Module com.google.gson
Package com.google.gson.reflect

Class TypeToken<T>

  • public class TypeToken<T>
extends Object
    Represents a generic type T. Java doesn't yet provide a way to represent generic types, so this class does. Forces clients to create a subclass of this class which enables retrieval the type information even at runtime.

    For example, to create a type literal for List<String>, you can create an empty anonymous inner class:

    TypeToken<List<String>> list = new TypeToken<List<String>>() {};

    This syntax cannot be used to create type literals that have wildcard parameters, such as Class<?> or List<? extends CharSequence>.

    Author:
    Bob Lee, Sven Mawson, Jesse Wilson

    • Constructor Detail

      • TypeToken

        protected TypeToken()
        Constructs a new type literal. Derives represented class from type parameter.

        Clients create an empty anonymous subclass. Doing so embeds the type parameter in the anonymous class's type hierarchy so we can reconstitute it at runtime despite erasure.

    • Method Detail

      • getRawType

        public final Class<? super T> getRawType()
        Returns the raw (non-generic) type for this type.

      • getType

        public final Type getType()
        Gets underlying Type instance.

      • isAssignableFrom

        @Deprecated
public boolean isAssignableFrom(Class<?> cls)
        Deprecated.
        this implementation may be inconsistent with javac for types with wildcards.
        Check if this type is assignable from the given class object.

      • isAssignableFrom

        @Deprecated
public boolean isAssignableFrom(Type from)
        Deprecated.
        this implementation may be inconsistent with javac for types with wildcards.
        Check if this type is assignable from the given Type.

      • isAssignableFrom

        @Deprecated
public boolean isAssignableFrom(TypeToken<?> token)
        Deprecated.
        this implementation may be inconsistent with javac for types with wildcards.
        Check if this type is assignable from the given type token.

      • hashCode

        public final int hashCode()
        Overrides:
        hashCode in class Object

      • get

        public static TypeToken<?> get(Type type)
        Gets type literal for the given Type instance.

      • get

        public static <T> TypeToken<T> get(Class<T> type)
        Gets type literal for the given Class instance.

      • getParameterized

        public static TypeToken<?> getParameterized(Type rawType,
                                            Type... typeArguments)
        Gets type literal for the parameterized type represented by applying typeArguments to rawType.

      • getArray

        public static TypeToken<?> getArray(Type componentType)
        Gets type literal for the array type whose elements are all instances of componentType.