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问题 This question already has answers here : Casting to a Class which is determined at run-time (2 answers) Closed 6 years ago . I'm trying to use custom Class as a value in a Map<String, Class<?>> . Following are relevant parts of code: Following is declaration and initialization of Map in main() : public static Map<String, Class<?>> mapQuery2ResponseType = new HashMap<String, Class<?>>(); static { mapQuery2ResponseType.put("string1", CustomClass1.class); mapQuery2ResponseType.put("string2",

问题 I don't get what I'm doing wrong. It's a really simple program I made to practice using headers, classes and constructors. It says that I'm not missing a return type for the function getValue() in Header2.cpp. I have no idea how to fix it. Any ideas? Test.cpp #include <iostream> #include <conio.h> #include "Header2.h" int main() { Thing Implement(1); std::cout << "The truth value is: " << Implement.getValue() << std::flush << "/n"; _getch(); return 0; } Header2.h #ifndef Object_H_ #define

问题 I have following code for controller Qprs <?php defined('BASEPATH') OR exit('No direct script access allowed'); class Qprs extends CI_Controller { public function xyz() { //some code } } below code used to call above controller from another controller $this->load->library('../controllers/Qprs'); $this->Qprs->xyz(); but getting error: Unable to locate the specified class Qprs.php How to solve such error? 回答1: Very simple way in codeigniter to call a method of one controller to other controller

问题 I'm having an issue here with my WHERE LIKE statement. Ideally, I want to be able to search for multiple terms (or just 1 or the other). Right now, for testing purposes, I have this separated in my test form where I choose what type of function I'm running. Purpose : Please ignore the update function for the moment (I'm sure it's a mess like the rest but I haven't finished up there yet). Still trying to finish the dFind() function. The purpose of this testing is so that I can build a data

问题 I'm having an issue here with my WHERE LIKE statement. Ideally, I want to be able to search for multiple terms (or just 1 or the other). Right now, for testing purposes, I have this separated in my test form where I choose what type of function I'm running. Purpose : Please ignore the update function for the moment (I'm sure it's a mess like the rest but I haven't finished up there yet). Still trying to finish the dFind() function. The purpose of this testing is so that I can build a data

问题 public static void main(String args[]) throws IOException { Process p = Runtime.getRuntime().exec("java E:/workspace/JNIProgram/src/JNIProgram.class"); } so I have this code and am trying to run the JNIProgram.class file however the program gets terminated instantly without doing its job (which is to create a new txt file and write to it) So what am I doing wrong 回答1: The java command expects a Java class name , not a filename. So the command java E:/workspace/JNIProgram/src/JNIProgram.class

问题 public static void main(String args[]) throws IOException { Process p = Runtime.getRuntime().exec("java E:/workspace/JNIProgram/src/JNIProgram.class"); } so I have this code and am trying to run the JNIProgram.class file however the program gets terminated instantly without doing its job (which is to create a new txt file and write to it) So what am I doing wrong 回答1: The java command expects a Java class name , not a filename. So the command java E:/workspace/JNIProgram/src/JNIProgram.class

问题 I've got a abstract baseclass, this is used for deriving some classes. Some properties of these classes are shared among all classes, and these should be unmodifiable. To make a variable shared among all 10 classes I'll make it static. class ABC{ public: static int *anArray; int index; static int tot_index; virtual void print()=0; ABC(){index=tot_index++;}; virtual ~ABC(){}; }; This works fine, tot_index will contain the number of classes instantiated, and the index is the unique indentifier

问题 I've created a custom class which conforms to NSCopying and NSMutableCopying . I've added an implementation for -copyWithZone: and -mutableCopyWithZone: , but whenever I call -mutableCopy on my object and try to call another method, it crashes because some of the ivars have become immutable, even though I call -mutableCopyWithZone: on the ivars. Here's how I'm copying my class: MyObject *flipped = [list mutableCopy]; [MyObject flip:flipped]; (the code fails on +flip: , because it tries to use

问题 I am trying to accept user input and then pass that input to another class in order to perform a series of checks. In this case, to compare the answer to a list of options that a user can type and if they type an option an action will be performed. I am starting with a menu option but I type 'menu' in the console, nothing happens...the program just terminates without an error. In debugging, at the 'return;' the value 'menu' is stored in the variable 'answer'. The very next step after that I