private void nameLengthStatistics() {
       Iterator i = Person.iterator();
       Person p;
       int l = Person.getMaxNameLength();
       int lengthTable[] = new int[l+1];
       int j;
       
       System.out.println();
       System.out.println("Name length: Number of persons");
       while (i.hasNext()) {
           p = (Person) i.next();
           lengthTable[p.getName().length()]++;
       }
       for (j=1; j <= l; j++) {
           System.out.print(j + ": " + lengthTable[j]+ "  ");
           if (j%5 == 0)
               System.out.println();
       }
       System.out.println();
   }