Coding test regarding the tools and technologies

Q1. Asked about the connections
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Q2. Questions on coding
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Q1. Define SOLID principles
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SOLID principles are a set of five design principles for writing maintainable and scalable code.
• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: Classes should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correct...read more
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Q2. How is data binding achieved in WPF. Show with an example
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Data binding in WPF allows synchronization of data between UI elements and data sources
• Data binding in WPF can be achieved using the Binding markup extension

• Properties of UI elements can be bound to properties of data objects

• Example: binds the Text property of TextBlock to the Name property of data object
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There was Aptitude, Technical and Coding. Coding there were 4 sections for 4 languages (C, C++, java, Python) We had to do atleast 2. Technical MCQs were based on OS, CN, DSA, C, C++, Python (Numpy, Panda) and Java

Q1. Mainly asked OS, and since I'm from EEE dept, i wasnt well versed in CN, so no CN questions were asked to me. My primary coding language was Python, so some questions regarding the python was asked. I was ...read more
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Q1. Please give an introduction of yourself.
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Q2. Your comfortable programming/coding language
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Q3. What is session in java?
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Session in Java is a way to store information about a user across multiple requests.
• Session is used to maintain stateful information about a user.

• It is created when a user first accesses a web application and remains active until the user logs out or the session times out.

• Session data is stored on the server and can be accessed by multiple requests from the same user.

• It is commonly used for user authentication, shoppin...read more
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Q4. What is Java Class Library?
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Java Class Library is a collection of pre-compiled classes and methods that provide ready-to-use functionality for Java developers.
• Java Class Library contains classes for common tasks like input/output, networking, database access, etc.

• Developers can use these classes to save time and effort by reusing existing code.

• Examples include java.lang, java.util, java.io, java.net, etc.
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Q5. Types of datatypes in Java
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Java has several types of datatypes including primitive and reference types.
• Primitive datatypes include int, double, boolean, char, etc.

• Reference datatypes include classes, interfaces, arrays, etc.

• Examples: int age = 25; String name = "John"; int[] numbers = {1, 2, 3};

• Wrapper classes like Integer, Double, Boolean, etc. are used to wrap primitive types.
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Q6. One question was on SQL. (I had mentioned SQL in one of my academic projects)
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Q7. Please tell me What is HTML?
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HTML stands for HyperText Markup Language. It is the standard markup language for creating web pages.
• HTML is used to structure content on the web.

• It uses tags to define elements such as headings, paragraphs, links, images, etc.

• HTML documents are interpreted by web browsers to display the content.

• Example:

  This is a heading
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Q8. How to change a div background colour?
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To change a div background color in Java, use the setBackground() method and pass the desired color as a parameter.
• Create a reference to the div element using its id or class

• Use the setBackground() method to set the background color

• Pass the desired color as a parameter to the setBackground() method
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Q1. What is checked unchecked exceptions?
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Checked exceptions are exceptions that must be declared in a method's signature or handled using try-catch blocks.
• Checked exceptions are checked at compile-time.

• They are typically used for exceptional conditions that can be reasonably recovered from.

• Examples of checked exceptions in Java include IOException, SQLException, and ClassNotFoundException.
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Q2. How to remove duplicated form from array list?
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To remove duplicates from an ArrayList of strings, use a HashSet to store unique elements.
• Create a HashSet and add all elements from the ArrayList to it.

• Create a new ArrayList and add all elements from the HashSet to it.

• The new ArrayList will contain only unique elements.
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Q3. How hashset and hashmap work internally?
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HashSet and HashMap are both data structures in Java that use hashing to store and retrieve elements.
• HashSet uses HashMap internally to store its elements as keys with a dummy value.

• HashMap uses an array of linked lists called buckets to store key-value pairs.

• Both HashSet and HashMap use the hashCode() method to calculate the hash value of keys.

• HashSet uses the hash value to determine the bucket where an element should...read more
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Q4. Find sum of all odd numbers in a list using stream?
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Using Java stream, find the sum of all odd numbers in a list.
• Use the filter() method to filter out the odd numbers from the list.

• Use the mapToInt() method to convert the filtered numbers to integers.

• Use the sum() method to calculate the sum of the filtered odd numbers.
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Q1. Basics of java were asked
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Q1. Advanced design concepts and sql
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Q1. Salary negotiations behaviour round screening
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Q1. Some Basic Question from your technologies
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Q1. Some technical question and coding test. basic palindrom, and some basic algo question
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Q1. Salary discussion only
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