Given:
class Bird {
public void fly () { System.out.print("Can fly"); }
}
class Penguin extends Bird {
public void fly () { System.out.print("Cannot fly"); }
}
and the code fragment:
class Birdie {
public static void main (String [ ] args) {
fly( ( ) -> new Bird ( ));
fly (Penguin : : new);
}
/* line n1 */
}
line n1, enables the Birdie class to compile?
Which code fragment, when inserted at
The method 'fly' should take a functional interface that returns a Bird object, and a Supplier<Bird> fits this requirement because it supplies (or returns) a Bird when invoked via its get() method. The syntax 'bird.get().fly();' accesses the fly method of the Bird object produced by the Supplier. This way, when Supplier<Bird> bird = () -> new Bird() is passed, bird.get() produces a Bird instance which can then call the fly method. Similarly, passing Penguin::new as an argument would produce a Penguin instance, which also has a fly method. Option C is correct as it correctly incorporates a Supplier<Bird> and uses the correct method call to enable the Birdie class to compile and run, following the expected behavior of method references and lambda expressions in this context.
Correct.Answer is C.
C and D are correct
I confirm, it compiles with both c and d but we cannot see the body of d
C and D both compile.