From 56e333bdadb8340e9fb51f11b49f493fe0c2d4b2 Mon Sep 17 00:00:00 2001 From: PatrykWski Date: Sat, 21 Mar 2026 17:56:43 +0100 Subject: [PATCH 1/5] Small changes --- .../java/practice/CandidateValidator.java | 26 ++++++++++- src/main/java/practice/StreamPractice.java | 45 ++++++++++++++++--- 2 files changed, 63 insertions(+), 8 deletions(-) diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java index 8d2e56c0e..6ad360326 100644 --- a/src/main/java/practice/CandidateValidator.java +++ b/src/main/java/practice/CandidateValidator.java @@ -1,5 +1,27 @@ 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 int MIMIMUM_AGE_TO_BE_PRESIDENT = 35; + private static final int MINIMUM_PERIOD_IN_UKRAINE = 10; + + @Override + public boolean test(Candidate candidate) { + if (candidate.getAge() < MIMIMUM_AGE_TO_BE_PRESIDENT) { + return false; + } + if (!"Ukrainian".equals(candidate.getNationality())) { + return false; + } + if (!candidate.isAllowedToVote()) { + return false; + } + String[] period = candidate.getPeriodsInUkr().split("-"); + String sinceWhen = period[0]; + String till = period[1]; + return (Integer.parseInt(till) - Integer.parseInt(sinceWhen) >= MINIMUM_PERIOD_IN_UKRAINE); + } } + diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 57b1ca2e2..3ed31b9d0 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -2,10 +2,16 @@ import java.util.Collections; import java.util.List; +import java.util.NoSuchElementException; +import java.util.Optional; +import java.util.stream.Collectors; +import java.util.stream.IntStream; import model.Candidate; +import model.Cat; import model.Person; public class StreamPractice { + /** * Given list of strings where each element contains 1+ numbers: * input = {"5,30,100", "0,22,7", ...} @@ -14,7 +20,11 @@ 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() + .map(Integer::valueOf) + .filter(number -> number % 2 == 0) + .min(Integer::compareTo) + .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(index -> index % 2 == 0 ? numbers.get(index) - 1 : numbers.get(index)) + .filter(value -> value % 2 != 0) + .average() + .orElseThrow(NoSuchElementException::new); } /** @@ -35,7 +49,11 @@ 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.getSex() == Person.Sex.MAN) + .filter(person -> person.getAge() >= fromAge) + .filter(person -> person.getAge() <= toAge) + .toList(); } /** @@ -50,7 +68,12 @@ 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.getAge() >= fromAge) + .filter(person -> person.getSex() == Person.Sex.WOMAN + ? person.getAge() <= femaleToAge + : person.getAge() <= maleToAge) + .toList(); } /** @@ -59,7 +82,12 @@ 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.getSex() == Person.Sex.WOMAN) + .filter(person -> person.getAge() >= femaleAge) + .flatMap(person -> person.getCats().stream()) + .map(Cat::getName) + .toList(); } /** @@ -75,6 +103,11 @@ 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) + .map(Candidate::getName) + .sorted() + .collect(Collectors.toList()); } } From c57e199fe08f10a54e7b3447cb58c05a73ed4066 Mon Sep 17 00:00:00 2001 From: PatrykWski Date: Sat, 21 Mar 2026 17:57:40 +0100 Subject: [PATCH 2/5] ok --- src/main/java/practice/StreamPractice.java | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 3ed31b9d0..8f361d9e7 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -1,9 +1,7 @@ package practice; -import java.util.Collections; import java.util.List; import java.util.NoSuchElementException; -import java.util.Optional; import java.util.stream.Collectors; import java.util.stream.IntStream; import model.Candidate; @@ -24,7 +22,8 @@ public int findMinEvenNumber(List numbers) { .map(Integer::valueOf) .filter(number -> number % 2 == 0) .min(Integer::compareTo) - .orElseThrow(() -> new RuntimeException("Can't get min value from list: " + numbers)); + .orElseThrow(() -> new RuntimeException + ("Can't get min value from list: " + numbers)); } /** From 8bbb1eb4cf96a14866c3519d2c7ff00679531ef4 Mon Sep 17 00:00:00 2001 From: PatrykWski Date: Sat, 21 Mar 2026 17:59:23 +0100 Subject: [PATCH 3/5] xd --- 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 8f361d9e7..cd3157089 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -22,8 +22,8 @@ public int findMinEvenNumber(List numbers) { .map(Integer::valueOf) .filter(number -> number % 2 == 0) .min(Integer::compareTo) - .orElseThrow(() -> new RuntimeException - ("Can't get min value from list: " + numbers)); + .orElseThrow(() -> + new RuntimeException("Can't get min value from list: " + numbers)); } /** From 204065396a26f2b667d3fdd5975d5b49893554eb Mon Sep 17 00:00:00 2001 From: PatrykWski Date: Sat, 21 Mar 2026 18:04:47 +0100 Subject: [PATCH 4/5] should work --- src/main/java/practice/StreamPractice.java | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index cd3157089..36329d40d 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -1,5 +1,6 @@ package practice; +import java.util.Arrays; import java.util.List; import java.util.NoSuchElementException; import java.util.stream.Collectors; @@ -19,6 +20,8 @@ public class StreamPractice { */ public int findMinEvenNumber(List numbers) { return numbers.stream() + .filter(number -> number.contains(",")) + .flatMap(number -> Arrays.stream(number.split(","))) .map(Integer::valueOf) .filter(number -> number % 2 == 0) .min(Integer::compareTo) @@ -33,7 +36,7 @@ public int findMinEvenNumber(List numbers) { */ public Double getOddNumsAverage(List numbers) { return IntStream.range(0, numbers.size()) - .map(index -> index % 2 == 0 ? numbers.get(index) - 1 : numbers.get(index)) + .map(index -> index % 2 != 0 ? numbers.get(index) - 1 : numbers.get(index)) .filter(value -> value % 2 != 0) .average() .orElseThrow(NoSuchElementException::new); From f7191348a9bf78eb22127dad08380417f7f23d52 Mon Sep 17 00:00:00 2001 From: PatrykWski Date: Sat, 21 Mar 2026 18:12:33 +0100 Subject: [PATCH 5/5] last changes --- src/main/java/practice/CandidateValidator.java | 3 ++- src/main/java/practice/StreamPractice.java | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java index 6ad360326..22d1dc660 100644 --- a/src/main/java/practice/CandidateValidator.java +++ b/src/main/java/practice/CandidateValidator.java @@ -6,13 +6,14 @@ public class CandidateValidator implements Predicate { private static final int MIMIMUM_AGE_TO_BE_PRESIDENT = 35; private static final int MINIMUM_PERIOD_IN_UKRAINE = 10; + private static final String NATIONALITY = "Ukrainian"; @Override public boolean test(Candidate candidate) { if (candidate.getAge() < MIMIMUM_AGE_TO_BE_PRESIDENT) { return false; } - if (!"Ukrainian".equals(candidate.getNationality())) { + if (!NATIONALITY.equals(candidate.getNationality())) { return false; } if (!candidate.isAllowedToVote()) { diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java index 36329d40d..331feba38 100644 --- a/src/main/java/practice/StreamPractice.java +++ b/src/main/java/practice/StreamPractice.java @@ -20,8 +20,8 @@ public class StreamPractice { */ public int findMinEvenNumber(List numbers) { return numbers.stream() - .filter(number -> number.contains(",")) .flatMap(number -> Arrays.stream(number.split(","))) + .map(String::trim) .map(Integer::valueOf) .filter(number -> number % 2 == 0) .min(Integer::compareTo)