implement all methods

src/main/java/practice/CandidateValidator.java

@@ -1,5 +1,39 @@
 package practice;
 
-public class CandidateValidator {
-    //write your code here
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import model.Candidate;
+
+public class CandidateValidator implements Predicate<Candidate> {
+    @Override
+    public boolean test(Candidate candidate) {
+        if (candidate == null) {
+            return false;
+        }
+        if (!"Ukrainian".equals(candidate.getNationality())) {
+            return false;
+        }
+        if (candidate.getAge() < 35) {
+            return false;
+        }
+        if (!candidate.isAllowedToVote()) {
+            return false;
+        }
+        try {
+            List<Integer> periodInUkraine = Arrays.stream(candidate.getPeriodsInUkr().split("-"))
+                    .map(String::trim)
+                    .map(Integer::valueOf)
+                    .collect(Collectors.toList());
+            if (periodInUkraine.size() != 2
+                    || periodInUkraine.get(1) - periodInUkraine.get(0) < 10) {
+                return false;
+            }
+        } catch (NumberFormatException | IndexOutOfBoundsException e) {
+            return false;
+        }
+        return true;
+    }
 }
+

src/main/java/practice/StreamPractice.java

@@ -1,8 +1,12 @@
 package practice;
 
-import java.util.Collections;
+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;
+import model.Cat;
 import model.Person;
 
 public class StreamPractice {
@@ -14,7 +18,16 @@ 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()
+                .map(s -> s.split(","))
+                .flatMap(Arrays::stream)
+                .map(String::trim)
+                .map(Integer::valueOf)
+                .filter(i -> i % 2 == 0)
+                .min(Integer::compareTo)
+                .orElseThrow(() -> new RuntimeException(
+                        "Can't get min value from list: " + numbers
+                ));
     }
 
     /**
@@ -23,7 +36,12 @@ 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 == 1 ? numbers.get(i) - 1 : numbers.get(i))
+                .filter(num -> num % 2 != 0)
+                .average()
+                .orElseThrow(NoSuchElementException::new);
     }
 
     /**
@@ -35,7 +53,10 @@ 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(p -> p.getAge() >= fromAge && p.getAge() <= toAge)
+                .filter(p -> p.getSex() == Person.Sex.MAN)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -50,7 +71,11 @@ 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(p -> p.getAge() >= fromAge)
+                .filter((p -> (p.getSex() == Person.Sex.WOMAN && p.getAge() <= femaleToAge)
+                    || (p.getSex() == Person.Sex.MAN && p.getAge() <= maleToAge)))
+                .collect(Collectors.toList());
     }
 
     /**
@@ -59,10 +84,15 @@ 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(p -> p.getSex() == Person.Sex.WOMAN)
+                .filter(p -> p.getAge() >= femaleAge)
+                .flatMap(c -> c.getCats().stream())
+                .map(Cat::getName)
+                .collect(Collectors.toList());
     }
 
-    /**
+    /**               V - wtf MA, wrong article
      * Your help with a election is needed. Given list of candidates, where each element
      * has Candidate.class type.
      * Check which candidates are eligible to apply for president position and return their
@@ -75,6 +105,10 @@ 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()
+                .collect(Collectors.toList());
     }
 }