/** SimpleBankAccount.java - illustrate instance and local cariables
 **/

public class SimpleBankAccount {

  // Instance variables

  private String id;                    // these are all "instance" variables
  private String name;                  // of associated person
  private String address;               // to send statements to
  private long   balance;

  public SimpleBankAccount(String id, String name, String address) {
    // "this" refers to "this object" or "this instance of the class"
    this.id = id; 
    this.name = name;
    this.address = address;
    balance = 0;                        // same as this.balance = 0;
  }

  public String getName() {
    return name;
  }

  public void addToBalance (long amount) {
    balance = balance + amount;
  }

  public void calculateInterest () {
    double interest;                      // local variable
    interest = balance * interestRate;
    balance = balance + (long) interest; // "casting"
  }

  public float getBalance() {
    return balance;
  }

  private static double interestRate = .06; // class variable

  static void setInterestRate(double newRate) {
    interestRate = newRate;
  }
}