completed all tasks

src/main/java/practice/CandidateValidator.java

@@ -1,5 +1,31 @@
 package practice;
 
-public class CandidateValidator {
-    //write your code here
+import java.util.function.Predicate;
+import model.Candidate;
+
+public class CandidateValidator implements Predicate<Candidate> {
+    private static final String NATIONALITY = "Ukrainian";
+    private static final int REQUIRED_YEARS_IN_UKRAINE = 10;
+    private static final int MIN_AGE = 35;
+
+    @Override
+    public boolean test(Candidate candidate) {
+        if (candidate.getAge() < MIN_AGE) {
+            return false;
+        }
+
+        if (!candidate.isAllowedToVote()) {
+            return false;
+        }
+
+        if (!NATIONALITY.equals(candidate.getNationality())) {
+            return false;
+        }
+
+        String[] years = candidate.getPeriodsInUkr().split("-");
+        int firstYear = Integer.parseInt(years[0]);
+        int lastYear = Integer.parseInt(years[1]);
+
+        return (lastYear - firstYear) >= REQUIRED_YEARS_IN_UKRAINE;
+    }
 }

src/main/java/practice/StreamPractice.java

@@ -1,8 +1,13 @@
 package practice;
 
-import java.util.Collections;
+import java.util.Arrays;
+import java.util.Collection;
 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 {
@@ -14,7 +19,16 @@ public class StreamPractice {
      * "Can't get min value from list: < Here is our input 'numbers' >"
      */
     public int findMinEvenNumber(List<String> numbers) {
-        return 0;
+
+        return numbers.stream()
+                .flatMap(s -> Arrays.stream(s.split(",")))
+                .map(String::trim)
+                .map(Integer::parseInt)
+                .filter(n -> n % 2 == 0)
+                .min(Integer::compareTo)
+                .orElseThrow(() -> new RuntimeException(
+                        "Can't get min value from list: " + numbers
+                ));
     }
 
     /**
@@ -23,9 +37,14 @@ public int findMinEvenNumber(List<String> numbers) {
      * But before that subtract 1 from each element on an odd position (having the odd index).
      */
     public Double getOddNumsAverage(List<Integer> numbers) {
-        return 0D;
+        return IntStream.range(0, numbers.size())
+                .map(i -> i % 2 != 0
+                        ? numbers.get(i) - 1
+                        : numbers.get(i))
+                .filter(n -> n % 2 != 0)
+                .average()
+                .orElseThrow(NoSuchElementException::new);
     }
-
     /**
      * Given a List of `Person` instances (having `name`, `age` and `sex` fields),
      * for example, `Arrays.asList( new Person(«Victor», 16, Sex.MAN),
@@ -34,8 +53,12 @@ public Double getOddNumsAverage(List<Integer> numbers) {
      * <p>
      * Example: select men who can be recruited to army (from 18 to 27 years old inclusively).
      */
+
     public List<Person> selectMenByAge(List<Person> peopleList, int fromAge, int toAge) {
-        return Collections.emptyList();
+        return peopleList.stream()
+                .filter(p -> p.getSex() == Person.Sex.MAN)
+                .filter(person -> person.getAge() >= fromAge && person.getAge() <= toAge)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -50,7 +73,13 @@ public List<Person> selectMenByAge(List<Person> peopleList, int fromAge, int toA
      */
     public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
                                           int maleToAge, List<Person> peopleList) {
-        return Collections.emptyList();
+        return peopleList.stream()
+                .filter(p -> (p.getSex() == Person.Sex.WOMAN
+                        && p.getAge() >= fromAge
+                        && p.getAge() <= femaleToAge)
+                        || (p.getSex() == Person.Sex.MAN
+                        && p.getAge() >= fromAge && p.getAge() <= maleToAge))
+                .collect(Collectors.toList());
     }
 
     /**
@@ -59,7 +88,13 @@ public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
      * return the names of all cats whose owners are women from `femaleAge` years old inclusively.
      */
     public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
-        return Collections.emptyList();
+        return peopleList.stream()
+                .filter(person -> person.getSex() == Person.Sex.WOMAN
+                        && person.getAge() >= femaleAge)
+                .map(Person::getCats)
+                .flatMap(Collection::stream)
+                .map(Cat::getName)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -75,6 +110,11 @@ public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
      * parametrized with Candidate in CandidateValidator.
      */
     public List<String> validateCandidates(List<Candidate> candidates) {
-        return Collections.emptyList();
+
+        return candidates.stream()
+                .filter(new CandidateValidator())
+                .map(Candidate::getName)
+                .sorted()
+                .toList();
     }
 }