Candidate validator created and stream practice assingments done

src/main/java/practice/CandidateValidator.java

@@ -1,5 +1,30 @@
 package practice;
 
-public class CandidateValidator {
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+import model.Candidate;
+
+public class CandidateValidator implements Predicate<Candidate> {
+    private static final String REQUIRED_NATIONALITY = "Ukrainian";
+    private static final String HYPHEN = "-";
+    private static final int MIN_CANDIDATE_AGE = 35;
+    private static final int MIN_YEARS_IN_UKRAINE = 10;
+
     //write your code here
+    @Override
+    public boolean test(Candidate candidate) {
+        if (candidate == null) {
+            return false;
+        }
+
+        int yearsInUkraine = Stream.of(candidate.getPeriodsInUkr())
+                .map(period -> period.split(HYPHEN))
+                .mapToInt(arr -> Integer.parseInt(arr[1]) - Integer.parseInt(arr[0]))
+                .sum();
+
+        return candidate.getAge() >= MIN_CANDIDATE_AGE
+                && candidate.isAllowedToVote()
+                && REQUIRED_NATIONALITY.equals(candidate.getNationality())
+                && yearsInUkraine >= MIN_YEARS_IN_UKRAINE;
+    }
 }

src/main/java/practice/StreamPractice.java

@@ -1,11 +1,16 @@
 package practice;
 
-import java.util.Collections;
+import java.util.Arrays;
 import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.stream.IntStream;
 import model.Candidate;
+import model.Cat;
 import model.Person;
 
 public class StreamPractice {
+    private static final String COMMA = ",";
+
     /**
      * Given list of strings where each element contains 1+ numbers:
      * input = {"5,30,100", "0,22,7", ...}
@@ -14,7 +19,13 @@ 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(n -> Arrays.stream(n.split(COMMA)))
+                .map(num -> Integer.valueOf(num.trim()))
+                .filter(num -> num % 2 == 0)
+                .min(Integer::compareTo)
+                .orElseThrow(() -> 
+                        new RuntimeException("Can't get min value from list: " + numbers));
     }
 
     /**
@@ -23,7 +34,11 @@ 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);
     }
 
     /**
@@ -35,7 +50,11 @@ public Double getOddNumsAverage(List<Integer> numbers) {
      * 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(person -> person.getAge() >= fromAge 
+                        && person.getAge() <= toAge 
+                        && person.getSex().equals(Person.Sex.MAN))
+                .toList();
     }
 
     /**
@@ -50,7 +69,11 @@ 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(person -> person.getSex().equals(Person.Sex.MAN) 
+                        ? person.getAge() >= fromAge && person.getAge() <= maleToAge
+                        : person.getAge() >= fromAge && person.getAge() <= femaleToAge)
+                .toList();
     }
 
     /**
@@ -59,7 +82,13 @@ 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().equals(Person.Sex.WOMAN) 
+                        && person.getAge() >= femaleAge)
+                .flatMap(person -> person.getCats().stream())
+                .map(Cat::getName)
+                .toList();
+
     }
 
     /**
@@ -75,6 +104,11 @@ public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
      * parametrized with Candidate in CandidateValidator.
      */
     public List<String> validateCandidates(List<Candidate> candidates) {
-        return Collections.emptyList();
+        CandidateValidator candidateValidator = new CandidateValidator();
+        return candidates.stream()
+                .filter(candidateValidator)
+                .map(Candidate::getName)
+                .sorted()
+                .toList();
     }
 }