interface

问题 Is there any way to loop all over keys and values of json and thereby confirming and replacing a specific value by matched path or matched compared key or value and simultaneously creating a new interface of out of the json after being confirmed with the key new value in Golang. This an example i saw that loops through all values https://play.golang.org/p/xtiT2iGocBg but i have no idea of replacing values by matched path or value 回答1: I finally succeeded in getting keys/values and can same

问题 What is the fastest way in Eclipse to implement a new interface and generate delegate implementations to an existing class? For instance given an existing class Foo , suppose I want it to implement Iterator<Integer> using a delegate Iterator<Integer> . 回答1: Add the delegate field Iterator<Integer> and the implements Iterator<Integer> to foo as follows: public class Foo implements Iterator<Integer> { Iterator<Integer> iterator; } Select the source menu and then "Generate Delegate Methods".

问题 I'm trying to build a library that basically wraps our api. Basically, the structure im going for is something like this: MySDK mySDK = new MySDK("username", "password"); mySDK.getPlaylistInfo("3423", 2323, new CustomCallback<>(){ //on response //on failure }); So with vanilla Retrofit, an api call usually looks something like the following: ApiService api = retrofit.create(ApiService.class); Call<Response> call = api.getPlaylistInfo() call.enqueue(new Callback<Response>() { @Override public

问题 Is it possible to implement an interface in a base class and allow calling/overriding the implemented method in the first derived class level but prevent calling it from any further derived classes? public interface IInterfaceSample { bool Test(); } public class Base: IInterfaceSample { public virtual bool Test() { return True; } } public class Sub1: Base { //I need to be able to override the Test method here public override bool Test() { return True; } } //Under a separate project: public

问题 Is it possible to implement an interface in a base class and allow calling/overriding the implemented method in the first derived class level but prevent calling it from any further derived classes? public interface IInterfaceSample { bool Test(); } public class Base: IInterfaceSample { public virtual bool Test() { return True; } } public class Sub1: Base { //I need to be able to override the Test method here public override bool Test() { return True; } } //Under a separate project: public

问题 Below is the failed attempt which I came up with, referring to Java Generic Enum class using Reflection. Wanted to find a better way to do this. Couple of issues I find with this approach: Each and every time I need to pass the class type. Example - EnumUtility.fromKey(Country.class, 1) fromSet is duplicated in both City and Country ‌ public enum City implements BaseEnumInterface { TOKYO(0), NEWYORK(1); private final int key; public static Set<Integer> fromValue(Set<City> enums) { return

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: Interface vs Abstract Class (general OO) Can I ever instantiate an Abstract class? If so, why would I not make all my non-sealed classes abstract? If I can't instantiate it, then what is the difference from an interface? Can the abstract class have "base" class functionality? Is there more to the difference between an interface and an abstract class than that? 回答1: You can't instantiate an abstract class. The

问题 I got a bug in Go when using an interface{} as function parameter type, when given a non-pointer type, and using json.Unmarshal with it. Because a piece of code is worth a thousand words, here is an example: package main import ( "encoding/json" "fmt" ) func test(i interface{}) { j := []byte(`{ "foo": "bar" }`) fmt.Printf("%T\n", i) fmt.Printf("%T\n", &i) json.Unmarshal(j, &i) fmt.Printf("%T\n", i) } type Test struct { Foo string } func main() { test(Test{}) } Which outputs: main.Test

问题 How can I implement, for example, a String type of a non-generic-interface with a generic method ? Here is the interface: // non-generic-class interface I{ public <T> T doI(T t); } 回答1: All the <T> in this interface means is that the type T passed to the method is the same as the type T returned from the method. Implementation requires some use of the symbol T as if it was a class Like public <T> T doI(T t){ Object a = t.getClass().newInstance(); return (T) a; } You can then call it with

问题 I don't necessarily see a grandiose benefit of interfaces inheriting interfaces. Consider the following three interfaces, the third inheriting the other two interface IOne { } interface ITwo { } // interface inheritance interface IAll : IOne, ITwo { } Is it best to class C : IOne, ITwo { ... } or class C : IAll { ... } If the latter can be beneficial then why not just create IAll to have all the methods of both IOne and ITwo without inheriting from them? After all it's an interface. Is