30+ Planys Technologies Interview Questions and Answers

Java uses call by value.

• Java passes a copy of the value of a variable to a method, not the actual variable itself.

• Changes made to the parameter inside the method have no effect on the original variable.

• However, if the parameter is an object reference, the reference is passed by value, so changes to the object itself will be reflected outside the method.

Java is platform-independent due to its bytecode and virtual machine architecture.

• Java code is compiled into bytecode, which can run on any platform with a Java Virtual Machine (JVM).

• JVM acts as an interpreter, translating bytecode into machine code specific to the platform it is running on.

• This allows Java programs to be written once and run on any platform with a JVM installed.

• For example, a Java program written on a Windows machine can run on a Linux machine without any mo...read more

No, instances of abstract class cannot be created.

• Abstract classes are incomplete and cannot be instantiated.

• They are meant to be extended by subclasses that provide concrete implementations.

• Abstract classes can have abstract methods that must be implemented by the subclass.

• Example: abstract class Animal cannot be instantiated, but subclasses like Dog and Cat can be.

Swapping numbers can be done using a temporary variable, arithmetic operations, or XOR bitwise operator.

• Using a temporary variable: temp = a; a = b; b = temp;

• Using arithmetic operations: a = a + b; b = a - b; a = a - b;

• Using XOR bitwise operator: a = a ^ b; b = a ^ b; a = a ^ b;

Overloading is using the same method name with different parameters. Overriding is replacing a method in a subclass.

• Overloading is used to have multiple methods with the same name but different parameters.

• Overriding is used to replace a method in a subclass with a new implementation.

• Overloading is resolved at compile-time while overriding is resolved at runtime.

• Example of overloading: public void print(int num) and public void print(String str)

• Example of overriding: public cl...read more

Inheritance is a mechanism where a new class is derived from an existing class. Polymorphism is the ability of an object to take on many forms.

• Inheritance allows for code reuse and promotes a hierarchical organization of code.

• Polymorphism allows for flexibility in code design and enables objects to be used in multiple contexts.

• Example of inheritance: A class 'Car' can be inherited by a class 'SUV' which adds additional features specific to SUVs.

• Example of polymorphism: A clas...read more

The first line in coding is typically the declaration of the programming language being used.

• The first line is also known as the 'shebang' or 'hashbang' line.

• It specifies the interpreter or compiler to be used for the code.

• For example, in Python, the first line would be '#!/usr/bin/env python'.

Java doesn't support pointers for safety and security reasons.

• Java uses references instead of pointers to avoid memory leaks and null pointer exceptions.

• Pointers can be used to access memory directly, which can be a security risk.

• Java's garbage collector manages memory automatically, making pointers unnecessary.

• Java's design philosophy prioritizes safety and security over low-level control.

• Pointers can also make code more difficult to read and maintain.

I am currently working on Python.

• I have experience in developing automation scripts using Python.

• I have also worked on building web applications using Django framework.

• I am familiar with data analysis and visualization using Python libraries like Pandas and Matplotlib.

Yes, I have experience with MS Excel and MS PowerPoint.

• Proficient in creating and managing spreadsheets in MS Excel

• Skilled in using formulas, functions, and data analysis tools in Excel

• Experienced in creating professional presentations in MS PowerPoint

• Knowledgeable in using slide layouts, animations, and transitions

• Familiar with creating charts, graphs, and visual representations of data

The #include stdio.h is a preprocessor directive that includes the standard input/output library in C programming language.

• stdio.h stands for standard input/output header file.

• It contains functions like printf() and scanf() for input/output operations.

• It is included at the beginning of a C program using #include directive.

• It allows the program to use the standard input/output functions without having to write them from scratch.

• Example: #include int main() { printf("Hello, Wo...read more

Being innovative means introducing new ideas, methods, or products that bring about positive change and improvement.

• Innovation involves thinking creatively and outside the box.

• It is about finding new solutions to problems or improving existing ones.

• Innovation can be seen in the development of new technologies, processes, or business models.

• It often involves taking risks and embracing change.

• Examples of innovation include the invention of the smartphone, the introduction of on...read more

Java is a programming language used for developing applications. DBMS is a software used for managing databases. SQL is a language used for managing data in DBMS.

• Java is an object-oriented language used for developing desktop, web, and mobile applications.

• DBMS is a software used for creating, managing, and manipulating databases.

• SQL is a language used for querying and manipulating data in DBMS.

• Java can be used to connect to DBMS and perform operations on databases using SQL.

• P...read more

I don't have my identity card with me at the moment.

• I apologize for not having my identity card with me.

• I can provide a copy of my identity card at a later time.

• I can provide other forms of identification if needed.

C is considered the mother of all other languages due to its influence on modern programming languages.

• C was developed in the 1970s and was the first high-level programming language to be widely used.

• Many modern programming languages, such as Java, Python, and C++, were influenced by C.

• C is known for its efficiency, portability, and low-level memory manipulation capabilities.

• C is still widely used today in operating systems, embedded systems, and other applications.

• C's influe...read more

Fundamental rights are basic human rights that are essential for the development and well-being of individuals.

• Fundamental rights are enshrined in the constitution of a country

• They include rights such as freedom of speech, religion, and assembly

• They also include the right to life, liberty, and security of person

• Examples of fundamental rights include the First Amendment in the US Constitution and the Universal Declaration of Human Rights

• Violation of fundamental rights can lead...read more

JVM stands for Java Virtual Machine. It is an abstract machine that enables a computer to run Java programs.

• JVM is responsible for interpreting the compiled Java code and executing it on the computer.

• It provides a platform-independent environment for Java programs to run on different operating systems.

• JVM has various components like class loader, bytecode verifier, interpreter, and just-in-time compiler.

• Class loader loads the Java class files into the memory, bytecode verifie...read more

Python is more convenient due to its simplicity, versatility, and vast community support.

• Python has a simple and easy-to-learn syntax, making it accessible to beginners.

• Python is versatile and can be used for a wide range of applications, from web development to data analysis.

• Python has a vast community of developers who contribute to its libraries and frameworks, making it easier to find solutions to problems.

• Python has a large number of libraries and frameworks that can be ...read more

C++ is an extension of C with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has better support for polymorphism and inheritance.

• C++ has a standard template library (STL) while C does not.

• C++ allows function overloading while C does not.

• C++ has exception handling while C does not.

There are two types of modifiers: adjectives and adverbs.

• Adjectives modify nouns or pronouns, e.g. 'red apple', 'happy child'.

• Adverbs modify verbs, adjectives, or other adverbs, e.g. 'quickly ran', 'very happy', 'extremely slowly'.

C++ is an extension of C with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has better support for polymorphism and inheritance.

• C++ has a standard template library (STL) for data structures and algorithms.

• C++ allows function overloading while C does not.

• C++ has exception handling while C does not.

Public and protected are access modifiers in object-oriented programming.

• Public allows unrestricted access to a class member from any part of the program.

• Protected allows access to a class member within the class and its subclasses.

• Public members are accessible outside the class, while protected members are not.

• Public members can be accessed by any object, while protected members can only be accessed by the class and its subclasses.

• Public members are used for methods that nee...read more

Software development cycle is a process of designing, developing, testing, and deploying software.

• It involves planning and analysis of requirements

• Designing the software architecture and user interface

• Coding and implementation of the software

• Testing and debugging to ensure quality

• Deployment and maintenance of the software

• Examples include Agile, Waterfall, and DevOps methodologies

Method overloading is a feature in object-oriented programming where a class can have multiple methods with the same name but different parameters.

• Method overloading allows for more flexibility in programming by allowing methods with the same name to perform different tasks based on the parameters passed to them.

• The methods must have different parameter lists, which can differ in the number, type, or order of parameters.

• For example, a class may have two methods named 'calcula...read more

OOPs concepts are the fundamental principles of Object-Oriented Programming.

• Abstraction

• Encapsulation

• Inheritance

• Polymorphism

• Classes and Objects

• Methods and Properties

• Message Passing

• Dynamic Binding

Normalization is the process of organizing data in a database to reduce redundancy and dependency.

• Normalization helps in improving data consistency and accuracy.

• It involves breaking down a table into smaller tables and defining relationships between them.

• Normalization is achieved through a series of normal forms, such as first normal form (1NF), second normal form (2NF), and so on.

• Normalization can help in reducing data anomalies and improving database performance.

• Example: A ...read more

DBMS is a software system to manage databases while RDBMS is a type of DBMS that stores data in tables with relations.

• DBMS stands for Database Management System while RDBMS stands for Relational Database Management System.

• DBMS can manage any type of database while RDBMS is specifically designed to manage relational databases.

• DBMS does not enforce any specific data model while RDBMS enforces the relational data model.

• DBMS does not support ACID properties while RDBMS supports A...read more

A database is a structured collection of data that is organized in a way that allows for easy access, management, and retrieval.

• Database stores data in tables, with each table consisting of rows and columns.

• It allows for efficient querying and retrieval of specific data.

• Examples of databases include MySQL, Oracle, and MongoDB.

Joins are used in databases to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column between them

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

I'm sorry, but I don't understand the question. Could you please rephrase it?

• Please provide more context or clarify the question.

• Without additional information, I am unable to provide a relevant answer.

• Could you please repeat the question or provide more details?