[SPARK-21875][BUILD] Fix Java style bugs

core/src/main/java/org/apache/spark/memory/TaskMemoryManager.java

@@ -74,7 +74,8 @@ public class TaskMemoryManager {
    * Maximum supported data page size (in bytes). In principle, the maximum addressable page size is
    * (1L << OFFSET_BITS) bytes, which is 2+ petabytes. However, the on-heap allocator's
    * maximum page size is limited by the maximum amount of data that can be stored in a long[]
-   * array, which is (2^31 - 1) * 8 bytes (or about 17 gigabytes). Therefore, we cap this at 17 gigabytes.
+   * array, which is (2^31 - 1) * 8 bytes (or about 17 gigabytes). Therefore, we cap this at 17
+   * gigabytes.
    */
   public static final long MAXIMUM_PAGE_SIZE_BYTES = ((1L << 31) - 1) * 8L;
 

sql/core/src/test/java/test/org/apache/spark/sql/JavaDatasetSuite.java

@@ -1337,7 +1337,8 @@ public String toString() {
     public boolean equals(Object other) {
       if (other instanceof BeanWithEnum) {
         BeanWithEnum beanWithEnum = (BeanWithEnum) other;
-        return beanWithEnum.regularField.equals(regularField) && beanWithEnum.enumField.equals(enumField);
+        return beanWithEnum.regularField.equals(regularField)
+          && beanWithEnum.enumField.equals(enumField);
       }
       return false;
     }