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why are java constants declared static?

Why are java constants declared static ? class Foo{ static final int FII = 2 ; } In this I understand the ... , and not an instance variable? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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why does python timeit give this error: NameError: name 'w1' is not defined

I have an assignment where i have to create a couple of functions and then use the timeit module to see which one is ... 'w1' is not defined Does anyone know how to fix this?...

asked Oct 24, 2021 in Technique[技术] by yukiE (120 points)

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why is javascript node.js not on google app engine

Google created the V8 JavaScript engine: V8 compiles JavaScript source code directly into machine code when it is ... not doing just that? See Question&Answers more detail:os...

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

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why opencv imshow() create a new window has the same name as namedWindow() does in Debug Mode?

I want to create a mat and show it in a window named "figure". If there is nothing wrong, there should be a window ... , m); cv::waitKey(0); } See Question&Answers more detail:os...

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

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why is TypeScript converting string literal union type to string when assigning in object literal?

I love string literal union types in TypeScript. I came across a simple case where I was expecting the union type to ... . I am OK with that. See Question&Answers more detail:os...

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

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why we need to override equals and hashcode in java and why cannot we use Object class implementation

guys please let me know, in real world why we need to override equals and hashcode and cant we use Object's equals and hashcode. See Question&Answers more detail:os...

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

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why in an 'if' statement 'then' has to be in the next line in bash?

if is followed by then in bash but I don't understand why then cannot be used in the same line like if [...] ... ] then echo "$1 is positive" fi See Question&Answers more detail:os...

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

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why does python.subprocess hang after proc.communicate()?

I've got an interactive program called my_own_exe. First, it prints out alive, then you input S and then it prints ... idea why it's like 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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why numpy.ndarray is object is not callable in my simple for python loop

I loaded a text file containing a two column matrix (e.g. below) [ 1 3 2 4 3 5 2 0] My calculation ... can I do this simple calculation? Thanks. See Question&Answers more detail:os...

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

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why does filter have to be defined for pattern matching in a for loop in scala?

To create a new class that can be used in a Scala for comprehension, it seems that all you have to do is ... into that needs the filter method? See Question&Answers more detail:os...

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

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why spring-boot application doesn't require @EnableWebMvc

So i wrote a small application, In order to get familiar with basics i made it as simple as possible. I made a ... is it not throwing an error ? See Question&Answers more detail:os...

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

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why are there two different kinds of for loops in java?

I have a for loop, and I am not sure how it works. I am familiar with: for(int i = 0; i <= 9 ... do they do differently then regular for loops? See Question&Answers more detail:os...

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

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why java.exe exit with value 1 in android studio

Error:Execution failed for task ':app:dexDebug'. com.android.ide.common.process.ProcessException: org.gradle.process. ... non-zero exit value 1 See Question&Answers more detail:os...

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

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why can't I get the right sum of 1D array with numba (cuda python)?

I try to use cuda python with numba. The code is to calculate the sum of a 1D array as follows, but I don' ... do it. Can someone give advice ? See Question&Answers more detail:os...

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

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why can't python unzip a password protected zip file created by winrar using the zip method?

I have searched the web high and low but still couldn't find a solution for the above problem. Does ... argument (got str instance instead) See Question&Answers more detail:os...

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

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why lazy loaded module has to import commonModule? Angular 2

When we import BrowserModule in root module of application ,we can use NgIf and NgFor( in eagerly loaded component ... in lazy loaded module? See Question&Answers more detail:os...

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

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why implicit conversion is harmful in C++

I understand that the keyword explicit can be used to prevent implicit conversion. For example Foo { public: ... implicit conversion is harmful? See Question&Answers more detail:os...

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

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why is metal shader gradient lighter as a SCNProgram applied to a SceneKit Node than it is as a MTKView?

I have a gradient, generated by a Metal fragment shader that I've applied to a SCNNode defined by a ... rootNode.addChildNode(geometryNode) } } See Question&Answers more detail:os...

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

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why wamp server put online/ offline option is missing?

I'm using windows 8. recently i've installed wampserver3_x86_apache2.4.17_mysql5.7.9_php5.6.15. but the put online/ ... this option. What to do? See Question&Answers more detail:os...

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

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why is simple javascript code not running?

why is simple javascript code not running ? <script type="text/javascript" charset="utf-8"> var btn = document. ... "#">click me </a> See Question&Answers more detail:os...

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

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why the size of array as a constant variable is not allowed in C but allowed in C++?

I tried to write a c program as below? const int x = 5; int main() { int arr[x] = {1, 2, 3, 4, ... array size, why x is not treated as constant? See Question&Answers more detail:os...

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

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why reference size is always 4 bytes - c++

On a 32-bit machine I always get the sizeof of a reference 4 bytes even if it's a reference to a double, so ... ; // this will print out 4 } See Question&Answers more detail:os...

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

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why is data structure alignment important for performance?

Can someone give me a short and plausible explanation for why the compiler adds padding to data structures in ... byte aligned in Windows? See Question&Answers more detail:os...

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

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