6- Which of the following is a correct interface? I. interface A { void methodX () { } } II. abstract interface A methodX(); III. abstract interface A { abstract void methodX () { } IV. interface A { void methodX (); } a) O I b) O IV c) O III d) O |I

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A: NOTE Below is the answer for the given question.  Hope you understand it well. If you have any…

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A: the answer is an   an interface can cantain publics static final data field  a class can implement…

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A: Actually, java is a object oriented programming language.

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A: Answer: 4

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A: Declare an interface named A with a generic type

Q: 1(c). what is the problem with the code below? Write two different ways to fix the problem.…

A: To Do: To tell the ways to fix the given codes.

Q: 5). What will be the output of the following code? interface Test { int x = 10; } public class…

A: Answer:-(C) compilation error

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Q: State true or false to implement an interface, a concrete class must implement at least one method…

A: An interface is a mechanism or a tool that allows two unconnected things to communicate with one…

Q: State true or false to implement an interface, a concrete class must implement at least one method…

A: To be determined: State whether the statement is true or not - to implement an interface , a…

Q: State true or false to implement an interface, a concrete class must implement at least one method…

A: check further steps for the answers :

Q: Question 4: You have an interface ICar, with a method drive(); a. You have classes BMW, and Mercedes…

A: I give the code in java as per your requirement along with code screenshot and output screenshot

Q: Question 4: You have an interface ICar, with a method drive(); a. You have classes BMW, and Mercedes…

A: An interface in the Java programming language is an abstract type that is used to specify a behavior…

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A: Given:

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A: Java program to create Employee and Manager class and build the given functionality.

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A: Here is the solution with an output:-

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A: Below is the complete java program:

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A:

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Q: Which of the following is true of abstract classes? a.An abstract class cannot have child classes…

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Q: True or False An interface can contain only abstract methods and constants.

A: solution:True

Q: Write a program using the concept of interface to do the following. a) Create an interface Student…

A: import java.util.Scanner;interface Student{                              //Interface named Student…

Q: Which keyword is used to inherit a superclass into subclass? O a. extends O b. void O c. abstract O…

A: Actually, java is a object oriented programming language. It is a platform independent.

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Q: Overriding is useful when a method has the same signature and type as a method in the parent class.…

A: Given: To choose the correct option and fill in the blanks.