main is a static method. It cannot refer to balance, which is an attribute (non-static variable). balance has meaning only when it is referred through an object reference (such as myAccount.balance or yourAccount.balance). But it doesn’t have any meaning when it is referred through class (such as Account.balance (whose balance is that?))
I made some changes to your code so that it compiles.
public static void main(String[] args) {
Account account = new Account(1122, 20000, 4.5);
account.withdraw(2500);
account.deposit(3000);
and:
public void withdraw(double withdrawAmount) {
balance -= withdrawAmount;
}
public void deposit(double depositAmount) {
balance += depositAmount;
}
the lines
account.withdraw(balance, 2500);
account.deposit(balance, 3000);
you might want to make withdraw and deposit non-static and let it modify the balance
public void withdraw(double withdrawAmount) {
balance = balance – withdrawAmount;
}
public void deposit(double depositAmount) {
balance = balance + depositAmount;
}
and remove the balance parameter from the call