class ObjectReaderImplOptionalDouble
        extends ObjectReaderPrimitive {
    static final ObjectReaderImplOptionalDouble INSTANCE = new ObjectReaderImplOptionalDouble();

    public ObjectReaderImplOptionalDouble() {
        super(OptionalDouble.class);
    }

    @Override
    public Object readJSONBObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {
        Double value = jsonReader.readDouble();
        if (value == null) {
            return OptionalDouble.empty();
        }
        return OptionalDouble.of(value);
    }

    @Override
    public Object readObject(JSONReader jsonReader, Type fieldType, Object fieldName, long features) {<FILL_FUNCTION_BODY>}
}

        Double value = jsonReader.readDouble();
        if (value == null) {
            return OptionalDouble.empty();
        }
        return OptionalDouble.of(value);
    
<methods>public void <init>(Class#RAW) ,public java.lang.Object createInstance(long) ,public Class#RAW getObjectClass() ,public abstract java.lang.Object readJSONBObject(com.alibaba.fastjson2.JSONReader, java.lang.reflect.Type, java.lang.Object, long) <variables>protected final non-sealed Class#RAW objectClass