I am trying to do
ArrayList<Integer> tempList = (ArrayList <Integer>) list.clone();
but I get the unchecked warning. list is defined as ArrayList<Integer> list
.
Basically, I am trying to cast the clone of list so that list remains unchanged by my method, so I am creating a templist using the clone. I am confused with respect to how to go about doing this cast using generics.
Thanks in advance.
My guess is that your code does not say what you think it says, considering the following does not trigger any warnings.
public class Test {
public static void main(String[] arguments) {
ArrayList<Integer> list = new ArrayList<Integer>();
ArrayList<Integer> clone = (ArrayList<Integer>)list;
}
}
I personally avoid clone() like the plague anyway. Why not do something like this?
ArrayList<Integer> clone = new ArrayList<Integer>();
clone.addAll(list);
Drake
This version gives the warning:
public class Test {
public static void main(String[] arguments) {
ArrayList<Integer> list = new ArrayList<Integer>();
ArrayList<Integer> clone = (ArrayList<Integer>)list.clone();
}
}
However, Drake_Dun is right, you probably want to copy the
list rather than cloning it. If you insist on using clone without a
warning, you loose the type information:
public class Test {
public static void main(String[] arguments) {
ArrayList<Integer> list = new ArrayList<Integer>();
ArrayList<?> clone = (ArrayList<?>)list.clone();
}
}