[MINOR][BUILD] Fix lint-java breaks in Java

## What changes were proposed in this pull request?

This PR proposes to fix the lint-breaks as below:

```
[ERROR] src/test/java/org/apache/spark/network/TransportResponseHandlerSuite.java:[29,8] (imports) UnusedImports: Unused import - org.apache.spark.network.buffer.ManagedBuffer.
[ERROR] src/main/java/org/apache/spark/unsafe/types/UTF8String.java:[156,10] (modifier) ModifierOrder: 'Nonnull' annotation modifier does not precede non-annotation modifiers.
[ERROR] src/main/java/org/apache/spark/SparkFirehoseListener.java:[122] (sizes) LineLength: Line is longer than 100 characters (found 105).
[ERROR] src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeExternalSorter.java:[164,78] (coding) OneStatementPerLine: Only one statement per line allowed.
[ERROR] src/test/java/test/org/apache/spark/JavaAPISuite.java:[1157] (sizes) LineLength: Line is longer than 100 characters (found 121).
[ERROR] src/test/java/org/apache/spark/streaming/JavaMapWithStateSuite.java:[149] (sizes) LineLength: Line is longer than 100 characters (found 113).
[ERROR] src/test/java/test/org/apache/spark/streaming/Java8APISuite.java:[146] (sizes) LineLength: Line is longer than 100 characters (found 122).
[ERROR] src/test/java/test/org/apache/spark/streaming/JavaAPISuite.java:[32,8] (imports) UnusedImports: Unused import - org.apache.spark.streaming.Time.
[ERROR] src/test/java/test/org/apache/spark/streaming/JavaAPISuite.java:[611] (sizes) LineLength: Line is longer than 100 characters (found 101).
[ERROR] src/test/java/test/org/apache/spark/streaming/JavaAPISuite.java:[1317] (sizes) LineLength: Line is longer than 100 characters (found 102).
[ERROR] src/test/java/test/org/apache/spark/sql/JavaDatasetAggregatorSuite.java:[91] (sizes) LineLength: Line is longer than 100 characters (found 102).
[ERROR] src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java:[113] (sizes) LineLength: Line is longer than 100 characters (found 101).
[ERROR] src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java:[164] (sizes) LineLength: Line is longer than 100 characters (found 110).
[ERROR] src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java:[212] (sizes) LineLength: Line is longer than 100 characters (found 114).
[ERROR] src/test/java/org/apache/spark/mllib/tree/JavaDecisionTreeSuite.java:[36] (sizes) LineLength: Line is longer than 100 characters (found 101).
[ERROR] src/main/java/org/apache/spark/examples/streaming/JavaKinesisWordCountASL.java:[26,8] (imports) UnusedImports: Unused import - com.amazonaws.regions.RegionUtils.
[ERROR] src/test/java/org/apache/spark/streaming/kinesis/JavaKinesisStreamSuite.java:[20,8] (imports) UnusedImports: Unused import - com.amazonaws.regions.RegionUtils.
[ERROR] src/test/java/org/apache/spark/streaming/kinesis/JavaKinesisStreamSuite.java:[94] (sizes) LineLength: Line is longer than 100 characters (found 103).
[ERROR] src/main/java/org/apache/spark/examples/ml/JavaTokenizerExample.java:[30,8] (imports) UnusedImports: Unused import - org.apache.spark.sql.api.java.UDF1.
[ERROR] src/main/java/org/apache/spark/examples/ml/JavaTokenizerExample.java:[72] (sizes) LineLength: Line is longer than 100 characters (found 104).
[ERROR] src/main/java/org/apache/spark/examples/mllib/JavaRankingMetricsExample.java:[121] (sizes) LineLength: Line is longer than 100 characters (found 101).
[ERROR] src/main/java/org/apache/spark/examples/sql/JavaSQLDataSourceExample.java:[28,8] (imports) UnusedImports: Unused import - org.apache.spark.api.java.JavaRDD.
[ERROR] src/main/java/org/apache/spark/examples/sql/JavaSQLDataSourceExample.java:[29,8] (imports) UnusedImports: Unused import - org.apache.spark.api.java.JavaSparkContext.
```

## How was this patch tested?

Manually via

```bash
./dev/lint-java
```

Author: hyukjinkwon <gurwls223@gmail.com>

Closes #17072 from HyukjinKwon/java-lint.

2 files changed, 15 insertions, 13 deletions

diff --git a/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetAggregatorSuite.java b/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetAggregatorSuite.java
index d3769a74b9..539976d5af 100644
--- a/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetAggregatorSuite.java
+++ b/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetAggregatorSuite.java
@@ -88,7 +88,7 @@ public class JavaDatasetAggregatorSuite extends JavaDatasetAggregatorSuiteBase {
   @Test
   public void testTypedAggregationAverage() {
     KeyValueGroupedDataset<String, Tuple2<String, Integer>> grouped = generateGroupedDataset();
-    Dataset<Tuple2<String, Double>> agged = grouped.agg(typed.avg(value -> (double)(value._2() * 2)));
+    Dataset<Tuple2<String, Double>> agged = grouped.agg(typed.avg(value -> value._2() * 2.0));
     Assert.assertEquals(
         Arrays.asList(new Tuple2<>("a", 3.0), new Tuple2<>("b", 6.0)),
         agged.collectAsList());
diff --git a/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java b/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java
index 4581c6ebe9..e3b0e37cca 100644
--- a/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java
+++ b/sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java
@@ -110,7 +110,8 @@ public class JavaDatasetSuite implements Serializable {
     Assert.assertEquals(Arrays.asList("hello"), filtered.collectAsList());
 
 
-    Dataset<Integer> mapped = ds.map((MapFunction<String, Integer>) v -> v.length(), Encoders.INT());
+    Dataset<Integer> mapped =
+      ds.map((MapFunction<String, Integer>) String::length, Encoders.INT());
     Assert.assertEquals(Arrays.asList(5, 5), mapped.collectAsList());
 
     Dataset<String> parMapped = ds.mapPartitions((MapPartitionsFunction<String, String>) it -> {
@@ -157,17 +158,17 @@ public class JavaDatasetSuite implements Serializable {
   public void testGroupBy() {
     List<String> data = Arrays.asList("a", "foo", "bar");
     Dataset<String> ds = spark.createDataset(data, Encoders.STRING());
-    KeyValueGroupedDataset<Integer, String> grouped = ds.groupByKey(
-        (MapFunction<String, Integer>) v -> v.length(),
-      Encoders.INT());
+    KeyValueGroupedDataset<Integer, String> grouped =
+      ds.groupByKey((MapFunction<String, Integer>) String::length, Encoders.INT());
 
-    Dataset<String> mapped = grouped.mapGroups((MapGroupsFunction<Integer, String, String>) (key, values) -> {
-      StringBuilder sb = new StringBuilder(key.toString());
-      while (values.hasNext()) {
-        sb.append(values.next());
-      }
-      return sb.toString();
-    }, Encoders.STRING());
+    Dataset<String> mapped = grouped.mapGroups(
+      (MapGroupsFunction<Integer, String, String>) (key, values) -> {
+        StringBuilder sb = new StringBuilder(key.toString());
+        while (values.hasNext()) {
+          sb.append(values.next());
+        }
+        return sb.toString();
+      }, Encoders.STRING());
 
     Assert.assertEquals(asSet("1a", "3foobar"), toSet(mapped.collectAsList()));
 
@@ -209,7 +210,8 @@ public class JavaDatasetSuite implements Serializable {
 
     Assert.assertEquals(asSet("1a", "3foobar"), toSet(flatMapped2.collectAsList()));
 
-    Dataset<Tuple2<Integer, String>> reduced = grouped.reduceGroups((ReduceFunction<String>) (v1, v2) -> v1 + v2);
+    Dataset<Tuple2<Integer, String>> reduced =
+      grouped.reduceGroups((ReduceFunction<String>) (v1, v2) -> v1 + v2);
 
     Assert.assertEquals(
       asSet(tuple2(1, "a"), tuple2(3, "foobar")),