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 */
}
Which code fragment, when inserted at line n1, enables the Birdie class to compile?
The correct answer involves defining the fly method to accept a Supplier of Bird objects. A Supplier is a functional interface that supplies objects of a given type. In this case, it seamlessly handles both Bird and Penguin instances. The correct fly method syntax is static void fly(Supplier<Bird> bird) { bird.get().fly(); }, ensuring that the get method retrieves a Bird object, on which the fly method can then be invoked.
The answer is C but it must have a period(.) after bird.get(). Eventually bird.get().fly()
package birdie; import java.util.function.Supplier; class Bird { public void fly() { System.out.print("Can fly"); } } class Penguin extends Bird { public void fly() { System.out.print("Cannot fly"); } } public class Birdie { public static void main(String[] args) { fly(() -> new Bird()); fly(Penguin::new); } static void fly(Supplier<Bird> bird) { bird.get().fly(); } }
Compiling the code with answer C (it is the right answer) results in following output: Can flyCannot fly
C is the answer
Answer is C
Answer is C.
lack a dot, shoule be compile error
public class ch7 { public static void main(String[] args) { fly(() -> new Bird()); fly(Penguin::new); } static void fly(Supplier<Bird> bird) { bird.get().fly(); } } class Bird { public void fly() { System.out.println("Can fly"); } } class Penguin extends Bird { public void fly() { System.out.println("Cannot fly"); } }
C, tested