Your Corporate Life

February 4, 2023

Interview

Oops Concepts In Java With Realtime Examples

OOPS Concept In Java OOP (Object Oriented Programming) is a programming paradigm in which programs are organized around objects instead of actions and data rather than logic. It is a way of defining objects and classes that are used to represent real world objects. Java is an object-oriented language and supports OOP concepts such as inheritance, polymorphism, encapsulation, and abstraction. Inheritance: It is the mechanism by which one object can inherit the properties and behaviors of another object. In Java, inheritance is achieved through the use of the keyword “extends“. Here is an example of inheritance in Java: In this example, we have two classes: Animal and Dog. Dog extends Animal, meaning it inherits all the properties and methods of Animal. Additionally, Dog has its own property (breed) and method (bark()). When we create an instance of Dog, it has access to both the properties and methods of Animal and Dog. Inheritance in Java is a mechanism that allows a new class to inherit properties and behavior from an existing class. This concept is similar to a parent-child relationship, where the parent class (super class) passes down its properties to the child class (subclass). For example, consider a real-life scenario of a car. A car is a general category and can have several subclasses such as a sports car, sedan, or SUV. Each of these subclasses inherits properties such as wheels, engine, and doors from the car class, but they also have unique properties specific to their class. Similarly, in Java, the car class can have properties such as numberOfWheels, engineSize, and numberOfDoors, which are inherited by the subclasses of sports car, sedan, and SUV. The subclasses can also have their own unique properties, such as topSpeed for the sports car and seatingCapacity for the sedan. In summary, inheritance in Java allows for reusability of code and makes it easier to maintain and update code as the properties and behaviors of the parent class can be easily passed down to the child class. Polymorphism: It is the ability of an object to take on many forms. Polymorphism in Java is achieved through method overloading and method overriding. Here is an example of polymorphism in Java: The output will be: In this example, the class Animal has a method makeSound(). The classes Dog and Cat extend the Animal class and each have their own implementation of the makeSound() method. This allows us to create objects of type Animal, Dog, and Cat and call the makeSound() method on each, but still get different outputs, as the method is being overridden in the subclasses. This is polymorphism. An example of polymorphism in real life is the use of USB ports. USB ports are used to connect various devices such as flash drives, printers, smartphones, and many more. All these devices use the same USB port, but perform different functions. The USB port is a form of polymorphism because it can recognize and interact with different devices in the same way, even though each device has its own unique set of functions and capabilities. This allows for versatility and ease of use in connecting various devices to a computer or other device. Encapsulation: It is the process of hiding the implementation details of a class from the rest of the world. In Java, encapsulation is achieved by using access modifiers such as private and protected. Here is an example of encapsulation in Java: In the above example, the class Employee has four instance variables id, name, department, and salary which are defined as private. This means that these variables can only be accessed within the class itself. To access these variables from outside the class, getter and setter methods are used. Getters are used to retrieve the values of instance variables and setters are used to set the values of instance variables. This way, the internal representation of the object is hidden from the outside world, providing data protection and making it easier to maintain the code. Encapsulation can be seen in real life in the design of a car engine. The engine is made up of several parts such as the fuel injectors, spark plugs, pistons, and valves that all work together to create movement and power. Each part is encapsulated or enclosed within the engine, ensuring that it works properly and does not interfere with other parts. This also makes it easier to maintain and repair the engine, as each part can be replaced or fixed without affecting the rest of the engine. The encapsulation of the engine parts protects the overall functionality of the car and ensures its smooth operation. Abstraction: It is the ability of an object to hide its complexity and present a simple interface to the rest of the world. In Java, abstraction is achieved through the use of abstract classes and interfaces. Abstraction in Java refers to hiding the implementation details of a class and showing only the essential information to the users. Here’s an example: Output: In this example, the Shape class is an abstract class that defines two methods – an abstract method draw() and a non-abstract method fillColor(). The Circle and Rectangle classes extend the Shape class and implement the abstract method draw(). The user can use the draw() and fillColor() methods of the Circle and Rectangle classes without knowing the implementation details. An example of abstraction in real life is a computer mouse. A mouse is an abstraction of a human hand as it allows users to control their computer by clicking and dragging. The mouse does not represent the entire hand, but rather abstracts the functions of pointing and clicking into a small device that can be used to control a computer. Another example is a smartphone, which abstracts a variety of different devices and functions into one compact device.

Interview

What Is Constructor In Java

A constructor in Java is a special type of method that is used to initialize an object when it is created. It is automatically called when a new instance of the class is created and has the same name as the class. For example, consider a class named “Person” with two fields “name” and “age”: To create a new instance of the class, we use the following code: When this code is executed, the constructor Person(String name, int age) is automatically called and the fields name and age are initialized with the values “John Doe” and 30, respectively. Constructor Parameters Constructor parameters are the variables or arguments passed to a constructor method in a class. These parameters are used to initialize the object’s properties or fields when it is created. For example, consider the following class: In this example, the constructor Person takes two parameters: name and age. These parameters are used to initialize the object’s properties name and age when a new Person object is created. How To Prepare For Manual Testing Interview

Manual Testing Jobs In Pune
Jobs, Pune, Software Test Engineer

Automation Testing Jobs In Pune

QA Specialist Description ESSENTIAL RESPONSIBILITIES Working as part of the QA team, under the direction of the Quality Assurance Manager and team leads, the successful candidate will work with a small team of software development professionals and interns to fulfill the QA team’s responsibilities. KNOWLEDGE & SKILL • Assisting in monitoring an automated build and test environment, helping to track down the cause of failed tests.• Developing, maintaining and enhancing a suite of tests, including unit, FIT, performance, and multi-user tests.• Planning, executing and reporting on appropriate manual testing.• Converting manual tests to integration tests.• Reviewing unit test coverage and reporting on inadequate or inappropriate test coverage.• Contributing to improving our development process.• Working with other development teams, understanding the needs of the reservoir and production engineers who will be using our products, and helping develop clear specifications for new software features and acceptance tests/criteria for releases.• Maintaining effective communication between the development team and the QA team.• Working with project teams to develop use cases and draft manual tests early, to encourage a test-driven development process.• Entering found issues and defects into an issue tracking system. EDUCATION AND EXPERIENCE • A Bachelor’s degree in Engineering or related discipline• 3+ Years of experience in Software QA• Knowledge of testing methodologies and testing tools• Experience testing multi-tier architectures• Team focused with a positive attitude, must be self-motivated, and have very good time management and communication skills both in written and verbal English DESIRED QUALIFICATIONS • Programming experience with C#/C+ +/Java• Experience in commercial Oil & Gas industry engineering software is highly desired.• Cross platform (Windows and Linux) development or testing experience. Position: QA Testers Computer Modelling Group Ltd. develops innovative, easy-to-use reservoir simulation software. CMG’s software empowers customers to maximize hydrocarbon recovery by applying the most profitable production processes. CMG wants to exceed customer expectations by remaining focused on reservoir simulation. CMG is widely recognized as the market-leading developer and supplier of advanced reservoir simulation tools. CMG reinvests 20% of its annual revenue back into R&D, which furthers innovation and drives advanced recovery reservoir and production systems modelling technology. Manual Testing Jobs In India

Let's chat on WhatsApp

How can I help you? :)

03:28