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java - Class file has wrong version 52.0, should be 50.0

I'm trying to compile my project in IntelliJ idea. I'm using a class in an external jar file and ... (Apart from Java development experience) See Question&Answers more detail:os...

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

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java - printf %f with only 2 numbers after the decimal point?

In my printf, I need to use %f but I'm not sure how to truncate to 2 decimal places: Example: getting 3.14159 to print as: 3.14 See Question&Answers more detail:os...

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

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672 views

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intellij idea - Can't update Android Studio - only download

I have not updated my Android Studio for a while and am presented with this dialog box when trying to update: ... I have been able to before? See Question&Answers more detail:os...

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

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java - Jackson @JsonProperty(required=true) doesn't throw an exception

I am using jackson 2.2 annotation @JsonProperty with required set to true. While deserializing json file which ... exception will be thrown. See Question&Answers more detail:os...

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

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java - Why does dividing a float by an integer return 0.0?

So if I have a range of numbers '0 - 1024' and I want to bring them into '0 - 255', the maths would dictate ... and int. all to no avail. WHY!? See Question&Answers more detail:os...

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

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java - Why does SimpleDateFormat parse incorrect date?

I have date in string format and I want to parse that into util date. var date ="03/11/2013" I am parsing ... Mon May 27 00:00:00 IST 201309 See Question&Answers more detail:os...

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

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android - Is proguard.cfg needed for library projects?

Assuming I need to apply the same rules for both an application project and a library project on which it ... each of the library projects? See Question&Answers more detail:os...

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

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Python regex string matching?

I'm having a hell of a time trying to transfer my experience with javascript regex to Python. I'm just ... than the python site offers? See Question&Answers more detail:os...

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

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c++ - Try to understand compiler error message: default member initializer required before the end of its enclosing class

I try next code with three compilers (msvc2017, gcc8.2, clang7.0) and msvc2017 works all the way, but gcc ... compiler bug? Thanks in advance. See Question&Answers more detail:os...

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

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java - How do I populate a JComboBox with an ArrayList?

I need to populate a JComboBox with an ArrayList. Is there any way to do this? See Question&Answers more detail:os...

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

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c - warning: return type defaults to ‘int’ [-Wreturn-type]

I'm a Linux user who started learning C and I'm trying to compile this source that I typed: #include < ... want to understand what this means See Question&Answers more detail:os...

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

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c# - BinaryWriter Endian issue

I am using BinaryWriter class to write a binary file to disk. When I invoke the Write method, passing an unsigned ... make it write big endian? See Question&Answers more detail:os...

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

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php - Merging two multidimensional arrays on specific key

Let's say I have following arrays: Array ( [0] => Array ( [id] => 5 [name] => Education ) [1] ... I achieve this? Any help is much appreciated. See Question&Answers more detail:os...

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

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c# - Interaction between WebBrowser Control and Windows Forms

I am managing various contact information - phone, address, email, IM, other and I want it to look ... generated plenty of html dynamically. See Question&Answers more detail:os...

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

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rust - How do I use floating point number literals when using generic types?

Regular float literals do not work: extern crate num_traits; use num_traits::float::Float; fn scale_float<T: Float>(x ... ` found type `{float}` See Question&Answers more detail:os...

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

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java - Spring AOP not working, when the method is called internally within a bean

I have several Aspects coded in my application. All others works except for the following. Service Interface package ... wrong. Please help me. See Question&Answers more detail:os...

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

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224 views

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Create a reset of javascript Array prototype when Array.prototype has been modified?

General question: When a default Javascript prototype like Array has been modified, hacked, changed and twisted to the ... [] : new normalArray; See Question&Answers more detail:os...

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

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python - Calling a hook function every time an Exception is raised

Let's say I want to be able to log to file every time any exception is raised, anywhere in my program. I don ... __name__ == '__main__': main(); See Question&Answers more detail:os...

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

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c - Disable variable-length automatic arrays in gcc

I couldn't disable it even though by using -std=c89 flag. How can I disable it? See Question&Answers more detail:os...

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

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r - Subsetting a data frame based on contents of another data frame

I have two data.frames. For examples sake let's say they look like this: df1 <- data.frame(x=rep( ... need equally sized data.frames. Thoughts? See Question&Answers more detail:os...

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

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225 views

1 answer

c++ - How do we explain the result of the expression (++x)+(++x)+(++x)?

x = 1; std::cout << ((++x)+(++x)+(++x)); I expect the output to be 11, but it's actually 12. Why? See Question&Answers more detail:os...

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

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sorting - Re-ordering bars in R's barplot()

What I want to achieve is exactly the same that was already asked here (and specifically using R's base ... but ordered according to data$cat? See Question&Answers more detail:os...

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

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279 views

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javascript - Increment a number in a string in with regex

I get the name of an input element, which is a string with a number (url1). I want to increment the number ... }); } list.appendChild(liNew); See Question&Answers more detail:os...

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

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go - How to collect values from N goroutines executed in a specific order?

Below is a struct of type Stuff. It has three ints. A Number, its Double and its Power. Let's pretend that ... / powers belong to what numbers. See Question&Answers more detail:os...

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

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541 views

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python - Can't drop NAN with dropna in pandas

I import pandas as pd and run the code below and get the following result Code: traindataset = pd.read_csv('/ ... ? I am craaaazy right now. See Question&Answers more detail:os...

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

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363 views

1 answer

java - Detecting client disconnect in tomcat servlet?

How can I detect that the client side of a tomcat servlet request has disconnected? I've read that I ... IOException if the client disconnects? See Question&Answers more detail:os...

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

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680 views

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winapi - Applying low-level keyboard hooks with Python and SetWindowsHookExA

So I'm trying to figure out how to register a global keyboard hook using Python. From what I have ... pythoncom.PumpMessages() kb.end_capture() See Question&Answers more detail:os...

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

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411 views

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Connect to Wifi in Android Q programmatically

I had this function to connect in Wifi network, below Android 10 it works fine, but when I tried on ... (networkRequest,networkCallback); } } See Question&Answers more detail:os...

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

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