The elements of OOP will be explained in details and demonstrated in various parts of this tutorial. An object is a single instance of a class; it is created by invoking the constructors of the class.
Class exists in source temporal scope and objects exist in run-time temporal scope. In computing, abstraction means separating concepts from details through a hierarchy of layers. The design makes the interface of the data and operations accessible but hides the actual implementation of them. The internal representation and implementation of an object is hidden from users. This concept encompasses: data abstraction, process abstraction and encapsulation.
We can add another service function that prints the data members x and y to the stdout as follows:. They all refer to the same thing, the means of modeling how the object can operate and behave. While data members model states and attributes, functions model actions, operations and behaviors. It is typically kept in a separate file apart from class specification. An instance of a class is created at runtime using one the available constructors. Only when you instantiate an object, then you can use it and communicate with it.
The general characteristics of them include:. See the question on shallow copy Q A destructor is a special function member of a class designed to execute the required code when the object is about to be destroyed. One important task under destructors is the dynamic memory de-allocation. Se Q10 for a general example. See Q In classes, the overloaded constructor is an example where you can have many constructors with different parameter list signatures.
A Bat is both a mammal and a bird therefore, it inherits attributes and behaviors form both parents. It is a mechanism in OOP that facilitates the utilization of previously created code; its main advantages include: time saving, better resource utilization and reducing redundancy.
60 Java Multiple Choice Questions And Answers 2020
One good example of code reuse is inheritance. In OOP inheritance implies extension where, there is no point of just inheriting the same content of the base class and not adding any data or function members, if that is the case then, the base class by itself could be used directly and no need for inheritance. As for the user defined data types UDTthe designer of these classes must provide specific implementation of all required operators that can operate on a particular UDT.
Without templates, the programmer needs to write a separate function for each data type. Exception handling is designed to separate the error handling code from the original code to gracefully handle the fault situation by transferring the program control to the exception handling code.
Many aspects of software development process can be improved such as: safety, readability, writeability, maintainability, etc. See the next example. So, a snake would be a reptile which is an animal which is a living being. The following table summarizes these different cases:.
If all members are statically defined no dynamic memory allocation then, the shallow copy is safe and effective otherwise, the pointers to dynamic memory in both objects will be aliases and will point to the same location which is undesirable since objects are typically independent. See Q72 - Q74 to see how they can be accessed.Q2: What is class? Ans: A class can be declared as a collection of data members along with members function which allows association of data and functions into a single unit called encapsulation.
Q4: Explain constructor? Q5: What is a function? Ans: A function is a block of code which executes the statements when we call it. It consists of three entities: 1 the function name. Q6: Explain Inline function? Ans: Inline function are those function whose function body is inserted in place of the function call. Q7: What is function overloading? Ans: function polymorphism for function overloading is a concept that allows multiple function to share the same name with different arguments type assigning one or more function function body to the same name is known as function overloading.
Q8: What is implicit and explicit type conversion? Explicit: the conversion of data type of two operands is not automatic but forced. Ans: it is a technique of organizing information in a hierarchy form. It is like a child inheriting the features of its parent.
The class which we are inheriting from is called as the base class and the class which inherits called as derived class.
Different types of inheritance are as follows-: 1 single level 2 Multi-level 3 Multiple 4 Hierarchical hybrid 5 multipath. Q What is friend function?
Object Oriented Programming - Basics of C++
Ans: A friend function is a function which is use to access the private data member of different class. A fun action getCurrentBalance which returns value of cashOnHand. Hie, my name is hamza khan and i am from New Delhi.
I am doing bca from ignou. What are all the important questions in microprocessor and tell me how I m studying it in easy way? Many students in the Nilgiris are in need of these question papers. Write a program that reads 3 integer numbers a,b and c from user and computes minimum,median and maximum of the numbers.
I am pursing bca 3th sem in ch. I am not understanding. If i declares display function as a friend function then there is no problem in programming while if i declare get function for friend function and display function as member function then how can i solve the problem in programming.
It is an object oriented programming language. The given article is very essential for those who are preparing for interviews as well as for their semester exams. For any technical interview concept of OOP is very much important. Go through the above questions,they will enrich your understanding in this subject. Though just these questions do not satisfy the needs for facing an interview based on C but it will be quite ensuring if someone is searching for the basic grip on C.
This question are so basic. N most helpful is realtime example on it topics. So evry1 sholud go through it specially who r interested in IT field. In This topic include 10 basics ques. About the Author: Puja Agarwal. Comment Name Email Website. Anonymous says:.You all must have this kind of questions in your mind. Below article will solve this puzzle of yours. Just take a look. Thank you for visiting my thread.
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Today Updates.Here Coding compiler sharing a list of 60 core java and advanced java multiple choice questions and answers for freshers and experienced. These java multiple choice interview questions asked in various java interview exams.
All the best for your future and happy java learning. After the above piece of code is executed, what are the colors of r1 and r2 in this order? The method setValue assigns the value of i to the instance field value. What could you write for the implementation of setValue? Java Multiple Choice Questions 23 You read the following statement in a Java program that compiles and executes.
Java Multiple Choice Questions 24 The java run time system automatically calls this method while garbage collection. Java Multiple Choice Questions 29 All exception types are subclasses of the built-in class. Java Multiple Choice Questions 30 When an overridden method is called from within a subclass, it will always refer to the version of that method defined by the.
Java Multiple Choice Questions 31 Mark the incorrect statement from the following:. Java Multiple Choice Questions 34 Identify, from among the following, the incorrect variable name s. Java Multiple Choice Questions 35 Use the following declaration and initialization to evaluate the Java expressions. Java Multiple Choice Questions 36 Use the following declaration and initialization to evaluate the Java expressions.
Java Multiple Choice Questions 37 Use the following declaration and initialization to evaluate the Java expressions. Java Multiple Choice Questions 38 Use the following declaration and initialization to evaluate the Java expressions. Members of a class specified as ……………….
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Packages provide a visibility control mechanism. One of the important properties of a package is that all classes defined inside a package is accessible by code outside that package. Which of them is correct? A class can be declared as both abstract and final. A class declared as final can be extended by defining a sub-class. Resolving calls to methods dynamically at run-time is called late binding. The class Object defined by Java need not be a super class of all other classes.
All white-space characters blanks are ignored by the compiler. Java keywords can be used as variable names. An identifier does not begin with a digit and does not contain any spaces. The execution of Java applications begins at method main. Wow, this was cool. Keep writing this kind of texts, you will get a lot of people to this blog if you continue working on this. Question No. Sign in. Log into your account. Password recovery.
Thursday, April 16, Forgot your password? Get help. Interview Questions Java Interview Questions. Share on Facebook.Following are frequently asked Interview Questions for freshers as well as an experienced. OOPS is abbreviated as Object Oriented Programming system in which programs are considered as a collection of objects. Each object is nothing but an instance of a class. A class is simply a representation of a type of object. Encapsulation is an attribute of an object, and it contains all data which is hidden.
That hidden data can be restricted to the members of that class. Polymorphism is nothing but assigning behavior or value in a subclass to something that was already declared in the main class. Simply, polymorphism takes more than one form. Inheritance is a concept where one class shares the structure and behavior defined in another class. If Inheritance applied to one class is called Single Inheritance, and if it depends on multiple classes, then it is called multiple Inheritance.
Examples are endl and setw. A constructor is a method used to initialize the state of an object, and it gets invoked at the time of object creation. Rules for constructor are:. A destructor is a method which is automatically called when the object is made of scope or destroyed. Destructor name is also same as class name but with the tilde symbol before the name. An inline function is a technique used by the compilers and instructs to insert complete body of the function wherever that function is used in the program source code.
A virtual function is a member function of a class, and its functionality can be overridden in its derived class. This function can be implemented by using a keyword called virtual, and it can be given during function declaration. A friend function is a friend of a class that is allowed to access to Public, private, or protected data in that same class.
If the function is defined outside the class cannot access such information. A friend can be declared anywhere in the class declaration, and it cannot be affected by access control keywords like private, public, or protected.
Function overloading is a regular function, but it can perform different tasks. It allows the creation of several methods with the same name which differ from each other by the type of input and output of the function. Operator overloading is a function where different operators are applied and depends on the arguments.
An abstract class is a class which cannot be instantiated. Creation of an object is not possible with an abstract class, but it can be inherited. An abstract class can contain only an Abstract method. Java allows only abstract method in abstract class while other languages allow non-abstract method as well.
The ternary operator is said to be an operator which takes three arguments. Arguments and results are of different data types, and it depends on the function.Object-oriented Programming in 7 minutes - Mosh
The ternary operator is also called a conditional operator. Finalize method helps to perform cleanup operations on the resources which are not currently used. Finalize method is protected, and it is accessible only through this class or by a derived class. A parameter is a variable used during the declaration of the function or subroutine, and arguments are passed to the function body, and it should match with the parameter defined.
There are two types of Arguments. The super keyword is used to invoke the overridden method, which overrides one of its superclass methods. This keyword allows to access overridden methods and also to access hidden members of the superclass. Method overriding is a feature that allows a subclass to provide the implementation of a method that overrides in the main class. It will override the implementation in the superclass by providing the same method name, same parameter, and same return type.You all must have this kind of questions in your mind.
Below article will solve this puzzle of yours. Just take a look. Thank you for visiting my thread. Hope this post is helpful to you. Kindly share this post with your friends to make this exclusive release more useful. Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email.
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Leave this field empty. Trending Today. Load more. Get New Updates Email Alerts Enter your email address to subscribe this blog and receive notifications of new posts by email.Dear Readers, Welcome to Oops Interview questions with answers and explanation. These 36 solved Oops questions will help you prepare for technical interviews and online selection tests conducted during campus placement for freshers and job interviews for professionals.
After reading these tricky Oops questionsyou can easily attempt the objective type and multiple choice type questions on this Oops. What are the basic concepts of OOP? The four basic concepts of OOP are: a. Abstraction b. Polymorphism c. Inheritance d. What is dynamic or run time polymorphism?
Here, there can be two methods with same name and signature but different implementation. What is Encapsulation? Differentiate between abstraction and encapsulation. What is Inheritance? Explain method overriding. Can you give some examples of tokens?
What is friend function? Define Modularity? Explain: a. Colloboration a. Colloboration - Process by which several objects co-operate to deliver a higher level result. What is a ternary operator? What are sealed modifiers? Static binding b.
Dynamic binding a. Static binding- It is a binding in which the name of the class can be associated with it during compilation. Also referred to as early binding. Dynamic binding — It is a binding in which the name of the class can be associated with it during execution time. Also referred to as late binding.