Java Stream collector-s methods.md

.collect(Collectors.toCollection(::new));

.collect(Collectors.groupingBy(Person::getAge));

.collect(Collectors.groupingBy(Person::getAge, Collectors.counting()));

.collect(Collectors.groupingBy(Person::getAge, Collectors.mapping( Person::getName, Collectors.toList() )));

.collect(Collectors.partitioningBy(p -> p.getAge()>43));

.collect(Collectors.groupingBy(Person::getAge, Collectors.summingInt(Person::getAge)));

.collect(Collectors.groupingBy(Person::getAge, Collectors.averagingInt(Person::getAge)));

.collect(Collectors.counting()); .map(p -> p.getName()).collect(Collectors.joining("'"));

.collect(Collectors.maxBy( (a1,a2) -> a1.getAge() - a2.getAge() ));