streams HW #55
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streams HW #55
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senia-psm
reviewed
Apr 12, 2017
| } | ||
| List<Person> actual = employees.stream() | ||
| .filter(e -> e.getJobHistory().stream() | ||
| .map(JobHistoryEntry::getEmployer).anyMatch(employer -> employer.equals("epam"))) |
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Note that you could use .anyMatch("epam"::equals) instead.
| List<Person> expected = new ArrayList<>(); | ||
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| for (Employee e : employees) { | ||
| if (e.getJobHistory().get(0).equals("epam")) |
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Don't use get - it throws an exception on empty collection.
| Map<String, List<Person>> employeesIndex = getEmployees().stream() | ||
| .map(e -> new PersonEmployerDuration( | ||
| e.getPerson(), | ||
| e.getJobHistory().get(0).getEmployer())) |
senia-psm
reviewed
Apr 13, 2017
| final Map<Key, List<Value>> keyValuesMap1 = valueMap1.entrySet().stream() | ||
| .collect(toMap(e -> keyMap1.get(e.getKey()), | ||
| Map.Entry::getValue, | ||
| (values, values2) -> { |
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You can't get collision here. no need in this parameter.
senia-psm
reviewed
Apr 13, 2017
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| final Map<Key, List<Value>> keyValuesMap2 = valuesMap2 | ||
| .entrySet().stream() | ||
| .collect(toMap(e->keyMap2.get(e.getKey()), |
senia-psm
reviewed
Apr 18, 2017
| values.addAll(values2); | ||
| return values; | ||
| })); | ||
| Map.Entry::getValue)); |
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Actually you may need conflict resolver here for null keys.
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