constructor

问题 I'm trying to call a modal function in the constructor in Angular 4 but the function get highlighted that is not properly called and when the page is loaded not error is read in the log and the modal is not popping up as its suppose to. The screen gets dark alright but the text in the modal doesn't show up. constructor(public formBuilder: FormBuilder, public router: Router, public toastr: ToastrService, public http: HttpClient, public modalService: BsModalService,) { if (this.getWardData) {

问题 I'm trying to call a modal function in the constructor in Angular 4 but the function get highlighted that is not properly called and when the page is loaded not error is read in the log and the modal is not popping up as its suppose to. The screen gets dark alright but the text in the modal doesn't show up. constructor(public formBuilder: FormBuilder, public router: Router, public toastr: ToastrService, public http: HttpClient, public modalService: BsModalService,) { if (this.getWardData) {

问题 I have a DLL (written in C#) containing a class with 2 Constructors; a default (no arguments) constructor, and another one with 3 arguments. In VBscript, I want to call the second constructor, but CreateObject only receives a classValue parameter, no possible arguments parameters. I guess the underlying implementation of CreateObject uses the system's CoCreateObject function, which according to this answer does not support arguments, but on the other hand there's QTP/UFT's DotNetFactory that

问题 I have a DLL (written in C#) containing a class with 2 Constructors; a default (no arguments) constructor, and another one with 3 arguments. In VBscript, I want to call the second constructor, but CreateObject only receives a classValue parameter, no possible arguments parameters. I guess the underlying implementation of CreateObject uses the system's CoCreateObject function, which according to this answer does not support arguments, but on the other hand there's QTP/UFT's DotNetFactory that

问题 Is it possible in Java to have a constructor return another instance of the class, rather than constructing/returning itself? Kinda like public class Container { private static Container cachedContainer = new Container(5,false); private int number; public Container(int number, boolean check) { if (number == 5 && check) { return cachedContainer; // <-- This wouldn't work } this.number = number; } } In that example, if you create an object containing the number 5 (and use the "check" flag), it

问题 So I was playing around with defining a TrieSet datatype (even though I know I don't need to): module Temp where import Data.Map data TrieSet a = Nonterminal (Data.Map a (TrieSet a)) | Terminal (Data.Map a (TrieSet a)) insert :: Ord a => [a] -> TrieSet a -> TrieSet a insert [] (_ m) = Terminal m insert (a:as) (c m) = c $ insertWith (insert as . flip const) a (insert as $ Nonterminal empty) m When I got an error I've never seen before: % ghc -c Temp.hs Temp.hs:8:11: Parse error in pattern So

问题 In my typescript I'm trying to create/clone an child-object via a method in the base-class. This is my (simplified) setup. abstract class BaseClass<TCompositionProps> { protected props: TCompositionProps; protected cloneProps(): TCompositionProps { return $.extend(true, {}, this.props); } // can be overwriten by childs constructor(props: TCompositionProps){ this.props = props; } clone(){ const props = this.cloneProps(); return this.constructor(props); } } interface IProps { someValues: string

问题 Reading this article about JSR-133, it says: all of the writes to final fields (and to variables reachable indirectly through those final fields) become "frozen," ... If an object's reference is not allowed to escape during construction, then once a constructor has completed and a thread publishes a reference to an object, that object's final fields are guaranteed to be visible ... The one caveat with initialization safety is that the object's reference must not "escape" its constructor --

问题 In my project, lombok is used to avoid writing getters and setters for a class. I have two classes Child extends Parent : @Value @Builder @AllArgsConstructor @JsonIgnoreProperties(ignoreUnknown = true) public class Parent { @Nonnull @JsonProperty("personId") private final String personId; @JsonProperty("personTag") private final String personTag; ... } And @Value @Builder @AllArgsConstructor @JsonIgnoreProperties(ignoreUnknown = true) public class Child extends Parent { @Nonnull @JsonProperty

问题 struct CLICKABLE { int x; int y; BITMAP* alt; BITMAP* bitmap; CLICKABLE() { alt=0; } }; CLICKABLE input={1,2,0,0}; This code gives me the following error: Could not convert from brace-enclosed initializer list Could someone explain me why the compiler is giving me this error, and how I can fix it? I'm still learning the language. 回答1: Your class has a constructor, so it isn't an aggregate, meaning you cannot use aggregate initialization. You can add a constructor taking the right number and