I am creating a list from a array using the Arrays.asList method.
Now I want to remove the first element, but Java accuses:
Exception in thread "main" java.lang.UnsupportedOperationException
List<Integer> lista = Arrays.asList(new Integer[] { 1, 2, 3 } );
lista.remove(0);
The method Arrays.asList returns a fixed-length list . View Documentation .
That is, you can not add elements to it, you can not remove elements from it, and you can not tweak the structure of it.
You can simply create a ArrayList from this list returned by the Arrays.asList method.
List<Integer> lista = new ArrayList<>(Arrays.asList(new Integer[] { 1, 2, 3 } ));
lista.remove(0);