Checking method template parameter type

Question

I have the following method:

<T> String getBeanStrategyName(Store baseStoreModel, T clazz) {
    if (clazz instanceof PointsStrategy) {
        return baseStoreModel.getPointsStrategy();
    } else if (clazz instanceof RedemptionStrategy) {
        return baseStoreModel.getRedemptionStrategy();
    } else {
        return baseStoreModel.getPointsStrategy();
    }
}

However when I call the method like this getBeanStrategyName(store,PointsStrategy.class), the check clazz instanceof PointsStrategy returns false. I need somehow to check the passsed type and based on it return particular strategy

Object of type `PointsStrategy` is not the same as `PointsStrategy.class`. — Alexander Ivanchenko, Aug 26 '22 at 07:57
Does this answer your question? [Java instanceof with class name](https://stackoverflow.com/questions/13873933/java-instanceof-with-class-name) — banan3'14, Aug 26 '22 at 08:13

banan3'14 · Answer 1 · 2022-08-26T08:06:42.883

1

PointsStrategy.class is of type java.lang.Class, not PointsStrategy so it rightfully returns false.

You can check it using

clazz.equals(PointsStrategy.class)

and btw it's better to declare the parameter as Class<?> to have a clearer contract,

String getBeanStrategyName(Store baseStoreModel, Class<?> clazz)

edited Aug 26 '22 at 08:06

answered Aug 26 '22 at 07:59

banan3'14

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Yes, or ` String getBeanStrategyName(Store baseStoreModel, Class clazz)` – Maurice Perry Aug 26 '22 at 08:18
or simpler `String getBeanStrategyName(Store baseStoreModel, Class extends Strategy> clazz)` – banan3'14 Aug 26 '22 at 19:34

Checking method template parameter type

1 Answers1