fix some nonconformity after checkstyle

client/src/main/java/org/apache/rocketmq/client/ClientConfig.java

@@ -94,7 +94,7 @@ public class ClientConfig {
 
     public void changeInstanceNameToPID() {
         if (this.instanceName.equals("DEFAULT")) {
-            this.instanceName = UtilAll.getPid()+ "#" + System.nanoTime();
+            this.instanceName = UtilAll.getPid() + "#" + System.nanoTime();
         }
     }
 

common/src/main/java/org/apache/rocketmq/common/utils/NameServerAddressUtils.java

@@ -34,7 +34,7 @@ public class NameServerAddressUtils {
         if (StringUtils.isEmpty(endpoint)) {
             return null;
         }
-        return endpoint.substring(endpoint.lastIndexOf("/")+1, endpoint.indexOf('.'));
+        return endpoint.substring(endpoint.lastIndexOf("/") + 1, endpoint.indexOf('.'));
     }
 
     public static String getNameSrvAddrFromNamesrvEndpoint(String nameSrvEndpoint) {

example/src/main/java/org/apache/rocketmq/example/ordermessage/Producer.java

@@ -16,12 +16,9 @@
  */
 package org.apache.rocketmq.example.ordermessage;
 
-import java.io.UnsupportedEncodingException;
-import java.util.List;
 import org.apache.rocketmq.client.exception.MQBrokerException;
 import org.apache.rocketmq.client.exception.MQClientException;
 import org.apache.rocketmq.client.producer.DefaultMQProducer;
-import org.apache.rocketmq.client.producer.MQProducer;
 import org.apache.rocketmq.client.producer.MessageQueueSelector;
 import org.apache.rocketmq.client.producer.SendResult;
 import org.apache.rocketmq.common.message.Message;
@@ -29,6 +26,9 @@ import org.apache.rocketmq.common.message.MessageQueue;
 import org.apache.rocketmq.remoting.common.RemotingHelper;
 import org.apache.rocketmq.remoting.exception.RemotingException;
 
+import java.io.UnsupportedEncodingException;
+import java.util.List;
+
 public class Producer {
     public static void main(String[] args) throws UnsupportedEncodingException {
         try {