Add my solution

src/main/java/com/epam/izh/rd/online/service/SimpleTextStatisticsAnalyzer.java

@@ -23,7 +23,11 @@ public class SimpleTextStatisticsAnalyzer implements TextStatisticsAnalyzer {
      */
     @Override
     public int countSumLengthOfWords(String text) {
-        return 0;
+        int sumLengthOfWords = 0;
+        for (String word : getWords(text)) {
+            sumLengthOfWords += word.length();
+        }
+        return sumLengthOfWords;
     }
 
     /**
@@ -34,7 +38,7 @@ public int countSumLengthOfWords(String text) {
      */
     @Override
     public int countNumberOfWords(String text) {
-        return 0;
+        return getWords(text).size();
     }
 
     /**
@@ -44,7 +48,7 @@ public int countNumberOfWords(String text) {
      */
     @Override
     public int countNumberOfUniqueWords(String text) {
-        return 0;
+        return getUniqueWords(text).size();
     }
 
     /**
@@ -57,7 +61,8 @@ public int countNumberOfUniqueWords(String text) {
      */
     @Override
     public List<String> getWords(String text) {
-        return emptyList();
+        String[] words = text.split("\\W+");
+        return Arrays.asList(words);
     }
 
     /**
@@ -70,7 +75,7 @@ public List<String> getWords(String text) {
      */
     @Override
     public Set<String> getUniqueWords(String text) {
-        return emptySet();
+        return new HashSet<>(getWords(text));
     }
 
     /**
@@ -82,7 +87,11 @@ public Set<String> getUniqueWords(String text) {
      */
     @Override
     public Map<String, Integer> countNumberOfWordsRepetitions(String text) {
-        return emptyMap();
+        Map<String, Integer> numberOfWordsRepetitions = new HashMap<>();
+        for (String word : getWords(text)) {
+            numberOfWordsRepetitions.merge(word, 1, Integer::sum);
+        }
+        return numberOfWordsRepetitions;
     }
 
     /**
@@ -95,6 +104,14 @@ public Map<String, Integer> countNumberOfWordsRepetitions(String text) {
      */
     @Override
     public List<String> sortWordsByLength(String text, Direction direction) {
-        return emptyList();
+        List<String> sortedWords = getWords(text);
+        sortedWords.sort(getStringComparator(direction));
+        return sortedWords;
+    }
+
+    private Comparator<String> getStringComparator(Direction direction) {
+        return direction.equals(Direction.ASC) ?
+                Comparator.comparing(String::length) :
+                Comparator.comparing(String::length).reversed();
     }
 }

src/main/java/com/epam/izh/rd/online/service/StreamApiTextStatisticsAnalyzer.java

@@ -2,10 +2,9 @@
 
 import com.epam.izh.rd.online.helper.Direction;
 
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import static java.util.Collections.*;
 
@@ -16,36 +15,42 @@
 public class StreamApiTextStatisticsAnalyzer implements TextStatisticsAnalyzer {
     @Override
     public int countSumLengthOfWords(String text) {
-        return 0;
+        return getWords(text).stream().mapToInt(String::length).sum();
     }
 
     @Override
     public int countNumberOfWords(String text) {
-        return 0;
+        return getWords(text).stream().mapToInt(a -> 1).sum();
     }
 
     @Override
     public int countNumberOfUniqueWords(String text) {
-        return 0;
+        return getWords(text).stream().collect(Collectors.toSet()).size();
     }
 
     @Override
     public List<String> getWords(String text) {
-        return emptyList();
+        return Stream.of(text.split("\\W+")).collect(Collectors.toList());
     }
 
     @Override
     public Set<String> getUniqueWords(String text) {
-        return emptySet();
+        return getWords(text).stream().collect(Collectors.toSet());
     }
 
     @Override
     public Map<String, Integer> countNumberOfWordsRepetitions(String text) {
-        return emptyMap();
+        return getWords(text).stream().collect(Collectors.toMap(word -> word, word -> 1, Integer::sum));
     }
 
     @Override
     public List<String> sortWordsByLength(String text, Direction direction) {
-        return emptyList();
+        return getWords(text).stream().sorted(getStringComparator(direction)).collect(Collectors.toList());
+    }
+
+    private Comparator<String> getStringComparator(Direction direction) {
+        return direction.equals(Direction.ASC) ?
+                Comparator.comparing(String::length) :
+                Comparator.comparing(String::length).reversed();
     }
 }