Question: CODE IN JAVA Reconsider the following examples: BankAccount.java NegativeStartingBalance.java AccountTest.java Recall the following examples of exceptions that can affect a bank account: A negative starting
CODE IN JAVA
Reconsider the following examples:
- BankAccount.java
- NegativeStartingBalance.java
- AccountTest.java
Recall the following examples of exceptions that can affect a bank account:
- A negative starting balance is passed to the constructor.
- A negative interest rate is passed to the constructor.
- A negative number is passed to the deposit method.
- A negative number is passed to the withdraw method.
- The amount passed to the withdraw method exceeds the accounts balance.
In this, you will create exceptions that represent the remaining 4 error conditions by extending the Exception class. Name your classes as follows:
- NegativeInterest.java
- NegativeDeposit.java
- NegativeWithdraw.java
- AmountWithdrawExceeds.java
Write a driver program to test all your exception classes.
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- BankAccount.java
/**
The BankAccount class simulates a bank account.
*/
public class BankAccount{
private double balance; // Account balance
/**
This constructor sets the starting balance
at 0.0.
*/
public BankAccount(){
balance = 0.0;
}
/**
This constructor sets the starting balance
to the value passed as an argument.
@param startBalance The starting balance.
@exception NegativeStartingBalance When
startBalance is negative.
*/
public BankAccount(double startBalance) throws NegativeStartingBalance{
if (startBalance < 0)
throw new NegativeStartingBalance(startBalance);
balance = startBalance;
}
/**
This constructor sets the starting balance
to the value in the String argument.
@param str The starting balance, as a String.
*/
public BankAccount(String str){
balance = Double.parseDouble(str);
}
/**
The deposit method makes a deposit into
the account.
@param amount The amount to add to the
balance field.
*/
public void deposit(double amount){
balance += amount;
}
/**
The deposit method makes a deposit into
the account.
@param str The amount to add to the
balance field, as a String.
*/
public void deposit(String str){
balance += Double.parseDouble(str);
}
/**
The withdraw method withdraws an amount
from the account.
@param amount The amount to subtract from
the balance field.
*/
public void withdraw(double amount){
balance -= amount;
}
/**
The withdraw method withdraws an amount
from the account.
@param str The amount to subtract from
the balance field, as a String.
*/
public void withdraw(String str){
balance -= Double.parseDouble(str);
}
/**
The setBalance method sets the account balance.
@param b The value to store in the balance field.
*/
public void setBalance(double b){
balance = b;
}
/**
The setBalance method sets the account balance.
@param str The value, as a String, to store in
the balance field.
*/
public void setBalance(String str){
balance = Double.parseDouble(str);
}
/**
The getBalance method returns the
account balance.
@return The value in the balance field.
*/
public double getBalance(){
return balance;
}
}
- NegativeStartingBalance.java
/**
NegativeStartingBalance exceptions are thrown by the
BankAccount class when a negative starting balance is
passed to the constructor.
*/
public class NegativeStartingBalance extends Exception{
/**
This constructor uses a generic
error message.
*/
public NegativeStartingBalance(){
super("Error: Negative starting balance");
}
/**
This constructor specifies the bad starting
balance in the error message.
@param The bad starting balance.
*/
public NegativeStartingBalance(double amount){
super("Error: Negative starting balance: " + amount);
}
}
- AccountTest.java
/**
This program demonstrates how the BankAccount
class constructor throws custom exceptions.
*/
public class AccountTest{
public static void main(String [] args){
// Force a NegativeStartingBalance exception.
try{
BankAccount account = new BankAccount(-100.0);
}catch(NegativeStartingBalance e){
System.out.println(e.getMessage());
}
}
}
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