Discussion
What will be the output of the program?
import java.util.*;
public class Snippet38
{
public static void main(String[] args)
{
List<String> l = Collections.emptyList();
System.out.print(l.size());
l.add("a");
}
}
Answer: B
emptyList returns an immutable shared instance, so the size prints as 0 and the add then throws UnsupportedOperationException. It exists to avoid allocating a new empty list, which is only safe because nothing can modify it.
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