package coreservlets;/** Bean to represent a bank customer. Immutable. *  <p> *  From <a href="http://courses.coreservlets.com/Course-Materials/">the *  coreservlets.com tutorials on servlets, JSP, Struts, JSF, Ajax, GWT,  *  Spring, Hibernate/JPA, and Java programming</a>. */public class BankCustomer {  private String id, firstName, lastName;  private double balance;  public BankCustomer(String id,                      String firstName,                      String lastName,                      double balance) {    this.id = id;    this.firstName = firstName;    this.lastName = lastName;    this.balance = balance;  }    public String getId() {    return id;  }  public String getFirstName() {    return(firstName);  }  public String getLastName() {    return(lastName);  }  public double getBalance() {    return(balance);  }  public double getBalanceNoSign() {    return(Math.abs(balance));  }}