diff --git a/gson/src/main/java/com/google/gson/Gson.java b/gson/src/main/java/com/google/gson/Gson.java
index 106bc75d..e45ac2f4 100644
--- a/gson/src/main/java/com/google/gson/Gson.java
+++ b/gson/src/main/java/com/google/gson/Gson.java
@@ -111,6 +111,10 @@ public final class Gson {
   static final boolean DEFAULT_COMPLEX_MAP_KEYS = false;
   static final boolean DEFAULT_SPECIALIZE_FLOAT_VALUES = false;
   static final boolean DEFAULT_USE_JDK_UNSAFE = true;
+  static final String DEFAULT_DATE_PATTERN = null;
+  static final FieldNamingStrategy DEFAULT_FIELD_NAMING_STRATEGY = FieldNamingPolicy.IDENTITY;
+  static final ToNumberStrategy DEFAULT_OBJECT_TO_NUMBER_STRATEGY = ToNumberPolicy.DOUBLE;
+  static final ToNumberStrategy DEFAULT_NUMBER_TO_NUMBER_STRATEGY = ToNumberPolicy.LAZILY_PARSED_NUMBER;
 
   private static final TypeToken<?> NULL_KEY_SURROGATE = TypeToken.get(Object.class);
   private static final String JSON_NON_EXECUTABLE_PREFIX = ")]}'\n";
@@ -187,14 +191,14 @@ public final class Gson {
    * </ul>
    */
   public Gson() {
-    this(Excluder.DEFAULT, FieldNamingPolicy.IDENTITY,
+    this(Excluder.DEFAULT, DEFAULT_FIELD_NAMING_STRATEGY,
         Collections.<Type, InstanceCreator<?>>emptyMap(), DEFAULT_SERIALIZE_NULLS,
         DEFAULT_COMPLEX_MAP_KEYS, DEFAULT_JSON_NON_EXECUTABLE, DEFAULT_ESCAPE_HTML,
         DEFAULT_PRETTY_PRINT, DEFAULT_LENIENT, DEFAULT_SPECIALIZE_FLOAT_VALUES,
         DEFAULT_USE_JDK_UNSAFE,
-        LongSerializationPolicy.DEFAULT, null, DateFormat.DEFAULT, DateFormat.DEFAULT,
+        LongSerializationPolicy.DEFAULT, DEFAULT_DATE_PATTERN, DateFormat.DEFAULT, DateFormat.DEFAULT,
         Collections.<TypeAdapterFactory>emptyList(), Collections.<TypeAdapterFactory>emptyList(),
-        Collections.<TypeAdapterFactory>emptyList(), ToNumberPolicy.DOUBLE, ToNumberPolicy.LAZILY_PARSED_NUMBER);
+        Collections.<TypeAdapterFactory>emptyList(), DEFAULT_OBJECT_TO_NUMBER_STRATEGY, DEFAULT_NUMBER_TO_NUMBER_STRATEGY);
   }
 
   Gson(Excluder excluder, FieldNamingStrategy fieldNamingStrategy,
diff --git a/gson/src/main/java/com/google/gson/GsonBuilder.java b/gson/src/main/java/com/google/gson/GsonBuilder.java
index 3fb9e410..43318fb3 100644
--- a/gson/src/main/java/com/google/gson/GsonBuilder.java
+++ b/gson/src/main/java/com/google/gson/GsonBuilder.java
@@ -35,9 +35,12 @@ import com.google.gson.reflect.TypeToken;
 import com.google.gson.stream.JsonReader;
 
 import static com.google.gson.Gson.DEFAULT_COMPLEX_MAP_KEYS;
+import static com.google.gson.Gson.DEFAULT_DATE_PATTERN;
 import static com.google.gson.Gson.DEFAULT_ESCAPE_HTML;
 import static com.google.gson.Gson.DEFAULT_JSON_NON_EXECUTABLE;
 import static com.google.gson.Gson.DEFAULT_LENIENT;
+import static com.google.gson.Gson.DEFAULT_NUMBER_TO_NUMBER_STRATEGY;
+import static com.google.gson.Gson.DEFAULT_OBJECT_TO_NUMBER_STRATEGY;
 import static com.google.gson.Gson.DEFAULT_PRETTY_PRINT;
 import static com.google.gson.Gson.DEFAULT_SERIALIZE_NULLS;
 import static com.google.gson.Gson.DEFAULT_SPECIALIZE_FLOAT_VALUES;
@@ -86,7 +89,7 @@ public final class GsonBuilder {
   /** tree-style hierarchy factories. These come after factories for backwards compatibility. */
   private final List<TypeAdapterFactory> hierarchyFactories = new ArrayList<TypeAdapterFactory>();
   private boolean serializeNulls = DEFAULT_SERIALIZE_NULLS;
-  private String datePattern;
+  private String datePattern = DEFAULT_DATE_PATTERN;
   private int dateStyle = DateFormat.DEFAULT;
   private int timeStyle = DateFormat.DEFAULT;
   private boolean complexMapKeySerialization = DEFAULT_COMPLEX_MAP_KEYS;
@@ -96,8 +99,8 @@ public final class GsonBuilder {
   private boolean generateNonExecutableJson = DEFAULT_JSON_NON_EXECUTABLE;
   private boolean lenient = DEFAULT_LENIENT;
   private boolean useJdkUnsafe = DEFAULT_USE_JDK_UNSAFE;
-  private ToNumberStrategy objectToNumberStrategy = ToNumberPolicy.DOUBLE;
-  private ToNumberStrategy numberToNumberStrategy = ToNumberPolicy.LAZILY_PARSED_NUMBER;
+  private ToNumberStrategy objectToNumberStrategy = DEFAULT_OBJECT_TO_NUMBER_STRATEGY;
+  private ToNumberStrategy numberToNumberStrategy = DEFAULT_NUMBER_TO_NUMBER_STRATEGY;
 
   /**
    * Creates a GsonBuilder instance that can be used to build Gson with various configuration