diff --git a/src/main/java/graphql/schema/GraphQLEnumType.java b/src/main/java/graphql/schema/GraphQLEnumType.java
index b7a87198fd..9a1cb8abdc 100644
--- a/src/main/java/graphql/schema/GraphQLEnumType.java
+++ b/src/main/java/graphql/schema/GraphQLEnumType.java
@@ -46,7 +46,7 @@ public List<GraphQLEnumValueDefinition> getValues() {
 
 
     public GraphQLEnumType(String name, String description, List<GraphQLEnumValueDefinition> values) {
-        assertNotNull(name, "name can't be null");
+        assertNotNull(name, "name can't null");
         this.name = name;
         this.description = description;
         buildMap(values);
@@ -58,10 +58,6 @@ private void buildMap(List<GraphQLEnumValueDefinition> values) {
         }
     }
 
-    public String getName() {
-        return name;
-    }
-
     public String getDescription() {
         return description;
     }
@@ -75,6 +71,26 @@ public static Builder newEnum() {
         return new Builder();
     }
 
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
     public static class Builder {
 
         private String name;
diff --git a/src/main/java/graphql/schema/GraphQLInputObjectType.java b/src/main/java/graphql/schema/GraphQLInputObjectType.java
index ffb906ca36..9f35b3342b 100644
--- a/src/main/java/graphql/schema/GraphQLInputObjectType.java
+++ b/src/main/java/graphql/schema/GraphQLInputObjectType.java
@@ -8,16 +8,14 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLInputObjectType implements GraphQLType, GraphQLInputType, GraphQLUnmodifiedType, GraphQLNullableType {
+public class GraphQLInputObjectType implements GraphQLInputType, GraphQLUnmodifiedType, GraphQLNullableType {
 
     private final String name;
     private final String description;
-
-
     private final Map<String, GraphQLInputObjectField> fieldMap = new LinkedHashMap<>();
 
     public GraphQLInputObjectType(String name, String description, List<GraphQLInputObjectField> fields) {
-        assertNotNull(name, "name can't be null");
+        assertNotNull(name, "name can't null");
         assertNotNull(fields, "fields can't be null");
         this.name = name;
         this.description = description;
@@ -30,10 +28,6 @@ private void buildMap(List<GraphQLInputObjectField> fields) {
         }
     }
 
-    public String getName() {
-        return name;
-    }
-
     public String getDescription() {
         return description;
     }
@@ -50,6 +44,26 @@ public static Builder newInputObject() {
         return new Builder();
     }
 
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
     public static class Builder {
         private String name;
         private String description;
diff --git a/src/main/java/graphql/schema/GraphQLInterfaceType.java b/src/main/java/graphql/schema/GraphQLInterfaceType.java
index 07c5bd276c..1119da467b 100644
--- a/src/main/java/graphql/schema/GraphQLInterfaceType.java
+++ b/src/main/java/graphql/schema/GraphQLInterfaceType.java
@@ -8,7 +8,7 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLInterfaceType implements GraphQLType, GraphQLOutputType, GraphQLFieldsContainer, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {
+public class GraphQLInterfaceType implements GraphQLOutputType, GraphQLFieldsContainer, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {
 
     private final String name;
     private final String description;
@@ -40,10 +40,6 @@ public List<GraphQLFieldDefinition> getFieldDefinitions() {
         return new ArrayList<>(fieldDefinitionsByName.values());
     }
 
-    public String getName() {
-        return name;
-    }
-
     public String getDescription() {
         return description;
     }
@@ -55,7 +51,7 @@ public TypeResolver getTypeResolver() {
     @Override
     public String toString() {
         return "GraphQLInterfaceType{" +
-                "name='" + name + '\'' +
+                "name='" + getName() + '\'' +
                 ", description='" + description + '\'' +
                 ", fieldDefinitionsByName=" + fieldDefinitionsByName +
                 ", typeResolver=" + typeResolver +
@@ -66,6 +62,26 @@ public static Builder newInterface() {
         return new Builder();
     }
 
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
 
     public static class Builder {
         private String name;
diff --git a/src/main/java/graphql/schema/GraphQLList.java b/src/main/java/graphql/schema/GraphQLList.java
index 3368b5f3dc..8e8b185c88 100644
--- a/src/main/java/graphql/schema/GraphQLList.java
+++ b/src/main/java/graphql/schema/GraphQLList.java
@@ -5,7 +5,7 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLList implements GraphQLType, GraphQLInputType, GraphQLOutputType, GraphQLModifiedType, GraphQLNullableType {
+public class GraphQLList implements GraphQLInputType, GraphQLOutputType, GraphQLModifiedType, GraphQLNullableType {
 
     private GraphQLType wrappedType;
 
@@ -39,7 +39,6 @@ public int hashCode() {
         return wrappedType != null ? wrappedType.hashCode() : 0;
     }
 
-    @Override
     public String getName() {
         return null;
     }
diff --git a/src/main/java/graphql/schema/GraphQLNonNull.java b/src/main/java/graphql/schema/GraphQLNonNull.java
index 141e24d29f..fc3fe7cf78 100644
--- a/src/main/java/graphql/schema/GraphQLNonNull.java
+++ b/src/main/java/graphql/schema/GraphQLNonNull.java
@@ -5,7 +5,7 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLNonNull implements GraphQLType, GraphQLInputType, GraphQLOutputType, GraphQLModifiedType {
+public class GraphQLNonNull implements GraphQLInputType, GraphQLOutputType, GraphQLModifiedType {
 
     private  GraphQLType wrappedType;
 
diff --git a/src/main/java/graphql/schema/GraphQLObjectType.java b/src/main/java/graphql/schema/GraphQLObjectType.java
index a7890af6cc..00a4ae16d0 100644
--- a/src/main/java/graphql/schema/GraphQLObjectType.java
+++ b/src/main/java/graphql/schema/GraphQLObjectType.java
@@ -8,7 +8,7 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLObjectType implements GraphQLType, GraphQLOutputType, GraphQLFieldsContainer, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {
+public class GraphQLObjectType implements GraphQLOutputType, GraphQLFieldsContainer, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {
 
     private final String name;
     private final String description;
@@ -50,16 +50,10 @@ public String getDescription() {
         return description;
     }
 
-
-    public String getName() {
-        return name;
-    }
-
-
     @Override
     public String toString() {
         return "GraphQLObjectType{" +
-                "name='" + name + '\'' +
+                "name='" + getName() + '\'' +
                 ", description='" + description + '\'' +
                 ", fieldDefinitionsByName=" + fieldDefinitionsByName +
                 ", interfaces=" + interfaces +
@@ -70,6 +64,26 @@ public static Builder newObject() {
         return new Builder();
     }
 
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
 
     public static class Builder {
         private String name;
diff --git a/src/main/java/graphql/schema/GraphQLScalarType.java b/src/main/java/graphql/schema/GraphQLScalarType.java
index 0e2ccead8d..5eacf59536 100644
--- a/src/main/java/graphql/schema/GraphQLScalarType.java
+++ b/src/main/java/graphql/schema/GraphQLScalarType.java
@@ -3,25 +3,20 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLScalarType implements GraphQLType, GraphQLInputType, GraphQLOutputType, GraphQLUnmodifiedType,GraphQLNullableType {
+public class GraphQLScalarType implements GraphQLInputType, GraphQLOutputType, GraphQLUnmodifiedType,GraphQLNullableType {
 
     private final String name;
     private final String description;
     private final Coercing coercing;
 
-
     public GraphQLScalarType(String name, String description, Coercing coercing) {
-        assertNotNull(name, "name can't be null");
+        assertNotNull(name, "name can't null");
         assertNotNull(coercing, "coercing can't be null");
         this.name = name;
         this.description = description;
         this.coercing = coercing;
     }
 
-    public String getName() {
-        return name;
-    }
-
 
     public String getDescription() {
         return description;
@@ -35,9 +30,29 @@ public Coercing getCoercing() {
     @Override
     public String toString() {
         return "GraphQLScalarType{" +
-                "name='" + name + '\'' +
+                "name='" + getName() + '\'' +
                 ", description='" + description + '\'' +
                 ", coercing=" + coercing +
                 '}';
     }
+
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
 }
diff --git a/src/main/java/graphql/schema/GraphQLTypeReference.java b/src/main/java/graphql/schema/GraphQLTypeReference.java
index 103e326f26..0b2c01d1b6 100644
--- a/src/main/java/graphql/schema/GraphQLTypeReference.java
+++ b/src/main/java/graphql/schema/GraphQLTypeReference.java
@@ -7,16 +7,32 @@
  * A special type to allow a object/interface types to reference itself. It's replaced with the real type
  * object when the schema is build.
  */
-public class GraphQLTypeReference implements GraphQLType, GraphQLOutputType {
+public class GraphQLTypeReference implements GraphQLOutputType {
 
     private final String name;
 
     public GraphQLTypeReference(String name) {
-        assertNotNull(name, "name can't be null");
+        assertNotNull(name, "name can't null");
         this.name = name;
     }
 
     public String getName() {
         return name;
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
 }
diff --git a/src/main/java/graphql/schema/GraphQLUnionType.java b/src/main/java/graphql/schema/GraphQLUnionType.java
index 710041e600..ac67098e7b 100644
--- a/src/main/java/graphql/schema/GraphQLUnionType.java
+++ b/src/main/java/graphql/schema/GraphQLUnionType.java
@@ -6,7 +6,7 @@
 
 import static graphql.Assert.assertNotNull;
 
-public class GraphQLUnionType implements GraphQLType, GraphQLOutputType, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {
+public class GraphQLUnionType implements GraphQLOutputType, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {
 
     private final String name;
     private final String description;
@@ -15,7 +15,7 @@ public class GraphQLUnionType implements GraphQLType, GraphQLOutputType, GraphQL
 
 
     public GraphQLUnionType(String name, String description, List<GraphQLType> types, TypeResolver typeResolver) {
-        assertNotNull(name, "name can't be null");
+        assertNotNull(name, "name can't null");
         assertNotNull(types, "types can't be null");
         assertNotNull(typeResolver, "typeResolver can't be null");
         this.name = name;
@@ -33,11 +33,6 @@ public TypeResolver getTypeResolver() {
         return typeResolver;
     }
 
-    @Override
-    public String getName() {
-        return name;
-    }
-
     public String getDescription() {
         return description;
     }
@@ -46,6 +41,26 @@ public static Builder newUnionType() {
         return new Builder();
     }
 
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GraphQLType that = (GraphQLType) o;
+
+        return getName().equals(that.getName());
+
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
     public static class Builder {
         private String name;
         private String description;