diff --git a/codec/src/main/java/io/netty/handler/codec/CodecUtil.java b/codec/src/main/java/io/netty/handler/codec/CodecUtil.java
index de26a0e266..30966c1643 100644
--- a/codec/src/main/java/io/netty/handler/codec/CodecUtil.java
+++ b/codec/src/main/java/io/netty/handler/codec/CodecUtil.java
@@ -98,9 +98,7 @@ final class CodecUtil {
         }
 
         Class<?>[] newAllowedMsgTypes = new Class[numElem];
-        for (int i = 0; i < numElem; i ++) {
-            newAllowedMsgTypes[i] = acceptedMsgTypes[i];
-        }
+        System.arraycopy(acceptedMsgTypes, 0, newAllowedMsgTypes, 0, numElem);
 
         return newAllowedMsgTypes;
     }
diff --git a/example/src/main/java/io/netty/example/http/snoop/HttpSnoopServerHandler.java b/example/src/main/java/io/netty/example/http/snoop/HttpSnoopServerHandler.java
index 1adad5709d..ddea7dafc0 100644
--- a/example/src/main/java/io/netty/example/http/snoop/HttpSnoopServerHandler.java
+++ b/example/src/main/java/io/netty/example/http/snoop/HttpSnoopServerHandler.java
@@ -62,12 +62,14 @@ public class HttpSnoopServerHandler extends ChannelInboundMessageHandlerAdapter<
             buf.append("WELCOME TO THE WILD WILD WEB SERVER\r\n");
             buf.append("===================================\r\n");
 
-            buf.append("VERSION: " + request.getProtocolVersion() + "\r\n");
-            buf.append("HOSTNAME: " + getHost(request, "unknown") + "\r\n");
-            buf.append("REQUEST_URI: " + request.getUri() + "\r\n\r\n");
+            buf.append("VERSION: ").append(request.getProtocolVersion()).append("\r\n");
+            buf.append("HOSTNAME: ").append(getHost(request, "unknown")).append("\r\n");
+            buf.append("REQUEST_URI: ").append(request.getUri()).append("\r\n\r\n");
 
             for (Map.Entry<String, String> h: request.getHeaders()) {
-                buf.append("HEADER: " + h.getKey() + " = " + h.getValue() + "\r\n");
+                String key = h.getKey();
+                String value = h.getValue();
+                buf.append("HEADER: ").append(key).append(" = ").append(value).append("\r\n");
             }
             buf.append("\r\n");
 
@@ -78,7 +80,7 @@ public class HttpSnoopServerHandler extends ChannelInboundMessageHandlerAdapter<
                     String key = p.getKey();
                     List<String> vals = p.getValue();
                     for (String val : vals) {
-                        buf.append("PARAM: " + key + " = " + val + "\r\n");
+                        buf.append("PARAM: ").append(key).append(" = ").append(val).append("\r\n");
                     }
                 }
                 buf.append("\r\n");
@@ -89,7 +91,9 @@ public class HttpSnoopServerHandler extends ChannelInboundMessageHandlerAdapter<
             } else {
                 ByteBuf content = request.getContent();
                 if (content.readable()) {
-                    buf.append("CONTENT: " + content.toString(CharsetUtil.UTF_8) + "\r\n");
+                    buf.append("CONTENT: ");
+                    buf.append(content.toString(CharsetUtil.UTF_8));
+                    buf.append("\r\n");
                 }
                 writeResponse(ctx);
             }
@@ -104,7 +108,8 @@ public class HttpSnoopServerHandler extends ChannelInboundMessageHandlerAdapter<
                     buf.append("\r\n");
                     for (String name: trailer.getHeaderNames()) {
                         for (String value: trailer.getHeaders(name)) {
-                            buf.append("TRAILING HEADER: " + name + " = " + value + "\r\n");
+                            buf.append("TRAILING HEADER: ");
+                            buf.append(name).append(" = ").append(value).append("\r\n");
                         }
                     }
                     buf.append("\r\n");
@@ -112,7 +117,8 @@ public class HttpSnoopServerHandler extends ChannelInboundMessageHandlerAdapter<
 
                 writeResponse(ctx);
             } else {
-                buf.append("CHUNK: " + chunk.getContent().toString(CharsetUtil.UTF_8) + "\r\n");
+                buf.append("CHUNK: ");
+                buf.append(chunk.getContent().toString(CharsetUtil.UTF_8)).append("\r\n");
             }
         }
     }
diff --git a/transport/src/main/java/io/netty/channel/local/LocalChannel.java b/transport/src/main/java/io/netty/channel/local/LocalChannel.java
index 9b86ca75e1..0b02e1290f 100755
--- a/transport/src/main/java/io/netty/channel/local/LocalChannel.java
+++ b/transport/src/main/java/io/netty/channel/local/LocalChannel.java
@@ -34,6 +34,7 @@ import java.nio.channels.AlreadyConnectedException;
 import java.nio.channels.ClosedChannelException;
 import java.nio.channels.ConnectionPendingException;
 import java.nio.channels.NotYetConnectedException;
+import java.util.Collections;
 
 /**
  * A {@link Channel} for the local transport.
@@ -229,9 +230,7 @@ public class LocalChannel extends AbstractChannel {
                 @Override
                 public void run() {
                     MessageBuf<Object> buf = peerPipeline.inboundMessageBuffer();
-                    for (Object m: msgs) {
-                        buf.add(m);
-                    }
+                    Collections.addAll(buf, msgs);
                     peerPipeline.fireInboundBufferUpdated();
                 }
             });
diff --git a/transport/src/main/java/io/netty/channel/socket/aio/AbstractAioChannel.java b/transport/src/main/java/io/netty/channel/socket/aio/AbstractAioChannel.java
index ac31001d50..7b7dc8e136 100755
--- a/transport/src/main/java/io/netty/channel/socket/aio/AbstractAioChannel.java
+++ b/transport/src/main/java/io/netty/channel/socket/aio/AbstractAioChannel.java
@@ -68,7 +68,7 @@ abstract class AbstractAioChannel extends AbstractChannel {
 
     @Override
     protected Runnable doRegister() throws Exception {
-        if (((AioEventLoop) eventLoop()).parent() != group) {
+        if (eventLoop().parent() != group) {
             throw new ChannelException(
                     getClass().getSimpleName() + " must be registered to the " +
                     AioEventLoopGroup.class.getSimpleName() + " which was specified in the constructor.");