diff --git a/core-java-io/.gitignore b/core-java-io/.gitignore
index 520f176acc..13d4d1f833 100644
--- a/core-java-io/.gitignore
+++ b/core-java-io/.gitignore
@@ -1,7 +1,4 @@
 0.*
 
 # Files generated by integration tests
-*.txt
-backup-pom.xml
-/bin/
-/temp
+# *.txt
diff --git a/core-java-io/src/test/java/com/baeldung/java/nio2/async/AsyncFileIntegrationTest.java b/core-java-io/src/test/java/com/baeldung/java/nio2/async/AsyncFileIntegrationTest.java
index e2f7a0303a..cf37b92565 100644
--- a/core-java-io/src/test/java/com/baeldung/java/nio2/async/AsyncFileIntegrationTest.java
+++ b/core-java-io/src/test/java/com/baeldung/java/nio2/async/AsyncFileIntegrationTest.java
@@ -17,18 +17,19 @@ import java.util.concurrent.Future;
 import static org.junit.Assert.assertEquals;
 
 public class AsyncFileIntegrationTest {
+
     @Test
     public void givenPath_whenReadsContentWithFuture_thenCorrect() throws IOException, ExecutionException, InterruptedException {
-        Path path = Paths.get(URI.create(this.getClass().getClassLoader().getResource("file.txt").toString()));
-        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.READ);
+        final Path path = Paths.get(URI.create(this.getClass().getClassLoader().getResource("file.txt").toString()));
+        final AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.READ);
 
-        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        final ByteBuffer buffer = ByteBuffer.allocate(1024);
 
-        Future<Integer> operation = fileChannel.read(buffer, 0);
+        final Future<Integer> operation = fileChannel.read(buffer, 0);
 
         operation.get();
 
-        String fileContent = new String(buffer.array()).trim();
+        final String fileContent = new String(buffer.array()).trim();
         buffer.clear();
 
         assertEquals(fileContent, "baeldung.com");
@@ -36,18 +37,16 @@ public class AsyncFileIntegrationTest {
 
     @Test
     public void givenPath_whenReadsContentWithCompletionHandler_thenCorrect() throws IOException {
-        Path path = Paths.get(URI.create(AsyncFileIntegrationTest.class.getResource("/file.txt").toString()));
-        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.READ);
+        final Path path = Paths.get(URI.create(this.getClass().getClassLoader().getResource("file.txt").toString()));
+        final AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.READ);
 
-        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        final ByteBuffer buffer = ByteBuffer.allocate(1024);
 
         fileChannel.read(buffer, 0, buffer, new CompletionHandler<Integer, ByteBuffer>() {
-
             @Override
             public void completed(Integer result, ByteBuffer attachment) {
                 // result is number of bytes read
                 // attachment is the buffer
-
             }
 
             @Override
@@ -59,42 +58,40 @@ public class AsyncFileIntegrationTest {
 
     @Test
     public void givenPathAndContent_whenWritesToFileWithFuture_thenCorrect() throws IOException, ExecutionException, InterruptedException {
-        String fileName = "temp";
-        Path path = Paths.get(fileName);
-        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.CREATE);
+        final String fileName = "temp";
+        final Path path = Paths.get(fileName);
+        final AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.CREATE);
 
-        ByteBuffer buffer = ByteBuffer.allocate(1024);
-        long position = 0;
+        final ByteBuffer buffer = ByteBuffer.allocate(1024);
+        final long position = 0;
 
         buffer.put("hello world".getBytes());
         buffer.flip();
 
-        Future<Integer> operation = fileChannel.write(buffer, position);
+        final Future<Integer> operation = fileChannel.write(buffer, position);
         buffer.clear();
 
         operation.get();
 
-        String content = readContent(path);
+        final String content = readContent(path);
         assertEquals("hello world", content);
     }
 
     @Test
     public void givenPathAndContent_whenWritesToFileWithHandler_thenCorrect() throws IOException {
-        String fileName = UUID.randomUUID().toString();
-        Path path = Paths.get(fileName);
-        AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.DELETE_ON_CLOSE);
+        final String fileName = UUID.randomUUID().toString();
+        final Path path = Paths.get(fileName);
+        final AsynchronousFileChannel fileChannel = AsynchronousFileChannel.open(path, StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.DELETE_ON_CLOSE);
 
-        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        final ByteBuffer buffer = ByteBuffer.allocate(1024);
         buffer.put("hello world".getBytes());
         buffer.flip();
 
         fileChannel.write(buffer, 0, buffer, new CompletionHandler<Integer, ByteBuffer>() {
-
             @Override
             public void completed(Integer result, ByteBuffer attachment) {
                 // result is number of bytes written
                 // attachment is the buffer
-
             }
 
             @Override
@@ -104,23 +101,25 @@ public class AsyncFileIntegrationTest {
         });
     }
 
-    public static String readContent(Path file) throws ExecutionException, InterruptedException {
+    //
+
+    private String readContent(Path file) throws ExecutionException, InterruptedException {
         AsynchronousFileChannel fileChannel = null;
         try {
             fileChannel = AsynchronousFileChannel.open(file, StandardOpenOption.READ);
         } catch (IOException e) {
-            // TODO Auto-generated catch block
             e.printStackTrace();
         }
 
-        ByteBuffer buffer = ByteBuffer.allocate(1024);
+        final ByteBuffer buffer = ByteBuffer.allocate(1024);
 
-        Future<Integer> operation = fileChannel.read(buffer, 0);
+        final Future<Integer> operation = fileChannel.read(buffer, 0);
 
         operation.get();
 
-        String fileContent = new String(buffer.array()).trim();
+        final String fileContent = new String(buffer.array()).trim();
         buffer.clear();
         return fileContent;
     }
+
 }
\ No newline at end of file
diff --git a/core-java/src/test/resources/file.txt b/core-java/src/test/resources/file.txt
deleted file mode 100644
index 558d8bbf35..0000000000
--- a/core-java/src/test/resources/file.txt
+++ /dev/null
@@ -1 +0,0 @@
-baeldung.com
\ No newline at end of file