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Main.java

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+public class Main {
+    public static void main(String[] args) {
+
+        // invoking / creating a new bankAccount with params.
+        bankAccount tonyBank = new bankAccount("tony o", "BA0069");
+
+        // the first thing our program should do is run showMenu() function.
+        tonyBank.showMenu();
+
+
+    }
+}
+

bankAccount.java

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+import java.util.Scanner;
+
+public class bankAccount {
+    /* The class has 4 instance variables:
+    1. balance to store the current balance of the account
+    2. previousTransaction to store the amount of the last transaction
+        (either deposit or withdraw)
+    3. customerName to store the name of the customer
+    4. customerID to store the ID of the customer */
+    int balance;
+    int previousTransaction;
+    String customerName;
+    String customerID;
+
+    bankAccount(String cname, String cID) {
+        customerName = cname;
+        customerID = cID;
+    }
+
+
+    void deposit(int amount) {
+        if (amount != 0) {
+            balance = balance + amount;
+            previousTransaction = amount;
+        }
+    }
+
+    void withdraw (int amount) {
+        if (balance != 0) {
+            balance = balance - amount;
+            previousTransaction = -amount;
+        }
+    }
+
+    void getPreviousTransaction() {
+        if (previousTransaction > 0) {
+            System.out.println("DEPOSITED: " + previousTransaction);
+        } else if (previousTransaction < 0) {
+            System.out.println("WITHDRAW: " + Math.abs(previousTransaction));
+        } else {
+            System.out.println("No Transaction Occurred");
+        }
+    }
+
+
+    void showMenu() {
+
+        char option;
+        Scanner scan = new Scanner(System.in);
+        System.out.println("Welcome " +customerName);
+        System.out.println("Your ID " + customerID);
+        System.out.println("\n");
+
+        System.out.println("A : Check your balance");
+        System.out.println("B : Deposit");
+        System.out.println("C : Withdraw");
+        System.out.println("D : Previous Transaction");
+        System.out.println("E : EXIT");
+
+        do {
+            System.out.println("=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*");
+            System.out.println("Enter Your Option");
+            System.out.println("=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*");
+            option = scan.next().toUpperCase().charAt(0); // what doe this mean? - charAt(0) ? - how is it different from "next().char"
+            System.out.println("\n");
+
+            switch (option) {
+                case 'A' -> {
+                    System.out.println("--------------------------------------------------------------------------");
+                    System.out.println("Balance = " + balance);
+                    System.out.println("--------------------------------------------------------------------------");
+                }
+                case 'B' -> {
+                    System.out.println("--------------------------------------------------------------------------");
+                    System.out.println("Enter an amount to deposit ");
+                    System.out.println("--------------------------------------------------------------------------");
+                    int amount = scan.nextInt(); // will program still work if this & next line are moved above case A?
+                    deposit(amount); /* ANSWER: NO! - because we need the deposit() to run EXACTLY here at case B - aka
+                                    'deposit functionality' */
+                    System.out.println("\n");
+                }
+                case 'C' -> {
+                    System.out.println("--------------------------------------------------------------------------");
+                    System.out.println("Enter an amount to withdraw ");
+                    System.out.println("--------------------------------------------------------------------------");
+                    int amount2 = scan.nextInt();
+                    withdraw(amount2); // Just like case B, we plug in withdraw() func here.
+                    System.out.println("\n"); // see how the program looks w/out this line break.
+                }
+                case 'D' -> {
+                    System.out.println("--------------------------------------------------------------------------");
+                    getPreviousTransaction();
+                    System.out.println("--------------------------------------------------------------------------");
+                    System.out.println("\n");
+                }
+                case 'E' ->
+                        System.out.println("============================================================================");
+                default -> System.out.println("Invalid! - Please choose again");
+            }
+        } while (option !='E');
+        System.out.println("Thank You!");
+
+    }
+
+
+}