Java Lambda on an Object Collection

Question

I am playing around with the new Lambdas in Java 8 in Android Studio and attempting to utilize the below line:

public Contact findContactByCode(String ContactCode) {
    return this.list.stream().filter(o -> o.getType().getCode() == ContactCode).collect(Collectors.toList());
}

The list object is a generic ArrayList, for which the generic type has been assigned to the Contact Model. Everything is good until I get to the collection function and that is where I am getting the below error:

"no instance of variable T exists so that List< T > conforms to Contact, inference variable R has incompatible bounds: Equality constraints: List< T >, Upper bounds: Object, Contact"

Everything that I am seeing looks correct, but I am not quite sure what is going wrong.

Please post few more lines of your code including instantiation of the array list. — Indra Basak
– Indra Basak, Commented Sep 29, 2017 at 17:35
Indra Basak, I have include the entire function. Which is not much. — Bob J
– Bob J, Commented Sep 30, 2017 at 13:46
Contact is not a List. Change the method to return List<Contact> — Chetan Kinger
– Chetan Kinger, Commented Sep 30, 2017 at 13:50

Victor Grazi · Accepted Answer · 2019-01-13 03:14:42Z

1

You are attempting to return a List, but the method declaration calls for returning a Contact. Change one of those and you should be fine

answered Jan 13, 2019 at 3:14

Victor Grazi

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