public class AbstractClassTesting3 A directory of Objective Type Questions covering all the Computer Science subjects. Find the given file. System.out.println("Author method"); questions that you may have missed or have not yet answered. You can not instantiate an Interface in Java. class DoorBell extends Bell new InterfaceTest2().changePrice(); Certifications Boost Confidence. } A Java Class inherits Constants and Methods of an Interface using ____ keyword. C. The interface compiles successfully
}. }, ExamTray Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates. D. None is correct. Find the given file. Explanation: interface is inherited by a class using implements. public abstract class AbstractClassTest6 Web Worker allows us to. This GATE exam includes questions from previous year GATE papers. D. None of the above. D) All the above B) A Java class can implement multiple interfaces System.out.println(MathLibrary.PI); D. Implements. { { 10) All Interface methods in Java are ____ by default. B. ExamTray is not Amazon.com Inc. accredited. FALSE
void changePrice() }. public abstract class AbstractClassTest5 "); 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.
4) Choose a correct statement about Java Interfaces? C) Certifications Boost Confidence. You can define a constructor inside an Interface. System.out.println("Inside Constructor of Coffee.."); } 26) A Superinterface is comparable to a Superclass. { Here you can find Interfaces Questions and Answers. B. import
interface is inherited by a class using implements. 27) A Static method of an Interface should be accessed with _____ and a DOT operator. Interface contains only abstract methods by default. Open Certification Helper Popup Reset Popup. A Java Class inheritsConstants and Methods of an Interface using ____ keyword. B b = new B(); 4. Yes. public static void main(String[] args) Which of these can be used to fully abstract a class from its implementation? Explanation: In java, an interface contains only abstract method that can be public and it does not have any method implementation. 15) What is the output of the below Java program with an Interface? An interface can extends another interface or multiple interfaces. 19) The DEFAULT methods of an Interface are suitable mostly for ___ type of projects. { } Go through, Java Interface Interview MCQ Questions and Answers, Java 8 Default and Static Methods in Interfaces, 2. True. 11. A) abstract class public class InterfaceTest1
Which of the following is the correct way of implementing an interface salary by class manager? 18. B Explanation: Explanation: Constructor is not provided by interface as objects cannot be instantiated. The questions on this quiz might not appear Java Interface static methods have ___ compatibility with the existing project code. You can not use the keywords, private, protected, final and abstract, before a static method of an Interface.
interface Car abstract interface NAME A. int a=5; { Coffee() 3. { } C) An Interface can extend or inherit another Interface.
C) inner class
The abstract methods need to be implemented by concrete classes. Go through Certifications CENTER. Which of these keywords is used by a class to use an interface defined previously?
$ java interfaces
Which of the following is an incorrect statement about packages?
abstract class MathLibrary A) Interface contains only abstract methods by default. { C. implements
State TRUE or FALSE. } Explanation: Classes always implements an interface. 17. 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? 18) Java Interface DEFAULT methods have ___ compatibility with the existing project code. { The end-user of a Closed-Source project is the company itself that developed it. Which of the following is correct way of implementing an interface salary by class manager?
public interface NAME There is no need to explicitly mention ABSTRACT keyword to define an interface. Remember that "default" is a keyword.
Java Interface Interview MCQ Questions and Answers A class and an Interface have different inheritance rules. D. The interfaceName.variableName needs to be defined. Yes, static and default methods. }
operator directly. abstract class Coffee { A. Compilation failure
void move(); { A Java class can implement multiple interfaces. { 3) Choose the correct syntax below for defining an Interface in Java. True. The compiler shows an error. { } B. class Cat import IAnimal{}
State TRUE or FALSE. Just use Interface name and DOT (.) 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 static void main(String[] args) { Login To Like, Dislike, Follow Us or To Access Channel. D) anonymous class 13) What is the output of the below Java program with an Interface? 14) A Java Interface can not declare constructors. public class AbstractClassTesting4 C. Compilation failure
} 22) It is ___ to override the static method of an Interface in Java. What is the output of the below Java program with an Interface? Please disable your Ad-Blocker so we can earn from ads and keep this project alive. Which of these keywords is used to define interfaces in Java? C. The JVM is not able to identify the correct variable
}, What is the output for the below code? This collection of Java Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on Java Interfaces. C) Compiler error as teeth is a constant in Worm interface. D. The implementing class will throw exception. Which of these keywords is used by a class to use an interface defined previously? A. Compilation failure
Explanation: The JVM needs to distinctly know which value of variable it needs to use. void show() What is the output of the below Java code with an abstract class and inner class? We may get some affiliate commission for the above purchases. }, What is the output of the below Java program with an abstract class? { Attempt a small test to analyze your preparation level. 16. Solved examples with detailed answer description, explanation are given and it would be easy to understand. 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. 9) All Interface variables are ___ by default in Java.
You can print these Questions in default mode to conduct exams directly. Closed source projects can still introduce new features using the same keyword DEFAULT. abstract void show(); 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. D. can not say. A. abstract
C) An Interface can extend or inherit another Interface. public static void main(String[] args) You can download these MCQs in PDF format by Choosing Print Option first and Save as PDF option next using any Web Browser. Access specifier of interface is either public or no specifier. An abstract class with 100% abstract methods is equivalent to ______. You should not use object references to access the static method of an Interface. 13.which of the following is true about methods in an interface in java? Which is the correct way to inherit and implement the interface? D State TRUE or FALSE. 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. 11) A Class implementing an Interface can use ____access modifier before the implemented methods. { 1) An interface in Java is like a 100% ____. B. Interfaces specifies what class must do but not how it does
An interface in Java is like a 100% ____. B. static
2021 All rights reserved. A) Interface contains only abstract methods by default. }; 8. a1.printValue(); 9. } 8. public static void newPrint(A a){ 9. a.printName(); 10. } 4. public static void main(String args[]) } All Interface variables are ___ by default in Java. It means, the existing project-code compiles as it is without asking for overriding the newly added Default method inside the Interface. D. none of the mentioned. B. Runtime Exception
The questions asked in this NET practice paper are from various previous year papers. This is a practice quiz. void print() B) IMPLEMENTS { { Answer[=] { 6.
{ Practice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews. If 100% of methods in an abstract class are marked abstract, then it is comparable to an interface in Java.
A) INTERFACE 24) Which is the missing java code in the class implementing an Interface below? What type of methods an interface contain by default? { Questions from Previous year GATE question papers, UGC NET Previous year questions and practice sets. { 2) A Java Interface is not considered a class. { }, What is the output of the below Java program with multiple abstract classes? A) 6) What is the output of the below Java program with an Interface? } abstract class Editor
} 25) Which is the missing code to successfully compile the below Java program with abstract classes and Interfaces? class Office extends Author AllIndiaExams provides you lots Interfaces Questions and Answers with proper explanation. Hence, answer would be A. The first concrete class should implement all the abstract methods of superclasses and interfaces. Java Interface treats its variables like constants. Which of these access specifiers can be used for an interface?
System.out.println("DoorBell ringing.."); Answer[=] System.out.println("Editor method");
3) Choose the correct syntax below for defining an Interface in Java. Required fields are marked *. Copyright 2021 Quizack . 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?