Question

I asked this a little bit ago but didn't clarify exactly what I needed, so I'm asking again...I've attached my code below the question. Thanks!

Do not change the original contract of the Course class. Instead, ONLY change the implementation of property students, from an array to and ArrayList, and update any methods in class Course that access students to reflect ArrayList. The methods are overridden. That means that you do not need to change the header for methods, only the body of the method. The method signature remains public String[] getStudents() but the body of the method will remove the strings from the ArrayList put them in an Array of String and return the Array of String. A testfile- Exercise11_05.java has been provided for your use on Blackboard. DO NOT alter the testfile Exercise11_05.java. Contract – all method names, method parameters, and method return types must stay the same. This problem is an exercise in abstraction and encapsulation

import java.util.*;

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

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

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

public String[] getStudents() {
return students;
}

public int getNumberOfStudents() {
return numberOfStudents;
}

public String getCourseName() {
return courseName;
}

}

//Course Test code...should not be altered.

import java.util.*;

public class CourseTest {
public static void main(String[] args) {
Course course1 = new Course("Data Structures");
Course course2 = new Course("Database Systems");

course1.addStudent("Peter Jones");
course1.addStudent("Brian Smith");
course1.addStudent("Anne Kennedy");

course2.addStudent("Peter Jones");
course2.addStudent("Steve Smith");

System.out.println("Number of students in course1: "
+ course1.getNumberOfStudents());
ArrayList students = course1.getStudents();
for (int i = 0; i < course1.getNumberOfStudents(); i++)
System.out.print(students[i] + ", ");

System.out.println();
System.out.print("Number of students in course2: "
+ course2.getNumberOfStudents());
}
}

Answer 1

import java.util.*;

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

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

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

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

public int getNumberOfStudents() {
return numberOfStudents;
}

public String getCourseName() {
return courseName;
}

}

__________________________________________

//Course Test code...should not be altered.

import java.util.*;

public class CourseTest {
public static void main(String[] args) {
Course course1 = new Course("Data Structures");
Course course2 = new Course("Database Systems");

course1.addStudent("Peter Jones");
course1.addStudent("Brian Smith");
course1.addStudent("Anne Kennedy");

course2.addStudent("Peter Jones");
course2.addStudent("Steve Smith");

System.out.println("Number of students in course1: "
+ course1.getNumberOfStudents());
ArrayList students = course1.getStudents();
for (int i = 0; i < course1.getNumberOfStudents(); i++)
System.out.print(students.get(i) + ", ");

System.out.println();
System.out.print("Number of students in course2: "
+ course2.getNumberOfStudents());
}
}

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