Java method: Finding object in array list given a known attribute value

Question

I have a couple of questions actually.

I have a class Dog with the following instance fields:

private int id;
private int id_mother;         


        

Answer 1

I solved this using java 8 lambdas

int dogId = 2;

return dogList.stream().filter(dog-> dogId == dog.getId()).collect(Collectors.toList()).get(0);