// Base class Student
class Student {
int rollno;
String name;
// Parameterized constructor
Student(int r, String n) {
rollno = r;
name = n;
}
// Method to display student details
void displayStudent() {
System.out.println("Roll No: " + rollno);
System.out.println("Name: " + name);
}
}
// Derived class Marks (inherits from Student)
class Marks extends Student {
int javaMarks;
int practicalMarks;
// Parameterized constructor
Marks(int r, String n, int jMarks, int pMarks) {
// Directly initializing parent class attributes
rollno = r;
name = n;
javaMarks = jMarks;
practicalMarks = pMarks;
}
// Method to set marks
void setMarks(int jMarks, int pMarks) {
javaMarks = jMarks;
practicalMarks = pMarks;
}
// Method to display marks
void displayMarks() {
System.out.println("Java Marks: " + javaMarks);
System.out.println("Practical Marks: " + practicalMarks);
}
}
public class StudentDemo {
public static void main(String[] args) {
// Creating an object of Marks class
Marks student1 = new Marks(101, "Aryan", 85, 90);
// Displaying student details and marks
student1.displayStudent();
student1.displayMarks();
student1.setMarks(88, 95);
System.out.println("\nUpdated Marks:");
student1.displayMarks();
}
}
Another way
import java.util.Scanner;
// Base class Student
class Student {
int rollno;
String name;
// Parameterized constructor
Student(int r, String n) {
rollno = r;
name = n;
}
// Method to display student details
void displayStudent() {
System.out.println("Roll No: " + rollno);
System.out.println("Name: " + name);
}
}
// Derived class Marks (inherits from Student)
class Marks extends Student {
int javaMarks;
int practicalMarks;
// Parameterized constructor
Marks(int r, String n, int jMarks, int pMarks) {
// Directly initializing parent class attributes
rollno = r;
name = n;
javaMarks = jMarks;
practicalMarks = pMarks;
}
// Method to set marks
void setMarks(int jMarks, int pMarks) {
javaMarks = jMarks;
practicalMarks = pMarks;
}
// Method to display marks
void displayMarks() {
System.out.println("Java Marks: " + javaMarks);
System.out.println("Practical Marks: " + practicalMarks);
}
}
// Main class
public class StudentDemo {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
// Taking user input
System.out.print("Enter Roll No: ");
int rollno = sc.nextInt();
sc.nextLine(); // Consume newline character
System.out.print("Enter Name: ");
String name = sc.nextLine();
System.out.print("Enter Java Marks: ");
int javaMarks = sc.nextInt();
System.out.print("Enter Practical Marks: ");
int practicalMarks = sc.nextInt();
// Creating an object of Marks class with user input
Marks student1 = new Marks(rollno, name, javaMarks, practicalMarks);
// Displaying student details and marks
System.out.println("\nStudent Details:");
student1.displayStudent();
student1.displayMarks();
System.out.print("\nEnter updated Java Marks: ");
javaMarks = sc.nextInt();
System.out.print("Enter updated Practical Marks: ");
practicalMarks = sc.nextInt();
student1.setMarks(javaMarks, practicalMarks);
System.out.println("\nUpdated Marks:");
student1.displayMarks();
sc.close();
}
}
