Question

JAVA

3files seprate

1.Classroom.java

2.ClassroomTester.java (provided)

3.Student.java(provided)

u are given a Stadant.clss. (Copy it into Fclipse) A Stndant. hasa name and an Array ist af grades (Doubles) as stan Write a class narned classroom which manages Student objects ou will provide the following variahles. publio classroonno-arguent constructor *publio void add (stuient s adds the student to this Classroom (to an ArrayList .publiu Srins sAvraueGredlerTMan (duble Laryel) gcts the name of the first student in the Classroom who has an average greater than the target or the empty string. Do not use break Do not return from the middic of the loop, Use a boolcan flag it ynu need to terminate early. . publiu AayLislkstring? gesudnts 0 gets an ArayLIst Strings conta nlng the names ot all the Students In this Classroom. . publie Student beststadent.) gets the Student with the highest average in this classroom or null there are no students publle string tostring0 gesng represent ion using Arraylist's toString methed Provide Javadoc

Use the following files:

ClassroomTester.java

import java.util.ArrayList;
/**
 * Write a description of class UniversityTester here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class ClassroomTester
{
public static void main(String[] args)
    {
       ArrayList<Double> grades1 = new ArrayList<>();
       grades1.add(82.0);
       grades1.add(91.5);
       grades1.add(85.0);
       Student student1 = new Student("Srivani", grades1);
      
       ArrayList<Double> grades2 = new ArrayList<>();
       grades2.add(95.0);
       grades2.add(87.0);
       grades2.add(99.0);
       grades2.add(100.0);
       Student student2 = new Student("Carlos", grades2);
       
       ArrayList<Double> grades3 = new ArrayList<>();
       grades3.add(100.0);
       grades3.add(98.0);
       grades3.add(100.0);
       grades3.add(97.0);
       Student student3 = new Student("Maria", grades3);
       
       ArrayList<Double> grades4 = new ArrayList<>();
       grades4.add(80.0);
       grades4.add(70.0);
       grades4.add(82.0);
       grades4.add(75.0);
       Student student4 = new Student("Fred", grades4);
       
       Classroom myClass = new Classroom();
       myClass.add(student1);
       myClass.add(student2);
       myClass.add(student3);
       myClass.add(student4);
       
       System.out.println(myClass);
       System.out.println("Expected: [[Student:name=Srivani,grades=[82.0, 91.5, 85.0]], [Student:name=Carlos,grades=[95.0, 87.0, 99.0, 100.0]], [Student:name=Maria,grades=[100.0, 98.0, 100.0, 97.0]], [Student:name=Fred,grades=[80.0, 70.0, 82.0, 75.0]]]");
       
       System.out.println(">90 GPA: " + myClass.hasAverageGreaterThan(90.0));
       System.out.println("Expected: Carlos");
       
       System.out.println(">99 GPA: " + myClass.hasAverageGreaterThan(99));
       System.out.println("Expected: ");
       
       Student best = myClass.bestStudent();
       if (best != null)
       {
          System.out.println(best.getName());
          System.out.println("Expected: Maria");
       }
       
       System.out.println(myClass.getStudents());
       System.out.println("Expected: [Srivani, Carlos, Maria, Fred]");
       
       //test with an empty classroom
       myClass = new Classroom();
       System.out.println(myClass);
       System.out.println("Expected: []");
       
       System.out.println(">90 GPA: " + myClass.hasAverageGreaterThan(90.0));
       System.out.println("Expected: ");
       
      
       best = myClass.bestStudent();
       if (best != null)
       {
          System.out.println(best.getName());
          
       }
       
       System.out.println(myClass.getStudents());
       System.out.println("Expected: []");
        
    }
}

Student.java

import java.util.ArrayList;
/**
 * Models a student with a name and collection
 * pf grades
 */
public class Student
{
    private String name;
    private ArrayList<Double> grades;

    /**
     * Constructor for Student with name 
     * and list of grades
     * @param name the name of the student
     * @param list the list of grades
     */
    public Student(String name, ArrayList<Double> list)
    {
        this.name = name;
        this.grades = list;
    }
    
    /**
     * Gets the name of the student
     * @return the student's name
     */
    public String getName()
    {
        return name;
    }
    
    /**
     * Gets the average of this student's grades
     * @return the average or 0 if there are no grades
     */
    public double getAverage()
    {
        double sum = 0;
        for ( double g : grades)
        {
            sum = sum + g;
        }
        
        double average = 0;
        if (grades.size() > 0)
        {
            average = sum / grades.size();
        }
        
        return average;
    }
    
    /**
     * @overrides
     */
    public String toString()
    {
        String s = "[Student:name=" + name 
           + ",grades=" + grades.toString() +"]";

        return s;
    }

}

Answer 1

Classroom.java

import java.util.ArrayList;

public class Classroom {

private ArrayList<Student> arl=null;

public Classroom() {

arl=new ArrayList<Student>();

}

public void add(Student s)

{

arl.add(s);

}

public String hasAverageGreaterThan(double target)

{

for(int i=0;i<arl.size();i++)

{

if(arl.get(i).getAverage()>target)

return arl.get(i).getName();

}

return "";

}

public ArrayList<String> getStudents()

{

ArrayList<String> studs=new ArrayList<String>();

for(int i=0;i<arl.size();i++)

{

studs.add(arl.get(i).getName());

}

return studs;

}

public Student bestStudent()

{

if(arl.size()==0)

return null;

else

{

double max=arl.get(0).getAverage();

int indx=0;

for(int i=0;i<arl.size();i++)

{

if(max<arl.get(i).getAverage())

{

max=arl.get(i).getAverage();

indx=i;

}

}

return arl.get(indx);

}

}

@Override

public String toString() {

return arl +"";

}

}

____________________

Student.java

import java.util.ArrayList;
/**
* Models a student with a name and collection
* pf grades
*/
public class Student
{
private String name;
private ArrayList<Double> grades;

/**
* Constructor for Student with name
* and list of grades
* @param name the name of the student
* @param list the list of grades
*/
public Student(String name, ArrayList<Double> list)
{
this.name = name;
this.grades = list;
}
  
/**
* Gets the name of the student
* @return the student's name
*/
public String getName()
{
return name;
}
  
/**
* Gets the average of this student's grades
* @return the average or 0 if there are no grades
*/
public double getAverage()
{
double sum = 0;
for ( double g : grades)
{
sum = sum + g;
}
  
double average = 0;
if (grades.size() > 0)
{
average = sum / grades.size();
}
  
return average;
}
  
/**
* @overrides
*/
public String toString()
{
String s = "[Student:name=" + name
+ ",grades=" + grades.toString() +"]";

return s;
}

}

___________________

ClassroomTester.java

import java.util.ArrayList;
/**
* Write a description of class UniversityTester here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class ClassroomTester
{
public static void main(String[] args)
{
ArrayList<Double> grades1 = new ArrayList<>();
grades1.add(82.0);
grades1.add(91.5);
grades1.add(85.0);
Student student1 = new Student("Srivani", grades1);
  
ArrayList<Double> grades2 = new ArrayList<>();
grades2.add(95.0);
grades2.add(87.0);
grades2.add(99.0);
grades2.add(100.0);
Student student2 = new Student("Carlos", grades2);

ArrayList<Double> grades3 = new ArrayList<>();
grades3.add(100.0);
grades3.add(98.0);
grades3.add(100.0);
grades3.add(97.0);
Student student3 = new Student("Maria", grades3);

ArrayList<Double> grades4 = new ArrayList<>();
grades4.add(80.0);
grades4.add(70.0);
grades4.add(82.0);
grades4.add(75.0);
Student student4 = new Student("Fred", grades4);

Classroom myClass = new Classroom();
myClass.add(student1);
myClass.add(student2);
myClass.add(student3);
myClass.add(student4);

System.out.println(myClass);
System.out.println("Expected: [[Student:name=Srivani,grades=[82.0, 91.5, 85.0]], [Student:name=Carlos,grades=[95.0, 87.0, 99.0, 100.0]], [Student:name=Maria,grades=[100.0, 98.0, 100.0, 97.0]], [Student:name=Fred,grades=[80.0, 70.0, 82.0, 75.0]]]");

System.out.println(">90 GPA: " + myClass.hasAverageGreaterThan(90.0));
System.out.println("Expected: Carlos");

System.out.println(">99 GPA: " + myClass.hasAverageGreaterThan(99));
System.out.println("Expected: ");

Student best = myClass.bestStudent();
if (best != null)
{
System.out.println(best.getName());
System.out.println("Expected: Maria");
}

System.out.println(myClass.getStudents());
System.out.println("Expected: [Srivani, Carlos, Maria, Fred]");

//test with an empty classroom
myClass = new Classroom();
System.out.println(myClass);
System.out.println("Expected: []");
System.out.println(">90 GPA: " + myClass.hasAverageGreaterThan(90.0));
System.out.println("Expected: ");

  
best = myClass.bestStudent();
if (best != null)
{
System.out.println(best.getName());
  
}

System.out.println(myClass.getStudents());
System.out.println("Expected: []");
  
}
}

____________________

Output:

[[Student:name=Srivani,grades=[82.0, 91.5, 85.0]], [Student:name=Carlos,grades=[95.0, 87.0, 99.0, 100.0]], [Student:name=Maria,grades=[100.0, 98.0, 100.0, 97.0]], [Student:name=Fred,grades=[80.0, 70.0, 82.0, 75.0]]]
Expected: [[Student:name=Srivani,grades=[82.0, 91.5, 85.0]], [Student:name=Carlos,grades=[95.0, 87.0, 99.0, 100.0]], [Student:name=Maria,grades=[100.0, 98.0, 100.0, 97.0]], [Student:name=Fred,grades=[80.0, 70.0, 82.0, 75.0]]]
>90 GPA: Carlos
Expected: Carlos
>99 GPA:
Expected:
Maria
Expected: Maria
[Srivani, Carlos, Maria, Fred]
Expected: [Srivani, Carlos, Maria, Fred]
[]
Expected: []
>90 GPA:
Expected:
[]
Expected: []

_______Could you plz rate me well.Thank You