Could not downcast using List class in Java
collections, downcast, generics, java
Solution
You cant do this, because Java does not allows this. Read this. You should do the trick:
List<Job> jobs = (List<Job>) ((List<?>)jobMapper.fetchAll());
Problem
I've been searching for an answer for this but to no avail. My question is why is it not possible to downcast with generics. I have a class called Job and extends a class called Model ``` Job extends Model ``` Now I get a collection of Jobs from a reusable code that generates a list of Models ``` // error: Cannot cast from List<Model> to List<Job> List<Job> jobs = (List<Job>) jobMapper.fetchAll(); ``` where jobMapper.fetchAll() returns a List where each model inside it is a Job object. I assumed this would work because I can do: ``` EditText mUsername = (EditText) findViewById(R.id.editUserName); ``` which is a simple downcasting.