Which of the following is the correct way to define an interface?
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- Say we have a collection of animal classes, with each class represents a kind of animal. They all share a common ability of “speak”. Dog speak in the way of “Woof! Woof!”, cats speak in the way of “Meow! Meow!”, etc. In order to capture this common characteristic, we need an interface named Speakable: public interface Speakable { // put the method header here } Think about what method is needed for the Speakable interface? (what method can describe the speakable feature? ) We simply need one method speak() to print out the way that the animal “speaks”. Put the method header in the interface body. This method does not take any parameter and does not return any value. Be reminded that you only need to put the method header with a semicolon (abstract method) into the interface. BE NOTED: Adding an interface is different from adding a class. You need to click File tab -> New -> Interface, to add an interface file to the project. Now download Dog.java. Have them implement the…Write a program in java language Create an interface EnhancedShape that extends Shape (From question 3) and also requires a method public double perimeter( ) to be implemented by any class that uses the interface. Question 3 Define an interface named Shape with a single method named area thatcalculates the area of the geometric shape: public double area(); Next,define a class named Circle that implements Shape . The Circle class shouldhave an instance variable for the radius, a constructor that sets the radius,accessor/ mutator methods for the radius, and an implementation of thearea method. Also define a class named Rectangle that implements Shape .The Rectangle class should have instance variables for the height andwidth, a constructor that sets the height and width, accessor and mutatormethods for the height and width, and an implementation of the areamethod.14. 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: } A. 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. Can you explain this code as well as the methods such as interface abstract etc. used in it.
- 14. 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: } A. 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. Please explain this code abstract, extent and interface methods too in detail.Write a Program in Java Create an interface EnhancedShape that extends Shape and also requires a method public double perimeter( ) to be implemented by any class that uses the interface. (Note: Interfaces can inherit other interface just like a class by using extends keyword. Create a class file, an interface ehancedshape extends shape, and an interface shape file).Suppose that MyInterface is a Java interface you have written. Which of the following is true about MyInterface and the Comparable interface?? a) If I want to use the methods in MyInterface in a class called MyClass, I must code "implements MyInterface " on the signature line of MyClass b) In the code for MyClass, I must implement (provide code for) all of the methods of MyInterface c) The Comparable interface has only one method - the compareTo method. d) The above statement are all true.
- Which of the following cases is most like the adapter pattern? A. If you have an interface called Duck, and have many ducks that implement the duck interface. All of these ducks must have the behaviour “quack” but for some ducks, like a Mallard, this must result in a quack, where for a rubber duck it must result in a squeak. We decide to delegate the quack method to another interface, which can be implemented either in a concrete class that returns a quack or a concrete class that returns a squeak. B. None of these are like the adapter pattern. C. We have a large collection of Ducks. We want to look at them one by one and hear them quack. We write a piece of code that iterates through them all, and as we encounter each one, we have it invoke the quack method. D. If we have an interface called Duck. We need to give an object to a user that can quack like a duck. All we have is Turkeys. We create a special class that implements the duck interface, and to implement the quack…Which of the following is an example of polymorphism in Java? A subclass inheriting from a superclass A class encapsulating data and methods A method accepting an object of a superclass as an argument A class implementing multiple interfaces. What can go wrong if you refactor an interface? 1. If an interface becomes a published interface, the interface is being used by code that you cannot find and change. 2. Nothing! 3. In Java, interfaces cannot be refactored 4. The program performance decreases Which of the following classes suffers from the Middle Man bad smell? 1. A class that contains more methods than it should 2. A class that delegates many of its requests to another class 3. A class that only contains data A class that contains less method than it should
- In this task, you will create your own interface, which is not provided in the Java library. Let’s start with a simple example. Say we have a collection of animal classes, with each class represents a kind of animal. They all share a common ability of “speak”. Dog speak in the way of “Woof! Woof!”, cats speak in the way of “Meow! Meow!”, etc. In order to capture this common characteristic, we need an interface named Speakable: public interface Speakable { // put the method header here } Think about what method is needed for the Speakable interface? (what method can describe the speakable feature? ) We simply need one method speak() to print out the way that the animal “speaks”. Put the method header in the interface body. This method does not take any parameter and does not return any value. Be reminded that you only need to put the method header with a semicolon (abstract method) into the interface. BE NOTED: Adding an interface is different from adding a class. You need to click File…The primary focus of this assignment is the use of interfaces. In programming, an interface is a public avenue by which data can be accessed and/or manipulated. five Java classes called Point, Circle, Square, Rectangle, and TestAll, as well as a Java interface called FigureGeometry. The TestAll class should implement the main method which tests all of the other files Point.java Description: Instance Variables: private int width;//stores the width of a Point object private private int height;//stores the height of a Point object Constructor: Point() Parameters: int theWidth, int theHeight Purpose: initializes the width and height of a Point object in the following manner: width = theWidth; height = theHeight; Methods: public int getWidth(){//returns the width of a Point object in the following manner return width;} public int getHeight(){//returns the height of a Point object in the following manner: return height;} public void setWidth(int theWidth){//assigns the width of a Point…Create a Java Project called “InterfaceDemo” and do the following:• Lecture slides show an example of Edible Interface. Create the same interface inside your Java Project. • Additionally create a default method of your choice to the “Edible” interface.• Create a Java class called “Vegetable” and two child classes for this class– “Broccoli” and “Potato” inside this class.• Implement the “Edible” interface for the parent class “Vegetable” and then implement the interface methods accordingly.• Create an object for each of the classes and call the interface method using the objects respectivel