initial commit

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

@@ -1,8 +1,44 @@
 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 SPASE_WITH_PUNCTUATION = "\\W+";
+    private static final String PREFIX = "w";
+    private final StringBuilder readText = new StringBuilder();
+    private final StringBuilder filterText = new StringBuilder();
+
     public String[] readFromFile(String fileName) {
-        //write your code here
-        return null;
+        try (BufferedReader reader = new BufferedReader(new FileReader(fileName))) {
+            String value = reader.readLine();
+            while (value != null) {
+                readText.append(value).append(System.lineSeparator());
+                value = reader.readLine();
+            }
+        } catch (IOException e) {
+            throw new RuntimeException("Can't read file with name" + fileName, e);
+        }
+        if (!readText.isEmpty()) {
+            return filter(readText);
+        }
+        return new String[0];
+    }
+
+    private String[] filter(StringBuilder inputText) {
+        String[] splitWords = inputText.toString().toLowerCase().split(SPASE_WITH_PUNCTUATION);
+        for (String currentWord : splitWords) {
+            if (currentWord.startsWith(PREFIX)) {
+                filterText.append(currentWord).append(" ");
+            }
+        }
+        if (filterText.isEmpty()) {
+            return new String[0];
+        }
+        String[] result = filterText.toString().split(SPASE_WITH_PUNCTUATION);
+        Arrays.sort(result);
+        return result;
     }
 }