solution

src/main/java/core/basesyntax/FileWork.java

@@ -1,8 +1,58 @@
 package core.basesyntax;
 
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.Arrays;
+
 public class FileWork {
+    private static final int FIRST_LETTER_INDEX = 0;
+    private static final char FIRST_LETTER = 'w';
+    private static final int INITIAL_COUNTER_VALUE = 0;
+
     public String[] readFromFile(String fileName) {
-        //write your code here
-        return null;
+        String fileInfo;
+
+        try {
+            BufferedReader reader = new BufferedReader(new FileReader(fileName));
+            StringBuilder stringBuilder = new StringBuilder();
+            String value = reader.readLine();
+
+            while (value != null) {
+                stringBuilder.append(value).append(System.lineSeparator());
+                value = reader.readLine();
+            }
+
+            fileInfo = stringBuilder.toString().toLowerCase().replaceAll("\\p{Punct}", "");
+        } catch (IOException e) {
+            throw new RuntimeException("Can't read file", e);
+        }
+
+        String[] words = fileInfo.split("\\s+");
+
+        int wordsCounter = INITIAL_COUNTER_VALUE;
+
+        for (String word : words) {
+            if (word != null && !word.isEmpty()
+                    && word.toCharArray()[FIRST_LETTER_INDEX] == FIRST_LETTER) {
+                wordsCounter++;
+            }
+        }
+
+        String[] result = new String[wordsCounter];
+
+        wordsCounter = INITIAL_COUNTER_VALUE;
+
+        for (String word : words) {
+            if (word != null && !word.isEmpty()
+                    && word.toCharArray()[FIRST_LETTER_INDEX] == FIRST_LETTER) {
+                result[wordsCounter] = word;
+                wordsCounter++;
+            }
+        }
+
+        Arrays.sort(result);
+
+        return result;
     }
 }