Accion Labs Interview Questions, Process, and Tips

Q1. Diff between Interface and Abstract Class ?
Ans. 
Interface is a contract that defines the methods a class must implement, while abstract class can have both implemented and abstract methods.
• Interface can only have abstract methods and constants, while abstract class can have abstract and non-abstract methods.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to achieve multiple inheritance in Java, while abstrac...read more
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Q2. Can we have static methos in Interface and Abstract clss
Ans. 
Yes, static methods can be defined in interfaces but not in abstract classes.
• Static methods in interfaces are used for providing utility methods that can be accessed without creating an instance of the interface.

• Static methods in abstract classes are not allowed as abstract classes are meant to be extended and implemented by subclasses.

• Example: interface MyInterface { static void myMethod() { System.out.println("Static
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Q3. Difference between Hashmap and LinkedHashmap
Ans. 
HashMap is unordered and unsorted, while LinkedHashMap maintains insertion order.
• HashMap does not maintain insertion order, while LinkedHashMap maintains insertion order.

• HashMap allows one null key and multiple null values, while LinkedHashMap allows one null key and multiple null values.

• HashMap is faster for iteration, while LinkedHashMap is slower due to maintaining order.
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Q4. Apply OOPS concept in your framework and explain
Ans. 
OOPS concepts like inheritance, encapsulation, and polymorphism can be applied in the framework design to improve code reusability and maintainability.
• Use inheritance to create a base class with common methods and properties that can be inherited by other classes.

• Encapsulate data and behavior within classes to protect data from being accessed directly.

• Implement polymorphism to allow objects of different classes to be t...read more
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Q1. What is your process for writing user stories?
Ans. 
I follow a collaborative approach involving stakeholders to write user stories.
• I conduct workshops with stakeholders to gather requirements and prioritize features.

• I use the INVEST criteria to ensure user stories are Independent, Negotiable, Valuable, Estimable, Small, and Testable.

• I include acceptance criteria to define the scope of each user story.

• I continuously refine and update user stories based on feedback and ch
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Q2. What is the flow of your current project?
Ans. 
The flow of the current project involves gathering requirements, prioritizing features, sprint planning, development, testing, and deployment.
• Gathering requirements from stakeholders

• Prioritizing features based on business value

• Sprint planning with development team

• Development of features

• Testing of features

• Deployment of completed features
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Q1. What steps would you take to design a warehouse as a product manager?
Ans. 
To design a warehouse as a product manager, I would first analyze the requirements, create a detailed plan, collaborate with stakeholders, and continuously iterate on the design.
• Analyze the requirements of the warehouse such as storage capacity, layout, automation needs, and safety regulations.

• Create a detailed plan outlining the design specifications, budget, timeline, and resources required.

• Collaborate with stakehold...read more
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Q1. What is MVC? Explain in detail.
Ans. 
MVC is a software design pattern that separates an application into three main components: Model, View, and Controller.
• Model represents the data and business logic of the application.

• View is responsible for displaying the data to the user.

• Controller acts as an intermediary between Model and View, handling user input and updating the Model accordingly.

• MVC helps in organizing code, improving maintainability, and promotin...read more
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Q2. What is difference between InnoDB and MyIsam?
Ans. 
InnoDB is a transaction-safe storage engine for MySQL, while MyISAM is not transaction-safe.
• InnoDB supports transactions with ACID properties, while MyISAM does not.

• InnoDB supports foreign keys, while MyISAM does not.

• InnoDB is more reliable and crash-safe compared to MyISAM.

• InnoDB is the default storage engine for MySQL 5.5 and higher versions.

• MyISAM is faster for read-heavy operations, while InnoDB is better for write
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Q1. What is difference between interface and abstract class
Ans. 
Interface defines only method signatures while abstract class can have both method signatures and implementations.
• Interface cannot have method implementations, only method signatures.

• Abstract class can have both method signatures and implementations.

• A class can implement multiple interfaces but can only inherit from one abstract class.

• Interfaces are used to define a contract for classes to implement, while abstract cla...read more
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Q2. What is a static method?
Ans. 
A static method is a method that belongs to the class itself, rather than to instances of the class.
• Static methods can be called directly on the class without needing to create an instance of the class.

• Static methods are commonly used for utility functions that do not require access to instance-specific data.

• Static methods are declared using the 'static' keyword in PHP.
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Q3. Explain the steps to optimize SQL query
Ans. 
Optimizing SQL queries involves analyzing query performance, indexing, minimizing data retrieval, and using appropriate joins.
• Analyze query performance using tools like EXPLAIN to identify bottlenecks

• Use indexes on columns frequently used in WHERE clauses

• Minimize data retrieval by selecting only necessary columns

• Avoid using SELECT * and instead specify required columns

• Use appropriate joins like INNER JOIN, LEFT JOIN, e
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Q1. What does the array_map in PHP used for?
Ans. 
array_map in PHP is used to apply a callback function to each element of an array.
• array_map() returns an array containing all the elements of the input array after applying the callback function to each one.

• It is useful for applying a function to all elements of an array without using a loop.

• Example: array_map('strtoupper', ['apple', 'banana', 'cherry']) will return ['APPLE', 'BANANA', 'CHERRY'].
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Q2. What is callback function in PHP?
Ans. 
A callback function in PHP is a function that is passed as an argument to another function and is executed at a later time.
• Callback functions are commonly used in PHP for event handling, asynchronous processing, and custom sorting.

• Example: array_map() function in PHP takes a callback function as an argument to apply a user-defined function to each element of an array.

• Another example: usort() function in PHP uses a call...read more
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Q3. Explain the workflow of PHPUnit
Ans. 
PHPUnit workflow involves writing test cases, running tests, and analyzing results.
• Write test cases using PHPUnit framework

• Run tests using PHPUnit command line interface or IDE integration

• Analyze test results to identify failures and errors

• Make necessary code changes to fix failing tests

• Repeat the process until all tests pass successfully
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Q1. Remove duplicates in SQL
Ans. 
Use DISTINCT keyword or GROUP BY clause to remove duplicates in SQL
• Use SELECT DISTINCT column_name FROM table_name to retrieve unique values

• Use GROUP BY column_name HAVING COUNT(*) = 1 to remove duplicates based on a specific column

• Consider using ROW_NUMBER() function with PARTITION BY clause to remove duplicates based on a specific order
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Q2. SCD type2 and filter
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Q1. AEM Architeture and Sling models
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Q2. AEM Templates static and editables
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SQL queries and Coding to write code of booking a ticket for train

Q1. Dot net core questions
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Q1. Salary discussion
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Q2. Project discussion
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Q1. What is your experience in tool
Ans. 
I have 3 years of experience working with UiPath and Automation Anywhere tools in developing RPA solutions.
• 3 years of experience with UiPath and Automation Anywhere tools

• Developed RPA solutions for automating repetitive tasks

• Experience in designing and implementing automation workflows

• Familiarity with debugging and troubleshooting RPA scripts
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