B. import C. class Cat extends IAnimal{} class ElectricBus implements Bus 22) It is ___ to override the static method of an Interface in Java. Explanation: ExamTray is not Amazon.com Inc. accredited. interface A { public void printValue(); } 1. public class Test{ 2. public static void main (String[] args){ 3. You can define a constructor inside an Interface. Go through Certifications CENTER. { 16. The end-user of a Closed-Source project is the company itself that developed it. Fully solved examples with detailed answer description. Attend job interviews easily with these Multiple Choice Questions. What is the output of the below Java program with an abstract class? 19. Which of these keywords is used to define interfaces in Java? public abstract class AbstractClassTest5 } A. 10) All Interface methods in Java are ____ by default. { } } Choose a correct statement about Java Interfaces? 27) A Static method of an Interface should be accessed with _____ and a DOT operator. Web Worker allows us to. The compiler shows an error. A System.out.println(A); 6. } }; 8. a1.printValue(); 9. } So, it is backward compatible too. abstract interface NAME basePrice = 2000; 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also be used to declare methods in an interface, C Declaration and definition of the method, Your email address will not be published. Open Source projects do not know how many organizations or users have been dependent on the project. Java Interface Interview MCQ Questions and Answers An interface can extends another interface or multiple interfaces. public abstract class AbstractClassTest6 { FALSE }, ExamTray }, 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. Practice test for UGC NET Computer Science Paper. Study and learn Interview MCQ Questions and Answers on Java Interface. Your email address will not be published. Can "abstract" keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block. abstract void show(); public class AbstractClassTesting3 Just use Interface name and DOT (.) Here you can find Interfaces Questions and Answers. State TRUE or FALSE. 4. 8) What is the output of the below Java program with an Interface? 17. 11) A Class implementing an Interface can use ____access modifier before the implemented methods. }

Yes. { interface Car public class AbstractClassTesting4 D

Explanation: All methods and variables are implicitly public if interface is declared public. } { } Go through Java Theory Notes on Interface and Java 8 Default and Static Methods in Interfaces before reading these objective questions. public static void main(String[] args) C. implements You can not use the keywords, private, protected, final and abstract, before a static method of an Interface. So, using the keyword "new" does not create new objects of an Interface. { You can submit your quiz responses at any time. 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? 18) Java Interface DEFAULT methods have ___ compatibility with the existing project code. D. private. System.out.println("DoorBell ringing..");

9) All Interface variables are ___ by default in Java. }, What is the output of the below Java program with multiple abstract classes? The existing classes still do not utilize these new static methods of the interface. "); Solved examples with detailed answer description, explanation are given and it would be easy to understand. C) An Interface can extend or inherit another Interface. } We can define a method in an interface 3. B) FALSE Make your choice by clicking on its button. A Java Class inherits Constants and Methods of an Interface using ____ keyword. 6) What is the output of the below Java program with an Interface? Explanation: The JVM needs to distinctly know which value of variable it needs to use. System.out.println("Inside Main() method.."); Required fields are marked *. B. class manager implements salary {} { What is the output for the below code? public class InterfaceTest2 implements Car D) - Answer[=] { C. The JVM is not able to identify the correct variable

26) A Superinterface is comparable to a Superclass. D. Method not found exception is thrown, Explanation: The methods of interfaces are always abstract. IMPLEMENTS keyword 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? An abstract class with 100% abstract methods is equivalent to ______. An interface can contain only abstract method. The number you got right: In other words, these are constants. cd javaproject java Test Test1 What is the output? public static void main(String[] args) C. The interface compiles successfully { 6) What is the output of the below Java program with an Interface? Editor ed = new Office(); choose the single best answer. 8. public static void newPrint(A a){ 9. a.printName(); 10. } public static void main(String[] args) B. Runtime Exception Explanation: Constructor is not provided by interface as objects cannot be instantiated. B. static abstract void print(); Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates. What happens when a constructor is defined for an interface? Not possible to override the static method. Explanation: No, Constructor, Static Initialization Block, Instance Initialization Block and variables cannot be abstract. Import {

A Java Interface is not considered a class. ed.show(); All students, freshers can download Interfaces Questions True. 7) What is the output of the below Java program with an Interface? A. Compilation failure in any quiz or test that does count toward your grade. 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. Percent Correct: A Class implementing an Interface can use ____ access modifier before the implemented methods. 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; } }. System.out.println("Implemented move() method. 3) Choose the correct syntax below for defining an Interface in Java. //abstract methods { 2) A Java Interface is not considered a class. System.out.print("Inner class is present.."); Here you can access and discuss Multiple choice questions and answers for various competitive exams and interviews. Find the given file. Study and learn Interview MCQ Questions and Answers on Java Interface. What is the output of the below Java program with an Interface? So, you need not add these keywords again while writing the program. Attend job interviews easily with these Multiple Choice Questions. { Before you submit the quiz, you will have the opportunity to return to This collection of Java Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on Java Interfaces. abstract class Author extends Editor }. 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. A directory of Objective Type Questions covering all the Computer Science subjects. System.out.print(basePrice); class DoorBell extends Bell System.out.println(MathLibrary.PI); 5) A Java Class inherits Constants and Methods of an Interface using ____ keyword. C. class manager extends salary {} D. The implementing class will throw exception. Home java MCQ Java MCQ Interfaces Part 1. void print() Explanation: By default, interface contains abstract methods. } Choose a correct implementation of an Abstract class in the below Java code? A. If 100% of methods in an abstract class are marked abstract, then it is comparable to an interface in Java. Without the keyword DEFAULT, the project build fails. This GATE exam includes questions from previous year GATE papers. { public interface NAME ColdCoffee() } void show() What is the output of the below Java program with an Interface? { $ javac interfaces.java { { Yes. C) An Interface can extend or inherit another Interface.

We may get some affiliate commission for the above purchases. { class Anonymous B. Runtime exception is thrown What is the output of the below Java code with an abstract class and inner class? C. Compilation failure 7. 13) What is the output of the below Java program with an Interface? A class Add implements Operation{}. Which of these access specifiers can be used for an interface? interface NAME Questions from Previous year GATE question papers, UGC NET Previous year questions and practice sets. public static void main(String[] args) 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? D. none of the mentioned. Choose the correct syntax below for defining an Interface in Java. } D C) inner class It is optional. AllIndiaExams provides you lots Interfaces Questions and Answers with proper explanation. B. Yes, static and default methods. B { System.out.println("Author method"); 1. So, the classes implementing Interfaces, can not reassign values to the variables. A An interface can only contain abstract methods. { Please disable your Ad-Blocker so we can earn from ads and keep this project alive. What type of methods an interface contain by default? { 14) A Java Interface can not declare constructors. So, it is advised to take advantage of the DEFAULT methods of an Interface to introduce new features. final abstract class Bell Choose a correct statement about abstract classes, Choose correct statements about an Abstract class in Java. State TRUE or FALSE. D. The interfaceName.variableName needs to be defined. void move(); B) A Java class can implement multiple interfaces { } All Interface variables are ___ by default in Java. D. None is correct. A class and an Interface have different inheritance rules. 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. 21) The annotation used in Java to override the method of a super-class or interface by the subclass or implementing class is ___. 12) A Java Class implementing an Interface can define a variable with the same name as that of the Interface constant. 4) Choose a correct statement about Java Interfaces? Example, Operation interface implements Add class. 1) An interface in Java is like a 100% ____. Answer[=] The questions asked in this NET practice paper are from various previous year papers. }, What is the output of the below Java program with an abstract class? Practicing these interview questions, you can easily crack any Exams interview. int a=5; } { 7. 16) Java 8 (Java 1.8) introduced the ___ feature. 1) An interface in Java is like a 100% ____. C c = new C(); 5. b = c; 6. newPrint(b); 7. } } Which of the following package stores all the standard java classes? The abstract methods need to be implemented by concrete classes. Coffee() }, 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? int basePrice=1000; 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. 12. Letter Grade. 20. abstract class Editor How to Sort an Array of Strings in JavaScript. State TRUE or FALSE. Find the given file. new ElectricBus().move(); You can download these MCQs in PDF format by Choosing Print Option first and Save as PDF option next using any Web Browser. } and Answers as PDF files and eBooks. Hence, answer would be A. void changePrice() C. All variables in interface are implicitly final and static B) Explanation: interface is inherited by a class using implements. Yes. A) INTERFACE } 4. You can change your answers at any time. 17) Java Interface static methods have ___ compatibility with the existing project code. State TRUE or FALSE. 18. { 2) A Java Interface is not considered a class. All the new Classes start implementing these default methods. 5. They provide only method definition. interface is inherited by a class using implements. B. class Cat import IAnimal{} Java Interface treats its variables like constants. //abstract methods B) public class Which is the correct way to inherit and implement the interface? Which of the following is incorrect statement about packages? Interface contains only abstract methods by default. Login To Like, Dislike, Follow Us or To Access Channel.

{ 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. Which of the following is an incorrect statement about packages? What happens when we access the same variable defined in two interfaces implemented by the same class? Yes, public and final. Author au = new Office(); System.out.println("Inside Constructor of ColdCoffee.."); A. abstract A. class manager imports salary {} 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? Explanation: Evaluate your skill level in just 10 minutes with QUIZACK smart test system.

C) True. 6. { B. You can print these Questions in default mode to conduct exams directly. You can download these MCQs in PDF format by Choosing Print Option first and Save as PDF option next using any Web Browser. All Interface methods in Java are ____ by default. D. All variables are static and methods are public if interface is defined pubic. Certifications Boost Confidence. If 100% of methods in an abstract class are marked abstract, then it is comparable to an interface in Java. To avoid confusion to the JVM interfaceName.variableName is mandatory. D) All the above Output: Which of these keywords is used by a class to use an interface defined previously? Practice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews. }

Explanation: }. C. final { new InterfaceTest2().changePrice(); TRUE 14. D. can not say.

{ { Attempt a small test to analyze your preparation level. } C) Compiler error as teeth is a constant in Worm interface. The results are not recorded anywhere and do not affect your grade. B) IMPLEMENTS { Only a "public" access modifier is allowed. By 2021 All rights reserved. A) Interface contains only abstract methods by default. Answer[=] Forward compatibility means, the implementing classes may be modified to access these static methods. For each question, 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. A Java class can implement multiple interfaces. System.out.println("Editor method"); A) TRUE 11. //abstract methods Open Certification Helper Popup Reset Popup. B. Interfaces specifies what class must do but not how it does public static void main(String[] args) C. Can be true or false 25) Which is the missing code to successfully compile the below Java program with abstract classes and Interfaces?

} { D) All the above D. None of the above. Explanation: Classes always implements an interface. Interface automatically marks all its methods as public and abstract. operator directly. You can reassign an interface's constant. public void move() Go through Java Theory Notes on Interface and Java 8 Default and Static Methods in Interfacesbefore reading these objective questions. A) Interface contains only abstract methods by default. class ColdCoffee extends Coffee } 15. 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. } } Core Java: An Integrated Approach, Black Book. A) abstract class Go through, Java Interface Interview MCQ Questions and Answers, Java 8 Default and Static Methods in Interfaces, 2. } public static void main(String args[]) It means, the existing project-code compiles as it is without asking for overriding the newly added Default method inside the Interface. }. A. Compilation failure A) You can print these Questions in default mode to conduct exams directly. 5) A Java Class inheritsConstants and Methods of an Interface using ____ keyword. abstract class MathLibrary B) A Java class can implement multiple interfaces. D) All the above 3) Choose the correct syntax below for defining an Interface in Java. { A Java Class inheritsConstants and Methods of an Interface using ____ keyword. { Answer[=] questions that you may have missed or have not yet answered. Closed source projects can still introduce new features using the same keyword DEFAULT. { static final float PI = 3.1415f; What will happen if we provide concrete implementation of method in interface? Quizack provides Online Quiz and Practice MCQs for Free. DoorBell() There is no need to explicitly mention ABSTRACT keyword to define an interface. A a1 = new A() { 4. public void printValue(){ 5. You should not use object references to access the static method of an Interface. A. C) - }, What is the output for the below code? public class AbstractClassTesting It does not throw exceptions. ou have two class files name Test.class and Test1.class inside javaproject directory. 13.which of the following is true about methods in an interface in java? A. Interfaces are specified public if they are to be accessed by any code in the program

public static void main(String[] args) ColdCoffee cf = new ColdCoffee(); This is the java programming questions and answers section on "Java Interfaces" with an explanation for various interview, competitive examination and entrance test. B b = new B(); 4. } class Office extends Author Which of these keywords is used by a class to use an interface defined previously? $ java interfaces Which of the following is correct way of implementing an interface salary by class manager? A. 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(); } }. What will be the result of compiling the following code: public class SuperClass { public int doIt(String str, Integer data)throws Exception{ String signature = (String, Integer[]); System.out.println(str + + signature); return 1; } } public class SubClass extends SuperClass{ public int doIt(String str, Integer data) { String signature = (String, Integer[]); System.out.println(Overridden: + str + + signature); return 0; } public static void main(String args) { SuperClass sb = new SubClass(); sb.doIt(hello, 3); } }, What is the output for the below code? D. Implements. Answer[=] { public class AbstractClassTesting2 10. } 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. 11. A. class Cat implements IAnimal{} You can define a variable with the same name in the implementing class. abstract class Coffee Choose the correct syntax below for defining an Interface in Java. Explanation: { } interface Bus This is a practice quiz. } Access specifier of interface is either public or no specifier. {

Bell bell = new DoorBell(); B. Runtime Exception An Interface can extend or inherit another Interface. The concrete class implementing that method need not provide implementation of that method C) EXTENDS au.print(); 19) The DEFAULT methods of an Interface are suitable mostly for ___ type of projects. 4) Choose a correct statement about Java Interfaces? package com.concretepage; enum Day { MON("1"), TUE("2"), WED("3"); String s; Day(String s) { this.s = s; } } public class Test { static Day d; public static void main(String[] args) { System.out.println(d.MON.s + " " + d.TUE.s); } } What is the result? 15) What is the output of the below Java program with an Interface? An interface in Java is like a 100% ____. Certifications Boost Confidence. Instructions: D) anonymous class