ing owner, long number) ing owner) - initializes th-

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
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File Account.java contains a definition for a simple bank account class with methods to withdraw, deposit, get the balance
and account number, and return a String representation. Note that the constructor for this class creates a random account
number. Save this class to your directory and study it to see how it works. Then modify it as follows:
1.
Overload the constructor as follows:
public Account (double initBal, String owner, long number) - initializes the balance, owner, and account
number as specified
• public Account (double initBal, String owner) - initializes the balance and owner as specified; randomly
generates the account number.
public Account (String owner) - initializes the owner as specified; sets the initial balance to 0 and randomly
generates the account number.
2. Overload the withdraw method with one that also takes a fee and deducts that fee from the account.
File TestAccount.java contains a simple program that exercises these methods. Save it to your directory, study it to see what
it does, and use it to test your modified Account class.
//*******
// Account.java
//
// A bank account class with methods to deposit to, withdraw from,
// change the name on, and get a String representation
// of the account.
// *****
********
*********
***
public class Account
{
private double balance;
private String name;
private long acctNum;
//-
//Constructor
initializes balance, owner, and account number
//--
public Account(double initBal, String owner, long number)
{
balance = initBal;
name =
owner;
acctNum = number;
}
/-
// Checks to see if balance is sufficient for withdrawal.
// If so, decrements balance by amount; if not, prints message.
//--
public void withdraw (double amount)
{
if (balance >= amount)
balance
else
amount;
-=
System.out.println("Insufficient funds") ;
}
//-
// Adds deposit amount to balance.
//-
Chapter 7: Object-Oriented Design
109
public void deposit (double amount)
{
balance += amount;
}
/-
// Returns balance.
//--
public double getBalance()
{
return balance;
//
// Returns a string containing the name,
//---
public String toString ()
{
account number, and balance.
return "Name:"
name
"\nAccount Number:
%3D
+ acctNum +
"\nBalance:
" + balance;
}
}
Transcribed Image Text:File Account.java contains a definition for a simple bank account class with methods to withdraw, deposit, get the balance and account number, and return a String representation. Note that the constructor for this class creates a random account number. Save this class to your directory and study it to see how it works. Then modify it as follows: 1. Overload the constructor as follows: public Account (double initBal, String owner, long number) - initializes the balance, owner, and account number as specified • public Account (double initBal, String owner) - initializes the balance and owner as specified; randomly generates the account number. public Account (String owner) - initializes the owner as specified; sets the initial balance to 0 and randomly generates the account number. 2. Overload the withdraw method with one that also takes a fee and deducts that fee from the account. File TestAccount.java contains a simple program that exercises these methods. Save it to your directory, study it to see what it does, and use it to test your modified Account class. //******* // Account.java // // A bank account class with methods to deposit to, withdraw from, // change the name on, and get a String representation // of the account. // ***** ******** ********* *** public class Account { private double balance; private String name; private long acctNum; //- //Constructor initializes balance, owner, and account number //-- public Account(double initBal, String owner, long number) { balance = initBal; name = owner; acctNum = number; } /- // Checks to see if balance is sufficient for withdrawal. // If so, decrements balance by amount; if not, prints message. //-- public void withdraw (double amount) { if (balance >= amount) balance else amount; -= System.out.println("Insufficient funds") ; } //- // Adds deposit amount to balance. //- Chapter 7: Object-Oriented Design 109 public void deposit (double amount) { balance += amount; } /- // Returns balance. //-- public double getBalance() { return balance; // // Returns a string containing the name, //--- public String toString () { account number, and balance. return "Name:" name "\nAccount Number: %3D + acctNum + "\nBalance: " + balance; } }
public String toString ()
{
return "Name:"
name
+
"\nAccount Number:
+ acctNum
+
"\nBalance:
" + balance;
}
}
***** ****
//********
***
// TestAccount.java
//
// A simple driver to test the overloaded methods of
// the Account class.
//***
******
import java.util.Scanner;
public class TestAccount
{
public static void main(String[] args)
String name;
double balance;
long acctNum;
Account acct;
Scanner scan = new Scanner(System.in);
System.out.println("Enter account holder's first name");
scan.next();
acct = new Account (name);
System.out.println ("Account for
System.out.println(acct);
name
%3D
+ name
": ");
System.out.println("\nEnter initial balance");
balance = scan.nextDouble ();
new Account (balance,name);
System.out.println( "Account for
System.out.println(acct);
acct =
+ ": ");
%3D
+
name
110
Chapter 7: Object-Oriented Design
System.out.println ("\nEnter account number");
acctNum = scan.nextLong();
acct = new Account (balance,name,acctNum);
System.out.println("Account for "
System.out.println(acct);
+ name
+ ":");
System.out.print("\nDepositing 100 into account, balance is now ");
acct.deposit(100);
System.out.println(acct.getBalance());
System.out.print("\nWithdrawing $25, balance is now ");
acct.withdraw(25);
System.out.println(acct.getBalance ());
System.out.print("\nWithdrawing $25 with $2 fee, balance is now ");
acct.withdraw (25,2);
System.out.println (acct.getBalance ());
System.out.println("\nBye!");
}
Transcribed Image Text:public String toString () { return "Name:" name + "\nAccount Number: + acctNum + "\nBalance: " + balance; } } ***** **** //******** *** // TestAccount.java // // A simple driver to test the overloaded methods of // the Account class. //*** ****** import java.util.Scanner; public class TestAccount { public static void main(String[] args) String name; double balance; long acctNum; Account acct; Scanner scan = new Scanner(System.in); System.out.println("Enter account holder's first name"); scan.next(); acct = new Account (name); System.out.println ("Account for System.out.println(acct); name %3D + name ": "); System.out.println("\nEnter initial balance"); balance = scan.nextDouble (); new Account (balance,name); System.out.println( "Account for System.out.println(acct); acct = + ": "); %3D + name 110 Chapter 7: Object-Oriented Design System.out.println ("\nEnter account number"); acctNum = scan.nextLong(); acct = new Account (balance,name,acctNum); System.out.println("Account for " System.out.println(acct); + name + ":"); System.out.print("\nDepositing 100 into account, balance is now "); acct.deposit(100); System.out.println(acct.getBalance()); System.out.print("\nWithdrawing $25, balance is now "); acct.withdraw(25); System.out.println(acct.getBalance ()); System.out.print("\nWithdrawing $25 with $2 fee, balance is now "); acct.withdraw (25,2); System.out.println (acct.getBalance ()); System.out.println("\nBye!"); }
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