// BankAccount.java
// Defines BankAccount objects that have individual IDs, balances, and passwords
// CS 101 HW 7 problem 2

public class BankAccount {
  
  // instance variables
  private int id;
  private double balance;
  
   // constructors 
  public BankAccount(int id, double balance) {
    // we use this.id to denote the instance variable named id rather than the parameter named id.
    // when no local variable has the same name as an instance variable, using "this" is optional
    this.id = id;  
    this.balance = balance; 
  }

  public BankAccount(int id) {
    // we call the other constructor with 0 as the initial balance
    this(id, 0);
  } 
  
  // instance methods
  //
  public void deposit(double amount) {
    if (amount > 0) {
      balance += amount;
      System.out.println("Deposited $" + amount + ".");      
    } else {
      System.err.println("You must deposit a positive amount of money.");
    }
  }
  
  public void withdraw(double amount) {
    if (amount > 0 && amount <= balance) {
      balance -= amount;
      System.out.println("Withdrew $" + amount + ".");
    } else {
      System.err.println("Sorry, you must withdraw a positive amount of money up to $" + balance + ".");
    }
  }
  
  public void printBalance() {
    System.out.println("Your balance is $" + balance + ".");
  }

  public String toString() {
    return ("Account #" + id);
  }
}