Removed all the JDK warnings about unused fields in test classes or unused constructors for use by Gson or instanceof calls on parameterized types.

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

@@ -320,15 +320,15 @@ public final class GsonBuilder {
    * @return a reference to this {@code GsonBuilder} object to fulfill the "Builder" pattern
    */
   public GsonBuilder registerTypeAdapter(Type type, Object typeAdapter) {
-    Preconditions.checkArgument(typeAdapter instanceof JsonSerializer
-        || typeAdapter instanceof JsonDeserializer || typeAdapter instanceof InstanceCreator);
-    if (typeAdapter instanceof InstanceCreator) {
+    Preconditions.checkArgument(typeAdapter instanceof JsonSerializer<?>
+        || typeAdapter instanceof JsonDeserializer<?> || typeAdapter instanceof InstanceCreator<?>);
+    if (typeAdapter instanceof InstanceCreator<?>) {
       registerInstanceCreator(type, (InstanceCreator<?>) typeAdapter);
     }
-    if (typeAdapter instanceof JsonSerializer) {
+    if (typeAdapter instanceof JsonSerializer<?>) {
       registerSerializer(type, (JsonSerializer<?>) typeAdapter);
     }
-    if (typeAdapter instanceof JsonDeserializer) {
+    if (typeAdapter instanceof JsonDeserializer<?>) {
       registerDeserializer(type, (JsonDeserializer<?>) typeAdapter);
     }
     return this;

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

@@ -57,7 +57,7 @@ final class TypeInfoFactory {
 
   private static Type getActualType(
       Type typeToEvaluate, Type parentType, Class<?> rawParentClass) {
-    if (typeToEvaluate instanceof Class) {
+    if (typeToEvaluate instanceof Class<?>) {
       return typeToEvaluate;
     } else if (typeToEvaluate instanceof ParameterizedType) {
       ParameterizedType castedType = (ParameterizedType) typeToEvaluate;
@@ -73,13 +73,13 @@ final class TypeInfoFactory {
       if (componentType.equals(actualType)) {
         return castedType;
       } else {
-        if (actualType instanceof Class) {
+        if (actualType instanceof Class<?>) {
           return TypeUtils.wrapWithArray(TypeUtils.toRawClass(actualType));
         } else {
           return new GenericArrayTypeImpl(actualType);
         }
       }
-    } else if (typeToEvaluate instanceof TypeVariable) {
+    } else if (typeToEvaluate instanceof TypeVariable<?>) {
       if (parentType instanceof ParameterizedType) {
         // The class definition has the actual types used for the type variables.
         // Find the matching actual type for the Type Variable used for the field.

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

@@ -32,7 +32,7 @@ final class TypeInfoMap {
   private final Type valueType;
   
   public TypeInfoMap(Type mapType) {
-    if (mapType instanceof Class && Properties.class.isAssignableFrom((Class<?>) mapType)) {
+    if (mapType instanceof Class<?> && Properties.class.isAssignableFrom((Class<?>) mapType)) {
       keyType = String.class;
       valueType = String.class;
     } else if (mapType instanceof ParameterizedType) {

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

@@ -41,7 +41,7 @@ final class TypeUtils {
    * <code>TypeUtils.getActualTypeForFirstTypeVariable(fooType)</code> will return Integer.class.
    */
   static Type getActualTypeForFirstTypeVariable(Type type) {
-    if (type instanceof Class) {
+    if (type instanceof Class<?>) {
       return Object.class;
     } else if (type instanceof ParameterizedType) {
       return ((ParameterizedType)type).getActualTypeArguments()[0];
@@ -54,7 +54,7 @@ final class TypeUtils {
   }
 
   static boolean isArray(Type type) {
-    if (type instanceof Class) {
+    if (type instanceof Class<?>) {
       return ((Class<?>)type).isArray();
     } else if (type instanceof GenericArrayType) {
       return true;
@@ -67,7 +67,7 @@ final class TypeUtils {
    * This method returns the actual raw class associated with the specified type.
    */
   static Class<?> toRawClass(Type type) {
-    if (type instanceof Class) {
+    if (type instanceof Class<?>) {
       return (Class<?>) type;
     } else if (type instanceof ParameterizedType) {
       ParameterizedType actualType = (ParameterizedType)type;

gson/src/main/java/com/google/gson/reflect/TypeToken.java

@@ -87,7 +87,7 @@ public abstract class TypeToken<T> {
    */
   static Type getSuperclassTypeParameter(Class<?> subclass) {
     Type superclass = subclass.getGenericSuperclass();
-    if (superclass instanceof Class) {
+    if (superclass instanceof Class<?>) {
       throw new RuntimeException("Missing type parameter.");
     }
     return ((ParameterizedType) superclass).getActualTypeArguments()[0];
@@ -163,7 +163,7 @@ public abstract class TypeToken<T> {
       return true;
     }
 
-    if (type instanceof Class) {
+    if (type instanceof Class<?>) {
       return rawType.isAssignableFrom(getRawType(from));
     } else if (type instanceof ParameterizedType) {
       return isAssignableFrom(from, (ParameterizedType) type,
@@ -194,7 +194,7 @@ public abstract class TypeToken<T> {
       Type t = from;
       if (from instanceof GenericArrayType) {
         t = ((GenericArrayType) from).getGenericComponentType();
-      } else if (from instanceof Class) {
+      } else if (from instanceof Class<?>) {
         Class<?> classType = (Class<?>) from;
         while (classType.isArray()) {
           classType = classType.getComponentType();
@@ -238,7 +238,7 @@ public abstract class TypeToken<T> {
       for (int i = 0; i < tArgs.length; i++) {
         Type arg = tArgs[i];
         TypeVariable<?> var = tParams[i];
-        while (arg instanceof TypeVariable) {
+        while (arg instanceof TypeVariable<?>) {
           TypeVariable<?> v = (TypeVariable<?>) arg;
           arg = typeVarMap.get(v.getName());
         }
@@ -293,7 +293,7 @@ public abstract class TypeToken<T> {
       Map<String, Type> typeMap) {
     if (to.equals(from)) return true;
 
-    if (from instanceof TypeVariable) {
+    if (from instanceof TypeVariable<?>) {
       return to.equals(typeMap.get(((TypeVariable<?>)from).getName()));
     }
 

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

@@ -51,6 +51,7 @@ public class ExposeAnnotationBasedExclusionStrategyTest extends TestCase {
     assertFalse(strategy.shouldSkipField(f));
   }
 
+  @SuppressWarnings("unused")
   private static class MockObject {
     @Expose
     public final int exposedField = 0;

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

@@ -53,6 +53,7 @@ public class SerializedNameAnnotationInterceptingNamingPolicyTest extends TestCa
     assertEquals(fieldName, policy.translateName(f));
   }
 
+  @SuppressWarnings("unused")
   private static class SomeObject {
     @SerializedName(ANNOTATED_FIELD_NAME) public final int fieldWithAnnotation = 1;
     public final int fieldWithoutAnnotation = 1;

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

@@ -223,6 +223,7 @@ public class TypeInfoFactoryTest extends TestCase {
     assertEquals(List[].class, typeInfo.getRawClass());
   }
 
+  @SuppressWarnings("unused")
   private static class ObjectWithDifferentFields<T> {
     public static enum TestEnum {
       TEST_1, TEST_2;

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

@@ -67,6 +67,7 @@ public class VersionExclusionStrategyTest extends TestCase {
   @Since(VERSION)
   private static class MockObject {
 
+    @SuppressWarnings("unused")
     @Since(VERSION)
     public final int someField = 0;
   }

gson/src/test/java/com/google/gson/functional/CollectionTest.java

@@ -283,7 +283,8 @@ public class CollectionTest extends TestCase {
   private static class ObjectWithWildcardCollection {
     private final Collection<? extends BagOfPrimitives> collection;
 
-    @SuppressWarnings("unchecked")
+    // For use by Gson
+    @SuppressWarnings({ "unchecked", "unused" })
     public ObjectWithWildcardCollection() {
       this(Collections.EMPTY_LIST);
     }
@@ -300,7 +301,8 @@ public class CollectionTest extends TestCase {
   private static class Entry {
     int value;
     // For use by Gson
-    Entry() {
+    @SuppressWarnings("unused")
+    private Entry() {
       this(10);
     }
     Entry(int value) {

gson/src/test/java/com/google/gson/functional/ConcurrencyTest.java

@@ -120,7 +120,8 @@ public class ConcurrencyTest extends TestCase {
     finishedLatch.await();
     assertFalse(failed.get());
   }
-
+  
+  @SuppressWarnings("unused")
   private static class MyObject {
     String a;
     String b;

gson/src/test/java/com/google/gson/functional/CustomDeserializerTest.java

@@ -65,7 +65,9 @@ public class CustomDeserializerTest extends TestCase {
   private static class DataHolder {
     private final String data;
 
-    public DataHolder() {
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private DataHolder() {
       throw new IllegalStateException();
     }
     
@@ -81,7 +83,9 @@ public class CustomDeserializerTest extends TestCase {
   private static class DataHolderWrapper {
     private final DataHolder wrappedData;
     
-    public DataHolderWrapper() {
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private DataHolderWrapper() {
       this(new DataHolder(DEFAULT_VALUE));
     }
     

gson/src/test/java/com/google/gson/functional/CustomTypeAdaptersTest.java

@@ -169,6 +169,7 @@ public class CustomTypeAdaptersTest extends TestCase {
   }
   
   private static class Derived extends Base {
+    @SuppressWarnings("unused")
     int derivedValue = 3;
   }
   

gson/src/test/java/com/google/gson/functional/DefaultTypeAdaptersTest.java

@@ -289,7 +289,9 @@ public class DefaultTypeAdaptersTest extends TestCase {
   
   private static class ClassWithBigDecimal {
     BigDecimal value;
-    ClassWithBigDecimal() { }
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private ClassWithBigDecimal() { }
     ClassWithBigDecimal(String value) {
       this.value = new BigDecimal(value);
     }
@@ -300,7 +302,9 @@ public class DefaultTypeAdaptersTest extends TestCase {
 
   private static class ClassWithBigInteger {
     BigInteger value;
-    ClassWithBigInteger() { }
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private ClassWithBigInteger() { }
     ClassWithBigInteger(String value) {
       this.value = new BigInteger(value);
     }

gson/src/test/java/com/google/gson/functional/ExposeFieldsTest.java

@@ -110,6 +110,7 @@ public class ExposeFieldsTest extends TestCase {
     assertNotNull(obj.interfaceField);
   }
 
+  @SuppressWarnings("unused")
   private static class ClassWithExposedFields {
     @Expose private final Integer a;
     private final Integer b;
@@ -117,7 +118,8 @@ public class ExposeFieldsTest extends TestCase {
     @Expose(deserialize = false) final double d;
     @Expose(serialize = false, deserialize = false) final char e;
 
-    ClassWithExposedFields() {
+    // For use by Gson
+    private ClassWithExposedFields() {
       this(null, null);
     }
 
@@ -166,7 +168,9 @@ public class ExposeFieldsTest extends TestCase {
     @Expose
     private final SomeInterface interfaceField;
 
-    public ClassWithInterfaceField() {
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private ClassWithInterfaceField() {
       this(null);
     }
 

gson/src/test/java/com/google/gson/functional/JsonTreeTest.java

@@ -75,6 +75,7 @@ public class JsonTreeTest extends TestCase {
   }
   
   private static class SubTypeOfBagOfPrimitives extends BagOfPrimitives {
+    @SuppressWarnings("unused")
     float f = 1.2F;
     public SubTypeOfBagOfPrimitives(long l, int i, boolean b, String string, float f) {
       super(l, i, b, string);

gson/src/test/java/com/google/gson/functional/MapTest.java

@@ -172,6 +172,7 @@ public class MapTest extends TestCase {
   private static class MyParameterizedMap<K, V> extends LinkedHashMap<K, V> {
     private static final long serialVersionUID = 1L;
 
+    @SuppressWarnings("unused")
     int foo = 10;
   }
   
@@ -248,6 +249,7 @@ public class MapTest extends TestCase {
   private static class MyMap extends LinkedHashMap<String, String> {
     private static final long serialVersionUID = 1L;
 
+    @SuppressWarnings("unused")
     int foo = 10;
   }
   

gson/src/test/java/com/google/gson/functional/NamingPolicyTest.java

@@ -82,6 +82,7 @@ public class NamingPolicyTest extends TestCase {
     assertEquals("{\"a\":3.0}", actual);
   }
 
+  @SuppressWarnings("unused")
   private static class ClassWithDuplicateFields {
     public Integer a;
     @SerializedName("a") public Double b;

gson/src/test/java/com/google/gson/functional/NullObjectAndFieldTest.java

@@ -151,6 +151,7 @@ public class NullObjectAndFieldTest extends TestCase {
     private Long value;
   }
 
+  @SuppressWarnings("unused")
   private static class ClassWithMembers {
     String str;
     int[] array;

gson/src/test/java/com/google/gson/functional/ObjectTest.java

@@ -366,6 +366,7 @@ public class ObjectTest extends TestCase {
   }
 
   private static class ClassWithObjectField {
+    @SuppressWarnings("unused")
     Object member;
   }
   
@@ -391,6 +392,7 @@ public class ObjectTest extends TestCase {
   }
    
   private static class Parent {
+    @SuppressWarnings("unused")
     int value1 = 1;
     private class Child {
       int value2 = 2;
@@ -404,7 +406,8 @@ public class ObjectTest extends TestCase {
     private SortedSet<Character> sortedSet;
 
     // For use by Gson
-    ClassWithSubInterfacesOfCollection() {
+    @SuppressWarnings("unused")
+    private ClassWithSubInterfacesOfCollection() {
     }
 
     public ClassWithSubInterfacesOfCollection(List<Integer> list, Queue<Long> queue, Set<Float> set,
@@ -496,7 +499,9 @@ public class ObjectTest extends TestCase {
   private static class SubTypeOfNested extends Nested {
     private final long value = 5;
 
-    public SubTypeOfNested() {
+    // Used by Gson
+    @SuppressWarnings("unused")
+    private SubTypeOfNested() {
       this(null, null);
     }
 

gson/src/test/java/com/google/gson/functional/ParameterizedTypesTest.java

@@ -271,7 +271,9 @@ public class ParameterizedTypesTest extends TestCase {
     private final List<? extends T> listOfWildcardTypeParameters;
     private final List<? extends T>[] arrayOfListOfWildcardTypeParameters;
 
-    public ObjectWithTypeVariables() {
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private ObjectWithTypeVariables() {
       this(null, null, null, null, null, null);
     }
 
@@ -386,7 +388,9 @@ public class ParameterizedTypesTest extends TestCase {
     C c;
     D d;
     E e;
-    MultiParameters() {
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private MultiParameters() {
     }
     MultiParameters(A a, B b, C c, D d, E e) {
       super();
@@ -461,9 +465,11 @@ public class ParameterizedTypesTest extends TestCase {
   
   // Begin: tests to reproduce issue 103
   private static class Quantity {
+    @SuppressWarnings("unused")
     int q = 10;
   }
   private static class MyQuantity extends Quantity {
+    @SuppressWarnings("unused")
     int q2 = 20;
   }
   private interface Measurable<T> {    

gson/src/test/java/com/google/gson/metrics/PerformanceTest.java

@@ -72,7 +72,10 @@ public class PerformanceTest extends TestCase {
   private static class ExceptionHolder {
     public final String message;
     public final String stackTrace;
-    public ExceptionHolder() {
+    
+    // For use by Gson
+    @SuppressWarnings("unused")
+    private ExceptionHolder() {
       this("", "");
     }
     public ExceptionHolder(String message, String stackTrace) {
@@ -81,11 +84,13 @@ public class PerformanceTest extends TestCase {
     }
   }
 
+  @SuppressWarnings("unused")
   private static class CollectionEntry {
     final String name;
     final String value;
 
-    CollectionEntry() {
+    // For use by Gson
+    private CollectionEntry() {
       this(null, null);
     }