Difference between NIO and NIO.2?

core-java-modules/core-java-nio-2/src/test/java/com/baeldung/niovsnio2/NioVsNio2UnitTest.java

@@ -0,0 +1,70 @@
+package com.baeldung.niovsnio2;
+
+import org.junit.Test;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.stream.Stream;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class NioVsNio2UnitTest {
+
+    @Test
+    public void readFromFileUsingFileIO() throws Exception {
+        File file = new File("src/test/resources/nio-vs-nio2.txt");
+        FileInputStream in = new FileInputStream(file);
+        StringBuilder content = new StringBuilder();
+        int data = in.read();
+        while (data != -1) {
+            content.append((char) data);
+            data = in.read();
+        }
+        in.close();
+        assertThat(content.toString()).isEqualTo("Hello from file!");
+    }
+
+    @Test
+    public void readFromFileUsingFileChannel() throws Exception {
+        RandomAccessFile file = new RandomAccessFile("src/test/resources/nio-vs-nio2.txt", "r");
+        FileChannel channel = file.getChannel();
+        StringBuilder content = new StringBuilder();
+
+        ByteBuffer buffer = ByteBuffer.allocate(256);
+        int bytesRead = channel.read(buffer);
+        while (bytesRead != -1) {
+            buffer.flip();
+
+            while (buffer.hasRemaining()) {
+                content.append((char) buffer.get());
+            }
+
+            buffer.clear();
+            bytesRead = channel.read(buffer);
+        }
+        file.close();
+
+        assertThat(content.toString()).isEqualTo("Hello from file!");
+    }
+
+    @Test
+    public void readFromFileUsingNIO2() throws Exception {
+        List<String> strings = Files.readAllLines(Paths.get("src/test/resources/nio-vs-nio2.txt"));
+
+        assertThat(strings.get(0)).isEqualTo("Hello from file!");
+    }
+
+    @Test
+    public void listFilesUsingWalk() throws Exception {
+        Path path = Paths.get("src/test");
+        Stream<Path> walk = Files.walk(path);
+        walk.forEach(System.out::println);
+    }
+}

core-java-modules/core-java-nio-2/src/test/resources/nio-vs-nio2.txt

@@ -0,0 +1 @@
+Hello from file!