Java: Safely typecast a Clone of an ArrayList?

Question

I would like to make a clone of my arraylist by this code:

ArrayList<String> _names;

ArrayList<String> names = (ArrayList<String>) _names.clone();

As far as I know, nothing special. My compiler however, gives the following warning:

Type safety: Unchecked cast from Object to ArrayList<String>

Does anybody know a cleaner solution that does not give me a warning?

Casting to ArrayList<?> will not give this warning. Do you need it to be an ArrayList<String>? Can you call toString on the resulting elements instead? — finnw
– finnw, Commented Feb 3, 2011 at 15:00
@ finnw: I need it for other types than just strings as well @ bestsss: i like the solution of cadrian better :) — Len
– Len, Commented Feb 3, 2011 at 20:46

cadrian · Accepted Answer · 2011-02-03 12:29:04Z

34

names = new ArrayList<String>(_names);

Or use @SuppressWarnings("unchecked")

answered Feb 3, 2011 at 12:29

cadrian

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