[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.

3 files changed, 11 insertions, 7 deletions

diff --git a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java
index 116c84943e..0910db22af 100644
--- a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java
+++ b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/PrefixComparators.java
@@ -30,22 +30,26 @@ public class PrefixComparators {
   public static final PrefixComparator STRING = new UnsignedPrefixComparator();
   public static final PrefixComparator STRING_DESC = new UnsignedPrefixComparatorDesc();
   public static final PrefixComparator STRING_NULLS_LAST = new UnsignedPrefixComparatorNullsLast();
-  public static final PrefixComparator STRING_DESC_NULLS_FIRST = new UnsignedPrefixComparatorDescNullsFirst();
+  public static final PrefixComparator STRING_DESC_NULLS_FIRST =
+    new UnsignedPrefixComparatorDescNullsFirst();
 
   public static final PrefixComparator BINARY = new UnsignedPrefixComparator();
   public static final PrefixComparator BINARY_DESC = new UnsignedPrefixComparatorDesc();
   public static final PrefixComparator BINARY_NULLS_LAST = new UnsignedPrefixComparatorNullsLast();
-  public static final PrefixComparator BINARY_DESC_NULLS_FIRST = new UnsignedPrefixComparatorDescNullsFirst();
+  public static final PrefixComparator BINARY_DESC_NULLS_FIRST =
+    new UnsignedPrefixComparatorDescNullsFirst();
 
   public static final PrefixComparator LONG = new SignedPrefixComparator();
   public static final PrefixComparator LONG_DESC = new SignedPrefixComparatorDesc();
   public static final PrefixComparator LONG_NULLS_LAST = new SignedPrefixComparatorNullsLast();
-  public static final PrefixComparator LONG_DESC_NULLS_FIRST = new SignedPrefixComparatorDescNullsFirst();
+  public static final PrefixComparator LONG_DESC_NULLS_FIRST =
+    new SignedPrefixComparatorDescNullsFirst();
 
   public static final PrefixComparator DOUBLE = new UnsignedPrefixComparator();
   public static final PrefixComparator DOUBLE_DESC = new UnsignedPrefixComparatorDesc();
   public static final PrefixComparator DOUBLE_NULLS_LAST = new UnsignedPrefixComparatorNullsLast();
-  public static final PrefixComparator DOUBLE_DESC_NULLS_FIRST = new UnsignedPrefixComparatorDescNullsFirst();
+  public static final PrefixComparator DOUBLE_DESC_NULLS_FIRST =
+    new UnsignedPrefixComparatorDescNullsFirst();
 
   public static final class StringPrefixComparator {
     public static long computePrefix(UTF8String value) {
diff --git a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java
index 3b1ece4373..8ecd20910a 100644
--- a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java
+++ b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java
@@ -347,4 +347,4 @@ public final class UnsafeInMemorySorter {
       return new SortedIterator(pos / 2, offset);
     }
   }
-}
\ No newline at end of file
+}
diff --git a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java
index 2875b0d69d..e6d9766c31 100644
--- a/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java
+++ b/core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeSorterSpillReader.java
@@ -64,8 +64,8 @@ public final class UnsafeSorterSpillReader extends UnsafeSorterIterator implemen
     if (bufferSizeBytes > MAX_BUFFER_SIZE_BYTES || bufferSizeBytes < DEFAULT_BUFFER_SIZE_BYTES) {
       // fall back to a sane default value
       logger.warn("Value of config \"spark.unsafe.sorter.spill.reader.buffer.size\" = {} not in " +
-                      "allowed range [{}, {}). Falling back to default value : {} bytes", bufferSizeBytes,
-                  DEFAULT_BUFFER_SIZE_BYTES, MAX_BUFFER_SIZE_BYTES, DEFAULT_BUFFER_SIZE_BYTES);
+        "allowed range [{}, {}). Falling back to default value : {} bytes", bufferSizeBytes,
+        DEFAULT_BUFFER_SIZE_BYTES, MAX_BUFFER_SIZE_BYTES, DEFAULT_BUFFER_SIZE_BYTES);
       bufferSizeBytes = DEFAULT_BUFFER_SIZE_BYTES;
     }