Implementation of all methods from tasks and class CandidateValidator

src/main/java/practice/CandidateValidator.java

@@ -1,5 +1,22 @@
 package practice;
 
-public class CandidateValidator {
-    //write your code here
+import java.util.function.Predicate;
+import model.Candidate;
+
+public class CandidateValidator implements Predicate<Candidate> {
+    @Override
+    public boolean test(Candidate candidate) {
+        if (candidate == null) {
+            return false;
+        }
+
+        boolean oldEnough = candidate.getAge() >= 35;
+        boolean nationality = candidate.getNationality().equals("Ukrainian");
+        boolean canVote = candidate.isAllowedToVote();
+        String[] ages = candidate.getPeriodsInUkr().split("-");
+        boolean liveEnoughInUkraine = Integer.parseInt(ages[1])
+                - Integer.parseInt(ages[0]) >= 10;
+
+        return oldEnough && nationality && canVote && liveEnoughInUkraine;
+    }
 }

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 +18,13 @@ 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(s -> Arrays.stream(s.split(",")))
+                .map(Integer::parseInt)
+                .filter(n -> n % 2 == 0)
+                .min(Integer::compareTo)
+                .orElseThrow(() -> new RuntimeException("Can't get min value from list: "
+                        + numbers));
     }
 
     /**
@@ -23,7 +33,12 @@ 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())
+                .mapToObj(i -> i % 2 == 1 ? numbers.get(i) - 1 : numbers.get(i))
+                .filter(n -> n % 2 != 0)
+                .mapToDouble(n -> n)
+                .average()
+                .orElseThrow(() -> new NoSuchElementException("Can't find any odd numbers"));
     }
 
     /**
@@ -35,7 +50,10 @@ 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(m -> m.getSex() == Person.Sex.MAN)
+                .filter(m -> m.getAge() >= fromAge && m.getAge() <= toAge)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -50,7 +68,12 @@ 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.MAN && p.getAge() >= fromAge
+                        && p.getAge() <= maleToAge)
+                        || (p.getSex() == Person.Sex.WOMAN && p.getAge() >= fromAge
+                        && p.getAge() <= femaleToAge))
+                .collect(Collectors.toList());
     }
 
     /**
@@ -59,7 +82,11 @@ 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(w -> w.getSex() == Person.Sex.WOMAN && w.getAge() >= femaleAge)
+                .flatMap(w -> w.getCats().stream())
+                .map(Cat::getName)
+                .collect(Collectors.toList());
     }
 
     /**
@@ -75,6 +102,11 @@ 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()
+                .collect(Collectors.toList());
     }
 }