Sito Eratostenesa w javie

import java.util.Scanner;

public class Sito {
  public static void main(String[] args) {
    int n,i,j;
    Scanner klaw=new Scanner(System.in);
    System.out.print("n = ");
    n=klaw.nextInt();
    if(n<2) System.out.println("Brak liczb pierwszych w podanym zakresie");
    else{
      boolean skr[] = new boolean[n+1];
      for(i=2;i<=n;i++) skr[i]=false;
      i=1;
      do{
        i++;
        if(!skr[i]){
          j=i*i;
          while(j<=n){
            skr[j]=true;
            j+=i;
          }
        }
      } while(i*i<=n);
      for(i=2;i<=n;i++) if(!skr[i]) System.out.printf("%10d",i);
    }
  }
}