interface

问题 can anyone tell me if I am right or wrong? I am really getting confused in solving my problem. What I have is (or what I want to do Or am thinking is:) I have: Class B{ ........ ........ interface I{ ...... ........ } ....... ....... } and : Class A implements B.I{ ........ ....... B b= new B(); } Is it the right way of communication between two classes class B and Class A? how should i make this work. I want some data from class A passed to class B for further operations. how should i make

问题 I have created the following checkbox popup in Python 3.5 using tkinter (see image) with the following code: from tkinter import * class Checkbar(Frame): def __init__(self, parent=None, picks=[], side=LEFT, anchor=W): Frame.__init__(self, parent) self.vars = [] for pick in picks: var = IntVar() chk = Checkbutton(self, text=pick, variable=var) chk.pack(side=side, anchor=anchor, expand=YES) self.vars.append(var) def state(self): return map((lambda var: var.get()), self.vars) if __name__ == '_

问题 I'm trying to write a program that would use 7-Zip DLL for reading files from inside archive files (7z, zip etc). Here's where I'm so far: #include <QtCore/QCoreApplication> #include <QLibrary> #include <QUuid> #include <iostream> using namespace std; #include "7z910/CPP/7zip/Archive/IArchive.h" #include "7z910/CPP/7zip/IStream.h" #include "MyCom.h" // {23170F69-40C1-278A-1000-000110070000} QUuid CLSID_CFormat7z(0x23170F69, 0x40C1, 0x278A, 0x10, 0x00, 0x00, 0x01, 0x10, 0x07, 0x00, 0x00);

问题 I'm trying to invoke a method via reflection. The method in question, let's say public void someMethod(someInterface<someObject> arg1) I do not have access to someMethod and someInterface at runtime, and have to invoke by someclass.getMethod("someMethod", new Class[]{Class.forName("someInterface")}) .invoke(...) But it fails with a ClassNotFound exception for someInterface . How do I get the Class object for interfaces? 回答1: I believe that you forgot the interface's package. You have to use

问题 I have a around 50 databases that have 150 tables each and working on a search mechanism that would allow to query the tables that have specific columns. Most database structures are same so idea is to generate EF entities and put interfaces behind the entities generated if tables that they are being generated from have specific columns, so that I could later query then on that column. Model will likely be constantly changing so I can't manually add interfaces on tables - here come in T4

问题 I have been scratching my head over this for days and I still cannot understand how to implement this interface. Here is my code: namespace ConsoleApplication32 { public static class ScanAndSerialize { public static void Serialize() { List<string> dirs = FileHelper.GetFilesRecursive("s:\\"); List<string> dirFiles = new List<string>(); foreach (string p in dirs) { string path = p; string lastAccessTime = File.GetLastAccessTime(path).ToString(); bool DirFile = File.Exists(path); DateTime

问题 Java 8 introduces default methods to provide the ability to extend interfaces without the need to modify existing implementations. I wonder if it's possible to explicitly invoke the default implementation of a method when that method has been overridden or is not available because of conflicting default implementations in different interfaces. interface A { default void foo() { System.out.println("A.foo"); } } class B implements A { @Override public void foo() { System.out.println("B.foo"); }

问题 im updating a project from sf2.6(php5.6) to sf3.4(php7.1)... its going well but now im stuck with an error i cant figure out how to fix it error output: PHP message: PHP Fatal error: Uncaught Symfony\\Component\\Debug\\Exception\\FatalThrowableError: Type error: Argument 2 passed to Sonata\\FormatterBundle\\Formatter\\Pool::add() must implement interface Sonata\\FormatterBundle\\Formatter\\FormatterInterface, boolean given, called in /var/www/var/cache/dev/ContainerMklcxqq

问题 im updating a project from sf2.6(php5.6) to sf3.4(php7.1)... its going well but now im stuck with an error i cant figure out how to fix it error output: PHP message: PHP Fatal error: Uncaught Symfony\\Component\\Debug\\Exception\\FatalThrowableError: Type error: Argument 2 passed to Sonata\\FormatterBundle\\Formatter\\Pool::add() must implement interface Sonata\\FormatterBundle\\Formatter\\FormatterInterface, boolean given, called in /var/www/var/cache/dev/ContainerMklcxqq

问题 valid code: interface Int1{ String str = "123"; } class Pparent{ String str = "123"; } class F extends Pparent implements Int1{ } invalid code add main method to F class: class F extends Pparent implements Int1{ public static void main(String[] args) { System.out.println(str); } } outs Exception in thread "main" java.lang.Error: Unresolved compilation problem: The field str is ambiguous at test.core.F.main(NullReferenceTest.java:45) I don't see striking differs beetwen both variants. I