JAVA programming help

I need help making a class diagram for the 4 classes in my program below

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public class Driver

{

public static void main(String[] args)

{

Student arrStudent[] = new Student[40];

int studentCount=0;

arrStudent = Util.readFile("C:\\Users\\JamesJr\\OneDrive\\Documents\\School\\CURRENT QUARTER\\Winter 2018\\Java 35A\\Assignments\\Assignment 5\\StudentScores.txt", arrStudent);

// find number of lines from file. which will show number of students in array.

studentCount= Util.studentCount;

Statistics s = new Statistics();

// print student data fetched from file

for(int i = 0; i

{

arrStudent[i].printData();

}

// print statistics of students

s.printStatistics(arrStudent,studentCount);

}

}

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import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.StringTokenizer;

public class Util

{

static int studentCount;

static Student[] readFile(String filename, Student[] stu)

{

int i = 0;

try

{

FileReader file = new FileReader(filename);

BufferedReader buff = new BufferedReader(file);

boolean eof = false;

boolean firstLineSkipped = false;

while (!eof)

{

String line = buff.readLine();

if (line == null)

{

eof = true;

}

else

{

if (!firstLineSkipped)

{

firstLineSkipped = true;

continue;

}

stu[i] = new Student();

StringTokenizer st = new StringTokenizer(line);

while (st.hasMoreTokens())

{

stu[i].setSID(Integer.parseInt(st.nextToken()));

int[] arr = new int[5];

for (int j = 0; j < 5; j++)

{

arr[j] = Integer.parseInt(st.nextToken());

}

stu[i].setScores(arr);

}

}

i++;

}

buff.close();

}

catch (IOException e)

{

System.out.printf("Error -- " + e.toString());

}

studentCount = i-1;

return stu;

}

}

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public class Statistics

{

private int[] lowscores= new int[5];

private int[] highscores= new int[5];

private float[] avgscores= new float[5];

void findlow(Student[] a, int c)

{

// finds low score.

int i=0;

for(i=0;i<5; i++)

{

int[] temp= a[0].getScores();

int min = temp[i];

for(int j=0; j< c; j++)

{

int[] s= a[j].getScores();

if(min > s[i])

{

min = s[i];

}

}

lowscores[i]= min;

}

}

//find high score

void findhigh(Student[] a, int c)

{

int i=0;

for(i=0;i<5; i++)

{

int[] temp= a[0].getScores();

int max = temp[i];

for(int j=0; j< c; j++)

{

int[] s= a[j].getScores();

if(max < s[i])

{

max = s[i];

}

}

highscores[i]= max;

}

}

//find average score.

void findavg(Student[] a, int c)

{

int i=0;

for(i=0;i<5; i++)

{

int sum =0;

for(int j=0; j

{

int[] s= a[j].getScores();

sum= sum + s[i];

}

avgscores[i]= sum/c;

}

}

//print statistics for all students and all quizes

public void printStatistics(Student[] a, int c)

{

findlow(a,c);

findhigh(a,c);

findavg(a,c);

System.out.printf("\t\t\tLowest score :\t" + lowscores[0] + "\t" + lowscores[1] + "\t" + lowscores[2] + "\t" + lowscores[3] + "\t" + lowscores[4] + " ");

System.out.printf("\t\t\tHigh score :\t" + highscores[0] + "\t" + highscores[1] + "\t" + highscores[2] + "\t" + highscores[3] + "\t" + highscores[4] + " ");

System.out.printf("\t\t\tAverage score :\t" + avgscores[0] + "\t" + avgscores[1] + "\t" + avgscores[2] + "\t" + avgscores[3] + "\t" + avgscores[4] + " ");

}

}

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public class Student

{

private int SID;

private int scores[] = new int[5];

//get and set functions for scores and ID

public int getSID()

{

return this.SID;

}

public void setSID(int id)

{

this.SID= id;

}

public int[] getScores()

{

return this.scores;

}

public void setScores(int[] s)

{

this.scores= s;

}

//print all data of a student

public void printData()

{

System.out.printf("\t\t\t\t"+ SID +"\t"+ scores[0] +"\t"+ scores[1] +"\t"+ scores[2] + "\t"+ scores[3] +"\t"+ scores[4] +" ");

}

}