Practice Completed

src/main/java/practice/CandidateValidator.java

@@ -1,5 +1,23 @@
 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 int MINIMUM_AGE = 35;
+    private static final int MIN_YEARS_IN_UKRAINE = 10;
+    private static final String REQUIRED_NATIONALITY = "Ukrainian";
+    private static final String SEPARATOR = "-";
+
+    @Override
+    public boolean test(Candidate candidate) {
+        int startYear = Integer.parseInt(candidate.getPeriodsInUkr().split(SEPARATOR)[0]);
+        int endYear = Integer.parseInt(candidate.getPeriodsInUkr().split(SEPARATOR)[1]);
+        int yearsInUkraine = endYear - startYear;
+
+        return candidate.isAllowedToVote()
+                && candidate.getNationality().equals(REQUIRED_NATIONALITY)
+                && candidate.getAge() >= MINIMUM_AGE
+                && yearsInUkraine >= MIN_YEARS_IN_UKRAINE;
+    }
 }

src/main/java/practice/StreamPractice.java

@@ -1,11 +1,17 @@
 package practice;
 
-import java.util.Collections;
+import java.util.Arrays;
 import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.function.Predicate;
+import java.util.stream.IntStream;
 import model.Candidate;
+import model.Cat;
 import model.Person;
 
 public class StreamPractice {
+    public static final CandidateValidator validator = new CandidateValidator();
+
     /**
      * Given list of strings where each element contains 1+ numbers:
      * input = {"5,30,100", "0,22,7", ...}
@@ -14,7 +20,17 @@ public class StreamPractice {
      * "Can't get min value from list: < Here is our input 'numbers' >"
      */
     public int findMinEvenNumber(List<String> numbers) {
-        return 0;
+        final String errorMessage = "Can't get min value from list: " + numbers;
+
+        if (numbers.isEmpty()) {
+            throw new RuntimeException(errorMessage);
+        }
+        return Arrays.stream(String.join(",", numbers)
+                        .split(","))
+                        .map(Integer::parseInt)
+                        .filter(i -> i % 2 == 0)
+                        .min(Integer::compareTo)
+                        .orElseThrow(() -> new RuntimeException(errorMessage));
     }
 
     /**
@@ -23,7 +39,12 @@ 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 != 0 ? numbers.get(i) - 1 : numbers.get(i))
+                .filter(n -> n % 2 != 0)
+                .average()
+                .orElseThrow(() ->
+                        new NoSuchElementException("No odd number found in list"));
     }
 
     /**
@@ -35,7 +56,13 @@ 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();
+        Predicate<Person> manByAgePredicate = p -> p.getSex() == Person.Sex.MAN
+                && p.getAge() >= fromAge
+                && p.getAge() <= toAge;
+
+        return peopleList.stream()
+                .filter(manByAgePredicate)
+                .toList();
     }
 
     /**
@@ -50,7 +77,16 @@ 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();
+        Predicate<Person> workablePredicate = p ->
+                (p.getSex() == Person.Sex.WOMAN
+                && p.getAge() <= femaleToAge)
+                || (p.getSex() == Person.Sex.MAN
+                && p.getAge() <= maleToAge);
+
+        return peopleList.stream()
+                .filter(p -> p.getAge() >= fromAge)
+                .filter(workablePredicate)
+                .toList();
     }
 
     /**
@@ -59,7 +95,13 @@ 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(p -> p.getSex() == Person.Sex.WOMAN
+                        && p.getAge() >= femaleAge
+                        && !p.getCats().isEmpty())
+                .flatMap(p -> p.getCats().stream())
+                .map(Cat::getName)
+                .toList();
     }
 
     /**
@@ -75,6 +117,10 @@ 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(validator)
+                .map(Candidate::getName)
+                .sorted()
+                .toList();
     }
 }