Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Transcribed Image Text: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
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// Account constructor that receives two parameters
public Account(String name, double balance) {
this.name = name; // assign name to instance vari able name
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// 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
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// 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
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// 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());
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%3D
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// create a Scanner to obtain input from the command window
Scanner input = new Scanner(System.in);
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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
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// 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());
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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
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// 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());
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42 }
43 }](https://content.bartleby.com/qna-images/question/f89e551b-b1f1-4813-9e4c-059c3e255e20/81a22ed8-861a-4c7a-969c-d9f8d01e7cd0/ginvpq_processed.png)
Transcribed Image Text: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
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// 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
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14
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// 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
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21
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// 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
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// create a Scanner to obtain input from the command window
Scanner input = new Scanner(System.in);
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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
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// 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());
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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
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// 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());
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42 }
43 }
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