From 6df4e01250abe3d966d7f9d72beb1f7924d8ff23 Mon Sep 17 00:00:00 2001 From: Polina Date: Tue, 12 May 2026 23:56:41 +0300 Subject: [PATCH 1/3] did --- src/main/java/practice/StreamPractice.java | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 57b1ca2e2..831e3da79 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -1,7 +1,11 @@ package practice; +import java.util.Arrays; import java.util.Collections; import java.util.List; +import java.util.NoSuchElementException; +import java.util.stream.IntStream; + import model.Candidate; import model.Person; @@ -14,7 +18,13 @@ 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(","))) + .map(String::trim) + .map(Integer::parseInt) + .filter(n -> n % 2 == 0) + .min() + .orElseThrow(() -> new RuntimeException("Can't get min value from list: " + numbers)); } /** @@ -23,7 +33,11 @@ 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 == 1 ? numbers.get(i) - 1 : numbers.get(i)) + .filter(n -> n % 2 == 1) + .average() + .orElseThrow(() -> new NoSuchElementException("Wrong number")); } /** From d3ee1a2203f72838e8856b97ad0ca1e54f9755c5 Mon Sep 17 00:00:00 2001 From: Polina Date: Wed, 13 May 2026 16:27:23 +0300 Subject: [PATCH 2/3] did all required tasks --- .../java/practice/CandidateValidator.java | 17 ++++++++-- src/main/java/practice/StreamPractice.java | 34 ++++++++++++++----- 2 files changed, 41 insertions(+), 10 deletions(-) diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java index 8d2e56c0e..21e1a9f0b 100644 --- a/src/main/java/practice/CandidateValidator.java +++ b/src/main/java/practice/CandidateValidator.java @@ -1,5 +1,18 @@ package practice; -public class CandidateValidator { - //write your code here +import java.util.function.Predicate; +import model.Candidate; + +public class CandidateValidator implements Predicate { + + @Override + public boolean test(Candidate candidate) { + String[] years = candidate.getPeriodsInUkr().split("-"); + int yearsInUkr = Integer.parseInt(years[1]) - Integer.parseInt(years[0]); + + return candidate.getAge() >= 35 + && candidate.isAllowedToVote() + && "Ukrainian".equals(candidate.getNationality()) + && yearsInUkr >= 10; + } } diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 831e3da79..30401834e 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -1,12 +1,13 @@ package practice; import java.util.Arrays; -import java.util.Collections; +import java.util.Comparator; import java.util.List; import java.util.NoSuchElementException; +import java.util.stream.Collectors; import java.util.stream.IntStream; - import model.Candidate; +import model.Cat; import model.Person; public class StreamPractice { @@ -23,8 +24,9 @@ public int findMinEvenNumber(List numbers) { .map(String::trim) .map(Integer::parseInt) .filter(n -> n % 2 == 0) - .min() - .orElseThrow(() -> new RuntimeException("Can't get min value from list: " + numbers)); + .min(Comparator.naturalOrder()) + .orElseThrow(() -> new RuntimeException("Can't get min value from list: " + + numbers)); } /** @@ -49,7 +51,10 @@ 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(p -> p.getSex() == Person.Sex.MAN + && p.getAge() >= fromAge && p.getAge() <= toAge) + .collect(Collectors.toList()); } /** @@ -64,7 +69,11 @@ 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(p -> p.getSex() == Person.Sex.MAN + ? p.getAge() >= fromAge && p.getAge() <= maleToAge + : p.getAge() >= fromAge && p.getAge() <= femaleToAge) + .collect(Collectors.toList()); } /** @@ -73,7 +82,11 @@ 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(p -> p.getSex() == Person.Sex.WOMAN && p.getAge() >= femaleAge) + .flatMap(p -> p.getCats().stream()) + .map(Cat::getName) + .collect(Collectors.toList()); } /** @@ -89,6 +102,11 @@ public List getCatsNames(List peopleList, int femaleAge) { * parametrized with Candidate in CandidateValidator. */ public List validateCandidates(List candidates) { - return Collections.emptyList(); + CandidateValidator validator = new CandidateValidator(); + return candidates.stream() + .filter(validator) + .sorted(Comparator.comparing(Candidate::getName)) + .map(Candidate::getName) + .collect(Collectors.toList()); } } From 9c2958cd7a533de09f12559478c361686ac0639c Mon Sep 17 00:00:00 2001 From: Polina Date: Wed, 13 May 2026 16:35:53 +0300 Subject: [PATCH 3/3] did all changes --- src/main/java/practice/CandidateValidator.java | 7 +++++-- src/main/java/practice/StreamPractice.java | 6 +++--- 2 files changed, 8 insertions(+), 5 deletions(-) diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java index 21e1a9f0b..c42654e0d 100644 --- a/src/main/java/practice/CandidateValidator.java +++ b/src/main/java/practice/CandidateValidator.java @@ -5,14 +5,17 @@ public class CandidateValidator implements Predicate { + private static final int MIN_AGE = 35; + private static final int MIN_YEAR = 10; + @Override public boolean test(Candidate candidate) { String[] years = candidate.getPeriodsInUkr().split("-"); int yearsInUkr = Integer.parseInt(years[1]) - Integer.parseInt(years[0]); - return candidate.getAge() >= 35 + return candidate.getAge() >= MIN_AGE && candidate.isAllowedToVote() && "Ukrainian".equals(candidate.getNationality()) - && yearsInUkr >= 10; + && yearsInUkr >= MIN_YEAR; } } diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 30401834e..f1eeec89d 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -52,7 +52,7 @@ public Double getOddNumsAverage(List numbers) { */ public List selectMenByAge(List peopleList, int fromAge, int toAge) { return peopleList.stream() - .filter(p -> p.getSex() == Person.Sex.MAN + .filter(p -> p.getSex().equals(Person.Sex.MAN) && p.getAge() >= fromAge && p.getAge() <= toAge) .collect(Collectors.toList()); } @@ -70,7 +70,7 @@ public List selectMenByAge(List peopleList, int fromAge, int toA public List getWorkablePeople(int fromAge, int femaleToAge, int maleToAge, List peopleList) { return peopleList.stream() - .filter(p -> p.getSex() == Person.Sex.MAN + .filter(p -> p.getSex().equals(Person.Sex.MAN) ? p.getAge() >= fromAge && p.getAge() <= maleToAge : p.getAge() >= fromAge && p.getAge() <= femaleToAge) .collect(Collectors.toList()); @@ -83,7 +83,7 @@ public List getWorkablePeople(int fromAge, int femaleToAge, */ public List getCatsNames(List peopleList, int femaleAge) { return peopleList.stream() - .filter(p -> p.getSex() == Person.Sex.WOMAN && p.getAge() >= femaleAge) + .filter(p -> p.getSex().equals(Person.Sex.WOMAN) && p.getAge() >= femaleAge) .flatMap(p -> p.getCats().stream()) .map(Cat::getName) .collect(Collectors.toList());