Thread: I NEED HELP Q-Q

ok guys i need a lot of help in short x-x idk how to add my interest rate to my balance using class(1) and method (4). I am lost while doing my homework. Now it turned into a chunk of confusion java program by using JOptionPane

//This is my Saving account
import java.text.DecimalFormat;

public class SavingAccount
{
private DecimalFormat dollar = new DecimalFormat("#,###.00");
private double balance;
private double interestRate;
private double interest; //interest earned

// Contructor to set the starting balance
public SavingAccount()
{
balance = 0.0;
}
public SavingAccount(double startBalance, double rate)
{
balance = startBalance;
interestRate = (rate / 12) / 100;
interest = 0.0;
}

public SavingAccount(String str)
{
balance = Double.parseDouble(str);
}

// Methods for Annual interest rate
public void setInterestRate()
{
interest = balance * interestRate;
balance += interest;
}
public double doInterest()
{
return interest;
}

// Methods for Deposit
public void doDeposit(double amount)
{
balance += amount;
}

public void doDeposit(String str)
{
balance += Double.parseDouble(str);
}

// Methods for Wit3hdrawal
public void doWithdrawal(double amount)
{
balance -= amount;
}

public void doWithdrawal(String str)
{
balance -= Double.parseDouble(str);
}

public double getBalance()
{
return balance;
}
}

//And this is my Saving accountdemo

import javax.swing.JOptionPane;
import java.text.DecimalFormat;

public class SavingAccountDemo
{
public static void main(String[] args)
{

DecimalFormat dollar = new DecimalFormat("#,###.00");

//To make the final output work
double interestTotal = 0;
double depositTotal = 0;
double withdrawalTotal = 0;

// Annual Interest rate input
String interestRate = JOptionPane.showInputDialog("Enter annual interest rate as percent: ");
double annualRate = Double.parseDouble( interestRate );

// Starting Balance input
String balance = JOptionPane.showInputDialog("Enter starting balance: ");
SavingAccount account = new SavingAccount( balance,interestRate );

// Numbers of months since the account opened
String numberMonth = JOptionPane.showInputDialog("Enter numbers of months since account opened: ");
int month = Integer.parseInt( numberMonth );

account.setInterestRate(annualRate);

JOptionPane.showMessageDialog(null, "You will be asked to enter\n" +
" deposit and withdrawal for each month\n" +
" for " + month + " months.");

for (int count = 1; count <= month ;count++)
{

// Deposit the user's pay into the account.
String stringDeposit = JOptionPane.showInputDialog("Enter Deposit for month-" + count + ":");
double deposit = Double.parseDouble( stringDeposit );

// Withdraw some cash from the account.
String stringWithdrawal = JOptionPane.showInputDialog("Enter withdrawal for month-" + count + ":");
double withdrawal = Double.parseDouble( stringWithdrawal );

// Update

depositTotal = deposit + depositTotal;
withdrawalTotal = withdrawal + withdrawalTotal;
account.setInterestRate();


// Output for deposit, withdrawal, etc.
JOptionPane.showMessageDialog(null,
"For month-" + count +
"\nDeposit is: $" + dollar.format(deposit) +
"\nWithdrawal is: $" + dollar.format(withdrawal) +
"\nMonth Interest is: $" dollar.format(account.doInterest) +
"\nBalance is: $" + balance);

}

JOptionPane.showMessageDialog(null,"For " + month + " month(s)" +
"\nEnding Balance is: $" + finalBalance +
"\nTotal for deposits is: $" + dollar.format(depositTotal) +
"\nTotal for withdrawals is: $" + dollar.format(withdrawalTotal) +
"\nTotal for interest is: $" + dollar.format(interestTotal);


System.exit(0);
}
}

The point is I'm having trouble with idk how to add my withdrawal, deposit and interestrate to my balance x-x Once you guys read this and fix it. Please explain to me how u guys fix it. THANK YOU

Use code tags when posting to make everything nice and clean.
[code=java] Place code in here[/code]

As for your code I doubt anyone will just fix it we will however guide you in the right direction.

You must understand what Objects are and how to use them. For example when you create a String it has methods you can use. How do you access those methods? An Object usually has constructors, Accessors/Mutators (getters/setters), and methods.

Just skimming through the SavingAccount class you seem to be on the right track but as I said place it in the code tags to make it easier to read. When asking questions ask exactly what you are having trouble with and don't post code and expect people to "fix" it for you as that is not what the forums are for.