Is there a way to use doubleColon to invoke second level method.
Example ClassA::getClassBObject::classBMethod in lambda invocation
Double Colon lambda for two levels method invocation
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2 Answers
What you are expecting is called chaining. Method references does not support chaining.
Read more about Method References.
You could compose the functions:
((Function<ClassA, ClassB>) ClassA::getClassBObject).andThen(ClassB::classBMethod)
But you're probably better off with just (x, arg) -> x.getClassBObject().classBMethod(arg).
More info on the composition approach: https://stackoverflow.com/a/32838924/2093695
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