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问题 I'm mostly a c/C++/objective-C programmer, presently working in Java on an android application. My question is simple: I want a utility function, preferably not associated with any class that I can invoke from anywhere in my project (#include of some sort necessary?). I know I can make a public static function of a class and invoke it as Class.someFunction(); . I would like to just have someFunction(); I'm not sure if this is possible in java, or what the syntax for it is. 回答1: You can

问题 Fragment A The problem here is whenever I call passitem() , passqty() , passamt() , passtot() i get the value which is declared at the time of intialization.i.e, int totalp = 0; String itemp = "", qtyp = "", amtp = "" .I want the variable itemp=item; , qtyp=qty; , amtp=amt; , totalp=total; i.e,local variable data.Please help me out I'm extremly thankful to YOU all. Also P.S:-when I try to get data itemp , qtyp .etc in onActivityCreated i'm getting it perfectly. public class Fragment_nonveg

问题 I need to create a connection pool to database which can be reused by requests in Flask. The documentation( 0.11.x ) suggests to use g , the application context to store the database connections. The issue is application context is created and destroyed before and after each request. Thus, there is no limit on the number of connection being created and no connection is getting reused. The code I am using is: def get_some_connection(): if not hasattr(g, 'some_connection'): logger.info(

问题 I created a Java application that uses GlobalScreen to addNativeKeyListener . (jnativehook library) When i press F5 it executes a code. Problem is that if i give focus to other applications it also executes funciton for the focused application. (for example Chrome will refreshes website) Is there a way to suppress these functions and give my application full control over F5? I use this to listen for F5 keyPress globaly (even if my application loses focus): public class Listen implements

问题 There are a few Python dependencies that I would like to be available in every venv (virtual environment) that I create for each project. For example black, flake8 and pytest. Is that possible and if so, how to achieve that? I'd like to install these three once under my main Python installation, instead I have to reinstall all of them in every venv that I create when I start a new project. This is specially annoying when using VSCode which throws popups complaining about "Linter flake8 is not

问题 There are a few Python dependencies that I would like to be available in every venv (virtual environment) that I create for each project. For example black, flake8 and pytest. Is that possible and if so, how to achieve that? I'd like to install these three once under my main Python installation, instead I have to reinstall all of them in every venv that I create when I start a new project. This is specially annoying when using VSCode which throws popups complaining about "Linter flake8 is not

问题 I am fairly new to Python and Numpy, and I encountered this issue when translating a MATLAB program into Python. As far as I can tell, the code below is behaving abnormally by modifying a global variable even though it shouldn't. import numpy as np A = np.matrix([[0, 1, 2], [3, 4, 5], [6, 7, 8]]) def function(B): B[1,1] = B[1,1] / 2 return B C = function(A) print(A) The output is: [[0 1 2] [3 2 5] [6 7 8]] The function divides the middle number of the matrix by two and returns it. But it

问题 Is this allowed? Class A{ ... ... }; A a; //Global object int main() { A a; // Local object . . . . return 0; } Here a global object has been declared after the class definition, but also a local variable has been declared. Is it ok? Why? 回答1: It's perfectly legal to "hide" the declaration of an object, with another declaration in tighter scope. Within your main function, a will refer to the local variable. Outside the main function, a will refer to the global variable. As to whether it's "ok

问题 Is this allowed? Class A{ ... ... }; A a; //Global object int main() { A a; // Local object . . . . return 0; } Here a global object has been declared after the class definition, but also a local variable has been declared. Is it ok? Why? 回答1: It's perfectly legal to "hide" the declaration of an object, with another declaration in tighter scope. Within your main function, a will refer to the local variable. Outside the main function, a will refer to the global variable. As to whether it's "ok

问题 On my project, we have a header file that looks akin to this: typedef struct MyStruct { int x; } MyStruct; extern "C" MyStruct my_struct; Previously, it was only included in C++ source files. Now, I have need to include it in C files. So, I do the following: typedef struct MyStruct { int x; } MyStruct; #ifdef __cplusplus extern "C" MyStruct my_struct; #else MyStruct my_struct; #endif I understand that extern "C" will declare the my_struct global variable to be of C-linkage, but does this then