From 7f6e6d27c1b157801559e5e4dd7a3f6905226a60 Mon Sep 17 00:00:00 2001 From: MrRaveGit Date: Sun, 31 May 2026 13:32:06 +0300 Subject: [PATCH 1/3] added worked code --- .../java/practice/CandidateValidator.java | 21 ++++++++- src/main/java/practice/StreamPractice.java | 44 ++++++++++++++++--- 2 files changed, 56 insertions(+), 9 deletions(-) diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java index 8d2e56c0e..f6255a4ed 100644 --- a/src/main/java/practice/CandidateValidator.java +++ b/src/main/java/practice/CandidateValidator.java @@ -1,5 +1,22 @@ package practice; -public class CandidateValidator { - //write your code here +import java.util.function.Predicate; +import model.Candidate; + +public class CandidateValidator implements Predicate { + + private static final String NATIONALITY = "Ukrainian"; + private static final int MIN_PERIOD_IN_UKR = 10; + private static final int MIN_AGE = 35; + private static final String PERIOD_SEPARATOR = "-"; + + @Override + public boolean test(Candidate candidate) { + String [] years = candidate.getPeriodsInUkr().split(PERIOD_SEPARATOR); + int period = Integer.parseInt(years[1]) - Integer.parseInt(years[0]); + + return candidate.getNationality().equals(NATIONALITY) + && candidate.getAge() >= MIN_AGE + && period >= MIN_PERIOD_IN_UKR && candidate.isAllowedToVote(); + } } diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 57b1ca2e2..4168e1fb2 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -1,8 +1,11 @@ package practice; -import java.util.Collections; +import java.util.Arrays; import java.util.List; +import java.util.stream.Collectors; +import java.util.stream.IntStream; import model.Candidate; +import model.Cat; import model.Person; public class StreamPractice { @@ -14,7 +17,13 @@ public class StreamPractice { * "Can't get min value from list: < Here is our input 'numbers' >" */ public int findMinEvenNumber(List numbers) { - return 0; + return numbers.stream() + .flatMap(s -> Arrays.stream(s.split(","))) + .mapToInt(Integer::parseInt) + .filter(n -> (n % 2) == 0) + .min() + .orElseThrow(() -> new RuntimeException("Can't get min value from list: " + + numbers)); } /** @@ -23,7 +32,11 @@ public int findMinEvenNumber(List numbers) { * But before that subtract 1 from each element on an odd position (having the odd index). */ public Double getOddNumsAverage(List numbers) { - return 0D; + return IntStream.range(0, numbers.size()) + .map(i -> i % 2 != 0 ? numbers.get(i) - 1 : numbers.get(i)) + .filter(i -> i % 2 != 0) + .average() + .getAsDouble(); } /** @@ -35,7 +48,10 @@ public Double getOddNumsAverage(List numbers) { * Example: select men who can be recruited to army (from 18 to 27 years old inclusively). */ public List selectMenByAge(List peopleList, int fromAge, int toAge) { - return Collections.emptyList(); + return peopleList.stream() + .filter(person -> person.getAge() >= fromAge + && person.getAge() <= toAge && person.getSex() == Person.Sex.MAN) + .collect(Collectors.toList()); } /** @@ -50,7 +66,12 @@ public List selectMenByAge(List peopleList, int fromAge, int toA */ public List getWorkablePeople(int fromAge, int femaleToAge, int maleToAge, List peopleList) { - return Collections.emptyList(); + return peopleList.stream().filter(person -> person.getSex() == Person.Sex.WOMAN + && person.getAge() >= fromAge && person.getAge() <= femaleToAge + || person.getSex() == Person.Sex.MAN + && person.getAge() >= fromAge && person.getAge() <= maleToAge) + .toList(); + } /** @@ -59,7 +80,12 @@ public List getWorkablePeople(int fromAge, int femaleToAge, * return the names of all cats whose owners are women from `femaleAge` years old inclusively. */ public List getCatsNames(List peopleList, int femaleAge) { - return Collections.emptyList(); + return peopleList.stream() + .filter(person -> person.getAge() >= femaleAge + && person.getSex() == Person.Sex.WOMAN) + .flatMap(person -> person.getCats().stream()) + .map(Cat::getName) + .collect(Collectors.toList()); } /** @@ -75,6 +101,10 @@ public List getCatsNames(List peopleList, int femaleAge) { * parametrized with Candidate in CandidateValidator. */ public List validateCandidates(List candidates) { - return Collections.emptyList(); + return candidates.stream() + .filter(new CandidateValidator()) + .map(Candidate::getName) + .sorted() + .collect(Collectors.toList()); } } From 66043cad7f293d556629ae49c52042fa78bd301d Mon Sep 17 00:00:00 2001 From: MrRaveGit Date: Mon, 1 Jun 2026 18:42:44 +0300 Subject: [PATCH 2/3] added full worked code --- src/main/java/practice/StreamPractice.java | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 4168e1fb2..a631477e6 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -2,6 +2,7 @@ import java.util.Arrays; import java.util.List; +import java.util.NoSuchElementException; import java.util.stream.Collectors; import java.util.stream.IntStream; import model.Candidate; @@ -19,6 +20,7 @@ public class StreamPractice { public int findMinEvenNumber(List numbers) { return numbers.stream() .flatMap(s -> Arrays.stream(s.split(","))) + .map(String::trim) .mapToInt(Integer::parseInt) .filter(n -> (n % 2) == 0) .min() @@ -36,7 +38,7 @@ public Double getOddNumsAverage(List numbers) { .map(i -> i % 2 != 0 ? numbers.get(i) - 1 : numbers.get(i)) .filter(i -> i % 2 != 0) .average() - .getAsDouble(); + .orElseThrow(() -> new NoSuchElementException()); } /** @@ -50,7 +52,7 @@ public Double getOddNumsAverage(List numbers) { public List selectMenByAge(List peopleList, int fromAge, int toAge) { return peopleList.stream() .filter(person -> person.getAge() >= fromAge - && person.getAge() <= toAge && person.getSex() == Person.Sex.MAN) + && person.getAge() <= toAge && person.getSex().equals(Person.Sex.MAN)) .collect(Collectors.toList()); } @@ -66,9 +68,9 @@ public List selectMenByAge(List peopleList, int fromAge, int toA */ public List getWorkablePeople(int fromAge, int femaleToAge, int maleToAge, List peopleList) { - return peopleList.stream().filter(person -> person.getSex() == Person.Sex.WOMAN + return peopleList.stream().filter(person -> person.getSex().equals(Person.Sex.WOMAN) && person.getAge() >= fromAge && person.getAge() <= femaleToAge - || person.getSex() == Person.Sex.MAN + || person.getSex().equals(Person.Sex.MAN) && person.getAge() >= fromAge && person.getAge() <= maleToAge) .toList(); From e8b95ac3c1dab6fa5ac20147baf8b02019e24100 Mon Sep 17 00:00:00 2001 From: MrRaveGit Date: Mon, 1 Jun 2026 18:50:09 +0300 Subject: [PATCH 3/3] now all worked --- src/main/java/practice/StreamPractice.java | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index a631477e6..bb728d0a7 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -70,7 +70,7 @@ public List getWorkablePeople(int fromAge, int femaleToAge, int maleToAge, List peopleList) { return peopleList.stream().filter(person -> person.getSex().equals(Person.Sex.WOMAN) && person.getAge() >= fromAge && person.getAge() <= femaleToAge - || person.getSex().equals(Person.Sex.MAN) + || person.getSex().equals(Person.Sex.MAN) && person.getAge() >= fromAge && person.getAge() <= maleToAge) .toList(); @@ -84,7 +84,7 @@ public List getWorkablePeople(int fromAge, int femaleToAge, public List getCatsNames(List peopleList, int femaleAge) { return peopleList.stream() .filter(person -> person.getAge() >= femaleAge - && person.getSex() == Person.Sex.WOMAN) + && person.getSex().equals(Person.Sex.WOMAN)) .flatMap(person -> person.getCats().stream()) .map(Cat::getName) .collect(Collectors.toList());