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java - Does the JVM prevent tail call optimizations?

I saw this quote on the question: What is a good functional language on which to build a web service ... about the JVM that creates this fundamental limitation? Question&Answers:os...

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android - SimpleCursorTreeAdapter and CursorLoader for ExpandableListView

I am trying to asynchronously query a provider by using a CursorLoader with a SimpleCursorTreeAdapter Here is my ... approach. Does anyone have any suggestions? Question&Answers:os...

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python - ImportError after successful pip installation

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swift - Trying to Understand Asynchronous Operation Subclass

I am trying to get started with using Operations in a side project rather than having closure-based callbacks ... me understand why these methods are declared. Question&Answers:os...

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typescript - I get "Http failure response for (unknown url): 0 Unknown Error" instead of actual error message in Angular

I'm using Angular 4 HttpClient to send requests to external service. It is a very standard setup: this. ... ? Here's a screenshot demonstrating the problem: Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to mock private method for testing using PowerMock?

I have a class which I would like to test with a public method that calls private one. I'd like to assume ... It can be done? Did anybody have this problem? Question&Answers:os...

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java - How does a for loop work, specifically for(;;)?

Looking through some old company code, I came across a for loop that looks like this: for (;;) { //Some ... in a programming class or is this an unusual loop? Question&Answers:os...

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excel - Wait for shell command to complete

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - tellg() function give wrong size of file?

I did a sample project to read a file into a buffer. When I use the tellg() function it gives me a larger value than ... +) cout << buffer[i]; cout << endl; } Question&Answers:os...

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c# - How can I create a dynamic button click event on a dynamic button?

I am creating one button on a page dynamically. Now I want to use the button click event on that button. How can I do this in C# ASP.NET? Question&Answers:os...

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c++ - bool to int conversion

How portable is this conversion. Can I be sure that both assertions pass? int x = 4<5; assert(x==1); x = 4>5; ... t ask why. I know that it is ugly. Thank you. Question&Answers:os...

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c# - The cast to value type 'Int32' failed because the materialized value is null

I have the following code. I'm getting error: "The cast to value type 'Int32' failed because the materialized ... can I modify the query to accept null values? Question&Answers:os...

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c# - JavaScriptSerializer.Deserialize - how to change field names

Summary: How do I map a field name in JSON data to a field name of a .Net object when using ... in JavaScriptSerializer? Can it be done at all? Question&Answers:os...

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python - How to kill a while loop with a keystroke?

I am reading serial data and writing to a csv file using a while loop. I want the user to be able to ... to continue to run after the while loop is terminated. Question&Answers:os...

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javascript - Chrome Uncaught Syntax Error: Unexpected Token ILLEGAL

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What's the difference between jQuery .live() and .on()

I see there's a new method .on() in jQuery 1.7 that replaces the .live() in earlier versions. I'm ... and what the benefits are of using this new method. Question&Answers:os...

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In Java, how do I parse XML as a String instead of a file?

I have the following code: DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(xmlFile); How can I get it to ... within a String instead of a file? Question&Answers:os...

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functional programming - Can you explain closures (as they relate to Python)?

I've been reading a lot about closures and I think I understand them, but without clouding the picture for myself ... where and why I would want to use them. Question&Answers:os...

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php - Show values from a MySQL database table inside a HTML table on a webpage

I want to retrieve the values from a database table and show them in a html table in a page. I already searched ... And then all the other values below 'john'. Question&Answers:os...

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android - Implementations of Emoji (Emoticon) View/Keyboard Layouts

I am trying to figure out how the emoji (emoticon) selections are implemented on the Facebook app and the Google ... ); messageInput.getText().append("u1F601"); Question&Answers:os...

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c++ - Why must the copy assignment operator return a reference/const reference?

In C++, the concept of returning reference from the copy assignment operator is unclear to me. Why can't the copy ... } param = a.param; return *this; } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Swift - How to convert String to Double

I'm trying to write a BMI program in swift language. And I got this problem: how to convert a String to a ... ; But how can I achieve this in Swift language? Question&Answers:os...

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android - launch sms application with an intent

I have a question about an intent... I try to launch the sms app... Intent intent = new Intent(Intent.ACTION_MAIN); ... don't know how I can do... Thank's Question&Answers:os...

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Base64 decode snippet in C++

Is there a freely available Base64 decoding code snippet in C++? Question&Answers:os...

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How does variable assignment work in JavaScript?

So I was playing around the other day just to see exactly how mass assignment works in JavaScript. First I tried this example ... a; a = 'bar'; console.log(b); Question&Answers:os...

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java - Creating multiple log files of different content with log4j

Is there a way to configure log4j so that it outputs different levels of logging to different appenders? I'm trying to ... there a way to get what I'm after? Question&Answers:os...

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javascript - React Native fetch() Network Request Failed

When I create a brand new project using react-native init (RN version 0.29.1) and put a fetch in the render method ... ((error) => { console.error(error); }); Question&Answers:os...

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How to convert currentTimeMillis to a date in Java?

I have milliseconds in certain log file generated in server, I also know the locale from where the log file was ... ,992 jodaTime 2011-11-22 21:25:52,992 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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