So you’ve finally landed your ideal job in Computer Science, but you’re not sure how to win Computer Science interview or what the likely Computer Science interview questions will be. Every Computer Science interview is unique, as is the breadth of the position. With this in mind, we’ve put up a list of the most popular Computer Science interview questions and answers to assist you in accomplishing your interview.
The following are the most often asked Computer Science interview questions:
Q1. What exactly is a file?
Ans: A file is a named location that permanently stores data or information. A file name is always used to store a file inside a storage device (e.g. STUDENT.MARKS). A “.” separates the primary and secondary names in a file name (DOT).
Q2. What exactly is a class?
Ans: A class is a blueprint for the creation of objects. A class contains methods and variables that are associated with a class instance.
Q3. What exactly is a constructor?
Ans: A constructor is a set of methods that are used to generate a class object. Default and parameterized constructors are the two types of constructors.
Q4. What is the OOPS principle?
Ans: The following are the basic OOPS principles:
Q5. What is polymorphism?
Ans: Polymorphism refers to an object’s ability to take on various forms. When a parent class reference is used to refer to a child class object, polymorphism is most typically utilized in OOP.
Q6. What is the definition of a singleton class?
Ans: The singleton class restricts the number of objects created for a class to one, but allows for the creation of more objects if the case requires it.
Q7. What are the many kinds of access modifiers?
Ans: The following are the four types of access modifiers:
- Can be seen as part of the full package. There is no need for a modifier.
- Private – Only the class can see it.
- Public – open to the whole public.
- Protected – Packages and subclass can see it.
Q8. Overloading vs. overriding: what’s the difference?
Ans: When two or more methods in the same class have the same name but distinct parameters, this is known as overloading (i.e different method signatures).
When two methods have the same method name and parameters (i.e., method signature), but one is in the parent class and the other is in the child class, this is known as overriding.
Q9. In Java, what are multiple inheritances?
Ans: Multiple inheritance is supported in Java, which means a class can implement multiple interfaces. Multiple Interfaces can be implemented by a class, but it cannot extend multiple classes.
Q10. What exactly is a stream?
Ans: A stream is a collection of data in a particular order. There are two different types of streams.
- Input Stream: This type of stream is used to read data from a source.
- Output Stream: This stream is used to write data to a specific location.
Q11. What is a Character Stream, and how does it work?
Ans: The Java Character Stream is mostly used for 16-bit Unicode input and output. The major classes that are used are FileReader and FileWriter, which use FileInputStream and FileOutputStream internally, respectively. The main difference is that FileReader and FileWriter read and write two nibbles at a time.
Q12. What is a byte stream, and how does it work?
Ans: The Java Byte stream is mostly used for 8-bit Unicode input and output.
FileInputStream and FileOutputStream are the two most important byte stream classes.
Q13. What is the definition of an interface?
Ans: In Java, an interface is a reference type that is comparable to a class but contains abstract methods. Multiple interfaces can be implemented by a single class.
Q14. What is the difference between a class and an interface?
Ans: The following are the distinctions between Interface and class:
- It is not possible to create the interface.
- There are no constructors in an interface.
- Only abstract methods are available in the interface.
- A class extends another class by implementing an interface.
- Multiple interfaces can be extended by a single interface.
Q15. What is the definition of an abstract class?
Ans: Abstract class is a class that has the abstract keyword in its declaration. The abstract class has the following properties:-
- Abstract classes may or may not have abstract methods, but they must be declared abstract if they have at least one abstract method.
- It is not possible to instantiate the abstract class.
- We must inherit an abstract class from another class in order to use it.
- We must supply implementations for all abstract methods of an abstract class if we inherit it.\
Q16. How well-versed are you on the internet and the World Wide Web?
Ans: The internet is a large network of networks, with numerous Wide Area Networks making up the network infrastructure. The World Wide Web, sometimes known as the web, is a method of obtaining information via the internet.
Q17. When it comes to data, information, and programs, what’s the difference?
Ans: Data is a collection of disorganized facts that must be processed in order to be useful. Information is a bundle of data that has been processed in a meaningful way in compliance with the given standards. A programs is a set of instructions for doing certain tasks on a computer.
Q18. What’s the difference between interpreters and compilers?
Ans: The compiler translates all of the programs into object code, which is often saved in files. After connecting, the machine can run the object code immediately. The interpreter does not transform line-by-line instructions written in a programming language into object code or machine code before executing them.
Q19. What is the difference between procedural and object-oriented programming?
Ans: The procedure is the main module in procedural programming. Assignments, tests, repeats, and calls for sub-processes are examples of imperative statements used in these procedures. This is a function that converts parameters into return statements.
The primary module of an object-oriented programs is a class, not a procedure. You can design classes and objects that model real-world objects using the object-oriented method.
Q20. What do you know about software testing skills?
Ans: The process of executing an application with the goal of detecting software faults is known as software testing. It’s also known as the process of validating and ensuring that a software program works properly. Alpha testing, beta testing, and other types of software testing exist.
Q21. What is a framework, exactly?
Ans: The framework is a software development platform that serves as the foundation for software developers to create program for a specific platform. A framework, for example, could have predefined classes and functions for processing inputs, managing hardware devices, and interacting with system software.
Q22. What is cryptography and how does it work?
Ans: Cryptography is the use of code to safeguard actual information and communication such that only those who are given access to it may read and process it.
Q23. What’s the difference between application software and system software?
Ans: System software is software that controls and communicates with the hardware of a computer. This serves as a platform for the execution of application software. Application software is specialized software that allows users to complete certain activities.
Q24. What is the difference between primary and secondary memory?
Ans: Primary memory (RAM) is the computer’s main memory that can be accessed directly by the CPU. Until the process is finished, primary memory stores temporary data. External storage devices that can be utilized to store data or information permanently are referred to as secondary memory (File Storage Device).
Q25. How do 32-bit and 64-bit processors differ?
Ans: The 32-bit system may access a total of 2 32 memory addresses, or 4 GB of RAM. The 64-bit system has access to 2 64 memory addresses, which equates to 18 billion bytes of RAM. A 64-bit CPU is capable of handling memory sizes greater than 4 GB.