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Author: M-F-Tushar

OOP in Java/Chapter 10 - Object-Oriented Thinking/Code_Example/Exercise10_07.java

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+package ch_10;
+
+import java.util.Scanner;
+
+import ch_09.exercise09_07.Account;
+
+/**
+ * 10.7 (Game: ATM machine) Use the Account class created in
+ * Programming Exercise 9.7 to simulate an ATM machine.
+ * Create ten accounts in an array with id 0, 1, . . . , 9,
+ * and initial balance $100. The system prompts the user to
+ * enter an id. If the id is entered incorrectly, ask the user
+ * to enter a correct id. Once an id is accepted, the main menu
+ * is displayed as shown in the sample run. You can enter a choice
+ * 1 for viewing the current balance, 2 for withdrawing money, 3 for
+ * depositing money, and 4 for exiting the main menu. Once you exit,
+ * the system will prompt for an id again. Thus, once the system
+ * starts, it will not stop.
+ *
+ * @author Harry D.
+ */
+public class Exercise10_07 {
+    public static void main(String[] args) {
+
+        Scanner input = new Scanner(System.in);
+
+        Account[] atmAccounts = new Account[10];
+
+        for (int i = 0; i < atmAccounts.length; i++) {
+
+            atmAccounts[i] = new Account(i, 100.00);
+
+        }
+        LOOP:
+        for (; ; ) { // Enter 1234 to end the program
+
+            System.out.print("Please enter an account ID#: ");
+
+
+            int idOfAcc = input.nextInt();
+            if (idOfAcc == 1234) {
+                break;
+            }
+
+            while (idOfAcc < 0 | idOfAcc > 9) {
+
+                System.out.println("Incorrect ID# please enter a correct ID# ");
+
+                idOfAcc = input.nextInt();
+                if (idOfAcc == 1234) {
+                    break LOOP;
+                }
+            }
+
+
+            int userInput = 0;
+
+            while (userInput != 4) {
+
+
+                System.out.println("Main Menu");
+                System.out.println("1: Check Balance");
+                System.out.println("2: Withdraw");
+                System.out.println("3: Deposit");
+                System.out.println("4: Exit");
+                System.out.print("Enter a choice now:");
+
+                userInput = input.nextInt();
+                executeCommand(userInput, idOfAcc, input, atmAccounts);
+
+            }
+        }
+    }
+
+    public static void executeCommand(int userCommand, int accId,
+                                      Scanner j, Account[] arr) {
+
+        switch (userCommand) {
+
+            case 1:
+                System.out.printf("The balance in account " + accId + " is $%.2f \n",
+                        arr[accId].getBalance());
+                break;
+
+            case 2:
+                System.out.print("Enter the amount you want to withdraw:");
+                arr[accId].withdraw(j.nextDouble());
+                break;
+
+            case 3:
+                System.out.print("Enter the amount you you want to deposit:");
+                arr[accId].deposit(j.nextDouble());
+
+
+        }
+
+    }
+
+}