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Add leading zeroes to number in Java? [duplicate]

Is there a better way of getting this result? This function fails if num has more digits than digits, and I feel like it should be in the library somewhere (like Integer.toString(x,"%3d") or something) ...
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When would you use a WeakHashMap or a WeakReference?

...use the latter one to "implement" the functionality of the first one: Set<ListenerType> listenerSet = Collections.newSetFromMap(new WeakHashMap<ListenerType, Boolean>()); With this listenerSet to register a new listener you just have to add it to the set, and even if it is not rem...
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Is there a way of making strings file-path safe in c#?

... One liner, for fun result = Path.GetInvalidFileNameChars().Aggregate(result, (current, c) => current.Replace(c, '-')); – Paul Knopf Mar 22 '13 at 3:44 ...
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Can't create handler inside thread that has not called Looper.prepare()

... UPDATE - 2016 The best alternative is to use RxAndroid (specific bindings for RxJava) for the P in MVP to take charge fo data. Start by returning Observable from your existing method. private Observable<PojoObject> getObservableItems() { ...
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Get individual query parameters from Uri [duplicate]

..."[?&](\w[\w.]*)=([^?&]+)"); public static IReadOnlyDictionary<string, string> ParseQueryString(this Uri uri) { var match = _regex.Match(uri.PathAndQuery); var paramaters = new Dictionary<string, string>(); while (match.Success) { ...
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Hex transparency in colors [duplicate]

...'m working on implementing a widget transparency option for my app widget although I'm having some trouble getting the hex color values right. Being completely new to hex color transparency I searched around a bit although I couldn't find a specific answer to my question. ...
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SSH library for Java [closed]

... long filesize = 0L; while (true) { if (in.read(buf, 0, 1) < 0) { // error break; } if (buf[0] == ' ') { break; } filesize = filesize * 10L + (long) (buf[0] - '0'); } String file = null; for (int i = 0...
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How to find first element of array matching a boolean condition in JavaScript?

I'm wondering if there's a known, built-in/elegant way to find the first element of a JS array matching a given condition. A C# equivalent would be List.Find . ...
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are there dictionaries in javascript like python?

...s completely valid both in Python and JavaScript – celticminstrel Oct 15 '15 at 22:45 If the value comes from the user...
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Pandas: Setting no. of max rows

...: pd.set_option('display.max_rows', 500) For older versions of pandas (<=0.11.0) you need to change both display.height and display.max_rows. pd.set_option('display.height', 500) pd.set_option('display.max_rows', 500) See also pd.describe_option('display'). You can set an option only tempo...