class CreditCard {

  private String expirationDate;
  private String holderName;
  private String network;
  private String accountNumber;
  private double balance;


  public CreditCard (String expirationDate, String holderName, String network,
                     String accountNumber) {
    this.expirationDate  = expirationDate;
    this.holderName = holderName;
    this.network = network;
    this.accountNumber = accountNumber;
    this.balance = 0.0;
  }


  public CreditCard (String expirationDate, String holderName, String network,
                     String accountNumber, double balance) {
    this.expirationDate  = expirationDate;
    this.holderName = holderName;
    this.network = network;
    this.accountNumber = accountNumber;
    this.balance = balance;
  }


  public void changeExpiration(String expirationDate) {
    this.expirationDate = expirationDate;
  }


  public void makePayment(double paymentAmount) {
    balance -= paymentAmount; 
  }


  public void makeCharge(double chargeAmount) {
    balance += chargeAmount; 
  }

  public double getBalance() {
    return balance;
  }


  public String toString() {
    String retString = "";

    retString += holderName + ", ";
    retString += network + ", ";
    retString += accountNumber + ", ";
    retString += expirationDate +", ";
    retString += "$" + balance;

    return retString;
  }


  public boolean equals (Object o) {
    CreditCard c = (CreditCard) o;

    if (!this.expirationDate.equals(c.expirationDate))
      return false;

    if (!this.holderName.equals(c.holderName))
      return false;

    if (!this.network.equals(c.network))
      return false;

    if (!this.accountNumber.equals(c.accountNumber))
      return false;

    if (this.balance != c.balance)
      return false;

    return true;
  }

}