Answer to Question #342598 in Java | JSP | JSF for Kirti

Question

Write a Java program to declare a Class named as Student which contains roll number,

name and course as instance variables and input_Student () and display_Student () as 

 instance methods. A derived class Exam is created from the class Student . The derived 

 class contains mark1, mark2, mark3 as instance variables representing the marks of three 

 subjects and input_Marks () and display_Result () as instance methods. Create an array of 

 objects of the Exam class and display the result of 5 students

Answer 1

class Student {
    private int roll_number;
    private String name;
    private int course;

    public void input_Student(int roll_number, String name, int course) {
        this.roll_number = roll_number;
        this.name = name;
        this.course = course;
    }

    public void display_Student() {
        System.out.println("* Roll number: " + roll_number);
        System.out.println("* Name: " + name);
        System.out.println("* Course: " + course);
    }
}

class Exam extends Student {
    private int mark1;
    private int mark2;
    private int mark3;

    public void input_Marks(int mark1, int mark2, int mark3) {
        this.mark1 = mark1;
        this.mark2 = mark2;
        this.mark3 = mark3;
    }

    public void display_Marks() {
        System.out.println("* Mark 1: " + mark1);
        System.out.println("* Mark 2: " + mark2);
        System.out.println("* Mark 3: " + mark3);
    }
}


public class Main {
    public static void main(String[] args) {
        Exam[] exams = new Exam[5];
        exams[0] = new Exam();
        exams[0].input_Student(5263, "John Kennedy", 1);
        exams[0].input_Marks(95, 85, 80);
        exams[1] = new Exam();
        exams[1].input_Student(6374, "Martha Wales", 1);
        exams[1].input_Marks(90, 70, 75);
        exams[2] = new Exam();
        exams[2].input_Student(2957, "Jim Parker", 2);
        exams[2].input_Marks(75, 60, 80);
        exams[3] = new Exam();
        exams[3].input_Student(2456, "Lora Smith", 3);
        exams[3].input_Marks(80, 80, 70);
        exams[4] = new Exam();
        exams[4].input_Student(2733, "Tom Gates", 2);
        exams[4].input_Marks(70, 65, 65);
        for (int i = 0; i < exams.length; i++) {
            System.out.println("STUDENT # " + (i + 1) + ":");
            exams[i].display_Student();
            exams[i].display_Marks();
            System.out.println();
        }
    }
}