public class LabProgram { public static void main(String args[]) { Course course = new Course();String first; // first name String last; // last name double gpa; // grade point average first = "Henry"; last = "Cabot"; gpa = 3.5; course.addStudent(new Student(first, last, gpa)); // Add 1st student first = "Brenda"; last = "Stern"; gpa = 2.0; course.addStudent(new Student(first, last, gpa)); // Add 2nd student first = "Jane"; last = "Flynn"; gpa = 3.9; course.addStudent(new Student(first, last, gpa)); // Add 3rd student first = "Lynda"; last = "Robison"; gpa = 3.2; course.addStudent(new Student(first, last, gpa)); // Add 4th student course.printRoster();} }// Class representing a studentpublic class Student { private String first; // first nameprivate String last; // last nameprivate double gpa; // grade point average // Student class constructorpublic Student(String first, String last, double gpa) {this.first = first; // first namethis.last = last; // last namethis.gpa = gpa; // grade point average} public double getGPA() {return gpa;} public String getLast() {return last;} // Returns a String representation of the Student object, with the GPA formatted to one decimalpublic String toString() {DecimalFormat fmt = new DecimalFormat("#.0");return first + " " + last + " " + "(GPA: " + fmt.format(gpa) + ")";}} **Objective**: Implement the `printRoster()` method in the `Course` class to display a list of all students enrolled in a course, along with the total number of students.### Given Classes:- **Class LabProgram**: Contains the main method for testing the program.- **Class Course**: Represents a course containing an `ArrayList` of `Student` objects, which serves as the course roster. (Type your code in this section)- **Class Student**: Represents a student with three fields: first name, last name, and GPA.### Example:If the program has 4 students enrolled, the output will be formatted as follows:```Henry Cabot (GPA: 3.5)Brenda Stern (GPA: 2.0)Jane Flynn (GPA: 3.9)Lynda Robison (GPA: 3.2)Students: 4``` ### Java Class: CourseThis Java code snippet defines a class `Course`, which manages a collection of `Student` objects using an `ArrayList`. Below is a detailed explanation of the code structure:```javapublic class Course { private ArrayList roster; // Collection of Student objects public Course() { roster = new ArrayList(); } public void printRoster() { /* Type your code here */ } public void addStudent(Student s) { roster.add(s); }}```#### Explanation:1. **Class Declaration:** - `public class Course`: This declares a public class named `Course`.2. **Private Field:** - `private ArrayList roster;`: This is a private field named `roster` that holds a collection of `Student` objects using `ArrayList`.3. **Constructor:** - `public Course()`: This is the constructor for the `Course` class. It initializes the `roster` as a new `ArrayList` of `Student`.4. **Method - printRoster:** - `public void printRoster()`: A method intended to print the roster of students. The method body is currently empty and marked with a comment `/* Type your code here */`, indicating a place where code for printing the roster can be added.5. **Method - addStudent:** - `public void addStudent(Student s)`: A method to add a `Student` object to the `roster`. It takes a parameter `s` of type `Student` and adds it to the `roster` list using the `add` method.The `Course` class provides a basic template to manage students in a course by allowing students to be added and potentially printed. Students and additional functionality can be implemented by expanding the methods accordingly.

Create a Course object representing a course.Initialize variables first, last, and gpa to store…

Answered: Complete the Course class by…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Question

public class LabProgram {

public static void main(String args[]) {

Course course = new Course();

String first; // first name

String last; // last name

double gpa; // grade point average

first = "Henry";

last = "Cabot";

gpa = 3.5;

course.addStudent(new Student(first, last, gpa)); // Add 1st student

first = "Brenda";

last = "Stern";

gpa = 2.0;

course.addStudent(new Student(first, last, gpa)); // Add 2nd student

first = "Jane";

last = "Flynn";

gpa = 3.9;

course.addStudent(new Student(first, last, gpa)); // Add 3rd student

first = "Lynda";

last = "Robison";

gpa = 3.2;

course.addStudent(new Student(first, last, gpa)); // Add 4th student

course.printRoster();

}

// Class representing a student

public class Student {

private String first; // first name

private String last; // last name

private double gpa; // grade point average

// Student class constructor

public Student(String first, String last, double gpa) {

this.first = first; // first name

this.last = last; // last name

this.gpa = gpa; // grade point average

}

public double getGPA() {

return gpa;

}

public String getLast() {

return last;

}

// Returns a String representation of the Student object, with the GPA formatted to one decimal

public String toString() {

DecimalFormat fmt = new DecimalFormat("#.0");

return first + " " + last + " " + "(GPA: " + fmt.format(gpa) + ")";

}

**Objective**: Implement the `printRoster()` method in the `Course` class to display a list of all students enrolled in a course, along with the total number of students.

### Given Classes:

- **Class LabProgram**: Contains the main method for testing the program.
- **Class Course**: Represents a course containing an `ArrayList` of `Student` objects, which serves as the course roster. (Type your code in this section)
- **Class Student**: Represents a student with three fields: first name, last name, and GPA.

### Example:

If the program has 4 students enrolled, the output will be formatted as follows:

```
Henry Cabot (GPA: 3.5)
Brenda Stern (GPA: 2.0)
Jane Flynn (GPA: 3.9)
Lynda Robison (GPA: 3.2)
Students: 4
```

### Java Class: Course

This Java code snippet defines a class `Course`, which manages a collection of `Student` objects using an `ArrayList`. Below is a detailed explanation of the code structure:

```java
public class Course {
private ArrayList<Student> roster; // Collection of Student objects

public Course() {
roster = new ArrayList<Student>();
}

public void printRoster() {
/* Type your code here */
}

public void addStudent(Student s) {
roster.add(s);
}
}
```

#### Explanation:

1. **Class Declaration:**
- `public class Course`: This declares a public class named `Course`.

2. **Private Field:**
- `private ArrayList<Student> roster;`: This is a private field named `roster` that holds a collection of `Student` objects using `ArrayList`.

3. **Constructor:**
- `public Course()`: This is the constructor for the `Course` class. It initializes the `roster` as a new `ArrayList` of `Student`.

4. **Method - printRoster:**
- `public void printRoster()`: A method intended to print the roster of students. The method body is currently empty and marked with a comment `/* Type your code here */`, indicating a place where code for printing the roster can be added.

5. **Method - addStudent:**
- `public void addStudent(Student s)`: A method to add a `Student` object to the `roster`. It takes a parameter `s` of type `Student` and adds it to the `roster` list using the `add` method.

The `Course` class provides a basic template to manage students in a course by allowing students to be added and potentially printed. Students and additional functionality can be implemented by expanding the methods accordingly.

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