Given the following code:
public class Test{
static class Bird{}
static class Sparrow extends Bird{}
public static void main(String args[]){
List<? extends Bird> list = new ArrayList<Bird>();
list.add(new Bird()); //Does not compile ...line 1
list.add(new Sparrow());//Does not compile ...line 2
}
}
Can someone explain why I cannot add the object of new Bird() and the object of new Sparrow() into the list? I was expecting line 1 and line 2 to compile since the class Sparrow is a subclass of Bird, and Bird is itself.
