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1. 
a)
public class RandomStringChooser {
	private String[] wordArray;
	
	public RandomStringChooser(String[] words) {
		wordArray = words;
	}
	
	public String getNext() {
		if (wordArray.size()==0) {
			return "NONE";
		}
		int i = (Math.random()*wordArray.size()) - 1;
		result = wordArray[i];
		wordArray.remove(i);
		return result;
	}
}

b)
public RandomLetterChooser(String str) {
	String[] letterArray = getSingleLetters(str);
	if (letterArray.size()==0) {
			return "NONE";
		}	
	int i = (Math.random()*letterArray.size()) - 1;
		result = letterArray[i];
		letterArray.remove(i);
		return result;
}

2.
a)
machineId = message.substring(0, message.indexOf(":"));
description = message.substring(message.indexOf(":")+1);

b)
int i = description.indexOf("keyword");
if (i==-1) {
	return false;
}
if (!(i==0 || description.substring(i-1, i).equals(" ")) {
	return false;
}
else if (!(i==description.length()-keyword.length() || description.substring(i+keyword.length(), i+keyword.length()+1).equals(" "))) {
	return false;
}
return true;

c) 
List<LogMessage> list = messageList;
for (message : list) {
	description = message.getDescription();
	int i = 0;
	if (description.containsWord(keyword)) {
		list.remove(i);
	} else {
		i++;
	}
}
return list;

3.
a)
boolean result1 = false;
boolean result2 = false;
if (blackSquares[r][c]==false) {
	result1 = true;
}
if ((c==0 || puzzle[r-1][c]==0) || (r==0 || puzzle[r][c-1]==0)) {
	result2 = true;
}
return result1 && result2;

b)
int rows = blackSquares.size();
int columns = blackSquares[0].length;
puzzle = Square[rows][columns];
int num = 1;
for (int r=0; r<rows; r++) {
	for(int c=0;c<columns;c++) {
		if (toBeLabelled(r, c, blackSquares)) {
			Square sq = new Square(blacksquares[r][c], num);
			num++;
		} else {
			Square sq = new Square(blacksquares[r][c], 0);
		}
		puzzle[r][c] = sq;
	}
}

4.
a)
int total = 0;
for (word:wordList) {
	for (int i=0;i<word.length();i++) {
		num++;
	}
}
return num;

b)
int totalGapWidth = formattedLen-totalLetters(wordList);
return totalGapWidth/(wordList.size()-1);

c)
String result = "";
int numExtraSpaces = leftoverSpaces(wordList, formattedLen);
int spacesLeft = wordList.size()-1;
String space = "";
for (int i=0;i<basicGapWidth(wordList, formattedLen);i++) {
			space+=" ";
	}
for(word:wordList) {
	for (int i=0;i<word.length();i++) {
			result+=word[i];
	}
	if (numExtraSpaces>0) {
		result+=" ";	
	}
	if (spacesLeft>0) {
		result+=space;
	}
}
return result;