String Operations - solution

import java.util.Random;

public class StringOperations
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        // test compare appendFirstLetter method
        String[] words = { "Hi", "Ellwood", "Loves", "Likeable", "Objects" };
        String theNewWord = appendFirstLetter(words);
        System.out
                .println("The word created from the supplied array of words is: "
                        + theNewWord);

        // test append Strings method
        theNewWord = appendStrings(words);
        System.out
                .println("The big word created from sticking the words in the word array together is: "
                        + theNewWord);

        // test get words with S method
        /*
        String[] endsWithSTest = { "The", "animals", "ran", "over", "objects",
                "created", "by", "the masses" };
        */
        int amtWords = 1000;
        int wordLength = 30;
        String letter = "z";
        String[] endsWithSTest = {};
        endsWithSTest = new String[amtWords];
        for (int i = 0; i < amtWords; i++)
        {
            String word = generateGibberishString(wordLength);
            endsWithSTest[i] = word;
        }

        words = getWordsThatEndWithLetter(endsWithSTest, letter);
        for (int i = 0; i < words.length; i++)
        {
            System.out.println(words[i]);
        }
        System.out.println("Amount of gibberish words of length " + wordLength
                + " that end with " + letter + " is: "
                + getAmtWordsThatEndWithLetter(endsWithSTest, "s"));

    }

    public static String[] getWordsThatEndWithLetter(String[] words,
            String letter)
    {
        String l = letter;
        String res = "";
        System.out.println("The words that end with " + letter + " are: ");
        for (int i = 0; i < words.length; i++)
        {
            if (words[i].endsWith(l))
            {
                res = res.concat(words[i] + ":");
            }

        }
        String delims = "[:]";
        // set up String array to hold splitted input elements
        String[] wordsThatEndWithLetter = res.split(delims);

        return wordsThatEndWithLetter;
    }

    public static int getAmtWordsThatEndWithLetter(String[] words, String letter)
    {
        String l = letter;
        String res = "";
        int counter = 0;
        for (int i = 0; i < words.length; i++)
        {
            if (words[i].endsWith(l))
            {
                res = res.concat(words[i] + ":");
                counter++;
            }

        }
        return counter;
    }

    public static String appendStrings(String[] words)
    {
        String newWord = new String();
        for (int i = 0; i < words.length; i++)
        {
            newWord = newWord.concat(words[i]);
        }
        return newWord;
    }

    public static String appendFirstLetter(String[] words)
    {
        String newWord = new String();
        // Loop to iterate through our Array
        for (int i = 0; i < words.length; i++)
        {
            newWord = newWord.concat(Character.toString(words[i].charAt(0)));
        }
        return newWord;
    }

    public static String generateGibberishString(int wordLength)
    {
        String[] letters = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
                "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
                "w", "x", "y", "z", };
        int wl = wordLength;
        String randLetter = "";
        String randWord = "";
        Random gen = new Random();
        for (int i = 0; i < wl; i++)
        {
            randLetter = letters[gen.nextInt(26)];
            randWord = randWord.concat(randLetter);
        }
        return randWord;
    }
}