BankAccount.java

import java.util.Random;
import java.util.ArrayList;
import java.util.List;

// ### Inheritance ###
public abstract class BankAccount {
    private String user;
    private String password;
    private int accountNumber;
    private double balance;
    private List<Transaction> transactionHistory;

    public BankAccount(String user, String password) {
        this.user = user;
        this.password = password;
        Random rand = new Random();
        this.accountNumber = 100000000 + rand.nextInt(900000000);
        this.balance = 0.00;

        // add this new account instance to our database
        AccountInfo.accountDatabase.add(this);

        this.transactionHistory = new ArrayList<>(); // initialize list of transaction history
    }

    // Helper method to add a completed transaction to the log
    public void addTransaction(Transaction tx) {
        this.transactionHistory.add(tx);
    }

    // helper for updating balance after deposit
    public void credit(double amount) {
        if (amount > 0) {
            this.balance += amount;
        }
    }

    // helper for decrementing balance by withdrawal amt
    public void debit(double amount) {
        if (amount > 0 && this.balance >= amount) {
            this.balance -= amount;
        }
    }

    // helper for changing password
    public void changePassword(String newPassword) {
        if (newPassword != null && !newPassword.trim().isEmpty()) {
            this.password = newPassword;
        }
    }

    // Getters

    // getter for transaction history
    public List<Transaction> getTransactionHistory() {
        return this.transactionHistory;
    }

    public String getUser() {
        return this.user;
    }

    public String getPass() {
        return this.password;
    }

    public int getAccountNumber() {
        return this.accountNumber;
    }

    public double getBalance() {
        return this.balance;
    }
}