Question

Locate your Student project from the previous in-class assignment. You will add a new class to that project.

1. Create a class called Course. It should have a field to hold an ArrayList of Student objects.

2. Create a constructor for Course that accepts an ArrayList of Student objects, and set field to the parameter.

3. In the Course class, create a method called addStudent(Student s). This should add the parameter "s" to the ArrayList of Student objects.

4. In the Course class, create a method called removeStudent(Student s). This method should remove the parameter"s" from the ArrayList of Student objects.

5. In the Course class, create a method called toString(). This method should return a String showing the information from all the Student objects in the ArrayList. It should be formatted in the following way:

"Student 0: *Student 0 toString()*

Student 1: *Student 1 toString()*

...

Student n: *Student n toString()*"

This method should call each Student object's toString() method, as shown in the above example.

MY CODE :

student.java

package student;

public class Student {

  
public static void main(String[] args) {
  
  
Course myNewCourse = new Course(2) ;

System.out.println(myNewCourse.toString());
}
  
private int idNum;
private String firstN;
private String lastN;
  
public Student(int studentId, String firstName, String lastName ){   
idNum = studentId;
firstN = firstName;
lastN = lastName;
}
  
public String toString(){   
  
String allData = "Student"+"1"+":ID: "+getIdNum()+ ", First name: "
+ getFirstName()+ ", Last name: " +getLastName()+ "." ;
  

return allData;
}
  
public void setIdNum(int studentId){
  
this.idNum = studentId;
  
  
  
}
  
public void setFirstName(String firstName){
  
this.firstN = firstName;
  
  
}
  
public void setLastName(String lastName){
  
this.lastN = lastName;
  
}
  
public int getIdNum(){
  
  
return idNum;
  
}
  
  
public String getFirstName(){
  
return firstN;
  
}
  
public String getLastName() {
  
return lastN;
}
}

course.java

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package student;

import java.util.ArrayList;

/**
*
* @author farha
*/
public class Course {
  
ArrayList<Student> students = new ArrayList<Student>();
  
  
  
public Course(ArrayList<Student> students){
  
this.students = students;
  
  
}
  
public void addStudent(Student s){
  
students.add(0, s);
  
  
  
}
  
public void removeStudent(Student s){
  
students.remove(s);
  
}
  
public String toString(){
  
String information = ("");
  

return information;
}
  
  
  
}

Answer 1

Thanks for the question.

Below is the code you will be needing  Let me know if you have any doubts or if you need anything to change.

Thank You !!

===========================================================================


import java.util.ArrayList;

public class Student {


    private int idNum;
    private String firstN;
    private String lastN;

    public Student(int studentId, String firstName, String lastName) {
        idNum = studentId;
        firstN = firstName;
        lastN = lastName;
    }

    public String toString() {

        String allData = "Student" + "1" + ":ID: " + getIdNum() + ", First name: "
                + getFirstName() + ", Last name: " + getLastName() + ".";


        return allData;
    }

    public void setIdNum(int studentId) {

        this.idNum = studentId;


    }

    public void setFirstName(String firstName) {

        this.firstN = firstName;


    }

    public void setLastName(String lastName) {

        this.lastN = lastName;

    }

    public int getIdNum() {


        return idNum;

    }


    public String getFirstName() {

        return firstN;

    }

    public String getLastName() {

        return lastN;
    }

    public static void main(String[] args) {

        ArrayList<Student> students = new ArrayList<Student>();
        students.add(new Student(1, "Barack", "Obama"));
        students.add(new Student(2, "Marsha", "Walker"));
        students.add(new Student(3, "David", "Lisenko"));
        Course myNewCourse = new Course(students);

        System.out.println(myNewCourse.toString());
    }
}

==================================================================

import java.util.ArrayList;

/**
 * @author farha
 */
public class Course {

    //1. Create a class called Course. It should have a field to hold an ArrayList of Student objects.
    ArrayList<Student> students = new ArrayList<Student>();


    //2. Create a constructor for Course that accepts an ArrayList of Student objects, and set field to the parameter.
    public Course(ArrayList<Student> students) {

        this.students = students;


    }

    //3. In the Course class, create a method called addStudent(Student s).
    // This should add the parameter "s" to the ArrayList of Student objects.
    public void addStudent(Student s) {

        students.add(s);


    }

    //4. In the Course class, create a method called removeStudent(Student s).
    // This method should remove the parameter"s" from the ArrayList of Student objects.
    public void removeStudent(Student s) {

        students.remove(s);

    }

    //5. In the Course class, create a method called toString().
    // This method should return a String showing the information from all
    // the Student objects in the ArrayList. It should be formatted in
    // the following way:
    public String toString() {

        String information = ("");

        for (int i = 0; i < students.size(); i++) {
            information += "Student " + i + ": " + students.get(i) + "\n";
        }

        return information;
    }


}

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