10;
             dec=dec+rem*pow(2,k);
             k++;
             num=num/10;
            }
        System.out.println("your selected number is"+dec);
      }
   static int pow(int a,int b)
      {
        if(b==0)
          {return(1);}
        else{return(a*pow(a,b-1));}
      }
  }

  OUTPUT of the above game is

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