class

问题 In Xamarin, I am wanting to store data and global variables using the Application object. I looked at this resource for this code: http://www.helloandroid.com/tutorials/maintaining-global-application-state Here is my code: public class HelloApplication : Application { private int GlobalVariable = 1; public int GetGlobalVariable() { return GlobalVariable; } public void SetGlobalVariable(int GlobalVariable) { this.GlobalVariable = GlobalVariable; } } I am trying to reference the class using

问题 Is there a way to convert string or characters to class member/member functions to access them dynamically? for ex. this particular code, #include <iostream> #include <map> using namespace std; class agnt { public: int x, y; agnt(int a=0, int b=0) : x(a), y(b) {} }; int main() { map<int,agnt> agntID; agnt temp; temp.x=1; temp.y=5; agntID[1]=temp; for(char tmp='x'; tmp<'z'; tmp++) { cout<<agntID[1].tmp<<'\n'; //Here I get the following error: tmp is } //not a member of class agnt } Is there a

问题 I am currently facing an interesting problem where our application fails to start up on 3/4 nodes due to classloading issues. The problem seems to be that WAS is loading b.jar before a.jar. After troubleshooting more, I found that all of the nodes load the jars in different orders (via Classpath viewer in console) and the working node may have just been a fluke. How does WebSphere determine the classloading order within an installed applications WEB-INF/lib folder? 回答1: Order of loading jars

问题 I'm trying to create a base class with a number of abstract python properties, in python 3.7. I tried it one way (see 'start' below) using the @property, @abstractmethod, @property.setter annotations. This worked but it doesn't raise an exception if the subclass doesn't implement a setter. That's the point of using @abstract to me, so that's no good. So I tried doing it another way (see 'end' below) using two @abstractmethod methods and a 'property()', which is not abstract itself but uses

问题 I have this method (in my own classloader) that loads classes from zip: ZipInputStream in = new ZipInputStream(new FileInputStream(zip)); ZipEntry entry; while ((entry = in.getNextEntry()) != null) { if (!entry.isDirectory()) { byte[] buffer = new byte[(int) entry.getSize()]; in.read(buffer); if (!entry.getName().endsWith(".class")) continue; String name = entry.getName().replace(".class", "").replace("/", "."); Class<?> cls = this.defineClass(name, buffer, 0, buffer.length); this

问题 Is there a way to add stylesheets to the header after including the header file? Say we have this code: class content { public $stylesheets = array(); public function addStylesheets($stylesheets) { if(!empty($stylesheets)) { if(!is_array($stylesheets)) $stylesheets = array($stylesheets); $this->stylesheets = array_merge($this->stylesheets, $stylesheets); } } public function getStylesheets() { $response = ''; foreach($this->stylesheets as $stylesheet) $response .= '<link rel="stylesheet" type=

问题 I have this kind of structure: class Foo: def __init__(self, val1): self.val1 = val1 def changeToGoo(self) HOW??? class Goo(Foo): def __init__(self, val1, val2): super(val1) self.val2 = val2 a = Foo(1) a.changeToGoo() 'a' is now an instance of Foo now i would like to change it to be an instance of Goo, by using the method "changeToGoo", and add the other value. How can this be done in Python? I have tried: self.__class__ = Goo but when I check: type(a) it's still Foo, and not Goo. 回答1: In

问题 I have two static volatile variables defined in my class ADC . The class is written as: (cropped to save space) #pragma once #include "../PeriodicProcess/PeriodicProcess.h" #include <stdint.h> #include <stdlib.h> class ADC { private: static inline unsigned char SPI_transfer(unsigned char data); void read(uint32_t tnow); static const unsigned char adc_cmd[9]; static volatile uint32_t _sum[8]; static volatile uint16_t _count[8]; public: ADC(); void raw(); void init(PeriodicProcess * scheduler);

问题 A super-class Car and a sub-class Jaguar was created. The function info() -> Void in the sub-class overrided the super-class' function. A instance named theAuto of type Jaguar had been created. Problem: Seems I cannot up casts the theAuto to the type of Car , please see the code snippet and its comments class Car { func info() { print("You've got a car") } } class Jaguar : Car { override func info() { print("You've got a Jaguar") } } let theAuto = Jaguar() theAuto.info() // --> You've got a

问题 I have a Java class "Listings". I use this in my Java MapReduce job as below: public void map(Object key, Text value, Context context) throws IOException, InterruptedException { Listings le = new Listings(value.toString()); ... } I want to run the same job on Spark. So, I am writing this in Scala now. I imported the Java class: import src.main.java.lists.Listings I want to create a Listings object in Scala. I am doing this: val file_le = sc.textFile("file// Path to file") Listings lists = new