Unchecked assignment for 'java.util.ArrayList'

问题

I get the warning:

Unchecked assignment for 'java.util.ArrayList' to 'java.util.ArrayList < com.test.mytest >'

for:

private ArrayList<LocoList> myLocations = new ArrayList();

How to fix it?

回答1:

You want new ArrayList<>(); so that you use the right generic type. At the moment you're using the raw type on the right hand side of =. So you want:

private ArrayList<LocoList> myLocations = new ArrayList<>();

Or just be explicit:

private ArrayList<LocoList> myLocations = new ArrayList<LocoList>();

(You might also consider making the type of the variable List<LocoList> instead of ArrayList<LocoList>, unless you're using ArrayList-specific members. I'd also ditch the "my" prefix, personally.)

来源：https://stackoverflow.com/questions/44078128/unchecked-assignment-for-java-util-arraylist