Software Programming : Java Programming QUESTIONS AND ANSWERS :: part1 : 1 to 5. public C2(){ 3. . Can an internal force accelerate a body? } }, What is the output of the following program code? public Base(){ Typescript allows an interface to inherit from multiple interfaces. } Interfaces can have default methods with implementation in Java 8 on later. Explanation : An interface can extend another interface but not implement. All Rights Reserved. Whether you implement this in a base class or in the lowest subclass doesnt matter. Previous year online test Software Programming Java Programming are available at free of cost. An interface can implement many interfaces. a = foo(a,s); Color.blue On many keyboards, the break key is also the ____ key. -4 + 1/2 + 2*-3 + 5.0. Yes you can inherit or extend one abstract class to another abstract class but if the class is a sealed class or single ton class at that time only inheritance cant be applicable. In case of a class , the super class is object class.

A class can extend only one abstract class while a class can implement multiple interfaces. You can find previous year Software Programming Java Programming Questions and answers in Exam2win.com. What is different about extending from an abstract class vs implementing an interface? The extends keyword is used to extend an interface, and the child interface inherits the methods of the parent interface. An interface cannot contain the signature of an indexer. An interface can be extended by other interfaces. System.out.println("a="+a+" s="+s); You can get Software Programming Java Programming Questions and answers in Exam2win.com, You can get Software Programming 2010, 2011, 2012 Entrance Exam Questions and answers in Exam2win.com. https://quizack.com/java/mcq/java-interfaces-can-extend, Note: This Question is unanswered, help us to find answer for this one. Explanation : Color.red } } When a class implements the inherited interface then it must provide the implementation of all the members that are defined within the interface inheritance chain. nothing: extension is not valid for interfaces. Quizack provides Online Quiz and Practice MCQs for Free. An interface can extends another interface or multiple interfaces. If there is no default or common behaviour among all the classes that are inheriting from abstract class then interface may be a better choice. An interface may not implement any other interface. It can only extend it. Please disable your Ad-Blocker so we can earn from ads and keep this project alive. Bank General Knowledge - Online Test 6 Note: An interface can extend any number of interfaces at a time. An interface can extend another interface in the same way that a class can extend another class. class C2 extends C1{ In case both the implemented interfaces contain default methods with the same method signature, the implementing class should explicitly specify which default method is to be used, or it should override the default method. A class that implements an interface can explicitly implement members of that interface. } Note: A class can extend a class and can implement any number of interfaces simultaneously. An interface can extend multiple interfaces. "X extends Y" is correct if and only if X is a class and Y is an interface, B. It cannot support multiple inheritance. 1. Can interface inherit from abstract class C#? Can a class extend multiple abstract classes? This means that an interface can inherit the members of a class but not their implementation. (Notice the integer division) 2021 All rights reserved. And a class can implement two or more interfaces. } However, there is the advantage of using an interface over an abstract class; that is Multiple Inheritance Support.

In C#, namespaces are used to logically arrange classes, structs, interfaces, enums and delegates. 13. No, we cant declare variables, constructors, properties, and methods in the interface. Note: The class implementing the interface must declare all methods in the interface with a compatible signature. public static void bar() Interfaces cannot be instantiated, but rather are implemented. Remember, a Java class can only have 1 superclass, but it can implement multiple interfaces. More Java Programming QUESTIONS AND ANSWERS available in next pages, Bank General Knowledge - Online Test 1 Interfaces can be extended like classes using the extends operator. Which of the following statements is correct about an interface? After the above piece of code is executed, what are the colors of r1 and Rectangle r2 = r1; Can an interface extend an abstract class C#? opt 5 None of the above. System.out.println(3); And whereas a class can extend only one abstract class, it can take advantage of multiple interfaces. It can implement functions with non-Abstract methods. A class can extend only one class but many interfaces. Just like object-oriented languages such as Java and C#, TypeScript classes can be extended to create new classes with inheritance, using the keyword extends . Abstract classes are typically used as base classes for extension by subclasses. Can an interface extend another interface typescript? An interface defines how a class should look like (as a bare minimum). Default methods were introduced to provide backward compatibility for old interfaces so that they can have new methods without affecting existing code. The purpose of one interface extending, not implementing another, is to build a more specific interface. Structures cannot inherit a class but can implement an interface. Thus, if a class already has a different superclass, it can implement an interface, but it cannot extend another abstract class. It contains only method signatures. r2.setColor(Color.red); new Derived(); If you try to override a static method of an interface by defining a similar method in the implementing interface, it will be considered as another (static) method of the class. The following code causes java to throw ________. Ans:3 Color.red Interfaces specify what a class must do and not how. The functions declared in an interface have a body. Interfaces can have static methods as well, similar to static methods in classes.

System.out.print(s); } Rectangle r1 = new Rectangle(); Explanation : Private members of a class can be accessed by the methods within the same class. . Interface cannot contain fields because they represent a particular implementation of data. 2009 - 2022 by IndiaBIX Technologies. { s = "Yellow"; That is, Java supports a limited form of multiple inheritance. Since multiple inheritance is not supported in C#, you cannot inherit your class from two abstract classes. Which is the wildcard symbol for use in generic type specification? Use the extends keyword to implement inheritance among interfaces. 3.Consider the following code fragment A class that implements a derived interface must implement all members in the derived interface, including all members of the derived interfaces base interfaces. r2 (in this order)? That is, an interface may not be based on a class. An interface only allows you to define functionality, not implement it. You can only do one which is fine. System.out.print(1); Bank Model question Paper - Online Test 1 The compiled code will be exactly the same whether these methods are there or not. Previous year Software Programming Java Programming Questions and answers are available. A. Can an abstract class inherit another abstract class C#? That means one namespace can contain other namespaces also. Practice in Online Tests helps you to improve your ability to attend the real time online tests or other competitive exams like Maths, Physics, Chemistry Exam 2013, 2014, 2015 within the given duration. Can we override static method of interface? Software Programming Java Programming Question and Answers are available in Tamil Language. Yes you can inherit abstract class from another abstract class. { int a=3; public class Derived extends Base{ class Base{ Static Methods in Interface are those methods, which are defined in the interface with the keyword static. An interface can implement multiple classes. If a class implements an interface partially, then it should be an abstract class. A class that implements an interface must implement all of the non-default methods described in the interface, or be an abstract class. C# allows the user to inherit one interface into another interface. 5. Java interfaces cannot extend classes, which makes sense since classes contain implementation details that cannot be specified within an interface.. Interfaces can inherit from one or more interfaces. Can I inherit one interface from another interface if yes how if no why? Interfaces members are automatically public. Can an interface extend another interface Mcq? What is the result of compiling and running the following code? Exam2win provides you Software Programming Java Programmings Questions and answers in online test mode. Evaluate your skill level in just 10 minutes with QUIZACK smart test system. One interface can be implemented in another interface. How many interfaces can a class inherit and can a same interface be inherited by 2 different classes explain it?

public static void main(String[] args){ Copyright 2021 Quizack . Which of the following statements are correct about an interface in C#.NET? Hence multiple interfaces can be inherited. } A class can extend more than one class. int number = integer.max_value + 1; The class used as a basis for inheritance is the ____ class. An abstract class cannot be inherited by structures. In other words, an interface can inherit from other interface. Following Software Programming language Entrance Multiple choice objective type questions and answers will help you in Software Programming 2015 examinations : ANSWER : An interface can implement another interface. In Java, it cannot. "X extends Y" is correct if and only if X is an interface and Y is a class, C. "X extends Y" is correct if X and Y are either both classes or both interfaces, D. "X extends Y" is correct for all combinations of X and Y being classes and/or interfaces. 6 Answers. Object (the root class of the Java type system); multiple inheritance of classes is not allowed. In C#, two classes (either abstract or concrete) cannot be inherited by the same derived class. In C#, an interface may not extend a class. can internal forces do work. } } No answer description available for this question. What is printed on execution of these methods? Which of the following is the correct implementation of the interface given below? Bank General Knowledge - Online Test 3 Which operator is used for extending interface? System.out.print("Derived"); 5.What is the type and value of the following expression? this("Examveda"); public Derived(){ An interface can extend multiple interfaces. -4 + 0 + -6 + 5.0; // integer division: 1/2 truncates .5 System.out.print(2); The static attribute can be used with a method that implements an interface declaration. A class cannot implement an interface partially. In C#, the extension method concept allows you to add new methods in the existing class or in the structure without modifying the source code of the original type and you do not require any kind of special permission from the original type and there is no need to re-compile the original type. Can interface inherit multiple interfaces? Can an interface extend another interface PHP. But interfaces will contain only the declaration of the members. 2.Which statement is not true in java language? can you give simple example of An interface can extend many interfaces? What happens when interface extends another interface? Which of the following is true? Explanation : The execution goes on like this: To register a source for an action event with a handler, use ________. Bank General Knowledge - Online Test 4 2. Can you inherit multiple abstract classes in C#? class C3 extends C2{ } A class can extend one class and implement many interfaces. Explanation : a value is returned from the method and so it is 5. Similar to Default Method in Interface, the static method in an interface can be defined in the interface, but cannot be overridden in Implementation Classes. new C3(); Can an interface extend another interface C#? An interface in Java is syntactically similar to a class but can have only abstract methods declaration and constants as members. { bar(); } Since the implementation classes will have all the methods with a body, it is possible to create an instance of implementation classes. abstract class C1{ No. -10 + 5.0; // higher type is double 5.0, so -10 is casted to double a=a+2; return a; } public static void main(String args[]) However, a class can only extend a single class. 4. Which of the following statements is correct about an interface used in C#.NET? You have to practice regularly by attempting the various online test Software Programming Java Programming question paper available here. 3rd statement is correct because there is no parent class for interface. r1.setColor(Color.blue); No you can not declare variable in interface. Like a class, Interface can have methods, properties, events, and indexers as its members. The derived interface inherits the members from its base interfaces.

} Multiple interface inheritance is not allowed. public static void main(String[] a){ | Copyright | Terms of Use & Privacy Policy, Contact us: info.india- @ -bix@gma@il.com. -5.0; // finally, double -5.0. A class can implement multiple interfaces. It can contains constructors or destructors. Careful how you use the words extends and implements when talking about interface and class . A class can implement multiple interfaces. An interface is not a class. Bank Numerical Ability - Online Test 1, If you are not willing to risk the usual you will have to settle for the ordinary- Jim Rohn, Copyright 2010-2021 Exam2Win, All rights reserved, Bank Model question Paper - Online Test 1. Can interface be extended to another interface? Technically speaking, interfaces dont inherit from each other. public class SomeClass { public static void main(String[] args) { System.out.println((String)null); } } What is the result of the following program? Reason: Both r1 and r2 are referring the same object of Rectangle class. An abstract class permits you to make functionality that subclasses can implement or override whereas an interface only permits you to state functionality but not to implement it. String s = "Blue"; public class Test{ Software Programming Java Programming online test helps you to enhance your learning ability by practice the given tests. It is the blueprint of the class. In the above example, the Employee class extends the Person class using extends keyword. }. public static int foo(int a, String s) In C#, namespaces are used to logically arrange classes, structs, interfaces, enums and delegates. public Derived(String s){ ANSWER : A private member of a class cannot be accessed by the methods of the same class. An interface can be implemented by multiple classes in the same program. -4 + 1/2 + 2*-3 + 5.0; public C3(){ But the string will remain same, as it is passed by value to the method. When a class inherits an interface it inherits member definitions as well as its implementations. TypeScript interfaces can extend classes. In fact, if you need more shared code, make sure to focus on using traits instead. } Hence, answer would be A. A class can extend at most one abstract class, but may implement many interfaces. Like a class, an interface can have methods and variables, but the methods declared in an interface are by default abstract (only method signature, no body). To implement an interface member, the corresponding member in the class must be public as well as static. System.out.print("Base"); Bank General Knowledge - Online Test 5 An interface can extend many interfaces. An interface can extend another interface and a class can extend another class. So, finally the Color of the object is changed to red. The namespaces in C# can be nested. You cannot override the static method of the interface; you can just access them using the name of the interface. public C1(){ However, a class can only extend a single class. Which of the following statements is correct? Every PHP programmer knows you cant extend multiple classes with PHP.

A class can implement multiple interfaces. 4.Consider the two methods (within the same class)