diff --git a/src/main/java/org/apache/datasketches/theta/Union.java b/src/main/java/org/apache/datasketches/theta/Union.java
index 96ea6d273..7a2ff9c5b 100644
--- a/src/main/java/org/apache/datasketches/theta/Union.java
+++ b/src/main/java/org/apache/datasketches/theta/Union.java
@@ -19,12 +19,12 @@
 
 package org.apache.datasketches.theta;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.common.Family;
 import org.apache.datasketches.memory.Memory;
 import org.apache.datasketches.memory.WritableMemory;
 
-import java.nio.ByteBuffer;
-
 /**
  * Compute the union of two or more theta sketches.
  * A new instance represents an empty set.
diff --git a/src/main/java/org/apache/datasketches/theta/UnionImpl.java b/src/main/java/org/apache/datasketches/theta/UnionImpl.java
index 8516ec011..3ea5ca557 100644
--- a/src/main/java/org/apache/datasketches/theta/UnionImpl.java
+++ b/src/main/java/org/apache/datasketches/theta/UnionImpl.java
@@ -38,6 +38,8 @@
 import static org.apache.datasketches.theta.SingleItemSketch.otherCheckForSingleItem;
 import static org.apache.datasketches.thetacommon.QuickSelect.selectExcludingZeros;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.common.Family;
 import org.apache.datasketches.common.ResizeFactor;
 import org.apache.datasketches.common.SketchesArgumentException;
@@ -47,8 +49,6 @@
 import org.apache.datasketches.thetacommon.HashOperations;
 import org.apache.datasketches.thetacommon.ThetaUtil;
 
-import java.nio.ByteBuffer;
-
 /**
  * Shared code for the HeapUnion and DirectUnion implementations.
  *
@@ -483,7 +483,7 @@ public void update(final byte[] data) {
   }
 
   @Override
-  public void update(ByteBuffer data) {
+  public void update(final ByteBuffer data) {
     gadget_.update(data);
   }
 
diff --git a/src/main/java/org/apache/datasketches/theta/UpdateSketch.java b/src/main/java/org/apache/datasketches/theta/UpdateSketch.java
index 02fb599d6..882c5e2e9 100644
--- a/src/main/java/org/apache/datasketches/theta/UpdateSketch.java
+++ b/src/main/java/org/apache/datasketches/theta/UpdateSketch.java
@@ -284,7 +284,7 @@ public UpdateReturnState update(final byte[] data) {
    * @return
    * <a href="{@docRoot}/resources/dictionary.html#updateReturnState">See Update Return State</a>
    */
-  public UpdateReturnState update(ByteBuffer buffer) {
+  public UpdateReturnState update(final ByteBuffer buffer) {
     if (buffer == null || buffer.hasRemaining() == false) {
       return RejectedNullOrEmpty;
     }
diff --git a/src/main/java/org/apache/datasketches/tuple/UpdatableSketch.java b/src/main/java/org/apache/datasketches/tuple/UpdatableSketch.java
index 6a386661c..36743618b 100644
--- a/src/main/java/org/apache/datasketches/tuple/UpdatableSketch.java
+++ b/src/main/java/org/apache/datasketches/tuple/UpdatableSketch.java
@@ -19,12 +19,12 @@
 
 package org.apache.datasketches.tuple;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.hash.MurmurHash3;
 import org.apache.datasketches.memory.Memory;
 import org.apache.datasketches.thetacommon.ThetaUtil;
 
-import java.nio.ByteBuffer;
-
 /**
  * An extension of QuickSelectSketch&lt;S&gt;, which can be updated with many types of keys.
  * Summary objects are created using a user-defined SummaryFactory class,
diff --git a/src/main/java/org/apache/datasketches/tuple/arrayofdoubles/ArrayOfDoublesUpdatableSketch.java b/src/main/java/org/apache/datasketches/tuple/arrayofdoubles/ArrayOfDoublesUpdatableSketch.java
index 4febb1172..cd3c1d2e7 100644
--- a/src/main/java/org/apache/datasketches/tuple/arrayofdoubles/ArrayOfDoublesUpdatableSketch.java
+++ b/src/main/java/org/apache/datasketches/tuple/arrayofdoubles/ArrayOfDoublesUpdatableSketch.java
@@ -19,6 +19,8 @@
 
 package org.apache.datasketches.tuple.arrayofdoubles;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.common.ResizeFactor;
 import org.apache.datasketches.hash.MurmurHash3;
 import org.apache.datasketches.memory.Memory;
@@ -26,8 +28,6 @@
 import org.apache.datasketches.thetacommon.ThetaUtil;
 import org.apache.datasketches.tuple.Util;
 
-import java.nio.ByteBuffer;
-
 /**
  * The top level for updatable tuple sketches of type ArrayOfDoubles.
  */
diff --git a/src/test/java/org/apache/datasketches/theta/UpdateSketchTest.java b/src/test/java/org/apache/datasketches/theta/UpdateSketchTest.java
index 331d6e222..76f4707aa 100644
--- a/src/test/java/org/apache/datasketches/theta/UpdateSketchTest.java
+++ b/src/test/java/org/apache/datasketches/theta/UpdateSketchTest.java
@@ -30,19 +30,17 @@
 import static org.testng.Assert.assertTrue;
 import static org.testng.Assert.fail;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.common.Family;
 import org.apache.datasketches.common.ResizeFactor;
 import org.apache.datasketches.common.SketchesArgumentException;
 import org.apache.datasketches.memory.DefaultMemoryRequestServer;
-import org.apache.datasketches.memory.Memory;
 import org.apache.datasketches.memory.MemoryRequestServer;
 import org.apache.datasketches.memory.WritableMemory;
 import org.apache.datasketches.thetacommon.ThetaUtil;
 import org.testng.annotations.Test;
 
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-
 /**
  * @author Lee Rhodes
  */
diff --git a/src/test/java/org/apache/datasketches/tuple/adouble/AdoubleTest.java b/src/test/java/org/apache/datasketches/tuple/adouble/AdoubleTest.java
index a853b6da3..a1cfc1a7d 100644
--- a/src/test/java/org/apache/datasketches/tuple/adouble/AdoubleTest.java
+++ b/src/test/java/org/apache/datasketches/tuple/adouble/AdoubleTest.java
@@ -21,21 +21,20 @@
 
 import static org.testng.Assert.assertEquals;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.common.ResizeFactor;
 import org.apache.datasketches.common.SketchesArgumentException;
 import org.apache.datasketches.memory.Memory;
 import org.apache.datasketches.tuple.Sketch;
-import org.apache.datasketches.tuple.TupleSketchIterator;
 import org.apache.datasketches.tuple.Sketches;
+import org.apache.datasketches.tuple.TupleSketchIterator;
 import org.apache.datasketches.tuple.UpdatableSketch;
 import org.apache.datasketches.tuple.UpdatableSketchBuilder;
 import org.apache.datasketches.tuple.adouble.DoubleSummary.Mode;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-
 public class AdoubleTest {
   private final DoubleSummary.Mode mode = Mode.Sum;
 
diff --git a/src/test/java/org/apache/datasketches/tuple/arrayofdoubles/DirectArrayOfDoublesQuickSelectSketchTest.java b/src/test/java/org/apache/datasketches/tuple/arrayofdoubles/DirectArrayOfDoublesQuickSelectSketchTest.java
index dfb0c1fda..a8e066f4d 100644
--- a/src/test/java/org/apache/datasketches/tuple/arrayofdoubles/DirectArrayOfDoublesQuickSelectSketchTest.java
+++ b/src/test/java/org/apache/datasketches/tuple/arrayofdoubles/DirectArrayOfDoublesQuickSelectSketchTest.java
@@ -19,16 +19,14 @@
 
 package org.apache.datasketches.tuple.arrayofdoubles;
 
+import java.nio.ByteBuffer;
+
 import org.apache.datasketches.common.ResizeFactor;
 import org.apache.datasketches.common.SketchesArgumentException;
-import org.apache.datasketches.memory.Memory;
 import org.apache.datasketches.memory.WritableMemory;
 import org.testng.Assert;
 import org.testng.annotations.Test;
 
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-
 public class DirectArrayOfDoublesQuickSelectSketchTest {
   @Test
   public void isEmpty() {