How to clone a container (e.g. ArrayList) * easy *? Is it wrong to use .clone ()?

Question

My possibly naive solution for cloning an ArrayList (vector replacement)

ArrayList<Double> alBis = (ArrayList<Double>) alOriginal.clone();

given that since the array contains immutable pairs, I don't need to clone them, but only a container.

Since clone () returns the object, I put a throw there, but then -Xlint complains that this is an uncontrolled selection.

So what now? Ignore it with supressWarnings? Create a new ArrayList and copy the original elements with a compact? Any library method similar to Arrays.copyOf ()?

I am reading an Immediate Warning Warning , but the accepted method is incredibly complicated.

Answer 1

clone() , . . !

. :

List<Double> original = // some list
List<Double> copy = new ArrayList<Double>(original);

:

• ArrayList<E>(Collection)

Answer 2

.clone()?

, . , API. , @Sean.

Answer 3

Google guava-libraries :

 ImmutableCollection<Double> copy = ImmutableList.copyOf(original);

JRE-, ( , , ).

:

• ImmutableList
• Java, 3, 10