public class Developer {

    private long id;
    private String firstName;
    private String lastName;
    private String position;
    private double salary;

    public Developer(long id, String firstName, String lastName, String position, double salary) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.position = position;
        this.salary = salary;
    }

    @Override
    public String toString() {
        return id + ", " + firstName + ", " + lastName + ", " + position + ", " + salary;
    }

    public Developer() {
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getPosition() {
        return lastName;
    }

    public void setPosition(String position) {
        this.position = position;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

}

   public class DeveloperDAO {

       public Developer save(Developer developer){
        developer.getId();
        developer.getFirstName();
        developer.getLastName();
        developer.getPosition();
        developer.getSalary();

        System.out.println(developer.toString());
        return developer;
    }

    public Developer getAll() {
        try {
            // find the file with the developer date
            File devFile = new File("test.txt");

            Scanner devScanner = new Scanner(devFile);

            while (devScanner.hasNext()) {
                Developer developer = new Developer();
                String nextLine = devScanner.nextLine();
                String[] devData = nextLine.split(",");

                developer.setId((Long.parseLong(devData[0])));
                developer.setFirstName(devData[1]);
                developer.setLastName(devData[2]);
                developer.setPosition(devData[3]);
                developer.setSalary(Double.parseDouble(devData[4]));
                System.out.println(developer.toString());

            }
            System.out.println();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }


    public void deleteById(Long id){
       // ???
    }

    public void delete(Developer developer){
       //????
    }


    public Developer getById(Long id) {
        try {
            // find the file with the developer date
            File devFile = new File("test.txt");

            Scanner devScanner = new Scanner(devFile);

            while (devScanner.hasNext()) {
                Developer developer = new Developer();
                String nextLine = devScanner.nextLine();
                String[] devData = nextLine.split(",");
                developer.setId((Long.parseLong(devData[0])));
                developer.setFirstName(devData[1]);
                developer.setLastName(devData[2]);
                developer.setPosition(devData[3]);
                developer.setSalary(Double.parseDouble(devData[4]));

                if (id != null && id == developer.getId()){
                    System.out.println(developer.toString());
                }
                return developer;
            }
        } catch (FileNotFoundException e) {
            System.out.println("File not found");
        }
        return null;
    }


    public void update(Developer developer) {

        Writer writer = null;
        String str = developer.toString();
        try {
            writer = new FileWriter("test.txt",true);
            writer.write(str);

            writer.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}