[MINOR][BUILD] Fix CheckStyle Error

## What changes were proposed in this pull request?
This PR is to fix the code style errors before 2.0.1 release.

## How was this patch tested?
Manual.

Before:
```
./dev/lint-java
Using `mvn` from path: /usr/local/bin/mvn
Checkstyle checks failed at following occurrences:
[ERROR] src/main/java/org/apache/spark/network/client/TransportClient.java:[153] (sizes) LineLength: Line is longer than 100 characters (found 107).
[ERROR] src/main/java/org/apache/spark/network/client/TransportClient.java:[196] (sizes) LineLength: Line is longer than 100 characters (found 108).
[ERROR] src/main/java/org/apache/spark/network/client/TransportClient.java:[239] (sizes) LineLength: Line is longer than 100 characters (found 115).
[ERROR] src/main/java/org/apache/spark/network/server/TransportRequestHandler.java:[119] (sizes) LineLength: Line is longer than 100 characters (found 107).
[ERROR] src/main/java/org/apache/spark/network/server/TransportRequestHandler.java:[129] (sizes) LineLength: Line is longer than 100 characters (found 104).
[ERROR] src/main/java/org/apache/spark/network/util/LevelDBProvider.java:[124,11] (modifier) ModifierOrder: 'static' modifier out of order with the JLS suggestions.
[ERROR] src/main/java/org/apache/spark/network/util/TransportConf.java:[26] (regexp) RegexpSingleline: No trailing whitespace allowed.
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java:[33] (sizes) LineLength: Line is longer than 100 characters (found 110).
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java:[38] (sizes) LineLength: Line is longer than 100 characters (found 110).
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java:[43] (sizes) LineLength: Line is longer than 100 characters (found 106).
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java:[48] (sizes) LineLength: Line is longer than 100 characters (found 110).
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java:[0] (misc) NewlineAtEndOfFile: File does not end with a newline.
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java:[67] (sizes) LineLength: Line is longer than 100 characters (found 106).
[ERROR] src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java:[200] (regexp) RegexpSingleline: No trailing whitespace allowed.
[ERROR] src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java:[309] (regexp) RegexpSingleline: No trailing whitespace allowed.
[ERROR] src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java:[332] (regexp) RegexpSingleline: No trailing whitespace allowed.
[ERROR] src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java:[348] (regexp) RegexpSingleline: No trailing whitespace allowed.
 ```
After:
```
./dev/lint-java
Using `mvn` from path: /usr/local/bin/mvn
Checkstyle checks passed.
```

Author: Weiqing Yang <yangweiqing001@gmail.com>

Closes #15170 from Sherry302/fixjavastyle.

4 files changed, 12 insertions, 10 deletions

diff --git a/common/network-common/src/main/java/org/apache/spark/network/client/TransportClient.java b/common/network-common/src/main/java/org/apache/spark/network/client/TransportClient.java
index 600b80e2c5..7e7d78d42a 100644
--- a/common/network-common/src/main/java/org/apache/spark/network/client/TransportClient.java
+++ b/common/network-common/src/main/java/org/apache/spark/network/client/TransportClient.java
@@ -150,8 +150,8 @@ public class TransportClient implements Closeable {
           if (future.isSuccess()) {
             long timeTaken = System.currentTimeMillis() - startTime;
             if (logger.isTraceEnabled()) {
-              logger.trace("Sending request {} to {} took {} ms", streamChunkId, getRemoteAddress(channel),
-                timeTaken);
+              logger.trace("Sending request {} to {} took {} ms", streamChunkId,
+                getRemoteAddress(channel), timeTaken);
             }
           } else {
             String errorMsg = String.format("Failed to send request %s to %s: %s", streamChunkId,
@@ -193,8 +193,8 @@ public class TransportClient implements Closeable {
             if (future.isSuccess()) {
               long timeTaken = System.currentTimeMillis() - startTime;
               if (logger.isTraceEnabled()) {
-                logger.trace("Sending request for {} to {} took {} ms", streamId, getRemoteAddress(channel),
-                  timeTaken);
+                logger.trace("Sending request for {} to {} took {} ms", streamId,
+                  getRemoteAddress(channel), timeTaken);
               }
             } else {
               String errorMsg = String.format("Failed to send request for %s to %s: %s", streamId,
@@ -236,7 +236,8 @@ public class TransportClient implements Closeable {
           if (future.isSuccess()) {
             long timeTaken = System.currentTimeMillis() - startTime;
             if (logger.isTraceEnabled()) {
-              logger.trace("Sending request {} to {} took {} ms", requestId, getRemoteAddress(channel), timeTaken);
+              logger.trace("Sending request {} to {} took {} ms", requestId,
+                getRemoteAddress(channel), timeTaken);
             }
           } else {
             String errorMsg = String.format("Failed to send RPC %s to %s: %s", requestId,
diff --git a/common/network-common/src/main/java/org/apache/spark/network/server/TransportRequestHandler.java b/common/network-common/src/main/java/org/apache/spark/network/server/TransportRequestHandler.java
index 0373ed950e..900e8eb255 100644
--- a/common/network-common/src/main/java/org/apache/spark/network/server/TransportRequestHandler.java
+++ b/common/network-common/src/main/java/org/apache/spark/network/server/TransportRequestHandler.java
@@ -116,7 +116,8 @@ public class TransportRequestHandler extends MessageHandler<RequestMessage> {
 
   private void processFetchRequest(final ChunkFetchRequest req) {
     if (logger.isTraceEnabled()) {
-      logger.trace("Received req from {} to fetch block {}", getRemoteAddress(channel), req.streamChunkId);
+      logger.trace("Received req from {} to fetch block {}", getRemoteAddress(channel),
+        req.streamChunkId);
     }
 
     ManagedBuffer buf;
@@ -125,8 +126,8 @@ public class TransportRequestHandler extends MessageHandler<RequestMessage> {
       streamManager.registerChannel(channel, req.streamChunkId.streamId);
       buf = streamManager.getChunk(req.streamChunkId.streamId, req.streamChunkId.chunkIndex);
     } catch (Exception e) {
-      logger.error(String.format(
-        "Error opening block %s for request from %s", req.streamChunkId, getRemoteAddress(channel)), e);
+      logger.error(String.format("Error opening block %s for request from %s",
+        req.streamChunkId, getRemoteAddress(channel)), e);
       respond(new ChunkFetchFailure(req.streamChunkId, Throwables.getStackTraceAsString(e)));
       return;
     }
diff --git a/common/network-common/src/main/java/org/apache/spark/network/util/LevelDBProvider.java b/common/network-common/src/main/java/org/apache/spark/network/util/LevelDBProvider.java
index ec900a7b3c..f96d068cf3 100644
--- a/common/network-common/src/main/java/org/apache/spark/network/util/LevelDBProvider.java
+++ b/common/network-common/src/main/java/org/apache/spark/network/util/LevelDBProvider.java
@@ -121,7 +121,7 @@ public class LevelDBProvider {
 
   public static class StoreVersion {
 
-    final static byte[] KEY = "StoreVersion".getBytes(StandardCharsets.UTF_8);
+    static final byte[] KEY = "StoreVersion".getBytes(StandardCharsets.UTF_8);
 
     public final int major;
     public final int minor;
diff --git a/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java b/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
index 7d5baa9a9c..64eaba103c 100644
--- a/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
+++ b/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
@@ -23,7 +23,7 @@ import com.google.common.primitives.Ints;
  * A central location that tracks all the settings we expose to users.
  */
 public class TransportConf {
-  
+
   static {
     // Set this due to Netty PR #5661 for Netty 4.0.37+ to work
     System.setProperty("io.netty.maxDirectMemory", "0");