Java Syntax question

The last time I used Java was 1.5, could someone let me know what the ::new does ?

namedWriteables.add(new NamedWriteableRegistry.Entry(EvaluationMetric.class, RecallAtK.NAME, RecallAtK::new));

Comments

[clementDeb]

Hello,
it creates a new instance of RecallAtK

[smuschel]

Java came a long way since version 5. Java 8 introduced method references, see baeldung.com/java-method-references for examples...