This is by far the hardest section in computer science I hav

This is by far the hardest section in computer science I have encountered because I still can\'t see the difference with arrays and arraylist or how to print them out properly without getting an error. How do I create an array verson of this section and what difference would it look like with an arrayList.

For each student

---Reads from a file the name and a series of labs for each person (students do not all have the same number of labs)

----Calculates the average of the labs

----Stores the name and average in an array of class Grades.

Prints the information from the array using a “for loop”

Prints the following information with appropriate documentation:

----Class lab average

----Name and average of student with highest average

----Name and average of student with lowest average

Searches for particular students

----Asks the user for a name

----If the name is in the array, prints the name and average for that person.

----If the name is not in the array, prints a message to the user indicating the name does not exist.

----Continues to ask the user for names until the user wants to stop

You must use one, and only one, array for this application. do NOT use multiple arrays.

Create a new program but you must use one, and only one, arrayList for this application.

Solution

import java.util.*;
import java.io.*;
public class Driver{

          Grades grades[]=new Grades[10];
          int size=-1;
    public void read()
    {
        BufferedReader br = null;
       try {
           String sCurrentLine;
           br = new BufferedReader(new FileReader(\"grades.txt\"));
           while ((sCurrentLine = br.readLine()) != null) {
                boolean found=false;
               String token[]=sCurrentLine.split(\",\");
               for(int i=0;i<size;i++)
               {
                    if(grades[i].getName().equals(token[0]))
                    {
                        found=true;
                        grades[i].setGrade((grades[i].getGrade()+Integer.parseInt(token[1]))/2);
                    }
               }
               if(!found)
               {
                    size++;
                    grades[size]=new Grades(token[0],Integer.parseInt(token[1]));
               }

           }
       } catch (IOException e) {
           e.printStackTrace();
       }
    }
  
    public double calAvg()
    {
        double avg=0;
        for(int i=0;i<=size;i++)
        {
            avg+=grades[i].getGrade();
        }
        avg/=grades.length;
        return avg;
    }
  
    public void display()
    {
        for(int i=0;i<=size;i++)
        {
           System.out.println(grades[i]);
        }
    }
  
    public double getMax()
    {
         double max=-99;
        for(int i=0;i<=size;i++)
        {
            if(grades[i].getGrade()>max)
            max=grades[i].getGrade();
        }
        return max;
    }
  
    public double getMin()
    {
         double min=999;
        for(int i=0;i<=size;i++)
        {
            if(grades[i].getGrade()<min)
            min=grades[i].getGrade();
        }
        return min;
    }
  
    public void search(String n)
    {
        boolean found=false;
        for(int i=0;i<=size;i++)
        {
            if(grades[i].getName().equals(n))
            {
                found=true;
                System.out.println(\"Student found!!!\");
                System.out.println(\"Average of Labs: \"+grades[i].getGrade());
            }
        }
      
        if(!found)
        System.out.println(\"Student not found!!\");
    }

     public static void main(String []args){
                Scanner read=new Scanner(System.in);
         Driver driver=new Driver();
         driver.read();
         driver.display();
         System.out.println(\"Average of labs: \"+driver.calAvg());
         System.out.println(\"Max of average labs: \"+driver.getMax());
         System.out.println(\"Min of average labs: \"+driver.getMin());
         boolean flag=true;
         do
         {
             System.out.print(\"\ Enter name of student: \");
             String search=read.next();
             driver.search(search);
         }while(flag);
        System.out.println(\"Hello World\");
     }
}

class Grades
{
    String name;
    double grade;
    Grades(String n,double l)
    {
        name=n;
        grade=l;
    }
    public String toString()
    {
        return \"\ Name: \"+name+\"\\tGrade: \"+grade;
    }
    public String getName()
    {
        return name;
    }
    public double getGrade()
    {
        return grade;
    }
    public void setGrade(double g)
    {
        grade=g;
    }
}

Post another question for arraylist implementation