A list contains at least one value from another list (Java 8)

问题

My function finds if from a list of given words at list one word is valid in the page. So when page contains words I have written it as follows: (Simplified version)

private boolean atLeastOneWordIsValidInThePage(Page page, Set<Long>  wordIdsToCheck) 
    Set<Long> wordIds = page.getWords().stream()
                .filter(word -> word.isValid())
                .map(word->getWordId())
                .collect(Collectors.toSet());
return words.stream().anyMatch((o) -> wordIds.contains(o));

Is it the best java 8 practice to write it?
I want to stop searching when the first match is found.

回答1:

There is no need to open two separate streams. You should be able to chain anyMatch directly to the map function as follows :

return page.getWords().stream()
            .filter(word -> word.isValid())
            .map(word->getWordId())
            .anyMatch((o) -> words.contains(o));

来源：https://stackoverflow.com/questions/41920852/a-list-contains-at-least-one-value-from-another-list-java-8