reading from file

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

@@ -1,8 +1,43 @@
 package core.basesyntax;
 
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
 public class FileWork {
+    private static final String SPECIFIED_CHARACTER = "w";
+    private static final String WORD_SEPARATOR = " ";
+
     public String[] readFromFile(String fileName) {
-        //write your code here
-        return null;
+        try (BufferedReader bufferedReader = new BufferedReader(new FileReader(fileName))) {
+            String read = bufferedReader.readLine();
+            List<String> stringList = new ArrayList<>();
+            while (read != null) {
+                read = read.toLowerCase();
+                String[] words = read.split(WORD_SEPARATOR);
+                for (String word : words) {
+                    if (word.startsWith(SPECIFIED_CHARACTER)) {
+                        stringList.add(word.replaceAll("\\p{Punct}", ""));
+                    }
+                }
+                Collections.sort(stringList);
+                read = bufferedReader.readLine();
+            }
+            String[] stringArray = new String[stringList.size()];
+
+            for (int i = 0; i < stringArray.length; i++) {
+                stringArray[i] = stringList.get(i);
+            }
+            if (stringList.isEmpty()) {
+                return new String[]{};
+            } else {
+                return stringArray;
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("File not found exception");
+        }
     }
 }