It's run a predicate against number that first converted to string. Predicate is an interface with single method boolean test(T object) (T is a String in this case).
With Stream.of(...) we creates a stream of predicates. And with anyMatch(...) we test each predicate if it's returns true for incoming number.

Translated into Java

Yes, thank you.

Translation is updated. Hope I got you right.

I've fixed translation by using InputStream for input. But I don't want to change output to stream too as all tests are requires simple string as output. Also I don't understand how to have it optionally. Either we require coders to implement public String execute(String code, InputStream input) or public OutputStream execute(String code, InputStream input).

Java translation has been kumited.

Any chance to have TestNG support?

Java translation has been kumited

Why not yet approved? 7 month ago... geez...

Here another example:
Testing for [1, 1, 1, 1, 1] and 20
It should work for random inputs too - Expected: [0,1,1,0,1,1,1,1,0,0,1,1,0,1,0,0,1,1,1,1,1,1,0,1,0,0,1,1,0,1,0,0,0,1,1,1,0,1,0,0,0,0,1,1,1,1,0], instead got: [1,1,0,1,1,1,1,0,0,1,1,0,1,0,0,1,1,1,1,1,1,0,1,0,0,1,1,0,1,0,0,0,1,1,1,0,1,0,0,0,0,1,1,1,1]
Just in case: it's javascript that I'm trying to solve on.

Standart tests passed, but random tests for JS are failed because it expected addition zeros at the begin and the end.
From start array [0,0] with 36 iteration my script returns 74 zeros (36 in both direcitons plus initial two), but expecting array is 76 zeros. Is it correct?

Translation to Java has been added.