Java 8 Lambdas - equivalent of c# OfType

Question

I am learning the new java 8 features now, after 4 years exclusively in C# world, so lambdas are on top for me. I am now struggling to find an equivalent for C#\'s \"OfType\" me

Answer 1

You can create a Function containing the Stream pipeline, which reduces its invocation.

    Function,List> ofSub =
       bl -> bl.stream()
               .filter(x -> x instanceof SpecificNode)
               .map(n -> (SpecificNode) n)
               .collect(Collectors.toList());

For instance:

    for( SpecificNode s: ofSub.apply( myNodes ) ){
         //...
    }