interface

问题 According to http://www.thinkbottomup.com.au/site/blog/C%20%20_Mixins_-_Reuse_through_inheritance_is_good But hang on a minute, none of this helps us plug into our Task Manager framework as the classes do not implement the ITask interface. This is where one final Mixin helps - a Mixin which introduces the ITask interface into the inheritance hierarchy, acting as an adapter between some type T and the ITask interface: template< class T > class TaskAdapter : public ITask, public T { public:

问题 What is the difference between these two declarations of functions in TypeScript Interfaces? interface IExample { myFunction(str: string): void; } and interface IExample { myFunction: (str: string) => void; } 回答1: These declarations are completely equivalent. The only relevant difference here is that the second form can't be used for function overloads: // OK interface Example { myFunction(s: string): void; myFunction(s: number): void; } // Not OK interface Example { myFunction: (s: string) =

问题 I have the following small example(vala 0.18.1): namespace Learning { public interface IExample<T> { public abstract void set_to(T val); public abstract T get_to(); } public class Example : Object, IExample<double> { private double to; public void set_to(double val) { to = val; } public double get_to() { return to; } public string to_string() { return "Example: %.5f".printf(to); } } public class Test { public static void main(string[] args) { stdout.printf("Start test\n"); Example ex = new

问题 I'm trying to implement the first example http://www.dotnetperls.com/convert-list-string into my method but I'm having a hard time matching the 2nd argument for the method: string printitout = string.Join(",", test.ToArray<Location>); error message: The best overloaded method match for 'string.Join(string, System.Collections.Generic.IEnumerable<string>)' has some invalid arguments All the IList interfaces are implemented with the IEnurmerable too (just not listed here unless someone wants me

问题 I have the following code Type type = ... var events=type.GetEvents( BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public).ToList(); However this is also returning me events declared on parent interfaces. For example Both UIElement ContentElement implement IInputElement which defines the event // // Summary: // Occurs when the mouse pointer moves while the mouse pointer is over the element. event MouseEventHandler PreviewMouseMove; but the above call to GetEvents with all

问题 I need to perform onClick to call the onItemSelected listener method of another class.I don't know how to call that method in Image button onClick listener.So that it will move to HomeFirstFragment Class. ItmeSelectedListener public interface ItemSelectedListener { public void onItemSelected(final int position, final String content); } LayoutActivity.java: public class LayoutActivity extends Activity implements OnClickListener { ImageButton btn_click; @Override public void onCreate(Bundle

问题 I was reading about Interfaces in a Book and I came upon this Line that confused me. Interfaces are syntactically similar to classes, but they lack instance variables. As far as I know about Interfaces , we can define variables inside an Interface which are by default final . My question is, What does that Line mean? and What is the Difference between an Instance Variable and the Variable defined in the Interface ?? 回答1: My question is, What does that Line mean? Amongst other things, it means

问题 What information would a web application server wish to log, and why? From what I understand org.apache.commons.logging.Log is an interface that abstracts the functionality provided by other Logging classes, and the same applies to the interface LogFactory. Code I am trying to understand has - Log auditLogger = LogFactory.getLog(someString); How is the String someString used to identify what LogFactory to generate? How can I see the implementation of the Log and LogFactory classes being used?

问题 I need help with a Java homework problem. I have two bags, say bag1 containing the strings A , B , C and D and bag2 containing strings E , F , G and H . I need to write a BagInterface for the union of those two bag then a class call ArrayBag<T> implements BagInterface<T> . BagInterface I was thinking something like this: public interface BagInterface<T> { public T union(T[] item); } public class ArrayBag<T> implements BagInterface<T> { private final static int DEFAULT_CAP = 4; private int

问题 I'm pretty new to Java and I don't understand what is this structure. I know what is an interface and how is defined, but in this case, I really don't know. Could you tell what is about? public interface WebConstants { public interface Framework { String ACTION = "action"; } public interface Look { String LIST_CONT = "list.cont"; } } 回答1: Every field inside an interface is implicitly public, static, and final. In this case WebConstants declares an inner interface (public, static, and final)