public static boolean insertCustomer(Customer c) {

    // Flag if record is inserted or not
    boolean isInserted = false;

    // Check if array is full, prompt and leave method if so
    if (numOfCustomers >= MAX_CUSTOMER) {
      System.out.println(c.getName() + " NOT ADDED! Maximum number of Customers present");
      return false;
    }

    // validate if customer object is already in array
    // if findCustomer returns null, not in array
    if (!((findCustomer(c)) == null)) {
      System.out.println(c.getName() + " NOT ADDED! Duplicate record found in database");
      return false;
    }

    // Insert into array
    for (int i = 0; i < numOfCustomers; i++) {

      // If next item customerArray[i] is larger, insert before current item
      // alternatively if at the end of the array already, insert at the end
      if (c.compareTo(customerArray[i]) < 0) {

        Customer swappedOutCustomer = customerArray[i];
        customerArray[i] = c;
        isInserted = true;

        // Push all the rest 1 value back
        for (int j = i; j < numOfCustomers; j++) {
          Customer toInsert = swappedOutCustomer;
          swappedOutCustomer = customerArray[j + 1];
          customerArray[j + 1] = toInsert;
        }

        // Inserted, so break out of loop
        break;
      }
    }

    // If not inserted by now, means c belongs at the end
    if (!isInserted) {
      customerArray[numOfCustomers] = c;
    }

    // Increment number of customers
    numOfCustomers++;

    return true;
  }
  public void customerSorting() {
    for (int p = 0; p < this.customer.size(); p++) {
      Customer customer1 = this.customer.get(p);

      for (int i = 0; i < this.customer.size(); i++) {

        Customer customer2 = this.customer.get(i);
        int compare = customer1.compareTo(customer2);
        if (compare % 10 < 2) {
          int customer1Index = this.customer.indexOf(customer1);
          this.customer.remove(i);
          this.customer.add(i, customer1);
          this.customer.remove(customer1Index);
          this.customer.add(customer1Index, customer2);
          customer1 = customer2;
        }
      }
    }
  }