Complete the Course class by implementing the printRoster() method, which outputs a list of all students enrolled in a course and also the total number of students in the course. Given classes: Class Course represents a course, which contains an ArrayList of Student objects as a course roster. (Type your code in here) Class Student represents a classroom student, which has three fields: first name, last name, and GPA. (Hint: toString() returns a String representation of the Student object.) Ex: If the following students and their GPA values are added to a course: Henry Cabot with 3.5 GPA Brenda Stern with 2.0 GPA Jane Flynn with 3.9 GPA Lynda Robison with 3.2 GPA then the program output is: Henry Cabot (GPA: 3.5) Brenda Stern (GPA: 2.0) Jane Flynn (GPA: 3.9) Lynda Robison (GPA: 3.2) Students: 4 course.java import java.util.ArrayList; // Class representing a student public class Course { private ArrayList roster; // Collection of Student objects public Course() { roster = new ArrayList(); } // Output each student in the course roster, and then the total size of the course public void printRoster() { /* Type your code here */ } public void addStudent(Student s) { roster.add(s); } // main 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(); } } student.java import java.text.DecimalFormat; // 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) + ")"; } }
Complete the Course class by implementing the printRoster() method, which outputs a list of all students enrolled in a course and also the total number of students in the course.
Given classes:
- Class Course represents a course, which contains an ArrayList of Student objects as a course roster. (Type your code in here)
- Class Student represents a classroom student, which has three fields: first name, last name, and GPA. (Hint: toString() returns a String representation of the Student object.)
Ex: If the following students and their GPA values are added to a course:
Henry Cabot with 3.5 GPA
Brenda Stern with 2.0 GPA
Jane Flynn with 3.9 GPA
Lynda Robison with 3.2 GPA
then the program output is:
Henry Cabot (GPA: 3.5) Brenda Stern (GPA: 2.0) Jane Flynn (GPA: 3.9) Lynda Robison (GPA: 3.2) Students: 4
course.java
import java.util.ArrayList;
// Class representing a student
public class Course {
private ArrayList<Student> roster; // Collection of Student objects
public Course() {
roster = new ArrayList<Student>();
}
// Output each student in the course roster, and then the total size of the course
public void printRoster() {
/* Type your code here */
}
public void addStudent(Student s) {
roster.add(s);
}
// main
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();
}
}
student.java
import java.text.DecimalFormat;
// 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) + ")";
}
}
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 2 images
