How to pass object of type Map as argument to function

Question

I have an abstract base class that has the following private variable

private Map<String, ?> options;

I want every other class that will extend my base class to implement the following method

protected abstract void initOptions(Map<String,?> options)

my problem is that I can't choose any other type than Map for the implementation

@Override
protected void initOptions(Map options) throws InternalLoginException {
    ...
}

What is the proper way to handle such a situation where I do not have control over the type of the options Map but I want to let the implementing class of the initOptions method know that the key in the Map is of type String and the value could be any Object.

I'm not sure what you're trying to do by creating a private variable in the abstract class and not using it anywhere in abstract class + not exposing it via public method + no way to set this parameter. I was able to achieve whatever you've written here in my local IntelliJ IDE. You must be doing something wrong when writing the code. What is the error you're getting ? — Aman, May 03 '22 at 14:42
For me, it is unclear what you mean by "*my problem is that I can't choose any other type than Map for the implementation*". We defined the abstract method to take a `Map<...>`, hence we must implement a method with that exact signature in all children. Please [edit] the post and clarify the question. --- Please read: [What is a raw type and why shouldn't we use it?](https://stackoverflow.com/questions/2770321/what-is-a-raw-type-and-why-shouldnt-we-use-it) — Turing85, May 03 '22 at 14:42

score 2 · Accepted Answer · answered May 03 '22 at 14:46

2

public abstract class BaseClass {

    abstract void methodToOverRide(Map<String, ?> parameter);


    static class SubClass extends BaseClass{

        @Override void methodToOverRide(Map<String, ?> parameter) {

            //do something?
        }
    }
}

What you have should work as shown above.

answered May 03 '22 at 14:46

JCompetence

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thank you. I just found out that the problem was something else. BaseClass had a generic parameter T. That parameter is not used in the map, yet it gave me this error message: "'methodToOverRide(Map)' in 'BaseClass.SubClass' clashes with 'methodToOverRide(Map)' in 'BaseClass'; both methods have same erasure, yet neither overrides the other" defining Subclasses type solved the issue. – dasd-431 May 03 '22 at 15:33

How to pass object of type Map as argument to function

1 Answers1