Bank.scala

package com.abc

import scala.collection.mutable.ListBuffer

class Bank {
  private val customers = new ListBuffer.empty[Customer]

  def addCustomer(name: String): Customer = {
    val a = Customer(name)
    customers += a
    a
  }

  def customerSummary: String = {
    var summary: String = "Customer Summary"
    for (customer <- customers)
      summary = summary + "\n - " + customer.name + " (" + format(customer.numberOfAccounts, "account") + ")"
    summary
  }

  private def format(number: Int, word: String): String = {
    number + " " + (if (number == 1) word else word + "s")
  }

  def totalInterestPaid: Double = {
    var total: Double = 0
    for (c <- customers) total += c.totalInterestEarned
    return total
  }

  def getFirstCustomer: String = {
    try {
      customers = null
      customers(0).name
    }
    catch {
      case e: Exception => {
        e.printStackTrace
        return "Error"
      }
    }
  }

}