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import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Main { public static void main(String[] args) { ArrayList<String> cars = new ArrayList<String>(); cars.add("Volvo"); List<String> readOnly = Collections.unmodifiableList(cars); try { readOnly.add("BMW"); } catch (UnsupportedOperationException e) { System.out.println("Error: the list cannot be changed."); } } }
Error: the list cannot be changed.
