methods

问题 I'm fresh to C# - just started a day ago. I have to do a simple C# database consisting of music albums etc. The problem I got is that I can't call a method i just did, can anyone help me to include this method in main? void addnew() { int ID = currid; string AlbNm; string Art; string RelDstring; int RelD; string TrAmnstring; int TrAmn; string Loc; int Rat; int ratswitch; string ratswitchstring; Console.Clear(); Console.WriteLine("Podaj nazwe albumu"); AlbNm = Console.ReadLine(); Console

问题 I want add a method "toFormatString(fmt)" to the existed class java.util.Date. My code is below: Date.metaClass.toFormatString(String fmt) = { SimpleDateFormat sdf = new SimpleDateFormat(fmt) return sdf.format(delegate) } However, Intellij gives me an error: Invalid value to assign to. 回答1: It should be: import java.text.SimpleDateFormat Date.metaClass.toFormatString = { String fmt -> SimpleDateFormat sdf = new SimpleDateFormat(fmt) return sdf.format(delegate) } assert new Date()

问题 I have the following class called A , with the method getValue() : public class A { public final int getValue() { return 3; } } The method getValue() always returns 3 , then i have another class called B , i need to implement something to access to the method getValue() in the class A , but i need to return 4 instead 3 . Class B : public class B { public static A getValueA() { return new A(); } } The main class ATest : import org.junit.Test; import static org.junit.Assert.assertEquals; import

问题 I have several raw sound files that I want to play using the MediaPlayer class in the android API, before I change the data source to a different file do I have to call release(); The documentation says that the release(); method will end the MediaPlayer object, I am using the same MediaPlayer object to switch between the different raw files so will that interfere, or do I just call release after the program ends 回答1: Call reset() first. It resets the MediaPlayer to its uninitialized state.

问题 I have an Interface, that has some methods interface IFunction { public double y(double x); public double yDerivative(double x); } and I've got static classes, that are implementing it. static class TemplateFunction:IFunction { public static double y(double x) { return 0; } public static double yDerivative(double x) { return 0; } } I want to pass this classes as a parameter to another function. AnotherClass.callSomeFunction(TemplateFunction); And some other class that catches the request

问题 Presume that there are methodA() , methodB() and methodC(). And methodC() is called at the run-time. Is is possible to know methodC() is called from what method? I was thinking if CallStack can be read at the run-time for some checks? If yes, I think it should not be a big deal. Any ideas? Thanks! 回答1: Use the StackTrace and StackFrame classes. For example: StackTrace stackTrace = new StackTrace(); StackFrame[] stackFrames = stackTrace.GetFrames(); foreach (StackFrame stackFrame in

问题 The numThrows Variable is inciting an error of variable not found when used in the main method. even though i declare it in one of the methods. I use the declare the variable in the void prompt method. This program is designed to calculate Pi using random coordinates then uses a formula to estimate pie over a user given amount of tries. import java.util.Random; import java.util.Scanner; import java.io.PrintWriter; import java.io.File; import java.io.IOException; public class Darts public

问题 I am trying to find a word with the most vowels in a sentence inputted by the user. Right now when I call this method it works fine with a shorter sentence. But when it gets over 7 words it doesn't print out the word with the most vowels. I can't seem to spot the error =( I thank you guys in advance! private static void getWordMostVowel(String sentence) { String word = ""; String wordMostVowel = ""; int temp = 0; int vowelCount = 0; char ch; for(int i = 0; i < sentence.length(); i++){ ch =

问题 I am trying to update a user, but when I hit the submit button, Laravel throws the below error: "RouteCollection->methodNotAllowed(array('GET', 'HEAD', 'POST')) in RouteCollection.php line 206". I think that the PUT method is not allowed, but I do not understand the reason. The request never reaches UserController@update . I have configured a resource route like this: Route::resource('backend/users', 'Backend\UsersController'); The output of php artisan route:list is: 回答1: I solved the

问题 I know that it's possible to do method swizzling for Selectors and Methods in Objective C. Is it possible to swizzle functions like NSLog to our custom function. I wanted to add some extra functionality along with NSLog in the custom function. EDIT: I finally ended up using another function which will call NSLog internally. #define NSLog(...) CustomLogger(__VA_ARGS__); void CustomLogger(NSString *format, ...) { va_list argumentList; va_start(argumentList, format); NSMutableString * message =