Which statements are true about the following code? (Choose all that apply) 1: interface HasVocalCords { 2: public abstract void makeSound(); 3: } 4: public interface CanBark extends HasVocalCords { 5: public void bark(); 6: } *1 pointA. The CanBark interface doesn’t compile.B. A class that implements HasVocalCords must override the makeSound() method.C. A class that implements CanBark inherits both the makeSound() and bark() methods.D. A class that implements CanBark only inherits the bark() method.E. An interface cannot extend another interface.
Question
Which statements are true about the following code? (Choose all that apply) 1: interface HasVocalCords { 2: public abstract void makeSound(); 3: } 4: public interface CanBark extends HasVocalCords { 5: public void bark(); 6: } *1 pointA. The CanBark interface doesn’t compile.B. A class that implements HasVocalCords must override the makeSound() method.C. A class that implements CanBark inherits both the makeSound() and bark() methods.D. A class that implements CanBark only inherits the bark() method.E. An interface cannot extend another interface.
Solution 1
The correct statements are:
B. A class that implements HasVocalCords must override the makeSound() method. C. A class that implements CanBark inherits both the makeSound() and bark() methods.
Explanation:
A. The CanBark interface compiles without any issues. It is perfectly valid for one interface to extend another in Java.
B. Any class that implements the HasVocalCords interface must provide an implementation for the makeSound() method, as it is an abstract method.
C. A class that implements the CanBark interface must provide implementations for both the makeSound() and bark() methods. This is because CanBark extends HasVocalCords, so it inherits the abstract methods of the parent interface.
D. This statement is incorrect. As explained above, a class that implements CanBark inherits both the makeSound() and bark() methods.
E. This statement is incorrect. In Java, an interface can indeed extend another interface.
Solution 2
The transfer of information and understanding from one person to another is known as communication.
Similar Questions
Which statements are true for both abstract classes and interfaces? (Choose all that apply *4 pointsA. All methods within them are assumed to be abstract.B. Both can contain public static final variables.C. Both can be extended using the extend keyword.D. Both can contain default methods.E. Both can contain static methods.F. Neither can be instantiated directly.G. Both inherit java.lang.Object.
2.Chương trình đúng hay sai ?interface A {public void aMethod();}interface B {public void bMethod();}interface C extends A,B {public void cMethod();}class D implements B {@Overridepublic void bMethod() {}}class E extends D implements C {@Overridepublic void aMethod() {}@Overridepublic void cMethod() {}}doneTrueFalse
Choose the correct statement about the following code: 1: interface HasExoskeleton { 2: abstract int getNumberOfSections(); 3: } 4: abstract class Insect implements HasExoskeleton { 5: abstract int getNumberOfLegs(); 6: } 7: public class Beetle extends Insect { 8: int getNumberOfLegs() { return 6; } 9: } *1 pointA. It compiles and runs without issue.B. The code will not compile because of line 2.C. The code will not compile because of line 4.D. The code will not compile because of line 7.E. It compiles but throws an exception at runtime.
Each of these classes can provide its own implementation of the interface.
Which of the following statements about interfaces in Java is correct? Select one: Interfaces cannot inherit from another interface. Using the keyword "extends," inheritance relationships can be defined both between classes and between interfaces. Using the keyword "implements," inheritance relationships can be defined both between classes and between interfaces. Interfaces can inherit only from one other interface.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.