Which of the following is false about Constructors ? If we try to add duplicate key to the HashMap, What will happen ? Which of the following is not valid var args declaration ? Q44. Q9.

A non-abstract class that implements an

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Q1. It is good practice to represent final variables in all uppercase, using underscore to separate words. An interface can define and use instance variables. Note: As discussed above, a final variable cannot be reassign, doing it will throw compile-time error. Which of the following file is called deployment descriptor ? When you code a class that implements an interface, you dont A class that ______________ an interface must contain methods Beginning Java with NetBeans: Chapter 12 interface? Q13. b. Rentalrental = new Rental(); Printable p = rental; 3. Q42. c. A class can only implement one interface. 5. Q3. a. correct answers cell] Which is of the following is NOT TRUE for JVM ? Which of the following collection maintain its elements in Natural Sorted order ? Which of the following

Get access to ad-free content, doubt assistance and more! are final classes. Which interface does java.util.Hashtable implement ? interface. What happens when the Q6. 11. Which of the collections allows null as the key ? Which of the following is not true for final variables ? 4. c. implemen.

But in the case of a reference final variable, the internal state of the object pointed by that reference variable can be changed. A final method cannot be overridden. One can not make a class immutable without making it final. For example, all Wrapper Classes like Integer, Float, etc. Which of the following can be marked static ? a. 8. b. Which of the following was not introduced with Java 5 ? If the final variable is a reference, this means that the variable cannot be re-bound to reference another object, but the internal state of the object pointed by that reference variable can be changed i.e. 2. c. Printablep = new Printable(); We can not instanciate interface 3. c. A runtime error occurs because printInvoice cant accept Rental objects. 7. An interface can contain instance variables. b.

Please see the abstract in java article for differences between the final and abstract. Rental objects. interface can be declared as which of the following data (Refer to code example 12-1.) d. A class can implement multiple interfaces. This article is contributed by Gaurav Miglani. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Similarities and Difference between Java and C++, Decision Making in Java (if, if-else, switch, break, continue, jump), StringBuilder Class in Java with Examples, Object Oriented Programming (OOPs) Concept in Java, Constructor Chaining In Java with Examples, Private Constructors and Singleton Classes in Java, Comparison of Inheritance in C++ and Java, Dynamic Method Dispatch or Runtime Polymorphism in Java, Different ways of Method Overloading in Java, Difference Between Method Overloading and Method Overriding in Java, Difference between Abstract Class and Interface in Java, Comparator Interface in Java with Examples, Flow control in try catch finally in Java, SortedSet Interface in Java with Examples, SortedMap Interface in Java with Examples, Importance of Thread Synchronization in Java, Thread Safety and how to achieve it in Java, Difference between final, finally, and finalize in Java, You can initialize a final variable when it is declared. If we add Enum constants to a sorted collection ( Treemap , TreeSet ), What will be the order in which they will be maintained ? Which keyword is used to provide explicit access of a code block to single thread ? There are three ways to initialize a final variable: Let us see these two different ways of initializing a final variable: Geeks there was no main method in the above code as it was simply for illustration purposes to get a better understanding in order to draw conclusions: Observation 1: When to use a final variable? Required fields are marked *. Which of the following is not the difference between Singleton and Static class ( Class with static members only ) ?

Overridden methods must have the same Q22. By using our site, you The Object class does thisa number of its methods are final. a. b. 4. Which of the following collections stores its elements in insertion Order ? If an interface inherits another interface, what All the variables of interface should be? class can implement multiple interfaces. The only difference between a normal variable and a final variable is that we can re-assign the value to a normal variable but we cannot change the value of a final variable once assigned. Q26. When a class is declared with final keyword, it is called a final class. your contribution is highly appreciated. Q32. interface, a. can use any constants defined by the interface, b. must provide an implementation for each abstract method (Refer to code example 12-1.) i) to be used to represent multiple variables. Q12.

Q23.

An interface can contain abstract methods.

c. An interface can contain static constants. Related Interview Question(Important): Difference between final, finally, and finalize in Java.

public static void printInvoice(Printable p) {, public class Rental extends Transaction implements This also means that you must initialize a final variable. Q11. Remember the below key points as perceived before moving forward as listed below as follows: Output explanation: Since the i variable goes out of scope with each iteration of the loop, it is actually re-declaration each iteration, allowing the same token (i.e.

Experts are tested by Chegg as specialists in their subject area. Illustration: Final keyword with a method, For more examples and behavior of final methods and final classes, please see Using final with inheritance. Usage 2: The other use of final with classes is to create an immutable class like the predefined String class. Collections & Mathematical Functions Mcqs, Interfaces,Inheritance & Polymorphism Mcqs, Java Operators and Control Statements Mcqs, Compressors & Turbines & Jet Engines Mcqs, Applied Mechanics and Graphic Statics Mcqs, Construction Planning and Management Mcqs.

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Q41. Which of the following cannot be marked static ? The interface that the object implements, c. Any subclass of the class that defines the object. If you think the posted answer is wrong or Confused About the Answer? Hence final variables must be used only for the values that we want to remain constant throughout the execution of the program. Q29. Q10. Q19. A variable that stores an object that implements an d. A class can. Q40.

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Q2. defined by the.

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Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Effective Java 6 , TreeMap implements Q34. Private vs Protected vs Final Access Modifier in Java, Effectively Final Variable in Java with Examples, Protected vs Final Access Modifier in Java, Comparison of static keyword in C++ and Java, JAVA Programming Foundation- Self Paced Course, Complete Interview Preparation- Self Paced Course. MULTIPLE CHOICE [Answers are in tables delete all but the generate link and share the link here. Which of the following statements is Why a Constructor can not be final, static or abstract in Java? 2003-2022 Chegg Inc. All rights reserved. Q37. A final class cannot be extended(inherited). Q21. e. A class can inherit another class and implement an This property of final is called non-transitivity. A method that accepts an interface as an argument can Which of the following is not the use of this keyword ? With Java 8 and later, what keyword can you use to Variables of an interface are intrinsically Q39.

Q17. A class can only directly inherit ________ other class, but a Strings in switch were introduced in Which Java version ?

See below program for local final variable.

What state does a thread enter when it terminates its processing?

keyword do you use to specify the inherited interface? 1. console. We must declare methods with the final keyword for which we are required to follow the same implementation throughout all the derived classes. We review their content and use your feedback to keep the quality high. Invoking start twice on same thread leads to .. Q43. you can add or remove elements from the final array or final collection. b. true? What is the size of long data type ? Which of the following is usually not part of EAR file ? Which of the following statements is not a. c. A runtime error occurs because printInvoice cant accept For example, a final StringBuffer variable looks defined below as follows: As we all know that a final variable cannot be re-assign. code that follows is executed? We must initialize a final variable, otherwise, the compiler will throw a compile-time error. Q35. 9. Which of the following annotation is used to avoid executing Junits ? If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. Q7. accept any object that, b. defines the same methods as the interface, c. implements the interface or defines the same methods as the A final variable is called a, A blank final variable can be initialized inside an, A blank final static variable can be initialized inside a. Note that this is not re-assigning. Q46. 10. must be declared as abstract.

See your article appearing on the GeeksforGeeks main page and help other Geeks. 6. How many bits are used to represent Unicode ? Printable { public void print() {. 1. Ask for Details Here. Which of the following exception is thrown when we try to access element which is beyond the size ?

Q18. 1. b. Q25. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. An interface can contain abstract methods. code a static method in an interface? Q30. Which of the following is false about var args ? We can not extend them. c. An interface can contain static constants. What is the initial state of a thread when it is created and started ?

The following are different contexts where final is used. Printing invoice is printed to the console. correct answers cell]. How to work with interfaces An interface can contain instance variables. types? Add it Herewell review your comment and contact you soon. Collections.sort can only be performed on .. Q33. Unreachable statement using final and non-final variable in Java, Assigning values to static final variables in Java, Static and non static blank final variables in Java, Difference between Final and Abstract in Java. When a method is declared with final keyword, it is called a final method. When a variable is declared with the final keyword, its value cant be modified, essentially, a constant. Otherwise, the class In what order the elements of a HashSet are retrieved ? interface. Which of the following is false about main method ? Remember: When a final variable is created inside a method/constructor/block, it is called local final variable, and it must initialize once where it is created. final keyword is used in different contexts. Q24. you use in the class declaraction to specify that need to implement its ___________ methods. To understand what is meant by the internal state of the object as shown in the below example as follows: The non-transitivity property also applies to arrays, because arrays are objects in Java. Which of the following class creates mutable objects ? A class that implements an interface can use any ____________ A final variable can only be initialized once, either via an initializer or an assignment statement. An interface can contain instance variables. When a final variable is a reference to an object, then this final variable is called the reference final variable. First of all, final is a non-access modifier applicable only to a variable, a method, or a class. Q4. Which of the following statements is not Printing invoice and Rental object are printed to the statements will definitely not compile? Q8. Which of the following doesn't extend Collection interface . Which access specifiers can be used with top level class ? called a ____________ interface. public class Printer { Know Explanation? Q20. 2. How can we execute a Java class independently if it doesn't have a static main method ? code a regular (non-static) method in an interface? for all abstract methods in the interface.

This approach is the most common. Q16.

Q38. Which of the following is not type of inner classes ? Usage 1: One is definitely to prevent inheritance, as final classes cannot be extended. Come write articles for us and get featured, Learn and code with the best industry experts. true? Q36. Arrays with the final keyword are also called final arrays. Which of the following is false for final ? defined by that interface without declaring it. An interface that doesnt contain any constants or methods is With Java 8 and later, what keyword can you use to true? If a class implements one interface, what keyword do