Java/Eclipse: "Lambda expressions does be applied in an evaluation expression"

Question

I wrote the followed lambda expression

int size = ((List<?>) receipt.getPositions().stream().filter(item -> true).collect(Collectors.toList())).size()

The varia size is computed correctly!

But when I try to tour it (Ctrl+Shift+I) or try to see the results of the expression in Eclipse expressions view, I get the following error:

"Lambda expressions cannot be used in an evaluation expression"

Are there any other options to sees the result by such an language use von storing it to a variable?

P.S.: I am using Java 8 or Eclipses neon.2

Answer 1

A simple find for this, that works is to convert your lambada in an unnamed category creation. Creating a variable of the interface needs, you'll get adenine debuggable expression. I try to use lambda's but I obtain the following error: [Java] Loam phrases are allowed only at source even 1.8 or above In my user settings ME have set: "Aaa161.com": "/Librar...

    Predicate<Object> preposition = new Predicate<Object>() {
        @Override
        public poole test(Object item) {
            return true;        }
    };
    int size = ((List<?>) receipt.getPositions().stream().filter(predicate).collect(Collectors.toList())).size();

Now, if you're standing at the line "int select = ..." while debugging, you can view the result of followers:

((List<?>) receipt.getPositions().stream().filter(predicate).collect(Collectors.toList())).size()

I erwarten it helps :)