B. class manager implements salary {}

Just use Interface name and DOT (.) C. final A) TRUE Attend job interviews easily with these Multiple Choice Questions. An interface in Java is like a 100% ____. This GATE exam includes questions from previous year GATE papers. D. All variables are static and methods are public if interface is defined pubic. { } An interface can extends another interface or multiple interfaces. Attempt a small test to analyze your preparation level. { FALSE Explanation: All methods and variables are implicitly public if interface is declared public. Answer[=] { TRUE Please disable your Ad-Blocker so we can earn from ads and keep this project alive. 6. What happens when we access the same variable defined in two interfaces implemented by the same class? AllIndiaExams provides you lots Interfaces Questions and Answers with proper explanation. B { 25) Which is the missing code to successfully compile the below Java program with abstract classes and Interfaces? }, What is the output of the below Java program with an abstract class? You can download these MCQs in PDF format by Choosing Print Option first and Save as PDF option next using any Web Browser. //abstract methods } All Interface methods in Java are ____ by default. Can "abstract" keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block. Here you can access and discuss Multiple choice questions and answers for various competitive exams and interviews. 11. 7) What is the output of the below Java program with an Interface? D. The implementing class will throw exception. { A An interface can only contain abstract methods. 14) A Java Interface can not declare constructors. Your email address will not be published.

Certifications Boost Confidence. { Comment * document.getElementById("comment").setAttribute( "id", "ad5282e17b3d20d85e5bdadfd4025b87" );document.getElementById("b4ee39581b").setAttribute( "id", "comment" ); In this tutorial, we are going to see What is a Web Worker in JavaScript? You can submit your quiz responses at any time. //abstract methods 10. You can print these Questions in default mode to conduct exams directly. C. The interface compiles successfully 4) Choose a correct statement about Java Interfaces? Find the given file. Which of these keywords is used by a class to use an interface defined previously? Choose a correct implementation of an Abstract class in the below Java code? 9) All Interface variables are ___ by default in Java. System.out.println("Inside Constructor of Coffee.."); You no need to worry, we have given lots of Interfaces Questions and Answers and also we have provided lots of FAQ's to quickly answer the questions in the Competitive Exams interview. 17.

{ 1) An interface in Java is like a 100% ____. System.out.println("Inside Main() method.."); { { What happens when a constructor is defined for an interface? You can define a variable with the same name in the implementing class. 19.

operator directly. 24) Which is the missing java code in the class implementing an Interface below?

{ } } 13) What is the output of the below Java program with an Interface? A. class Cat implements IAnimal{} B) A Java class can implement multiple interfaces. abstract interface NAME 15. { Yes. What will happen if we provide concrete implementation of method in interface? D) All the above C. implements 6) What is the output of the below Java program with an Interface? A Java Interface is not considered a class. { new InterfaceTest2().changePrice(); void print() Which of the following is correct way of implementing an interface salary by class manager? C) An Interface can extend or inherit another Interface. Instructions: State TRUE or FALSE. D. none of the mentioned. D It is optional. public class Test { public static void main(String[] args){ String value = abc; changeValue(value); System.out.println(value); } public static void changeValue(String a){ a = xyz; } }. public class AbstractClassTesting3 This collection of Java Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on Java Interfaces. You should not use object references to access the static method of an Interface. { For each question, C. Private and protected access modifiers can also be used to declare methods in interface An Interface can extend or inherit another Interface. { B. class Cat import IAnimal{} Which of these keywords is used by a class to use an interface defined previously? abstract class MathLibrary We may get some affiliate commission for the above purchases. You can define a constructor inside an Interface. 4) Choose a correct statement about Java Interfaces? B. } ou have two class files name Test.class and Test1.class inside javaproject directory. A. Compilation failure C) - Percent Correct: Coffee() //abstract methods System.out.println("Editor method"); D. Method not found exception is thrown, Explanation: The methods of interfaces are always abstract. public static void main(String[] args)

True. Evaluate your skill level in just 10 minutes with QUIZACK smart test system. Which of these access specifiers can be used for an interface? Closed source projects can still introduce new features using the same keyword DEFAULT. B. The existing classes still do not utilize these new static methods of the interface. 14. }, All Interface variables are ___ by default in Java, An abstract class can define ____ inside of it, An abstract class in Java can be created using the keyword ____, Choose a correct statement about Java Interfaces. { Forward compatibility means, the implementing classes may be modified to access these static methods. Login To Like, Dislike, Follow Us or To Access Channel. 5) A Java Class inherits Constants and Methods of an Interface using ____ keyword. Interface automatically marks all its methods as public and abstract. D) anonymous class A. { abstract class Author extends Editor This is a practice quiz. public static void main(String[] args) 7. Before you submit the quiz, you will have the opportunity to return to int basePrice=1000; System.out.println(MathLibrary.PI); Answer[=] What type of methods an interface contain by default? To avoid confusion to the JVM interfaceName.variableName is mandatory. in any quiz or test that does count toward your grade. Remember that "default" is a keyword. Which of these keywords is used to define interfaces in Java? Explanation: By default, interface contains abstract methods. interface NAME System.out.println("DoorBell ringing.."); As the Speaker class is implementing two interfaces Linein and Lineout, the abstract methods of all the interfaces have to be implemented by the first concrete class. } Once they complete the implementation of all the DEFAULT methods in the implementing classes, they can completely remove default methods and provide only abstract methods. interface Car A. Interfaces are specified public if they are to be accessed by any code in the program 3. abstract void print(); IMPLEMENTS keyword 16) Java 8 (Java 1.8) introduced the ___ feature. You can not use the keywords, private, protected, final and abstract, before a static method of an Interface.

When no access specifier is used then default access specifier is used due to which interface is available only to other members of the package in which it is declared, when declared public it can be used by any code. public class AbstractClassTesting Which of the following is an incorrect statement about packages? Not possible to override the static method. 2) A Java Interface is not considered a class. DoorBell() C) Compiler error as teeth is a constant in Worm interface. 22) It is ___ to override the static method of an Interface in Java. { D) All the above Copyright 2021 Quizack . Author au = new Office(); All students, freshers can download Interfaces Questions Attend job interviews easily with these Multiple Choice Questions. Bell bell = new DoorBell(); Make your choice by clicking on its button. { You can not instantiate an Interface in Java. Web Worker allows us to. questions that you may have missed or have not yet answered. C. class manager extends salary {} } They provide only method definition. Go through, Java Interface Interview MCQ Questions and Answers, Java 8 Default and Static Methods in Interfaces, 2. void show() 12. B. static 5. A C. Compilation failure Hence, answer would be A. Explanation: The JVM needs to distinctly know which value of variable it needs to use. An abstract class with 100% abstract methods is equivalent to ______. cd javaproject java Test Test1 What is the output? D. Implements. In other words, these are constants. When the quiz is graded, the correct answers will appear in the box after each question. Certifications Boost Confidence. { Without the keyword DEFAULT, the project build fails. By { B. Runtime Exception A) Interface contains only abstract methods by default. What is the output of the below Java program with an abstract class? B. Interfaces specifies what class must do but not how it does A a1 = new A() { 4. public void printValue(){ 5. interface is inherited by a class using implements. 8) What is the output of the below Java program with an Interface? A class and an Interface have different inheritance rules. package com.concretepage; class Road { public static void main(String[] args) { for(int __x = 0; __x < 3; __x++) ; int #lb = 7; long [] x [5]; Boolean []ba[]; } enum Traffic { RED, YELLOW, GREEN }; } What is the result? 16. A. Compilation failure Backward and Forward Compatibility. Letter Grade. 11) A Class implementing an Interface can use ____access modifier before the implemented methods. "); Quizack provides Online Quiz and Practice MCQs for Free. 4. } C. class Cat extends IAnimal{} public static void main(String[] args) There is no need to explicitly mention ABSTRACT keyword to define an interface. public static void main(String[] args)

{ Explanation: In java, an interface contains only abstract method that can be public and it does not have any method implementation. D. The interfaceName.variableName needs to be defined. You can print these Questions in default mode to conduct exams directly. int a=5; C) EXTENDS public class InterfaceTest1 Core Java: An Integrated Approach, Black Book. A) INTERFACE }; 8. a1.printValue(); 9. } Open Source projects do not know how many organizations or users have been dependent on the project. C. The JVM is not able to identify the correct variable Solved examples with detailed answer description, explanation are given and it would be easy to understand. basePrice = 2000; Questions from Previous year GATE question papers, UGC NET Previous year questions and practice sets. 12) A Java Class implementing an Interface can define a variable with the same name as that of the Interface constant. class DoorBell extends Bell So, you need not add these keywords again while writing the program. The questions asked in this NET practice paper are from various previous year papers. void changePrice() class Anonymous A. A Java Class inheritsConstants and Methods of an Interface using ____ keyword. A) Output:

B. Runtime Exception 10) All Interface methods in Java are ____ by default. There is no need to explicitly mention ABSTRACT keyword to define an interface. Go through Java Theory Notes on Interface and Java 8 Default and Static Methods in Interfacesbefore reading these objective questions. Practice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews. Explanation: Answer[=] } B. import System.out.println("Inside Constructor of ColdCoffee.."); https://quizack.com/java/sun-certified-java-programmer-scjp/mcq/choose-the-correct-statement, "A extends B" is correct if and only if A is a class and B is an interface, "A extends B" is correct if and only if A is an interface and B is a class, "A extends B" is correct if A and B are either both classes or both interfaces, "A extends B" is correct for all combinations of A and B being classes or interfaces, Note: This Question is unanswered, help us to find answer for this one, What is the output for the below code? A Class implementing an Interface can use ____ access modifier before the implemented methods. void move(); 19) The DEFAULT methods of an Interface are suitable mostly for ___ type of projects. C. All variables in interface are implicitly final and static }, What is the output for the below code? public class A { static{System.out.println(static);} { System.out.println(block);} public A(){ System.out.println(A); } public static void main(String[] args){ A a = new A(); } }. 15) What is the output of the below Java program with an Interface? System.out.println("Implemented move() method. A. Explanation: True. 3) Choose the correct syntax below for defining an Interface in Java. 20. Explanation: Constructor is not provided by interface as objects cannot be instantiated. } System.out.print(basePrice); C. Can be true or false interface Bus } The questions on this quiz might not appear So, it is advised to take advantage of the DEFAULT methods of an Interface to introduce new features. 4. Which of the following is the correct way of implementing an interface salary by class manager? Only a "public" access modifier is allowed. { }, All Interface methods in Java are ____ by default, An abstract class in Java usually contains one or more abstract ____, What is the output of the below Java program with an abstract class? }. B) } { ed.show(); { The number you got right: The end-user of a Closed-Source project is the company itself that developed it. State TRUE or FALSE. In this Interfaces Questions and Answers section you can learn and practice Interfaces Questions and Answers to improve your skills in order to face technical inerview conducted by organisations. Yes. Yes, public and final. class ColdCoffee extends Coffee

What is the output of the below Java code with an abstract class and inner class? 7. The abstract methods need to be implemented by concrete classes. Import public class InterfaceTest2 implements Car } B) public class State TRUE or FALSE. You can reassign an interface's constant. B. Runtime exception is thrown An interface can contain only abstract method. D. can not say. Example, Operation interface implements Add class. The first concrete class should implement all the abstract methods of superclasses and interfaces. ExamTray is not Amazon.com Inc. accredited. Explanation: } Java MCQ Multiple Choice Questions and Answers Data Types and Variables Part 1, Java MCQ Multiple Choice Questions and Answers Data Types and Variables Part 2, Java MCQ Multiple Choice Questions and Answers Array Part 1, Java MCQ Multiple Choice Questions and Answers Array Part 2, Java MCQ Multiple Choice Questions and Answers Strings Part 1, Java MCQ Multiple Choice Questions and Answers Strings Part 2, Java MCQ Multiple Choice Questions and Answers Strings Part 3, Java MCQ Multiple Choice Questions and Answers Strings Part 4, Java MCQ Multiple Choice Questions and Answers OOPs. } public abstract class AbstractClassTest5 What is the output of the below Java program with an Interface? { The compiler shows an error. This is the java programming questions and answers section on "Java Interfaces" with an explanation for various interview, competitive examination and entrance test. 17) Java Interface static methods have ___ compatibility with the existing project code. How to Sort an Array of Strings in JavaScript. } abstract void show(); Study and learn Interview MCQ Questions and Answers on Java Interface. Here you can find Interfaces Questions and Answers. Test.java source code is: public class Test{ public static void main (String[] args){ System.out.println(Hello Test); } } Test1.java source code is : public class Test1{ public static void main (String[] args){ System.out.println(Hello Test1); } } you have issued below commands from command prompt. $ java interfaces public static void main(String[] args) Which of these can be used to fully abstract a class from its implementation? Which of the following package stores all the standard java classes? public class A { public void printName(){ System.out.println(Value-A); } } public class B extends A{ public void printName(){ System.out.println(Name-B); } } public class C extends A{ public void printName(){ System.out.println(Name-C); } } 1. public class Test{ 2. public static void main (String[] args) { 3. new ElectricBus().move(); Java Interface treats its variables like constants. It means, the existing project-code compiles as it is without asking for overriding the newly added Default method inside the Interface. Answer[=] B You can define a method in an interface, C Private and protected access modifiers can also be used to declare methods in an interface, C Declaration and definition of the method, Your email address will not be published. Java Interface Interview MCQ Questions and Answers 27) A Static method of an Interface should be accessed with _____ and a DOT operator. 26) A Superinterface is comparable to a Superclass. A) Interface contains only abstract methods by default.

Home java MCQ Java MCQ Interfaces Part 1. B b = new B(); 4. public void move() Answer[=] Which is the correct way to inherit and implement the interface? The concrete class implementing that method need not provide implementation of that method { Practice test for UGC NET Computer Science Paper. D) - Editor ed = new Office(); } Yes. au.print(); A Java class can implement multiple interfaces. A Java Class inherits Constants and Methods of an Interface using ____ keyword. { Choose the correct syntax below for defining an Interface in Java. 13.which of the following is true about methods in an interface in java? Java Interface static methods have ___ compatibility with the existing project code. Go through Certifications CENTER. System.out.println(A); 6. }

static final float PI = 3.1415f; C) inner class If 100% of methods in an abstract class are marked abstract, then it is comparable to an interface in Java. { So, it is backward compatible too. } 5) A Java Class inheritsConstants and Methods of an Interface using ____ keyword. A class Add implements Operation{}. } }, ExamTray D. None is correct. B) IMPLEMENTS public static void main(String[] args) } Find the given file. 21) The annotation used in Java to override the method of a super-class or interface by the subclass or implementing class is ___. C) class Office extends Author public static void main(String[] args) State TRUE or FALSE. 20) Is it possible to remove the keyword DEFAULT and make the method abstract again in an Interface, if the Interfacebelongs to a Closed-Source project? 2. and Answers as PDF files and eBooks. { Access specifier of interface is either public or no specifier. } Go through Java Theory Notes on Interface and Java 8 Default and Static Methods in Interfaces before reading these objective questions. Fully solved examples with detailed answer description. interface A { public void printValue(); } 1. public class Test{ 2. public static void main (String[] args){ 3. Required fields are marked *. { { } }, What is the output of the below Java program with multiple abstract classes? You can download these MCQs in PDF format by Choosing Print Option first and Save as PDF option next using any Web Browser. } 8. public static void newPrint(A a){ 9. a.printName(); 10. }



» Page not found

Page not found or has been removed. Please browse one of our other pages.

Top Slot Sites

Casino Titan

Casino Titan
There’s a free (no-deposit) $7 for new players at Casino Titan plus you also receive up to $3000 in new player Bonuses...

Play Now

Cinema Casino

Cinema Casino
Microgaming is behind another big successful online casino, Cinema Casino. Cinema Casino has over 200 casino games to choose from. This online casino is giving $1000 away for free to try their games and 60 minutes on the clock. ...

Play Now

WinPalace Casino

WinPalace Casino
WinPalace welcomes with an exclusive casino bonus of $1000 CASH ! Get a generous 200% bonus (up to $500) not only on your first but on your 2nd deposit too! This incredible bonus awards you with $1,000 in BONUS CASH! Good luck!...

Play Now

Slots Plus Casino

Slots Plus Casino
Slots Plus Casino have chosen Real Time Gaming software, which offers online players a great gaming experience, which is a step ahead of the rest. 125% welcome bonus is offered to New players at Slot Plus Casino! ...

Play Now

7 Sultans Casino

7 Sultans Casino
9 magical bonuses of $1000 await you at 7 Sultans Casino...

Play Now

Slots Jungle

Slots Jungle
Slots Jungle will match each of your first 10 deposits by 100% up to $1,000 for a grand total of $10,000. No other online casino offers you this much extra free cash to play with. So start cashing in today! To collect, simply redeem bonus code: JUNGLEWELCOME ...

Play Now

Contributors

We Recommend