Added some comments

src/main/java/mattrixwv/ProjectEuler/Driver.java

@@ -26,9 +26,11 @@ import java.util.Scanner;
 
 
 public class Driver{
+	//An enum to hold the possible menu selections
 	private static enum SELECTIONS{SOLVE, DESCRIPTION, LIST, BENCHMARK, EXIT, SIZE};
 	private static final Scanner input = new Scanner(System.in);
 
+	//Drives the program
 	public static void main(String[] args){
 		SELECTIONS selection = SELECTIONS.SIZE;	//Holds the menu selection of the user
 		do{
@@ -47,6 +49,7 @@ public class Driver{
 			}
 		}while(!selection.equals(SELECTIONS.EXIT));
 	}
+	//Print the menu
 	private static void printMenu(){
 		System.out.println("1. Solve a problem");
 		System.out.println("2. Print a problem description");
@@ -55,6 +58,7 @@ public class Driver{
 		System.out.println("5. Exit");
 		System.out.println();
 	}
+	//Get a menu selection from the user
 	private static SELECTIONS getMenuSelection(){
 		Integer selection = input.nextInt();
 		while(!isValidMenu(selection)){
@@ -64,6 +68,7 @@ public class Driver{
 		}
 		return getSelection(selection);
 	}
+	//Make sure the value passed in is a valid menu option
 	private static Boolean isValidMenu(Integer selection){
 		//Ordinal + 1 because enum starts at 0
 		if((selection > 0) && (selection < (SELECTIONS.SIZE.ordinal() + 1))){
@@ -73,6 +78,7 @@ public class Driver{
 			return false;
 		}
 	}
+	//Turns an integer passed to it into a SELECTION enum
 	private static SELECTIONS getSelection(Integer selection){
 		SELECTIONS sel = null;
 
@@ -86,9 +92,11 @@ public class Driver{
 		}
 		return sel;
 	}
+	//Print an error message
 	private static void printErrorMessage(){
 		System.out.println("That is an invalid selection!");
 	}
+	//Handle what happens when a user wants to solve a problem
 	private static void solveMenu(){
 		Integer problemNumber = ProblemSelection.getProblemNumber();
 		//This selection solves all problems in order
@@ -106,6 +114,7 @@ public class Driver{
 			ProblemSelection.solveProblem(problemNumber);
 		}
 	}
+	//Handle what happens when a user wants to see the description of a problem
 	private static void descriptionMenu(){
 		//Give some extra space to print the description
 		System.out.println("\n");

src/main/java/mattrixwv/ProjectEuler/ProblemSelection.java

@@ -31,11 +31,13 @@ import mattrixwv.ProjectEuler.Problems.*;
 
 public class ProblemSelection{
 	private static final Scanner input = new Scanner(System.in);
+	//Holds the valid problem numbers
 	public static final ArrayList<Integer> PROBLEM_NUMBERS = new ArrayList<Integer>(Arrays.asList( 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10,
 																									  11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
 																									  21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
 																									  31, 67));
 
+	//Returns the problem corresponding to the given problem number
 	public static Problem getProblem(Integer problemNumber){
 		Problem problem = null;
 		switch(problemNumber){
@@ -74,12 +76,14 @@ public class ProblemSelection{
 		}
 		return problem;
 	}
+	//Print the description of a problem
 	public static void printDescription(Integer problemNumber){
 		//Get the problem
 		Problem problem = getProblem(problemNumber);
 		//Print the problem's description
 		System.out.println(problem.getDescription());
 	}
+	//Solve a problem
 	public static void solveProblem(Integer problemNumber){
 		//Get the problem
 		Problem problem = getProblem(problemNumber);
@@ -90,6 +94,7 @@ public class ProblemSelection{
 		//Print the results
 		System.out.println(problem.getResult() + "\nIt took " + problem.getTime() + " to solve this problem.\n\n");
 	}
+	//Get a valid problem number from a user
 	public static Integer getProblemNumber(){
 		Integer problemNumber = 0;
 		System.out.print("Enter a problem number: ");
@@ -100,6 +105,7 @@ public class ProblemSelection{
 		}
 		return problemNumber;
 	}
+	//List all valid problem numbers
 	public static void listProblems(){
 		System.out.print(PROBLEM_NUMBERS.get(1));
 		for(Integer problemNumber = 2;problemNumber < PROBLEM_NUMBERS.size();++problemNumber){