Osoba z najwyższym dochodem - program

public class Person {

    String name;
    String surname;
    long pesel;
    String city;

    public Person(String name, String surname, long pesel, String city) {
        this.name = name;
        this.surname = surname;
        this.pesel = pesel;
        this.city = city;
    }

    public String getName() {
        return name;
    }

    public String getSurname() {
        return surname;
    }

    public long getPesel() {
        return pesel;
    }

    public String getCity() {
        return city;
    }

    public String toString(){
        return name + " " + surname + ", PESEL: " + pesel + " city: " + city;
    }
}

public class Employee extends Person {

    String position;
    int salary;

    public Employee(String name, String surname, long pesel, String city, String position, int salary) {
        super(name, surname, pesel, city);
        this.position = position;
        this.salary = salary;
    }

    public String getPosition() {
        return position;
    }

    public int getSalary() {
        return salary;
    }
    public int getIncome() {
        return salary;
    }

    @Override
    public String toString(){
        return name + " " + surname + ", PESEL: " + pesel + " city: " + city + " position: " + position + " salray: " + salary + " PLN";
    }
}


public class Student extends Person {

    int group;
    int scholarship;

    public Student(String name, String surname, long pesel, String city, int group, int scholarship) {
        super(name, surname, pesel, city);
        this.group = group;
        this.scholarship = scholarship;
    }

    public int getGroup() {
        return group;
    }

    public int getScholarship() {
        return scholarship;
    }

    public int getIncome() {
        return scholarship;
    }

    @Override
    public String toString() {
        return name + " " + surname + ", PESEL: " + pesel + " city: " + city + " group: " + group + " scholarship: " + scholarship + " PLN";
    }
}

public class Test {
    public static void main(String[] args) {

        Person [] persons = new Person[4];
        persons[0] = new Student("Maciek", "Szczebla", 98012238475L, "Wrocław", 2, 750);
        persons[1] = new Student("Wojtek", "Okno", 98122557204L, "Bytom", 1, 650);
        persons[2] = new Employee("Albert", "Wiatr", 78031139475L, "Hel", "Fisherman", 4000);
        persons[3] = new Employee("Kazimierz", "Stonoga", 66092929364L, "Lublin", "Fireman", 4500);

        for (Person p : persons){
            System.out.println(p);
        }
    }
}

interface Earner {
    int getIncome(); 
}

public class Student extends Person implements Earner {
    // ... inny kod

    @Override 
    public int getIncome() {
        return scholarship;
    }
}

public class Employee extends Person implements Earner {
    // ... inny kod

    @Override
    public int getIncome() {
        return salary;
    }
}

Earner[] earners = new Earner[4];
// ... dorzuć instancje

for (Earner r: earners) {
    int income = r.getIncome();
    // dorzuć logikę znajdującą najwyższą wypłatę
}

public Person(String name, String surname, long pesel, String city) {
    this.name = name;
    this.surname = surname;
    this.pesel = pesel;
    this.city = city;
}

public int getIncome() {
    return 0;
}

for (Earner r : earners) {
        int income = r.getIncome();
        if (earners[r] > income) { // tutaj wysakuje błąd na literce [r] - niezgodne typy
            income = r.getIncome();
        }
        System.out.println(income);
    }

public class Test {
    public static void main(String[] args) {

        Earner[] person = new Earner[5];
        person[0] = new Student("Maciek", "Szczebla", 98012238475L, "Wrocław", 2, 750);
        person[1] = new Student("Wojtek", "Okno", 98122557204L, "Bytom", 1, 1650);
        person[2] = new Employee("Albert", "Wiatr", 78031139475L, "Hel", "Fisherman", 5000);
        person[3] = new Employee("Kazimierz", "Stonoga", 66092929364L, "Lublin", "Fireman", 4500);
        person[4] = new Student("Magda", "Kachniarz", 88153329159L, "Warszawa", 5,20000); // Poprawić pesel bo jak jest 00.. to jest error;

        for (Earner r : person) {
            System.out.println(r);
        }

        int richest = person[0].getIncome();
        for (Earner earner : person) {
            if (earner.getIncome() > richest) {
                richest = earner.getIncome();
            }
        }
        for (int i = 0; i < person.length; i++) {
            if (richest == person[i].getIncome()) {
                System.out.println("\nNajwiększy dochód ma: " + person[i].getNameAndSurname() + " " + richest + " PLN");
            }
        }
    }
}

public class Pesel{
private final String pesel;
   public Pesel(String pesel){
      //tutaj jakaś walidacja, długość, znaki, suma kontrolna
      this.pesel = pesel;
}

//nadpisanie metody toString z Object
   @Override
   public String toString(){
      return pesel;
   }
}