code-dumps/java/RandomPassword/PasswordGenerator.java

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;

class PasswordGenerator {
    private static final int DEFAULT_PASSWORD_LENGTH = 3;

    public static void main(String[] args) {
        try {
            List<String> dictionary = loadDictionary(args[0]);
            String password = generatePassword(dictionary, DEFAULT_PASSWORD_LENGTH);
            System.out.println(password.replaceAll("o", "0"));
        } catch (IOException e) {
            System.err.println("Failed to load dictionary file: " + e.getMessage());
        }
    }

    private static List<String> loadDictionary(String filename) throws IOException {
        List<String> dictionary = new ArrayList<>();
        try (BufferedReader br = new BufferedReader(new FileReader(filename))) {
            String line;
            while ((line = br.readLine()) != null) {
                dictionary.add(line.trim());
            }
        }
        return dictionary;
    }

    private static String generatePassword(List<String> dictionary, int length) {
        StringBuilder passwordBuilder = new StringBuilder();
        SecureRandom random;
        try {
            random = SecureRandom.getInstanceStrong();
        } catch (NoSuchAlgorithmException e) {
            random = new SecureRandom();
        }
        for (int i = 0; i < length; i++) {
            int randomIndex = random.nextInt(dictionary.size());
            String word = dictionary.get(randomIndex);
            passwordBuilder.append(toCamelCase(word));
	    if ( i < length-1) {
	    	passwordBuilder.append("+");
	    }
        }
        return passwordBuilder.toString();
    }

    private static String toCamelCase(String inputString) {
	return inputString.substring(0,1).toUpperCase() + inputString.substring(1).toLowerCase();
    }
}