From 2d0550a1277c5f3e9276e42ed27eedf5c197e0f6 Mon Sep 17 00:00:00 2001
From: FroGitHub <andrey8102310@gmail.com>
Date: Fri, 17 Jan 2025 19:03:37 +0200
Subject: [PATCH] correcting my code

---
 .../java/practice/CandidateValidator.java     |  9 ++++++---
 src/main/java/practice/StreamPractice.java    | 20 ++++++++++++++++++-
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index 31e161d0..683be9f5 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -7,15 +7,18 @@
 import model.Candidate;
 
 public class CandidateValidator implements Predicate<Candidate> {
+    private static final int neededAge = 35;
+    private static final int neededPeriod = 10;
+
     @Override
     public boolean test(Candidate candidate) {
         if (candidate == null) {
             return false;
         }
-        if (!"Ukrainian".equals(candidate.getNationality())) {
+        if (!candidate.getNationality().equals("Ukrainian")) {
             return false;
         }
-        if (candidate.getAge() < 35) {
+        if (candidate.getAge() < neededAge) {
             return false;
         }
         if (!candidate.isAllowedToVote()) {
@@ -27,7 +30,7 @@ public boolean test(Candidate candidate) {
                     .map(Integer::valueOf)
                     .collect(Collectors.toList());
             if (periodInUkraine.size() != 2
-                    || periodInUkraine.get(1) - periodInUkraine.get(0) < 10) {
+                    || periodInUkraine.get(1) - periodInUkraine.get(0) < neededPeriod) {
                 return false;
             }
         } catch (NumberFormatException | IndexOutOfBoundsException e) {
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 528e6e32..555520d0 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -1,6 +1,7 @@
 package practice;
 
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.stream.Collectors;
@@ -18,6 +19,9 @@ public class StreamPractice {
      * "Can't get min value from list: < Here is our input 'numbers' >"
      */
     public int findMinEvenNumber(List<String> numbers) {
+        if (numbers == null || numbers.isEmpty()) {
+            throw new RuntimeException("Can't get min value from list");
+        }
         return numbers.stream()
                 .map(s -> s.split(","))
                 .flatMap(Arrays::stream)
@@ -36,7 +40,9 @@ 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) {
-
+        if (numbers == null || numbers.isEmpty()) {
+            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)
@@ -53,6 +59,9 @@ 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) {
+        if (peopleList == null || peopleList.isEmpty()) {
+            return Collections.emptyList();
+        }
         return peopleList.stream()
                 .filter(p -> p.getAge() >= fromAge && p.getAge() <= toAge)
                 .filter(p -> p.getSex() == Person.Sex.MAN)
@@ -71,6 +80,9 @@ public List<Person> selectMenByAge(List<Person> peopleList, int fromAge, int toA
      */
     public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
                                           int maleToAge, List<Person> peopleList) {
+        if (peopleList == null || peopleList.isEmpty()) {
+            return Collections.emptyList();
+        }
         return peopleList.stream()
                 .filter(p -> p.getAge() >= fromAge)
                 .filter((p -> (p.getSex() == Person.Sex.WOMAN && p.getAge() <= femaleToAge)
@@ -84,6 +96,9 @@ 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) {
+        if (peopleList == null || peopleList.isEmpty()) {
+            return Collections.emptyList();
+        }
         return peopleList.stream()
                 .filter(p -> p.getSex() == Person.Sex.WOMAN)
                 .filter(p -> p.getAge() >= femaleAge)
@@ -105,6 +120,9 @@ public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
      * parametrized with Candidate in CandidateValidator.
      */
     public List<String> validateCandidates(List<Candidate> candidates) {
+        if (candidates == null || candidates.isEmpty()) {
+            return Collections.emptyList();
+        }
         return candidates.stream()
                 .filter(new CandidateValidator())
                 .map(Candidate::getName)