create a total & amount variable (for the average... average = total/amount)
double total =0;
double amount=0;
 
//for each line in the file
while ((line = input.readLine()) != null)
{
 
	//tokenize the line
	StringTokenizer tokenizer = new StringTokenizer(line, ",");
 
	//if there are 3 tokens in the line
	if( tokenizer.countTokens() == 3)
	{
		//get 1st token in line
		String str = tokenizer.nextToken();
 
		//get 2nd token in line
		int num1 = Integer.parseInt(tokenizer.nextToken().trim());
 
		//get 3rd token in line
		int num2 = Integer.parseInt(tokenizer.nextToken().trim());
 
		//add numbers to total
		total += num1 + num2;
 
		//increment amount
		amount++;
 
	}
 
}
 
//show average
System.out.println("Average is: " + total/amount);

import java.util.*;
//subject class
class Subject
{
	//name of subject
	private String name;
 
	//all the assignments in the subject
	private ArrayList assignments = new ArrayList();
 
	//constructor
	public Subject(String name)
	{
		this.name = name;
	}
 
	//add an assignment to subject
	public void addAssignment(Assignment assign)
	{
		assignments.add(assign);
	}
 
	//get an assignment from subject
	public Assignment getAssignment(String name)
	{
		for(int i =0; i < assignments.size(); i++)
		{
			Assignment assign = (Assignment)( assignments.get(i) );
 
			if(assign.getName().equals(name))
			{
				return assign;	
			}
		}
 
		throw new RuntimeException("Assignment " + name + " not found");
	}
 
}
 
//assignment
class Assignment
{
	//data
	private String name;
	private int maxScore;
	private int maxScaledScore;
 
	//constructor
	public Assignment(String name, int maxScore, int maxScaledScore)
	{
		this.name = name;
		this.maxScore = maxScore;
		this.maxScaledScore = maxScaledScore;
 
	}
 
	//get max score
	public int getMaxScore()
	{
		return maxScore;	
	}
 
	//get scaled max score
	public int getMaxScaledScore()
	{
		return maxScaledScore;	
	}
 
	//get name
	public String getName()
	{
		return name;	
	}
 
	//toString()
	public String toString()
	{
		return "The info is... Name: " + name + " Max Score: " + maxScore + " Scaled Max Score: " + maxScaledScore; 
	}
}
 
class Main
{
	public static void main(String[] args)
	{
		//create hashmap from name to Subject objects
		HashMap subjects = new HashMap();
 
 
 
 
		//create subject object
		Subject sub1 = new Subject("Intro to Something");
 
			//add assignments to object
			Assignment a11 = new Assignment("Assignment 1", 100, 15);
			sub1.addAssignment(a11);
 
			//add assignments to object
			Assignment a12 = new Assignment("Assignment 2", 100, 70);
			sub1.addAssignment(a12);
 
			//add assignments to object
			Assignment a13 = new Assignment("Assignment 3", 80, 20);
			sub1.addAssignment(a13);
 
		//add to hashmap
		subjects.put("Intro to Something", sub1);
 
 
 
 
 
		//create subject object
		Subject sub2 = new Subject("Intro to Typing");
 
			//add assignments to object
			Assignment a21 = new Assignment("Assignment 1", 67, 15);
			sub2.addAssignment(a21);
 
			//add assignments to object
			Assignment a22 = new Assignment("Assignment 2", 77, 15);
			sub2.addAssignment(a22);
 
			//add assignments to object
			Assignment a23 = new Assignment("Assignment 3", 72, 45);
			sub2.addAssignment(a23);
 
		//add to hashmap
		subjects.put("Intro to Typing", sub2);
 
 
 
 
		//get subject "Intro to Typing"
		Subject aSubjectWeWant = (Subject)( subjects.get("Intro to Typing"));
 
		//get assignment 2 from the subject object
		Assignment assignWeWant = (Assignment) ( aSubjectWeWant.getAssignment("Assignment 2") );
 
		//print out its max score
		System.out.println( "Max score of assignment 2 of subject 'Intro to Typing' is: " + assignWeWant.getMaxScore() );
 
	}
}

import java.io.*;
import java.util.*;
 
public class Assign1
{
	public static void main(String [] args)
	{
		BufferedReader input;
		String line;
		Description [] subject;
		int i = 0;
		int lineCount = 0;
 
		try
		{
			FileReader fr = new FileReader("Description.txt");
			input = new BufferedReader(fr);
 
			while ((line = input.readLine()) != null)
			{
				lineCount++;
			}
 
			System.out.println(lineCount);
			subject = new Description[lineCount - 1];
 
			while ((line = input.readLine()) != null)
			{
				StringTokenizer tokenizer = new StringTokenizer(line, ", \t");
				String token1, token2, token3;
 
				while (tokenizer.hasMoreTokens())
				{
					token1 = tokenizer.nextToken();
					token2 = tokenizer.nextToken();
					token3 = tokenizer.nextToken();
					subject[i] = new Description(token1, token2, token3);
					i++;
				}
			}
 
			input.close();
		}
 
		catch (IOException e)
		{
			System.err.println(e);
		}		
	}
}
 
class Description
{
	//variables
	private String name;
	private String maxScore;
	private String maxScaledScore;
 
	//constructor
	public Description(String name, String maxScore, String maxScaledScore)
	{
		this.name = name;
		this.maxScore = maxScore;
		this.maxScaledScore = maxScaledScore;
 
	}
 
	//get scaled max score
	public String getMaxScaledScore()
	{
		return maxScaledScore;	
	}
 
	//get max score
	public String getMaxScore()
	{
		return maxScore;	
	}
 
	//get name
	public String getName()
	{
		return name;	
	}
 
	//toString()
	public String toString()
	{
		return "The info is... Name: " + name + " Max Score: " + maxScore + " Scaled Max Score: " + maxScaledScore; 
	}
}