P E N C I L
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Stream

Collectors

Collectors.count()

Collectors.groupingBy(v->key, Collectors.toList()) 2nd element is the downstream collector to collect for each list

Create Stream

Arrays.stream(int[])

Stream.of(v1, v2)

s.chars().mapToObject(v-> (Character)(char)(v)) => IntStream

Check

allMatch()

anyMatch()