Discussion
What will be the output of the program?
import java.util.*;
public class Listing97
{
public static void main(String[] args)
{
List<String> queue = new ArrayList<String>(
Arrays.asList("a", "b", "c"));
List<String> done = new ArrayList<String>(queue);
queue.removeAll(done);
System.out.println(
queue.isEmpty() + " " + done.size() + " " + queue.size());
}
}
Answer: A
removeAll deletes every element that also appears in the argument, and the argument is a copy of the whole list, so everything goes and the queue is empty. It modifies only the receiver, so the copy still holds its 3 elements. An emptied list is still a perfectly good object.
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