code like this public class LambdaTest { public static void main(String[] args) { final Animal animal = Dog::new; animal.eat(); } } @FunctionalInterface interface Animal { void eat(); } clas...

Why doesn't the first of the following examples work? run(R::new); method R.run is not called. run(new R()); method R.run is called. Both examples are compiled-able. public class ConstructorRe...

Assume the following code: class ConstructMe<T> {} data class Test<T> constructor(var supplier: () -> ConstructMe<T>) {} fun main(args: Array<String>) { works<Int&g...

Given the following code: package com.gmail.oksandum.test; import java.util.ArrayList; import java.util.List; public class Test { public static void main(String[] args) { } public void foo(...

I learn new features of Java 8. I am playing with different examples and I have found a strange behaviour: public static void main(String[] args) { method(Test::new); } static class Test{...

I am reading Java 8 book, and it comes with a sample I reproduce: @FunctionalInterface public interface Action { public void perform(); } An Implementor: public final class ActionImpl implements ...

In Java we have the Class::new syntax for constructor references. I know, there are callable references for methods, but how about constructors? A typical use case for me would be factories.

I am creating a supplier for an inner class constructor using the lambda ctx -> new SpectatorSwitcher(ctx). IntelliJ suggested that I change it to SpectatorSwitcher::new instead. SpectatorSwitch...