Java collections — polymorphic access to elements

Question

I have a LinkedHashSet of values of ThisType. ThisType is implementing the interface ThatType.

I ne

Answer 1

You need the wildcard of Set. Look at following example

public static void main(String[] args) {
    Set set=new LinkedHashSet<>();
    Set set2=new LinkedHashSet<>();

    someFunction(set);
    someFunction(set2);
}

static void someFunction(Set set) {

}

class ThisType implements ThatType{

}
interface ThatType{

}