How do I pass in generic parameters to a method in java? [duplicate]

Question

I wish to let the withParameters(String token, RiskRating details) method take in an object of type that's either a RiskRating object or is a subclass of it

Something like withParameters(String token, T extends RiskRating details)

public Response withParameters(String token, RiskRating details)  {
        return SerenityRest.given()
                .header("Accept", "application/json")
                .header("Content-Type", "application/json")
                .header("Authorization", "Token " + token)
                .body(details)
                .post(WebServiceEndPoints.RISKRATING.getUrl());

    }

How do I achieve this?

T extends RiskRating is already correct, you just need to place it correctly. See the given link how to do so for methods. — Tom
– Tom, Commented Dec 21, 2020 at 9:28
public <T extends RiskRating> Response withParameters(String token, T details) {} — Hadi
– Hadi, Commented Dec 21, 2020 at 9:30
Your method does already “take in an object of type that's either a RiskRating object or is a subclass of it”. — Holger
– Holger, Commented Dec 21, 2020 at 11:25

tgdavies · Accepted Answer · 2020-12-21 09:59:42Z

1

There is no need for generics here.

Passing an instance of a subclass to a method which takes a parent class is fine.

A subclass IS-A superclass.

public class Animal {}
class SubAnimal extends Animal {}

class Example {
    static void takesAnimal(Animal a) {}
    static void passesSubAnimal() {
        takesAnimal(new SubAnimal());
    }
}

answered Dec 21, 2020 at 9:59

tgdavies

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