Trying to learn classes.

[Justice Smith]

Here I am again. Trying to create this first class (Bank Account), then use it in class (Tester). It tells me it can't recognize variable "balance" when I try to compile class Tester.

public class BankAccount
{
    public BankAccount(double b, String n)
    {
        balance = b;
        name = n;
    }
    
    public void deposit(double d)
    {
        balance += d;
    }
    
    public void withdraw(double w)
    {
        balance -= w;
    }
    
    public double balance;
    public String name;
}

import java.io.*;
import java.util.*;
public class Tester
{
    public static void main(String args[])
    {
        Scanner kbReader = new Scanner(System.in);
        System.out.print("Please enter the initial deposit: ");
        double i = kbReader.nextDouble();
        BankAccount myAccount = new BankAccount(i, "Austin Eudy");
        myAccount.deposit(505.22);
        System.out.println("Current Balance: $" + balance);
        myAccount.withdraw(100.0);
        System.out.println("The Austin Eudy account balance is, $" + balance + ".");
    }
}

I don't know what I'm doing wrong, but it says it can't recognize the variable "balance" in the second set of code.

[Paweł Baczyński]

It is because there is no variable balance in your Tester class.
If you want to print the balance of your account use myAccount.balance.

[Amruta nikam]

Justice Smith wrote:Here I am again. Trying to create this first class (Bank Account), then use it in class (Tester). It tells me it can't recognize variable "balance" when I try to compile class Tester.

public class BankAccount
{
    public BankAccount(double b, String n)
    {
        balance = b;
        name = n;
    }
    
    public void deposit(double d)
    {
        balance += d;
    }
    
    public void withdraw(double w)
    {
        balance -= w;
    }
    
    public double balance;
    public String name;
}

import java.io.*;
import java.util.*;
public class Tester
{
    public static void main(String args[])
    {
        Scanner kbReader = new Scanner(System.in);
        System.out.print("Please enter the initial deposit: ");
        double i = kbReader.nextDouble();
        BankAccount myAccount = new BankAccount(i, "Austin Eudy");
        myAccount.deposit(505.22);
        System.out.println("Current Balance: $" + balance);
        myAccount.withdraw(100.0);
        System.out.println("The Austin Eudy account balance is, $" + balance + ".");
    }
}

I don't know what I'm doing wrong, but it says it can't recognize the variable "balance" in the second set of code.

Hi use myAccount.balance instead of balance inside system.out.println

however its not the way to access variables.... read about getters and setters...so whenever outside the class you are trying to access or chnage the value of any variable you should access it through getters and chnage it by using setters
google it you can find so many tutorials on it...

and you are getting that error because you are trying to access non static variable inside static method(here main())

[Justice Smith]

Thanks to both of you, got it fixed!

[Campbell Ritchie]

How did you fix it?
SW is right to say to use getter methods. I would probably not use set methods in a bank class myself, only deposit and withdraw methods. The balance field should be private.
There is a temptation to fix “non‑static” compiler errors by marking things static. That might sort out the compiler error, but usually makes the design much worse.