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import java.security.SecureRandom;
import java.security.NoSuchAlgorithmException;
// ...

public static void main (String args[])
{
   try
   {
      static SecureRandom number = SecureRandom.getInstance ("SHA-1SHA1PRNG");
      // ...
      // generate 20 integers 0..20
      for (int i=0; i<20; i++)
      {
         System.out.println(number.nextInt(21));
      }
   }
   catch (NoSuchAlgorithmException nsae) {}
}