diff --git a/netty/service/src/main/java/cn/bunny/service/netty/demo6/ByteBufDemo.java b/netty/service/src/main/java/cn/bunny/service/netty/demo6/ByteBufDemo.java
new file mode 100644
index 0000000..c1b3b3b
--- /dev/null
+++ b/netty/service/src/main/java/cn/bunny/service/netty/demo6/ByteBufDemo.java
@@ -0,0 +1,18 @@
+package cn.bunny.service.netty.demo6;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+
+public class ByteBufDemo {
+    public static void main(String[] args) {
+        ByteBuf buf = ByteBufAllocator.DEFAULT.buffer();
+        System.out.println(buf);
+        StringBuilder stringBuilder = new StringBuilder();
+
+        for (int i = 0; i < 300; i++) {
+            stringBuilder.append("a");
+        }
+        buf.writeBytes(stringBuilder.toString().getBytes());
+        System.out.println(buf);
+    }
+}