Discussion
What will be the output of the program?
import java.util.*;
public class Snippet62
{
public static void main(String[] args)
{
List<String> l = new ArrayList<String>(
Arrays.asList("a", "b", "c"));
l.clear();
System.out.println(l.isEmpty() + " " + l.size() + " " + (l == null));
}
}
Answer: B
clear empties the list but does not discard it, so isEmpty is true, the size is 0 and the reference is still a perfectly good object rather than null. An emptied collection and a null reference behave very differently at the next method call.
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