Java program to print amstrong numbers upto given number

import java.io.*;

class strangenum

{int num,temp,d,s;

  strangenum(int a)

  { num=a;}

  void gen_strange()

  { System.out.println("strnge numbers are");

       for(int i=0;i<=num;i++)

        {temp=i;

          s=0;

          while(temp>0)

          { d=temp%10;

             s+=d*d*d;

             temp/=10; }

      if(s==i)

        System.out.println(i); }

  }

  public static void main(String s[])throws IOException

  { BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

     System.out.println("Enter the limit");

     int a=Integer.parseInt(br.readLine());

     strangenum st=new strangenum(a);

     st.gen_strange();}

}