Notes

public class Person {
// Fields
private static int idCounter = 0;
private final int id;
private String name;
private String birthday;
private String ssn;
private float grossIncome;

// Constructor
public Person() {
idCounter++;
id = idCounter;
}

// Setters
public boolean setName(String name) {
if (name == null || !name.matches("^[a-zA-Z ]+$")) {
return false;
}
this.name = name.trim();
return true;
}

public boolean setBirthday(String birthday) {
if (birthday == null || !birthday.matches("^\d{4}/\d{2}/\d{2}$")) {
return false;
}
String[] parts = birthday.split("/");
int year = Integer.parseInt(parts[0]);
int month = Integer.parseInt(parts[1]);
int day = Integer.parseInt(parts[2]);
if (year < 1900 || year > 2100 || month < 1 || month > 12 || day < 1 || day > 31) {
return false;
}
this.birthday = birthday;
return true;
}

public boolean setSSN(String ssn) {
if (ssn == null || !ssn.matches("^\d{3}-\d{2}-\d{4}$")) {
return false;
}
this.ssn = ssn;
return true;
}

public boolean setGrossIncome(float grossIncome) {
if (grossIncome < 0) {
return false;
}
this.grossIncome = grossIncome;
return true;
}

// Getters
public int getId() {
return id;
}

public float getGrossIncome() {
return grossIncome;
}

// toString
public String toString() {
String maskedSSN = ssn.substring(0, 7) + "xxxx";
return name + " " + maskedSSN + " " + birthday.substring(0, 4) + "/**/**";
}

// Deduction
public double deduction(Family family) {
return 0.0;
}
}