Discussion
What will be the output of the program?
import java.util.*;
public class Program42
{
static class Person
{
String name;
Person(String name) { this.name = name; }
}
public static void main(String[] args)
{
List<Person> people = new ArrayList<Person>(
Arrays.asList(new Person("zoe"), new Person("amy")));
Collections.sort(people);
System.out.println(people.size());
}
}
Answer: B
Collections.sort requires its element type to extend Comparable, and the compiler enforces that through the method's generic signature, so this is rejected before it can run. The raw-typed equivalent from before generics would instead have compiled and thrown ClassCastException at runtime.
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