From 28a96feb0192e5e7bddc55d84f2ab9bf4bdc64e8 Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Wed, 13 May 2026 10:12:03 +0200
Subject: [PATCH 1/8] first solution

---
 src/main/java/practice/StreamPractice.java | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 57b1ca2e2..c4f09f810 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -1,7 +1,12 @@
 package practice;
 
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.function.IntToDoubleFunction;
+import java.util.stream.IntStream;
+
 import model.Candidate;
 import model.Person;
 
@@ -14,7 +19,14 @@ 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(n -> Arrays.stream(n.split(",")))
+                .map(String::trim)
+                .map(Integer::parseInt)
+                .filter(n-> n % 2 ==0)
+                .min(Integer::compare)
+                .orElseThrow(() - > new RuntimeException(
+                        "Cant't get min value from list: " + numbers));
     }
 
     /**
@@ -23,7 +35,11 @@ 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 numbers.stream()
+                .mapToInt(Integer::intValue)
+                .filter(n -> n % 2 != 0)
+                .average()
+                .orElseThrow(() -> new NoSuchElementException("No odd numbers in the list: " + numbers));
     }
 
     /**

From ad1d9015de3813783637ef04ab16513badc63d20 Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Wed, 13 May 2026 22:32:57 +0200
Subject: [PATCH 2/8] firstSolution

---
 .../java/practice/CandidateValidator.java     | 14 +++++++-
 src/main/java/practice/StreamPractice.java    | 32 +++++++++++++------
 2 files changed, 36 insertions(+), 10 deletions(-)

diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index 8d2e56c0e..a1dca7b06 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -1,5 +1,17 @@
 package practice;
 
+import model.Candidate;
+import java.util.function.Predicate;
+
 public class CandidateValidator {
-    //write your code here
+    public static final int fromAge = 35;
+    public static final String livePeriod = "2002-2015";
+    public static final String nationality = "Ukrainian";
+
+    public static Predicate<Candidate> isValid() {
+        return candidate -> candidate.getAge() >= fromAge
+                && candidate.isAllowedToVote()
+                && nationality.equals(candidate.getNationality())
+                && livePeriod.equals(candidate.getPeriodsInUkr());
+    }
 }
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index c4f09f810..ad7602734 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -1,16 +1,14 @@
 package practice;
 
 import java.util.Arrays;
-import java.util.Collections;
 import java.util.List;
 import java.util.NoSuchElementException;
-import java.util.function.IntToDoubleFunction;
-import java.util.stream.IntStream;
-
 import model.Candidate;
+import model.Cat;
 import model.Person;
 
 public class StreamPractice {
+
     /**
      * Given list of strings where each element contains 1+ numbers:
      * input = {"5,30,100", "0,22,7", ...}
@@ -25,7 +23,7 @@ public int findMinEvenNumber(List<String> numbers) {
                 .map(Integer::parseInt)
                 .filter(n-> n % 2 ==0)
                 .min(Integer::compare)
-                .orElseThrow(() - > new RuntimeException(
+                .orElseThrow(() -> new RuntimeException(
                         "Cant't get min value from list: " + numbers));
     }
 
@@ -51,7 +49,10 @@ 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.getSex() == Person.Sex.MAN
+                && (p.getAge() >= fromAge && p.getAge() <= toAge))
+                .toList();
     }
 
     /**
@@ -66,7 +67,12 @@ 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)))
+                .toList();
     }
 
     /**
@@ -75,7 +81,11 @@ 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();
     }
 
     /**
@@ -91,6 +101,10 @@ 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.isValid())
+                .map(Candidate::getName)
+                .sorted()
+                .toList();
     }
 }

From 807e2c43865052b7692bd3504acede2f8a8380a7 Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Wed, 13 May 2026 22:37:58 +0200
Subject: [PATCH 3/8] checkstyle fixes

---
 src/main/java/practice/CandidateValidator.java | 2 +-
 src/main/java/practice/StreamPractice.java     | 9 +++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index a1dca7b06..b389d0821 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -1,7 +1,7 @@
 package practice;
 
-import model.Candidate;
 import java.util.function.Predicate;
+import model.Candidate;
 
 public class CandidateValidator {
     public static final int fromAge = 35;
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index ad7602734..3b62a70bd 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -21,7 +21,7 @@ public int findMinEvenNumber(List<String> numbers) {
                 .flatMap(n -> Arrays.stream(n.split(",")))
                 .map(String::trim)
                 .map(Integer::parseInt)
-                .filter(n-> n % 2 ==0)
+                .filter(n -> n % 2 == 0)
                 .min(Integer::compare)
                 .orElseThrow(() -> new RuntimeException(
                         "Cant't get min value from list: " + numbers));
@@ -37,7 +37,8 @@ public Double getOddNumsAverage(List<Integer> numbers) {
                 .mapToInt(Integer::intValue)
                 .filter(n -> n % 2 != 0)
                 .average()
-                .orElseThrow(() -> new NoSuchElementException("No odd numbers in the list: " + numbers));
+                .orElseThrow(() -> new NoSuchElementException(
+                        "No odd numbers in the list: " + numbers));
     }
 
     /**
@@ -70,8 +71,8 @@ public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
         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)))
+                        || (p.getSex() == Person.Sex.WOMAN
+                        && (p.getAge() >= fromAge && p.getAge() <= femaleToAge)))
                 .toList();
     }
 

From 7749fcc9458da04009b74ec8b0c54dce8cdff6eb Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Wed, 13 May 2026 22:48:15 +0200
Subject: [PATCH 4/8] after fixes

---
 src/main/java/practice/CandidateValidator.java | 1 +
 src/main/java/practice/StreamPractice.java     | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index b389d0821..c7b9c0b4a 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -8,6 +8,7 @@ public class CandidateValidator {
     public static final String livePeriod = "2002-2015";
     public static final String nationality = "Ukrainian";
 
+    @Override
     public static Predicate<Candidate> isValid() {
         return candidate -> candidate.getAge() >= fromAge
                 && candidate.isAllowedToVote()
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 3b62a70bd..35970ab8a 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -3,6 +3,8 @@
 import java.util.Arrays;
 import java.util.List;
 import java.util.NoSuchElementException;
+import java.util.stream.IntStream;
+
 import model.Candidate;
 import model.Cat;
 import model.Person;
@@ -33,8 +35,8 @@ 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 numbers.stream()
-                .mapToInt(Integer::intValue)
+        return IntStream.range(0, numbers.size())
+                .map(i -> i % 2 == 1 ? numbers.get(i) - 1 : numbers.get(i))
                 .filter(n -> n % 2 != 0)
                 .average()
                 .orElseThrow(() -> new NoSuchElementException(

From a47d389118519f75f853a088d66e122a5fb29b79 Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Wed, 13 May 2026 22:50:18 +0200
Subject: [PATCH 5/8] override remove

---
 src/main/java/practice/CandidateValidator.java | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index c7b9c0b4a..b389d0821 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -8,7 +8,6 @@ public class CandidateValidator {
     public static final String livePeriod = "2002-2015";
     public static final String nationality = "Ukrainian";
 
-    @Override
     public static Predicate<Candidate> isValid() {
         return candidate -> candidate.getAge() >= fromAge
                 && candidate.isAllowedToVote()

From 671ceb8cc5a2c26ea56155227b3a540700187027 Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Wed, 13 May 2026 22:52:16 +0200
Subject: [PATCH 6/8] empty line remove

---
 src/main/java/practice/StreamPractice.java | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 35970ab8a..97a568510 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -4,7 +4,6 @@
 import java.util.List;
 import java.util.NoSuchElementException;
 import java.util.stream.IntStream;
-
 import model.Candidate;
 import model.Cat;
 import model.Person;

From b6fb94c21370db4565145ceaab63b1fa77066190 Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Thu, 14 May 2026 10:17:49 +0200
Subject: [PATCH 7/8] fixes equals, added method periodInUkrConvertedToYears in
 class CandidateValidator

---
 config/checkstyle.xml                         | 250 ++++++++++++++++++
 pom.xml                                       |   2 +-
 .../java/practice/CandidateValidator.java     |  21 +-
 src/main/java/practice/StreamPractice.java    |  10 +-
 4 files changed, 272 insertions(+), 11 deletions(-)
 create mode 100644 config/checkstyle.xml

diff --git a/config/checkstyle.xml b/config/checkstyle.xml
new file mode 100644
index 000000000..ea0a5295c
--- /dev/null
+++ b/config/checkstyle.xml
@@ -0,0 +1,250 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+        "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
+        "https://checkstyle.org/dtds/configuration_1_3.dtd">
+
+<!--
+    Checkstyle configuration that checks the Google coding conventions from Google Java Style
+    that can be found at https://google.github.io/styleguide/javaguide.html.
+
+    Checkstyle is very configurable. Be sure to read the documentation at
+    http://checkstyle.sf.net (or in your downloaded distribution).
+
+    To completely disable a check, just comment it out or delete it from the file.
+
+    Authors: Max Vetrenko, Ruslan Diachenko, Roman Ivanov.
+ -->
+
+<module name="Checker">
+    <property name="charset" value="UTF-8"/>
+
+    <property name="severity" value="error"/>
+
+    <property name="fileExtensions" value="java, properties, xml"/>
+    <!-- Checks for whitespace                               -->
+    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
+    <module name="FileTabCharacter">
+        <property name="eachLine" value="true"/>
+    </module>
+    <module name="NewlineAtEndOfFile">
+        <property name="fileExtensions" value="java, properties, xml"/>
+    </module>
+    <module name="LineLength">
+        <property name="max" value="100"/>
+        <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+    </module>
+    <module name="TreeWalker">
+        <module name="OuterTypeFilename"/>
+        <module name="IllegalTokenText">
+            <property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>
+            <property name="format"
+                      value="\\u00(09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)"/>
+            <property name="message"
+                      value="Consider using special escape sequence instead of octal value or Unicode escaped value."/>
+        </module>
+        <module name="AvoidEscapedUnicodeCharacters">
+            <property name="allowEscapesForControlCharacters" value="true"/>
+            <property name="allowByTailComment" value="true"/>
+            <property name="allowNonPrintableEscapes" value="true"/>
+        </module>
+        <module name="AvoidStarImport"/>
+        <module name="IllegalImport"/>
+        <module name="RedundantImport"/>
+        <module name="UnusedImports"/>
+        <module name="OneTopLevelClass"/>
+        <module name="NoLineWrap"/>
+        <module name="EmptyBlock">
+            <property name="option" value="TEXT"/>
+            <property name="tokens"
+                      value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
+        </module>
+        <module name="NeedBraces"/>
+        <module name="LeftCurly"/>
+        <module name="RightCurly">
+            <property name="id" value="RightCurlySame"/>
+            <property name="tokens"
+                      value="LITERAL_TRY, LITERAL_CATCH, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE,
+                    LITERAL_DO"/>
+        </module>
+        <module name="RightCurly">
+            <property name="id" value="RightCurlyAlone"/>
+            <property name="option" value="alone"/>
+            <property name="tokens"
+                      value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT,
+                    INSTANCE_INIT"/>
+        </module>
+        <module name="WhitespaceAround">
+            <property name="allowEmptyConstructors" value="true"/>
+            <property name="allowEmptyLambdas" value="true"/>
+            <property name="allowEmptyMethods" value="true"/>
+            <property name="allowEmptyTypes" value="true"/>
+            <property name="allowEmptyLoops" value="true"/>
+            <message key="ws.notFollowed"
+                     value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks may only be represented as '{}' when not part of a multi-block statement (4.1.3)"/>
+            <message key="ws.notPreceded"
+                     value="WhitespaceAround: ''{0}'' is not preceded with whitespace."/>
+        </module>
+        <module name="OneStatementPerLine"/>
+        <module name="MultipleVariableDeclarations"/>
+        <module name="ArrayTypeStyle"/>
+        <module name="MissingSwitchDefault"/>
+        <module name="FallThrough"/>
+        <module name="VisibilityModifier">
+            <property name="protectedAllowed" value="true"/>
+        </module>
+        <module name="UpperEll"/>
+        <module name="ModifierOrder"/>
+        <module name="EmptyLineSeparator">
+            <property name="allowNoEmptyLineBetweenFields" value="true"/>
+            <property name="allowMultipleEmptyLines" value="false"/>
+            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
+        </module>
+        <module name="SeparatorWrap">
+            <property name="id" value="SeparatorWrapDot"/>
+            <property name="tokens" value="DOT"/>
+            <property name="option" value="nl"/>
+        </module>
+        <module name="SeparatorWrap">
+            <property name="id" value="SeparatorWrapComma"/>
+            <property name="tokens" value="COMMA"/>
+            <property name="option" value="EOL"/>
+        </module>
+        <module name="SeparatorWrap">
+            <!-- ELLIPSIS is EOL until https://github.com/google/styleguide/issues/258 -->
+            <property name="id" value="SeparatorWrapEllipsis"/>
+            <property name="tokens" value="ELLIPSIS"/>
+            <property name="option" value="EOL"/>
+        </module>
+        <module name="SeparatorWrap">
+            <!-- ARRAY_DECLARATOR is EOL until https://github.com/google/styleguide/issues/259 -->
+            <property name="id" value="SeparatorWrapArrayDeclarator"/>
+            <property name="tokens" value="ARRAY_DECLARATOR"/>
+            <property name="option" value="EOL"/>
+        </module>
+        <module name="SeparatorWrap">
+            <property name="id" value="SeparatorWrapMethodRef"/>
+            <property name="tokens" value="METHOD_REF"/>
+            <property name="option" value="nl"/>
+        </module>
+        <module name="PackageName">
+            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
+            <message key="name.invalidPattern"
+                     value="Package name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="TypeName">
+            <message key="name.invalidPattern"
+                     value="Type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="MemberName">
+            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
+            <message key="name.invalidPattern"
+                     value="Member name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="ParameterName">
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="LambdaParameterName">
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Lambda parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="CatchParameterName">
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="LocalVariableName">
+            <property name="tokens" value="VARIABLE_DEF"/>
+            <property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
+            <message key="name.invalidPattern"
+                     value="Local variable name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="ClassTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Class type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="MethodTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Method type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="InterfaceTypeParameterName">
+            <property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
+            <message key="name.invalidPattern"
+                     value="Interface type name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="NoFinalizer"/>
+        <module name="GenericWhitespace">
+            <message key="ws.followed"
+                     value="GenericWhitespace ''{0}'' is followed by whitespace."/>
+            <message key="ws.preceded"
+                     value="GenericWhitespace ''{0}'' is preceded with whitespace."/>
+            <message key="ws.illegalFollow"
+                     value="GenericWhitespace ''{0}'' should followed by whitespace."/>
+            <message key="ws.notPreceded"
+                     value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
+        </module>
+        <module name="Indentation">
+            <property name="basicOffset" value="4"/>
+            <property name="braceAdjustment" value="0"/>
+            <property name="caseIndent" value="4"/>
+            <property name="throwsIndent" value="8"/>
+            <property name="lineWrappingIndentation" value="8"/>
+            <property name="arrayInitIndent" value="4"/>
+        </module>
+        <module name="AbbreviationAsWordInName">
+            <property name="ignoreFinal" value="false"/>
+            <property name="allowedAbbreviationLength" value="1"/>
+        </module>
+        <module name="OverloadMethodsDeclarationOrder"/>
+        <module name="VariableDeclarationUsageDistance"/>
+        <module name="CustomImportOrder">
+            <property name="sortImportsInGroupAlphabetically" value="true"/>
+            <property name="separateLineBetweenGroups" value="true"/>
+            <property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
+        </module>
+        <module name="MethodParamPad"/>
+        <module name="NoWhitespaceBefore">
+            <property name="tokens"
+                      value="COMMA, SEMI, POST_INC, POST_DEC, DOT, ELLIPSIS, METHOD_REF"/>
+            <property name="allowLineBreaks" value="true"/>
+        </module>
+        <module name="ParenPad"/>
+        <module name="OperatorWrap">
+            <property name="option" value="NL"/>
+            <property name="tokens"
+                      value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR,
+                    LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR, METHOD_REF "/>
+        </module>
+        <module name="AnnotationLocation">
+            <property name="id" value="AnnotationLocationMostCases"/>
+            <property name="tokens"
+                      value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF"/>
+        </module>
+        <module name="AnnotationLocation">
+            <property name="id" value="AnnotationLocationVariables"/>
+            <property name="tokens" value="VARIABLE_DEF"/>
+            <property name="allowSamelineMultipleAnnotations" value="true"/>
+        </module>
+        <module name="NonEmptyAtclauseDescription"/>
+        <module name="MethodName">
+            <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>
+            <message key="name.invalidPattern"
+                     value="Method name ''{0}'' must match pattern ''{1}''."/>
+        </module>
+        <module name="SingleLineJavadoc">
+            <property name="ignoreInlineTags" value="false"/>
+        </module>
+        <module name="EmptyCatchBlock">
+            <property name="exceptionVariableName" value="expected"/>
+        </module>
+        <module name="CommentsIndentation"/>
+        <module name="DeclarationOrder"/>
+        <module name="SingleSpaceSeparator">
+            <property name="validateComments" value="true"/>
+        </module>
+    </module>
+</module>
diff --git a/pom.xml b/pom.xml
index 398a873c1..01702da99 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,7 +40,7 @@
                     </execution>
                 </executions>
                 <configuration>
-                    <configLocation>${maven.checkstyle.plugin.configLocation}</configLocation>
+                    <configLocation>config/checkstyle.xml</configLocation>
                     <consoleOutput>true</consoleOutput>
                     <failsOnError>true</failsOnError>
                     <linkXRef>false</linkXRef>
diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index b389d0821..685b04ad1 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -3,15 +3,26 @@
 import java.util.function.Predicate;
 import model.Candidate;
 
-public class CandidateValidator {
+public class CandidateValidator implements Predicate<Candidate> {
     public static final int fromAge = 35;
-    public static final String livePeriod = "2002-2015";
     public static final String nationality = "Ukrainian";
+    public static final int MIN_LIVE_PERIOD = 10;
 
-    public static Predicate<Candidate> isValid() {
-        return candidate -> candidate.getAge() >= fromAge
+    public int periodInUkrConvertedToYears(Candidate candidate) {
+        String period = candidate.getPeriodsInUkr();
+        int years = Math.abs(
+                Integer.parseInt(period.split("-")[0])
+                        - Integer.parseInt(period.split("-")[1])
+        );
+        return years;
+    }
+
+    @Override
+    public boolean test(Candidate candidate) {
+        return candidate.getAge() >= fromAge
                 && candidate.isAllowedToVote()
                 && nationality.equals(candidate.getNationality())
-                && livePeriod.equals(candidate.getPeriodsInUkr());
+                && periodInUkrConvertedToYears(candidate) > MIN_LIVE_PERIOD;
     }
 }
+
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 97a568510..7a9aaf7d3 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -25,7 +25,7 @@ public int findMinEvenNumber(List<String> numbers) {
                 .filter(n -> n % 2 == 0)
                 .min(Integer::compare)
                 .orElseThrow(() -> new RuntimeException(
-                        "Cant't get min value from list: " + numbers));
+                        "Can't get min value from list: " + numbers));
     }
 
     /**
@@ -52,7 +52,7 @@ public Double getOddNumsAverage(List<Integer> numbers) {
      */
     public List<Person> selectMenByAge(List<Person> peopleList, int fromAge, int toAge) {
         return peopleList.stream()
-                .filter(p -> p.getSex() == Person.Sex.MAN
+                .filter(p -> p.getSex().equals(Person.Sex.MAN)
                 && (p.getAge() >= fromAge && p.getAge() <= toAge))
                 .toList();
     }
@@ -72,7 +72,7 @@ public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
         return peopleList.stream()
                 .filter(p -> (p.getSex() == Person.Sex.MAN
                         && (p.getAge() >= fromAge && p.getAge() <= maleToAge))
-                        || (p.getSex() == Person.Sex.WOMAN
+                        || (p.getSex().equals(Person.Sex.WOMAN)
                         && (p.getAge() >= fromAge && p.getAge() <= femaleToAge)))
                 .toList();
     }
@@ -84,7 +84,7 @@ public List<Person> getWorkablePeople(int fromAge, int femaleToAge,
      */
     public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
         return peopleList.stream()
-                .filter(p -> p.getSex() == Person.Sex.WOMAN && p.getAge() >= femaleAge)
+                .filter(p -> p.getSex().equals(Person.Sex.WOMAN) && p.getAge() >= femaleAge)
                 .flatMap(p -> p.getCats().stream())
                 .map(Cat::getName)
                 .toList();
@@ -104,7 +104,7 @@ public List<String> getCatsNames(List<Person> peopleList, int femaleAge) {
      */
     public List<String> validateCandidates(List<Candidate> candidates) {
         return candidates.stream()
-                .filter(CandidateValidator.isValid())
+                .filter(new CandidateValidator())
                 .map(Candidate::getName)
                 .sorted()
                 .toList();

From 9fee0c3bc0cba788d02b2a0b2774e760ad3924cd Mon Sep 17 00:00:00 2001
From: Michal Brynkiewicz <michalbry@autograf.pl>
Date: Thu, 14 May 2026 13:05:48 +0200
Subject: [PATCH 8/8] changes nad fixes applied

---
 src/main/java/practice/CandidateValidator.java | 12 ++++++------
 src/main/java/practice/StreamPractice.java     |  6 +++---
 2 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/src/main/java/practice/CandidateValidator.java b/src/main/java/practice/CandidateValidator.java
index 685b04ad1..1b57986e4 100644
--- a/src/main/java/practice/CandidateValidator.java
+++ b/src/main/java/practice/CandidateValidator.java
@@ -4,11 +4,11 @@
 import model.Candidate;
 
 public class CandidateValidator implements Predicate<Candidate> {
-    public static final int fromAge = 35;
-    public static final String nationality = "Ukrainian";
+    public static final int MIN_AGE = 35;
+    public static final String REQUIRED_NATIONALITY = "Ukrainian";
     public static final int MIN_LIVE_PERIOD = 10;
 
-    public int periodInUkrConvertedToYears(Candidate candidate) {
+    private int getYearsInUkraine(Candidate candidate) {
         String period = candidate.getPeriodsInUkr();
         int years = Math.abs(
                 Integer.parseInt(period.split("-")[0])
@@ -19,10 +19,10 @@ public int periodInUkrConvertedToYears(Candidate candidate) {
 
     @Override
     public boolean test(Candidate candidate) {
-        return candidate.getAge() >= fromAge
+        return candidate.getAge() >= MIN_AGE
                 && candidate.isAllowedToVote()
-                && nationality.equals(candidate.getNationality())
-                && periodInUkrConvertedToYears(candidate) > MIN_LIVE_PERIOD;
+                && REQUIRED_NATIONALITY.equals(candidate.getNationality())
+                && getYearsInUkraine(candidate) >= MIN_LIVE_PERIOD;
     }
 }
 
diff --git a/src/main/java/practice/StreamPractice.java b/src/main/java/practice/StreamPractice.java
index 7a9aaf7d3..9c9707fab 100644
--- a/src/main/java/practice/StreamPractice.java
+++ b/src/main/java/practice/StreamPractice.java
@@ -19,11 +19,11 @@ public class StreamPractice {
      */
     public int findMinEvenNumber(List<String> numbers) {
         return numbers.stream()
-                .flatMap(n -> Arrays.stream(n.split(",")))
+                .flatMap(s -> Arrays.stream(s.split(",")))
                 .map(String::trim)
-                .map(Integer::parseInt)
+                .mapToInt(Integer::parseInt)
                 .filter(n -> n % 2 == 0)
-                .min(Integer::compare)
+                .min()
                 .orElseThrow(() -> new RuntimeException(
                         "Can't get min value from list: " + numbers));
     }