java how to program exercise 3.12

java how to program exercise 3.12
public class AccountTest {

public static void main(String[] args) {

Account account1 = new Account(50.00);
Account account2 = new Account(-7.53);

System.out.printf("account1 balance: $%.4f \n",account1.getBalance());
System.out.printf("account2 balance: $%.4f \n\n", account2.getBalance());

Scanner input = new Scanner(System.in);

double depositAmount;
double debitamount;


System.out.print("Enter deposit amount for account1: ");
depositAmount = input.nextDouble();

System.out.printf("\nadding %.2f to account1 balance\n\n", depositAmount);
account1.credit(depositAmount);

System.out.printf("account1 balance: $%.2f \n", account1.getBalance());
System.out.printf("account2 balance: $%.2f \n\n",account2.getBalance());

System.out.print("Enter deposit amount for account2: ");
depositAmount = input.nextDouble();
System.out.printf("\nadding %.2f to account2 balance\n\n",depositAmount);
account2.credit(depositAmount);

System.out.printf("account1 balance: $%.2f \n",account1.getBalance());
System.out.printf("account2 balance: $%.2f \n",account2.getBalance());

System.out.println("enter debit amount from account1");
debitamount = input.nextDouble();
System.out.printf("subtructing %.2f from acount1\n",debitamount);
account1.debit(debitamount);

System.out.printf("account1 balance: $%.2f \n",account1.getBalance());
System.out.printf("account2 balance: $%.2f \n",account2.getBalance());

System.out.println("enter debit amount from account2");
debitamount=input.nextDouble();
System.out.printf("subtructing %.2f from account2 \n",debitamount);
account2.debit(debitamount);

System.out.printf("account1 balance: $%.2f \n",account1.getBalance());
System.out.printf("account2 balance: $%.2f \n",account2.getBalance());

}

}//end class

class Account {

private double balance;

public Account(double initialBalance) {
if (initialBalance (user greater sign here) 0.0) {
balance = initialBalance;
}
}

public void credit(double amount) {
balance = balance + amount;
}

public void debit(double amount)
{
if(amount(user less than sign here)balance)
{
balance = balance-amount;
}
else
{
System.out.println("Debit amount exceeded account balance");
}
}

public double getBalance() {
return balance;
}

}