title: Field with random int value
body: <p>I'm writing a program that simulates simple bank account activities and I was wondering how to do it so that if I create a new Account without any parameters, it receives random 7digit identification number that is shown as String. The way I do, I only receive java.util.Random@2a0364ef in output. 
  Looking forward to any help and additional comments on this question as it is the first one I've posted on this website.</p>
  
  <pre><code>    import java.util.Random;
  
      class Account {
  
      String id;
      double stan;
      int num;
      static int counter;
  
      public Account() {
          **id = randomId().toString();**
          stan = 0;
          num = ++counter;
  
      }
  
      public Account(String id) {
          this.id = id;
          stan = 0;
          num = ++counter;
  
      }
  
      public Account(String id, double mon) {
          stan = 0;
          this.id = id;
          this.stan = mon;
          num = ++counter;
  
      }
  
      **static String randomId() {
          Random rand = new Random(7);
          return String.valueOf(rand);**
      }
  
      String getId() {
          return id;
      }
  
      double getStan() {
          return stan;
      }
  
      int getNum() {
          return num;
      }
  
      @Override
      public String toString() {
          return "Account's id " + getId() + " and balance " + getStan();
      }
  }
  
  public class Exc7 {
  
      public static void main(String[] args) {
          Account account = new Account("0000001"),
                  acount0 = new Account("0000002", 1000),
                  acount1 = new Account();
  
  
  
  
          System.out.println(account + "\n" + account0 + "\n" + account1);
      }
  
  }
  </code></pre>