resolve

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> {
+    private static final int MIN_AGE = 35;
+    private static final int MIN_YEARS_IN_UKRAINE = 10;
+    private static final String NATIONALITY = "Ukrainian";
+    private static final int FROM_YEAR_INDEX = 0;
+    private static final int TO_YEAR_INDEX = 1;
+    private static final String LINE_SEPARATOR = "-";
+
+    public boolean test (Candidate candidate) {
+        String[] period = candidate.getPeriodsInUkr().split(LINE_SEPARATOR);
+        int yearsInUkraine = Integer.parseInt(period[TO_YEAR_INDEX])
+                - Integer.parseInt(period[FROM_YEAR_INDEX]);
+        return candidate.getAge() >= MIN_AGE && candidate.isAllowedToVote()
+                && candidate.getNationality().equals(NATIONALITY)
+                && 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 {
+    private final CandidateValidator candidateValidator = new CandidateValidator();
     /**
      * Given list of strings where each element contains 1+ numbers:
      * input = {"5,30,100", "0,22,7", ...}
@@ -14,16 +20,26 @@ 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(str -> Arrays.stream(str.split(",")))
+                .map(Integer::parseInt)
+                .filter(n -> n % 2 == 0)
+                .mapToInt(n -> n)
+                .min()
+                .orElseThrow(() -> new RuntimeException("Can`t get min value from list: " + numbers));
     }
-
     /**
      * Given a List of Integer numbers,
      * return the average of all odd numbers from the list or throw NoSuchElementException.
      * 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(num -> num % 2 != 0)
+                        .average()
+                        .orElseThrow(() -> new NoSuchElementException("Can`t get average value from list : "
+                                + numbers));
     }
 
     /**
@@ -35,7 +51,11 @@ 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();
+        Predicate<Person> manFromAgeToAge = p -> p.getSex() == Person.Sex.MAN && p.getAge() >= fromAge
+                                                                                     && p.getAge() <= toAge;
+        return peopleList.stream()
+                         .filter(manFromAgeToAge)
+                         .toList();
     }
 
     /**
@@ -50,7 +70,12 @@ 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();
+        Predicate<Person> workablePerson = p -> p.getSex() == Person.Sex.MAN && p.getAge() >= fromAge
+                && p.getAge() <= maleToAge || (p.getSex().equals(Person.Sex.WOMAN) && p.getAge() >= fromAge
+                && p.getAge() <= femaleToAge);
+        return peopleList.stream()
+                         .filter(workablePerson)
+                         .toList();
     }
 
     /**
@@ -59,7 +84,11 @@ 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(p -> p.getSex() == Person.Sex.WOMAN && p.getAge() >= femaleAge)
+                         .flatMap(p -> p.getCats().stream())
+                         .map(Cat::getName)
+                         .toList();
     }
 
     /**
@@ -75,6 +104,10 @@ 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(candidateValidator)
+                         .map(Candidate::getName)
+                         .sorted()
+                         .toList();
     }
 }