Exam 1z0-809 topic 1 question 7 discussion

The correct answer is A. static void fly (Consumer<Bird> bird) { bird :: fly (); }. Here's a breakdown of why: Method Signature: The Birdie class needs a static method fly that takes a functional interface as a parameter. Functional Interface: The Consumer interface is suitable because it accepts a single parameter (a Bird in this case) and doesn't return a value. Method Body: The method body should call the fly method of the Bird object passed as a parameter. The :: operator is used to reference the fly method as a method reference.

C is the answer

Answer is C

Answer is C.

lack a dot, shoule be compile error

The answer is C but it must have a period(.) after bird.get(). Eventually bird.get().fly()

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"); } }

Compiling the code with answer C (it is the right answer) results in following output: Can flyCannot fly

C, tested

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(); } }