/* Exercise from "Java Certification Exam Guide" by Barry Boone p 263

   Re-write the class Account example to provide synchronized access
   for the 'balance' variable
*/

class Account {
    private double balance;             // make variable private
    
    // write synchronized accessor methods
    public synchronized void setBalance(double b) {
        balance = b;
    }
    
    public synchronized double getBalance() {
        return balance;
    }
    
    // modify update method to use accessor methods
    synchronized void updateBalance(double amount) {
    //    double b = getBalance();
        setBalance( getBalance() + amount);
    }
}