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Question about the task

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"The getStudentWithHighestAverageGrade() method should return the student who has the highest average grade among the list of students." "The getStudentWithLowestAverageGrade() method should return the student with the lowest average grade." (University class)

6.1. Replace a parameter with a set of specialized methods. Replace the Student class's setValue() method
with specialized setCourse() and setAverageGrade() methods.
6.2. Add a parameter. Add a double parameter to the getStudentWithAverageGrade() method so the average grade of the required student is clear.
Implement the getStudentWithAverageGrade() method.
6.3. Remove a parameter. Remove the parameter from the getStudentWithHighestAverageGrade() method.
Implement this method. It should return the student with the highest average grade.
6.4. Separate a query from a modification. Split the getStudentWithLowestAverageGradeAndExpel() method into Student getStudentWithLowestAverageGrade() and void expel(Student student). The first method should return the student with the lowest average score, and the second method should expel the passed student (remove it from the students list).

Requirements:

Replace the Student class's setValue() method with specialized setCourse() and setAverageGrade() methods.
You need to add a double parameter to the University class's getStudentWithAverageGrade() method and implement the method.
You need to remove the parameter from the University class's getStudentWithHighestAverageGrade(double) method and implement the method.
You need to split the getStudentWithLowestAverageGradeAndExpel() method into Student getStudentWithLowestAverageGrade() and void expel(Student student), and implement these two methods.

package com.codegym.task.task29.task2909.car; import java.util.Date; public class Car { static public final int TRUCK = 0; static public final int SEDAN = 1; static public final int CABRIOLET = 2; double fuel; public double summerFuelConsumption; public double winterFuelConsumption; public double winterWarmingUp; private int type; private boolean driverAvailable; private int numberOfPassengers; public Car(int type, int numberOfPassengers) { this.type = type; this.numberOfPassengers = numberOfPassengers; } public int fill(double numberOfGallons) { if (numberOfGallons < 0) return -1; fuel += numberOfGallons; return 0; } public double getTripConsumption(Date date, int length, Date summerStart, Date summerEnd) { double consumption; if (date.before(summerStart) || date.after(summerEnd)) { consumption = length * winterFuelConsumption + winterWarmingUp; } else { consumption = length * summerFuelConsumption; } return consumption; } public int getNumberOfPassengersThatCanBeCarried() { if (!isDriverAvailable()) return 0; if (fuel <= 0) return 0; return numberOfPassengers; } public boolean isDriverAvailable() { return driverAvailable; } public void setDriverAvailable(boolean driverAvailable) { this.driverAvailable = driverAvailable; } public void startMoving() { if (numberOfPassengers > 0) { fastenPassengerBelts(); fastenDriverBelt(); } else { fastenDriverBelt(); } } public void fastenPassengerBelts() { } public void fastenDriverBelt() { } public int getMaxSpeed() { if (type == TRUCK) return 80; if (type == SEDAN) return 120; return 90; } }

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Darek

Level 41 , Katowice, Poland

23 September 2020, 15:53

In the public method Student getStudentWithHighestAverageGrade () 1. Create an auxiliary variable, e.g. maxAverageGrade for which download the grade average from the list for the first student double maxAverageGrade = students.get (0) .getAverageGrade (); 2. In the foreach loop for all students, check which sudent has the highest grade point average for (Student student: students) { if (maxAverageGrade <student.getAverageGrade ()) { maxAverageGrade = student.getAverageGrade (); } } 3. In the second foreach loop, check which student has previously taken the highest average and return this student for (Student student: students) { if (student.getAverageGrade () == maxAverageGrade) { return student; } } return null; In the public method Student getStudentWithLowestAverageGrade () do the same as in the getStudentWithHighestAverageGrade () method, only now we are looking for the lowest grade average The only difference: if (minAverageGrade> student.getAverageGrade ()) { minAverageGrade = student.getAverageGrade (); } However, in the void expel method (Student student) You have to delete the student passed in the method parameter from the list of students: students.remove (student);