class Person

package com.company;

public class Person {

    private String name;
    private int age;
    private boolean isMan;

    public Person(String name, int age, boolean isMan) {
        this.setName(name);
        this.setAge(age);
        this.isMan = isMan;
    }

    private void setName(String name) {
        if (name == null || name.isEmpty()) {
            throw new IllegalArgumentException("Name cannot be null.");
        }
        this.name = name;
    }

    private void setAge(int age) {
        if (age < 0) {
            throw new IllegalArgumentException("Age cannot be negative number.");
        }
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public boolean isMan() {
        return isMan;
    }

    public void showPersonInfo() {
        System.out.println(String.format("Name: %s%n" +
                "Age: %d", this.name, this.age));
        if (isMan) {
            System.out.println(String.format("Sex: male%n"));
        } else {
            System.out.println(String.format("Sex: female%n"));
        }
    }

    public void  showStudentInfo() {}
    public void showEmployeeInfo() {}
    public double calculateOvertime(double hours) { return 0.0; }
}