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java - How do servlets work? Instantiation, sessions, shared variables and multithreading

Suppose, I have a webserver which holds numerous servlets. For information passing among those servlets I am ... , what happens to the instance variables? Question&Answers:os...

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http - How do we control web page caching, across all browsers?

Our investigations have shown us that not all browsers respect the HTTP cache directives in a uniform manner. For ... the back button and view cached pages. Question&Answers:os...

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How can I merge properties of two JavaScript objects dynamically?

I need to be able to merge two (very simple) JavaScript objects at runtime. For example I'd like to: var ... to merge functions, just methods on flat objects. Question&Answers:os...

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algorithm - What is a plain English explanation of "Big O" notation?

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java - Android permission doesn't work even if I have declared it

I'm trying to write code to send an SMS from an Android app, but when I try to send the SMS it sends ... <uses-permission/> syntax, could you help me please? Question&Answers:os...

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php - How to Sort a Multi-dimensional Array by Value

How can I sort this array by the value of the "order" key? Even though the values are currently sequential, they will not ... [title] => Ready [order] => 1 ) ) Question&Answers:os...

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c++ - What is move semantics?

I just finished listening to the Software Engineering radio podcast interview with Scott Meyers regarding C++0x. Most ... move semantics... What is it exactly? Question&Answers:os...

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.net - What is the best algorithm for overriding GetHashCode?

In .NET, the GetHashCode method is used in a lot of places throughout the .NET base class libraries. ... custom classes so I don't degrade performance? Question&Answers:os...

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salt - How to use PHP's password_hash to hash and verify passwords

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Where can I find documentation on formatting a date in JavaScript?

I noticed that JavaScript's new Date() function is very smart in accepting dates in several formats. Xmas95 ... specifiers supported by the Date() object? Question&Answers:os...

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php - My PDO Statement doesn't work

This is my PHP sql statement and it's returning false while var dumping $password_md5 = md5($_GET['password']); ... ':password_plain' => $_GET['password'])); Question&Answers:os...

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SQL Server dynamic PIVOT query?

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Passing Parameters JavaFX FXML

How can I pass parameters to a secondary window in javafx? Is there a way to communicate with the corresponding ... passing the id as parameter). Any ideas? Question&Answers:os...

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jquery - How to use a variable for a key in a JavaScript object literal?

Why does the following work? <something>.stop().animate( { 'top' : 10 }, 10 ); Whereas this doesn't ... a CSS property to the animate function as a variable. Question&Answers:os...

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python - Flatten an irregular list of lists

Yes, I know this subject has been covered before (here, here, here, here), but as far as I know, all ... the best model? Did I overlook something? Any problems? Question&Answers:os...

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How do I make a redirect in PHP?

Is it possible to redirect a user to a different page through the use of PHP? Say the user goes to ... could even protect my pages from unauthorized users. Question&Answers:os...

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python - How to filter Pandas dataframe using 'in' and 'not in' like in SQL

How can I achieve the equivalents of SQL's IN and NOT IN? I have a list with the required values. Here's ... like a horrible kludge. Can anyone improve on it? Question&Answers:os...

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Can PHP PDO Statements accept the table or column name as parameter?

Why can't I pass the table name to a prepared PDO statement? $stmt = $dbh->prepare('SELECT * FROM :table WHERE 1 ... to do $sql = "SELECT * FROM $table WHERE 1" Question&Answers:os...

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javascript - What is the explicit promise construction antipattern and how do I avoid it?

I was writing code that does something that looks like: function getStuffDone(param) { | function getStuffDone(param ... and why is this called an antipattern? Question&Answers:os...

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javascript - What do querySelectorAll and getElementsBy* methods return?

Do getElementsByClassName (and similar functions like getElementsByTagName and querySelectorAll) work the same as getElementById or ... ).style.size = '100px'; Question&Answers:os...

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How do I extract data from JSON with PHP?

This is intended to be a general reference question and answer covering many of the never-ending "How do I ... this in PHP and access the resulting data? Question&Answers:os...

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How can I avoid Java code in JSP files, using JSP 2?

I'm new to Java EE and I know that something like the following three lines <%= x+1 %> <%= request. ... JSP 2 lines, and what is this technique called? Question&Answers:os...

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c++ - Undefined behavior and sequence points

What are "sequence points"? What is the relation between undefined behaviour and sequence points? I often use funny and ... by those who came up with the idea.) Question&Answers:os...

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r faq - How to make a great R reproducible example

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Movie analysis Xamarin , Android, iOS

I need a solution because I don't know how to start doing this. I need to create a short video ... :https://stackoverflow.com/questions/65829050/movie-analysis-xamarin-android-ios...

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How to check text file MIME type with typescript before upload?

Duplicate of How to check file MIME type with javascript before upload?. I just want to know can I on the same ... /how-to-check-text-file-mime-type-with-typescript-before-upload...

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javascript - After referring to document by querySelector I get an error in my React app - everything works fine until I scroll right to the bottom

I have a React app where I put a progress bar which changes its value once the user reaches some DOM elements. To ... -document-by-queryselector-i-get-an-error-in-my-react-app-ev...

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Google drive error while uploading the file from laravel

throw this error Google_Exception (list) unknown parameter: 'maxResults' // code $eod = new Eod; $eod->user_id ... 65829000/google-drive-error-while-uploading-the-file-from-laravel...

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