Incorporated feedback from r718

gson/src/main/java/com/google/gson/ExposeAnnotationDeserializationExclusionStrategy.java

@@ -23,7 +23,7 @@ import com.google.gson.annotations.Expose;
  *
  * @author Joel Leitch
  */
-public class ExposeAnnotationDeserializationExclusionStrategy implements ExclusionStrategy {
+final class ExposeAnnotationDeserializationExclusionStrategy implements ExclusionStrategy {
   public boolean shouldSkipClass(Class<?> clazz) {
     return false;
   }

gson/src/main/java/com/google/gson/ExposeAnnotationSerializationExclusionStrategy.java

@@ -23,7 +23,7 @@ import com.google.gson.annotations.Expose;
  *
  * @author Joel Leitch
  */
-public class ExposeAnnotationSerializationExclusionStrategy implements ExclusionStrategy {
+final class ExposeAnnotationSerializationExclusionStrategy implements ExclusionStrategy {
   public boolean shouldSkipClass(Class<?> clazz) {
     return false;
   }

gson/src/main/java/com/google/gson/InnerClassExclusionStrategy.java

@@ -23,7 +23,7 @@ import java.lang.reflect.Modifier;
  *
  * @author Joel Leitch
  */
-class InnerClassExclusionStrategy implements ExclusionStrategy {
+final class InnerClassExclusionStrategy implements ExclusionStrategy {
 
   public boolean shouldSkipField(FieldAttributes f) {
     return isInnerClass(f.getDeclaredClass());

gson/src/main/java/com/google/gson/SyntheticFieldExclusionStrategy.java

@@ -26,7 +26,7 @@ package com.google.gson;
  *
  * @since 1.4
  */
-class SyntheticFieldExclusionStrategy implements ExclusionStrategy {
+final class SyntheticFieldExclusionStrategy implements ExclusionStrategy {
   private final boolean skipSyntheticFields;
 
   SyntheticFieldExclusionStrategy(boolean skipSyntheticFields) {

gson/src/test/java/com/google/gson/MockExclusionStrategy.java

@@ -22,7 +22,7 @@ package com.google.gson;
  *
  * @author Joel Leitch
  */
-public class MockExclusionStrategy implements ExclusionStrategy {
+final class MockExclusionStrategy implements ExclusionStrategy {
   private final boolean skipClass;
   private final boolean skipField;