Revise the Course class as follows: -The array size is fixed in listing 10.6. Im

Question

Revise the Course class as follows: -The array size is fixed in listing 10.6. Improve it to automatically increase the array size by creating a new larger array and copying the contents of the current array to it. -Implement the dropStudent method. -Add a new method named clear() that removes all students from the course. Write a test program that creates a course, add three student, removes one, and displays the students in the course. Here's listing 10.6: public class Course { private String courseName; private String[] students = new String[100]; private int numberOfStudents; public Course(String courseName) { this.courseName = courseName; } public void addStudent(String student) { students[numberOfStudents] = student; numberOfStudents++; } public String[] getStudents() { return students; } public int getNumberOfStudents() { return numberOfStudents; } public String getCourseName() { return courseName; } public void dropStudent(String student) { // Left as an exercise in Exercise 9.9 } }

Explanation / Answer

Course.java

import java.util.ArrayList;

public class Course {
    private String courseName;
    private ArrayList<String> students = new ArrayList<String>();
    private int numberOfStudents;

    public Course(String courseName) {
        this.courseName = courseName;
        this.numberOfStudents = 0;
    }

    public void addStudent(String student) {
        numberOfStudents++;
        students.add(student);

    }

    public ArrayList<String> getStudents() {
        return students;
    }

    public int getNumberOfStudents() {
        return numberOfStudents;
    }

    public String getCourseName() {
        return courseName;
    }

    public void dropStudent(String student) {
        for (int i = 0; i < students.size(); i++) {
            if (student.equalsIgnoreCase(students.get(i))) {
                students.remove(i);
            }
        }
    }
    public void clear() {
        students.clear();
    }
}

TestCourse.java

import java.util.ArrayList;
import java.util.Scanner;

public class TestCourse {
    public static void main(String[] args) {
        String name;
        Scanner input = new Scanner(System.in);
        Course c = new Course("Math");
        c.addStudent("Mack");
        c.addStudent("Rahul");
        c.addStudent("John");

        ArrayList<String> students = c.getStudents();
        System.out.println("List of Students :");
        for (int i = 0; i < students.size(); i++) {
            System.out.println(students.get(i));
        }

        System.out
                .println(" Enter the Name of student to whome you want to drop :");
        name = input.next();
        c.dropStudent(name);

        System.out.println(" List of Students After Removal:");
        for (int i = 0; i < students.size(); i++) {
            System.out.println(students.get(i));
        }
    }
}

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