Lauren Information Technologies Interview Questions and Answers

You will be required to complete a machine test.

They will interrogate you about your resume.

Q1. The HR will discuss the salary with you.
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Print a specific pattern using any programming language.

Q1. What is a class in Object-Oriented Programming (OOP)?
Ans. 
A class in OOP is a blueprint for creating objects, defining their properties and behaviors.
• Classes are templates for creating objects in OOP

• They define the properties (attributes) and behaviors (methods) of objects

• Objects are instances of classes, each with its own unique data

• Inheritance allows classes to inherit properties and behaviors from other classes

• Encapsulation ensures that the data is hidden and can only be a...read more
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Q2. What is the difference between an abstract class and an interface?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

• A class can only extend one abstract class, but can implement multiple interfaces.

• Abstract classes are used to define common characteristics of subclasses, while interfaces are used to define contracts for...read more
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Q3. What is joining and creating an inner join query?
Ans. 
Joining is combining data from two or more tables based on a related column, while an inner join query retrieves only the matching records.
• Joining is used to combine data from multiple tables in a database.

• Inner join query retrieves only the records that have matching values in both tables.

• Syntax for inner join: SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;

• Example: SELECT orders.order_i...read more
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Q1. What is runtime polymorphism, and can you provide a code example to illustrate it?
Ans. 
Runtime polymorphism allows a subclass to provide a specific implementation of a method that is already provided by its parent class.
• Runtime polymorphism is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass.

• The method to be overridden must have the same name, return type, and parameters in both the superclass and subclass.

• When an o...read more
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Q2. Streams in java
Ans. 
Streams in Java provide a way to process collections of objects in a functional style.
• Streams are sequences of elements that support various operations like filter, map, reduce, etc.

• They can be created from collections, arrays, or generate elements dynamically.

• Streams can be sequential or parallel, allowing for efficient processing of large datasets.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Cha...read more
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Q3. How do we create threads in Java, and how do we invoke them?
Ans. 
Threads in Java are created by extending the Thread class or implementing the Runnable interface, and invoked using the start() method.
• Threads can be created by extending the Thread class and overriding the run() method.

• Threads can also be created by implementing the Runnable interface and passing an instance of the class to a Thread object.

• Threads are invoked by calling the start() method on the Thread object.
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Q4. What is a Rest Template and how is it used?
Ans. 
Rest Template is a class in Spring that simplifies making HTTP requests and handling responses.
• Rest Template is part of the Spring framework in Java.

• It can be used to make HTTP requests to RESTful web services.

• It simplifies the process of making HTTP calls and handling responses.

• Rest Template can handle GET, POST, PUT, DELETE, etc. requests.

• Example: RestTemplate restTemplate = new RestTemplate();
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