In my Android project, I define a few callbacks to operate on button clicks, connectivity events, or UI events such as Dilaog.onShow(). For demo purposes, I have chosen a Runnable interface that must be launched from some Activity code. With Java, I have different ways to express myself. One pattern would be to use anonymous class runO...
Hey, I'm trying to accommodate to Spring JDBC, but what bugs me is using these anonymous classes, where we cannot pass any local variables unless they are final which might be easy to arrange, but what about if I need to loop an array or collection ? I cannot declare "FedModel fm" to be final as it gets reinitialized in the loop, but I...
Hi, I'm trying to create simple GUI program in Java and I couldn't find a proper solution to error cannot refer to a non-final variable inside an inner class defined in a different method. Here's my small code so far; myPanel = new JPanel(); JButton myButton = new JButton("create buttons"); myButton.addActionListener(new ActionListen...
I am creating a list holding Comparable objects and wish to create one object that serves as the minimum of the list, such that it always returns -1 for its compareTo method. Other methods in the list, like print here requires an input of type A. If I compile the code I get the following error: error: type mismatch; found : java.lan...
Can I define an array or a list from anonymous class? like this: persons = new ... [] { new { ID = 1, Name = "Name1"}, new { ID = 2, Name = "Name2"} } ...
I have interface IA, interface IB extends IA and class A implements IA. Now I want to create an anonymous class which extends from A and implements IB. How would that look like? I thought about something like this: new A() implements IB { /* ... */ } ( Error: Type mismatch: cannot convert from A to IB ) or: new IB() extends A { /*...
interface TestA { String toString(); } public class Test { public static void main(String[] args) { System.out.println(new TestA() { public String toString() { return “test”; }}); } } What is the result? A. test B. null C. An exception is thrown at runtime . D. Compilation fails because of an error in line 1. E. Co...
I want to be able to write code like 10 times { doSomething } So I thought I could do that with implicits. When i execute the following code in the Scala REPL it gets defined correctly scala> implicit def intToMyRichInt(count: Int) = { | new { | def times(f: => Unit) = { | 1 to count foreach { _ => f...