Modify the StudentRecordManager class provided for Unit 1 project to take advantage of composition design.For grading purposes, use the StudentRecordManager.java file provided to you, not the one with your own work. Do not fill in #ADD portions.

You still need other provided files for this project i.e. Student class and the data folder.

After modification, the StudentRecordManager class should look like this (red means private):

• recListis a private instance data member now;
• The constructor should just initializerecListwithloadFromFile()result;
• displayRecords()is a public instance method (not private, not static) now and doesn't take any parameters as the data it needs is in instance data memberrecList;
• size()should just report # of records as now users of this class don't have access to the arraylist.
• Do not touchloadFromFile().
• Put thismain()directly inStudentRecordManagerclass. This project should compile and work the same as before (the given project portion in Unit 1).Include a screenshot of your program outputin assignment report.

 public static void main(String[] args)  {  // path and file name of data file  String fileName = "data/cs219.txt";  StudentRecordManager roster = new StudentRecordManager(fileName);  roster.displayRecords(); // display data in table format  // simple statistics  System.out.println("Number of students: " + roster.size()); } // end main 

// Student.java (complete)

// CS219 HW1 Project

// represents a student record

//

// Author: CS219

public class Student

{

// instance data members

private String name;

private int absenceCount = 0;

// constructor

public Student(String name, int absenceCount)

{

this.name = name;

this.absenceCount = absenceCount;

}

// accessors

public String getName() { return name; }

public int getAbsenceCount() { return absenceCount; }

} // end class Student

// StudentRecordManager.java (incomplete)

// CS219 HW1 Project

// (Entry point of the project. Need to use with Student class)

//

// Manages student records using an ArrayList of Student.

// - Load student record data from file in constructor

// - display raw records and some statistics

// java.io classes, used for file i/o

import java.io.File;

import java.io.IOException;

import java.util.Scanner; // I/O methods

import java.util.ArrayList;

public class StudentRecordManager

{

public static void main(String[] args)

{

ArrayList recList = null;

// path and file name of data file

String fileName = "data/cs219.txt";

// This "cs219.txt" file should already exist in a folder named "data".

// If using an IDE and source code file is put in a default "src" folder, folder "data" should be at the same location as the "src" folder;

// otherwise, "data" folder should be at the same location as your .java file

recList = loadFromFile(fileName);

displayRecords(recList);

System.out.println("Number of students: " + recList.size());

//if (recList.size() > 0)

//System.out.printf("Avg AbsenceCount: %.1f%n", avgAbsenceCount(recList));

} // end main

// display student records on screen

private static void displayRecords(ArrayList records)

{

if (records == null || records.size() == 0) // null or empty

{

System.out.println("Empty class. No data to show");

return; // exit method now

}

// has some records

System.out.println("-----------------------------------");

// ADD #1

// END ADD #1

System.out.println("-----------------------------------");

} // end displayRecords

// calculate and return average absence count of all students

// ADD #2

// END ADD #2

// load student data from text files

/**

* Fills student record ArrayList with data from text file.

* columns are separated with comma ,

*

* @param fileNamename of input text file

* @returnnumber of records loaded

* @throws IOException: any exception during file opening, reading, and closing

*/

private static ArrayList loadFromFile(String fileName)

{

Scanner fileIn = null;// scanner object to connect to file

ArrayList records = new ArrayList<>(); // initialize to empty list

try

{

// open input file

fileIn = new Scanner(new File(fileName));

// skip first line (headings row)

fileIn.nextLine(); // read one line, but do not use

// loop to read multiple records

while (fileIn.hasNext()) // more lines to read?

{

// 1. read one line containing all columns of a record

String line = fileIn.nextLine();

if (line.isEmpty())// empty line: go read next line

continue;

// 2. extract name (1st column) and absence count (2nd column)

// 1st col is name, 2nd col is absence count: xxxx, dd

String name;

int absenceCount;

int toIndex = line.indexOf(',');// locate first comma ,

name = line.substring(0, toIndex); // from beginning to the char right before first comma ,

String absenceCountStr = line.substring(toIndex+1);// +1 to skip comma ,

absenceCount = Integer.parseInt(absenceCountStr.trim()); // trim() leading/trailing whitespace

// 3. create Student object and add to ArrayList records

records.add(new Student(name, absenceCount));

// end one record

}// end while: reading all records

}

catch (IOException ioe)

{

System.out.println("Error reading \"" + fileName + "\" file: " + ioe);

}

finally // close file

{

if ( fileIn != null)

{// close if was connected to a file

fileIn.close();

}

}

// end file input

return records;

}// end loadFromFile

} // end class StudentRecordManager