rspec/rules/S2212/java/rule.adoc

== Why is this an issue?

Method references are specialized lambda expressions for methods that already have a name. They take the form of ``++objectReference::methodName++`` or ``++ClassName::methodName++``. When a lambda does nothing but call an existing method, it can be much clearer to use a method reference instead. 


=== Noncompliant code example

[source,java]
----
Set roster = transferElements(rosterSource, 
      () -> { return new HashSet<>(); }  // Noncompliant
);
----


=== Compliant solution

[source,java]
----
Set roster = transferElements(rosterSource, HashSet::new);
----


ifdef::env-github,rspecator-view[]
'''
== Comments And Links
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=== duplicates: S1612

endif::env-github,rspecator-view[]