instance « interface « Java Class Q&A

1. Can we create a instance of java interface?    stackoverflow.com

Is it possible to create an instance of an interface in java? Somewhere I have read that using inner anonymous class we can do it as shown below:

   ...

2. Guice - How to get an instance when all you know is the interface    stackoverflow.com

In all of the Guice examples I have found, getting an instance involves calling Injector.getInstance() with the concrete class as a parameter. Is there a way to get an instance from ...

3. Returning an instance in Java    stackoverflow.com

We cannot create an instance of an interface. But why does Arrays.asList(Object[] a) in the Java API, return a List (List being an interface)? Thank you!

4. Interface instance    coderanch.com

5. Instance variables in interface    coderanch.com

6. Interface accepting instance    coderanch.com

7. Calling a method on an interface instance    coderanch.com

Hi, I have a query due to which I am stuck. Kindly help me someone. I have an interface having a method declaration say 'login()'. Now in my java class where I am NOT implementing the interface, I call the method login() using the interface instance. Now there are other 2 classes(say one.java & two.java) both implementing this interface, both having ...

8. can we creat an instance of an interface?    coderanch.com

Ok, firstly you really should use code tags when posting code. Types, including interface types should start with a capital letter (i.e Sweety). You are defining in an interface a method called toString(), which ever Object will have. There is no need for the Class containing the main method to implement sweety. As to where the constructor comes from, my guess ...

9. in Interface the instance variables are final, right?So what happens in this code?    coderanch.com

interface foo { int k = 0; // this is by default static final right? } public class Test implements foo { public static void main(String args[]) { int i; Test test = new Test (); i= test.k; //we are using object test to access the variable k i= Test.k; //since the variable is static we use the Test Class i= ...

10. Why does this work? (apparent creation of an instance of an interface)    coderanch.com

It's perfectly legitimate to have variables of an interface type. In fact that's basically the whole reason behind an interface, that you can assign an object which implements an interface type to a variable of that type. Which is what is happening in that code. As for "where the implementation for getThisInfo() is", the implementation is in whatever class the object ...

11. Instance of a Interface    forums.oracle.com

12. can we create instance for interface ?    forums.oracle.com

13. Global fields in interface instances    forums.oracle.com

I have a class InputBox which holds a private field called currentString. InputBox implements an interface called Writable. In my main loop every Writable object is iterated over and write(char c) is called on it, in my InputBox class this is implemented as: currentString+=c; But it does not change the variable for the Writable-object, the next time write(char c) is called ...