Practice how to inherit a class in Java

Java Online Editor

public class ExampleApp {

    public static void main(String[] args) {

        Student studentObj = new Student(); // studentObj is the object of the Student class

        studentObj.setName("John"); // assign value to class property
        studentObj.setAge(15); // assign value to class property
        studentObj.setStudentId(11);

        System.out.println(studentObj.getName() + " is " + studentObj.getAge() + " years old. His student id is " + studentObj.getStudentId() + ".");
    }
}

// Person class is the base (parent) class
class Person {
    private String name;
    private int age;

    // Getter and setter methods for name property
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    // Getter and setter methods for age property
    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

// Student class is the derived (child) class inheriting from the base (Person) class
class Student extends Person { //Inherit Person class
    private int studentId;

    // Getter and setter methods for studentId property
    public int getStudentId() {
        return studentId;
    }

    public void setStudentId(int studentId) {
        this.studentId = studentId;
    }
}