Discussion
What will be the output of the program?
import java.util.*;
public class Program30
{
public static void main(String[] args)
{
List<String> l = Collections.nCopies(3, "a");
System.out.println(l + " " + l.size());
}
}
Answer: B
nCopies returns an immutable list containing the same reference the requested number of times, so it prints [a, a, a] with a size of 3. The list is a compact view rather than a real array of three slots, and attempting to modify it throws UnsupportedOperationException.
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