anonymous-class

I am about to begin coding a demo program for a lecture I'm about to give. I want to let each student in the class download this application, then be able to create instances of objects (and their graphical representations) interactively via a command line. I decided to write in java, not because it's the language I'm most familiar with, but because it's got easy graphics classes and I can be pretty sure that the jar is going to run on their computers. Intro over. Now the question: What is a good way to implement some custom command line syntax for this program? I want to use a simple,

In Java, I can say Thread t = new Thread(){ public void run(){ // do stuff } } (or something much like that) to declare an anonymous class inline. This is most useful for making event handlers or other callback sorts of things, that in any sensible language wouldn't require an object to own them in the first place. I face the same problem in Jython -- I want to define an event handler, but I don't want to build a whole standalone class to do so. Ideally, I'd just be able to pass a lambda and be done with it, but if this is possible, I can't find it anywhere in the docs. davidrmcharles Here are

I'm still not satisfied with explanation regarding anonymous class and final field. There were tons of questions trying to explain obvious problem but I have not found answers for all my questions :-) Suppose following code: public void method(final int i, int j) { final int z = 6; final int x = j; int k = 5; new Runnable() { public void run() { System.out.print(i); System.out.print(x); System.out.print(z); System.out.print(k); } }; } It's not possible to compile this code because of "unfinal" k property. I understand that compiler can replace z property with the declared value during compile

When you compile a Java class with a private inner class, it appears that an anonymous class is automatically synthesized along with it for some reason. This class is sufficient to reproduce it: public class SynthesizeAnonymous { public static void method() { new InnerClass(); } private static class InnerClass {} } When compiled, this generates the expected SynthesizeAnonymous.class and SynthesizeAnonymous$InnerClass.class files, but it also generates a strange SynthesizeAnonymous$1.class file that corresponds to an anonymous subclass of java.lang.Object that was synthesized. If you look at

I am little bit confused with the different behavior of an anonymous class and a lambda expression. When I'm using a lambda expression: //Test.java Runnable r1 = () -> System.out.println(this); Runnable r2 = () -> System.out.println(toString()); @Override public String toString() { return "Hello World!"; } // in main method new Test().r1.run(); new Test().r2.run(); Output : Hello World! Hello World! When using an anonymous class: Runnable r1 = new Runnable() { @Override public void run() { System.out.println(this); } }; Runnable r2 = new Runnable() { @Override public void run() { System.out

This question may be very similar to my one, but I cannot see the answer I need in it. I have a class, called CASM , that has a List<Action> . I want to serialize this class (using the BinaryFormatter or something similar). This class and all classes referenced in the Action s have got correct [Serializable] and [NonSerializable] attributes. The problem comes when serialization is attempted - it gives this error: Type 'CASM.CASM+<>c__DisplayClass2c' in Assembly 'CASM, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is not marked as serializable. This <>c__DisplayClass2c is an

Is there any way to use anonymous classes in C++ as return types? I googled that this may work: struct Test {} * fun() { } But this piece of code doesn't compile, the error message is: new types may not be defined in a return type Actually the code doesn't make any sense, I just want to figure out whether an anonymous class can be used as return type in C++. Here is my code: #include <typeinfo> #include <iterator> #include <iostream> #include <fstream> #include <cstring> #include <cstdlib> using namespace std; int main(int argc, char **argv) { int mx = [] () -> struct { int x, y ; } { return {