Add files via upload

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

@@ -1,8 +1,39 @@
 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 String SEPARATOR_OF_WORDS = " ";
+
     public String[] readFromFile(String fileName) {
-        //write your code here
-        return null;
+        try {
+            BufferedReader reader = new BufferedReader(new FileReader(fileName));
+            int value = reader.read();
+            StringBuilder builder = new StringBuilder();
+            while (value != -1) {
+                builder.append((char) value);
+                value = reader.read();
+            }
+            String[] words = builder.toString().toLowerCase().split("\\W+");
+            StringBuilder resultBuilder = new StringBuilder();
+            for (String word : words) {
+                if (word.charAt(0) == 'w') {
+                    resultBuilder.append(word).append(SEPARATOR_OF_WORDS);
+                }
+            }
+            if (resultBuilder.toString().isEmpty()) {
+                return new String[0];
+            }
+            String[] appropriateWords = resultBuilder.toString().trim().split(SEPARATOR_OF_WORDS);
+            Arrays.sort(appropriateWords);
+            return appropriateWords;
+        } catch (IOException e) {
+            throw new RuntimeException("Can't read file " + e);
+        } catch (StringIndexOutOfBoundsException e) {
+            return new String[0];
+        }
     }
 }