I have this declaration/initiation written for Java JDK 1.6
Map<String, <? extends List<?>>> groupThemTogether = new HashMap<String, ArrayList<String[]>>();
The error happens at the first comma. The error message is
Type mismatch: cannot convert from HashMap<String,ArrayList<String[]>> to Map<String,List>
Why doesn't this compile?
You've got too many angle brackets. Try this:
Map<String, ? extends List<?>> groupThemTogether = new HashMap<String, ArrayList<String[]>>();
This compiles for me.
Are you sure of this?
This, similar code, compiles OK for me:
Map<String, ? extends List<?>> groupThemTogether = new HashMap<String, ArrayList<String[]>>();
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.