3.11 (Modified Account Class) Modify class Account (Fig. 3.8) to provide a method called wi th-draw that withdraws money from an Account. Ensure that the withdrawal amount does not exceedthe Account's balance. If it does, the balance should be left unchanged and the method should printa message indicating "Withdrawal amount exceeded account balance." Modify class AccountTest(Fig. 3.9) to test method withdraw. I // Fig. 3.8: Account.java// Account class with a double instance variable balance and a constructor// and deposit method that perform validation.2.45 public class Account {private String name; // instance variableprivate double balance; // instance variable678// Account constructor that receives two parameterspublic Account(String name, double balance) {this.name = name; // assign name to instance vari able name91012// validate that the balance is greater than 0.0; if it's not,// instance variable balance keeps its default initial value of 0.0if (balance > 0.0) { // if the balance is validthis.balance = balance; // assign it to instance variable balance13141516171819// method that deposits (adds) only a valid amount to the balancepublic void deposit(double depositAmount) {if (depositAmount > 0.0) { // if the depositAmount is validbalance = balance + depositAmount; // add it to the balance202122232425// Fig. 3.9: AccountTest.java// Inputting and outputting floating-point numbers with Account objects.3 import java.util.Scanner;4public class AccountTest {public static void main(String[] args) {Account accountl = new Account("Jane Green", 50.00);Account account2 = new Account("John Blue", -7.53);// display initial balance of each objectSystem.out.printf("%s balance: $%.2f%n",accountl.getName (), accountl.getBalance():System.out.printf("%s balance: $%.2f%n%n",account2.getName(), account2.getBalance());10%3D12131415// create a Scanner to obtain input from the command windowScanner input = new Scanner(System.in);16171819System.out.print("Enter deposit amount for accountl: "); // promptdouble depositAmount = input.nextDouble(); // obtain user inputSystem.out.printf("%nadding %.2f to accountl balance%n%n",depositAmount);accountl.deposit(depositAmount); // add to accountl's balance2021222324// display balancesSystem.out.printf("%s balance: $%.2f%n",accountl.getName(), accountl.getBalance(0);System.out.printf("%s balance: $%.2f%n%n",account2.getName (), account2.getBalance());25262728293031System.out.print("Enter deposit amount for account2: "); // promptdepositAmount = input.nextDouble(); // obtain user inputSystem.out.printf("%nadding %.2f to account2 balance%n%n",depositAmount);account2.deposit(depositAmount); // add to account2 balance3233343536// display balancesSystem.out.printf("%s balance: $%.2f%n",account1.getName (), accountl.getBalance();System.out.printf("%s balance: $%.2f%n%n",account2.getName(), account2.getBalance());373839404142 }43 }

public class Account { private String name; // instance variable private double balance; //…

3.11 (Modified Account Class) Modify class Account (Fig. 3.8) to provide a method called with- draw that withdraws money from an Account. Ensure that the withdrawal amount does not exceed the Account's balance. If it does, the balance should be left unchanged and the method should print a message indicating "withdrawal amount exceeded account balance." Modify class AccountTest (Fig. 3.9) to test method wi thdraw.

3.11 (Modified Account Class) Modify class Account (Fig. 3.8) to provide a method called with- draw that withdraws money from an Account. Ensure that the withdrawal amount does not exceed the Account's balance. If it does, the balance should be left unchanged and the method should print a message indicating "withdrawal amount exceeded account balance." Modify class AccountTest (Fig. 3.9) to test method wi thdraw.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is:

Question

3.11 (Modified Account Class) Modify class Account (Fig. 3.8) to provide a method called wi th-
draw that withdraws money from an Account. Ensure that the withdrawal amount does not exceed
the Account's balance. If it does, the balance should be left unchanged and the method should print
a message indicating "Withdrawal amount exceeded account balance." Modify class AccountTest
(Fig. 3.9) to test method withdraw.

I // Fig. 3.8: Account.java
// Account class with a double instance variable balance and a constructor
// and deposit method that perform validation.
2.
4
5 public class Account {
private String name; // instance variable
private double balance; // instance variable
6
7
8
// Account constructor that receives two parameters
public Account(String name, double balance) {
this.name = name; // assign name to instance vari able name
9
10
12
// validate that the balance is greater than 0.0; if it's not,
// instance variable balance keeps its default initial value of 0.0
if (balance > 0.0) { // if the balance is valid
this.balance = balance; // assign it to instance variable balance
13
14
15
16
17
18
19
// method that deposits (adds) only a valid amount to the balance
public void deposit(double depositAmount) {
if (depositAmount > 0.0) { // if the depositAmount is valid
balance = balance + depositAmount; // add it to the balance
20
21
22
23
24
25
// Fig. 3.9: AccountTest.java
// Inputting and outputting floating-point numbers with Account objects.
3 import java.util.Scanner;
4
public class AccountTest {
public static void main(String[] args) {
Account accountl = new Account("Jane Green", 50.00);
Account account2 = new Account("John Blue", -7.53);
// display initial balance of each object
System.out.printf("%s balance: $%.2f%n",
accountl.getName (), accountl.getBalance():
System.out.printf("%s balance: $%.2f%n%n",
account2.getName(), account2.getBalance());
10
%3D
12
13
14
15
// create a Scanner to obtain input from the command window
Scanner input = new Scanner(System.in);
16
17
18
19
System.out.print("Enter deposit amount for accountl: "); // prompt
double depositAmount = input.nextDouble(); // obtain user input
System.out.printf("%nadding %.2f to accountl balance%n%n",
depositAmount);
accountl.deposit(depositAmount); // add to accountl's balance
20
21
22
23
24
// display balances
System.out.printf("%s balance: $%.2f%n",
accountl.getName(), accountl.getBalance(0);
System.out.printf("%s balance: $%.2f%n%n",
account2.getName (), account2.getBalance());
25
26
27
28
29
30
31
System.out.print("Enter deposit amount for account2: "); // prompt
depositAmount = input.nextDouble(); // obtain user input
System.out.printf("%nadding %.2f to account2 balance%n%n",
depositAmount);
account2.deposit(depositAmount); // add to account2 balance
32
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36
// display balances
System.out.printf("%s balance: $%.2f%n",
account1.getName (), accountl.getBalance();
System.out.printf("%s balance: $%.2f%n%n",
account2.getName(), account2.getBalance());
37
38
39
40
41
42 }
43 }

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