Generating random words in Java?

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抹茶落季
抹茶落季 2021-02-14 09:47

I wrote up a program that can sort words and determine any anagrams. I want to generate an array of random strings so that I can test my method\'s runtime.

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  • 2021-02-14 10:23

    Why generating random words? When you can use some dictionaries.

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  • 2021-02-14 10:23

    If you want random words without using a dictionary...

    1. Make a list of all the letters you want possible in your words
    2. Generate a random index to pick out a letter from the list
    3. Repeat until you have your desired word length

    Repeat these steps for the number of words you want to generate.

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  • 2021-02-14 10:30

    RandomStringUtils from commons-lang

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  • 2021-02-14 10:32

    You can call this method for each word you want to generate. Note that the probability of generating anagrams should be relatively low though.

    String generateRandomWord(int wordLength) {
        Random r = new Random(); // Intialize a Random Number Generator with SysTime as the seed
        StringBuilder sb = new StringBuilder(wordLength);
        for(int i = 0; i < wordLength; i++) { // For each letter in the word
            char tmp = 'a' + r.nextInt('z' - 'a'); // Generate a letter between a and z
            sb.append(tmp); // Add it to the String
        }
        return sb.toString();
    }
    
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  • 2021-02-14 10:33

    If you want to generate random words of a given length, you'll either need an algorithm to determine if a given string is a word (hard), or access to a word list of all the words in a given language (easy). If it helps, here's a list of every word in the Scrabble dictionary.

    Once you have a list of all words in a language, you can load those words into an ArrayList or other linear structure. You can then generate a random index into that list to get the random word.

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  • 2021-02-14 10:44

    Do you need actual English words, or just random strings that only contain letters a-z?

    If you need actual English words, the only way to do it is to use a dictionary, and select words from it at random.

    If you don't need English words, then something like this will do:

    public static String[] generateRandomWords(int numberOfWords)
    {
        String[] randomStrings = new String[numberOfWords];
        Random random = new Random();
        for(int i = 0; i < numberOfWords; i++)
        {
            char[] word = new char[random.nextInt(8)+3]; // words of length 3 through 10. (1 and 2 letter words are boring.)
            for(int j = 0; j < word.length; j++)
            {
                word[j] = (char)('a' + random.nextInt(26));
            }
            randomStrings[i] = new String(word);
        }
        return randomStrings;
    }
    
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