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The following is what I consider an extension of @OldCurmudgeon's ansswer with three significant deviations/diclaimers: It's uses Java 8's Stream and Predicate. It turns your Response class into an …

Short (and hopefully sweet) advice: Are you able to modify parse() to throw a ParseException (I assuming you're talking about the linked one) if its argument is null? Something like: String parse(Ob …

Your log output shouldn't also be detailing the code that failed, because the JVM is going to generate a more detailed stacktrace, and you should print that instead. LOGGER.error("..." + url, e); I …

Printing or writing .gitignore files? Your title says printing, your description says writing, and your code seem to indicate you are merely creating a Map of directory, which has a .gitignore file, …

public static double userInput(String userInput){ // ... if(userInput.matches("-?\\d+(\\.\\d+)?")){ // ... } else { System.err.println("ERROR: Non numeric input.Please chec …

Defaulting to properties inside the Builder You should perform validation inside the times(int), sleep(int) and on(Predicate) to either warn callers of invalid values, if not to throw an Exception. E …

Maps (copying my answer from another question): A HashMap or ConcurrentHashMap (if you require the thread-safety) is preferred over the legacy Hashtable, as mentioned in the Javadoc: As of the J …

Java 8 Optional<Box> maybe = boxDao.retrieve(boxIds.get(0)); if (maybe.isPresent()) { return maybe.get(); } // C logger.warn("box not found"); throw new BoxNotFoundException(); If this is the …

DAOFactory public abstract class DAOFactory { // List of DAO types supported by the factory public static final int POSTGRESQL = 1; public static final int ORACLE = 2; ... } Woah, …