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Questions tagged [anonymous-class]

An anonymous class is a local class without a name. An anonymous class is defined and instantiated in a single succinct expression using the new operator.

An anonymous class is a local class without a name. An anonymous class is defined and instantiated in a single succinct expression using the new operator. While a local class definition is a statement in a block of code, an anonymous class definition is an expression, which means that it can be included as part of a larger expression, such as a method call. When a local class is used only once, consider using anonymous class syntax, which places the definition and use of the class in exactly the same place.

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Anonymous class implementing interface

I have the following code inside a method: var list = new[] { new { Name = "Red", IsSelected = true }, new { Name = "Green", IsSelected = false }, new { Name = "Blue", IsSelected = false }, }; I would like to call a function that…
flayn
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When do I need anonymous class in C++?

There's a feature called anonymous class in C++. It's similar with anonymous struct in C. I think this feature is invented because of some needs, but I can't figure out what that is. Can I have some example which really needs anonymous class?
eonil
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How are anonymous classes compiled in Java?

I've heard that Java bytecode actually doesn't support any kind of unnamed classes. How does javac translate unnamned classes to named ones?
keiter
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Proguard removes Anonymous class in Anonymous class in Java

I have a issue that Proguard is not working when you declare a anonymous class within a anonymous class. This is what it looks like in a basic example: public class Class1 { public void function1 (){ new Class2(){ @Override …
Arne Fischer
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When to use anonymous classes?

I run into some code which contains anonymous classes. I haven't met with anonymous classes before, so I did some research on them. My main area of interest is java, so I checked Oracle's tutorial of anonymous classes. I understand the mechanism and…
Tamas G.
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Why is an anonymous class in a static context valid

I have a misunderstanding about what an anonymous class in Java is. Consider the following simple example: public static void main (String[] args) throws java.lang.Exception { B b = new B(){ }; System.out.println(b.b); } interface B{ int b…
St.Antario
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Reference to Public Enum results in Anonymous Class

I'm getting an anonymous class at compile-time that I'm not expecting. Relevant code follows, then a more detailed explanation: Entirety of CircuitType.java: public enum CircuitType { V110A20, V110A30, V208A20, V208A30 } From Auditor.java, lines…
Maarx
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How do I use Powermockito to mock the construction of new objects when testing a method in an anonymous class?

I woud like to write a JUnit test to verify that the code below uses a BufferedInputStream: public static final FilterFactory BZIP2_FACTORY = new FilterFactory() { public InputStream makeFilter(InputStream in) { // a lot of other…
Zack
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What's a good example for making use of an anonymous class in PHP7

As I looked for the new PHP7-features I stumbled upon anonymous classes. I didn't understand when they should become useful, and looked for an example. I read this article, but I don't see the benefits of this feature. In the last section before the…
Alexander Behling
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Value of "this" in an anonymous class vs a lambda expression

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 = () ->…
Mehraj Malik
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Where is final parameter stored in anonymous class instance?

I have the following static factory method that creates a list view out of an int array: public static List newInstance(final int[] numbers) { return new AbstractList() { @Override public Integer get(int index)…
Kewei Shang
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Virtual tables on anonymous classes

I have something similar to this in my code: #include #include struct Base { virtual int Virtual() = 0; }; struct Child { struct : public Base { virtual int Virtual() { return 1; } } First; struct : public Base …
GhassanPL
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How to dynamically create an anonymous class that extends an abstract class in PHP?

Simply, let me explain by an example. start()); ?> This is from PHP manual. I am wondering if there is a way to do this in more…
jlai
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Two double nested anonymous inner classes. How to get 1st level anonymous class members?

Inner class is Adapter, inner-inner class is Listener. How to access (obscured) Adapter members/methods from Listener? list.setAdapter(new Adapter() { public View getView() { // ... button.setListener(new Listener() { public void…
Chloe
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How to add @SerialVersionUID to an anonymous class?

I want to translate the following piece of code from Java to Scala: Foo foo = new Foo() { private static final long serialVersionUID = 12345L; } Class Foo is an abstract class. How does the equivalent code look like in Scala?
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