Black Knight Technical Lead Interview Questions, Process, and Tips

Online aptitude test

10 questions, write in any programming language you know.

Find count of pairs whose sum is k in an array, with updated scenarios with each solution
hands on code for Java8, Springboot, HIbernate, Microservice architecture
Current project internals

Q1. Internal working of AWS services, deployment , monitoring, configuring alerts.
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Q1. Questions spring, design patterns.
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Q2. Tools used like jira, questions on agile scrum.
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Q1. Builder design pattern in java
Ans. 
Builder design pattern is a creational design pattern used to construct complex objects step by step.
• Builder pattern separates the construction of a complex object from its representation.

• It allows the same construction process to create different representations of the object.

• Useful when there are multiple ways to construct an object or when the object creation process is complex.

• Example: StringBuilder in Java allows ...read more
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Q2. Docker, MQ series involved
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Q3. JOIN Query with country , emp name
Ans. 
JOIN query to retrieve country and employee name
• Use JOIN keyword to combine data from multiple tables

• Specify the columns to select from each table

• Use ON keyword to specify the relationship between the tables
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Q1. Mix of coding, theory and design questions
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Q1. Joins, sql queries, unix commands
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Q1. Project description, pl sql concepts
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Q1. What are the Features of Java 8, and where you are using it in your current project?
Ans. 
Java 8 features include lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Functional interfaces enable the use of lambda expressions.

• Streams provide a way to work with collections of objects in a functional style.

• Default methods allow interfaces to have method implementations.

• Examples: Using lambda expressions to iterate...read more
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Q2. Map vs flat map, Function vs Predicate
Ans. 
Map applies a function to each element in a collection, while flatMap applies a function that returns a collection and flattens the result. Function is used to transform input into output, Predicate is used to test a condition.
• Map transforms each element in a collection using a function

• FlatMap transforms each element in a collection using a function that returns a collection and flattens the result

• Function is used to t...read more
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Q3. Find the sum of even numbers from a list using stream API
Ans. 
Use stream API to find sum of even numbers from a list
• Use filter to get only even numbers

• Use mapToInt to convert stream to IntStream

• Use sum() to get the sum of even numbers
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Q1. Design Principles and Explanation of Liskov's substitution principle.
Ans. 
Liskov's substitution principle states that objects of a superclass should be replaceable with objects of its subclasses without affecting the program's correctness.
• Subtypes must be substitutable for their base types

• Derived classes should be able to extend the functionality of base classes without changing their behavior

• Violating this principle can lead to unexpected behavior and errors in the program
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Q2. A case when switch-case will break any design principal.
Ans. 
Switch-case can break the Open/Closed Principle by requiring modification of existing code for new cases.
• Switch-case statements violate the Open/Closed Principle, which states that classes should be open for extension but closed for modification.

• Adding a new case to a switch statement requires modifying the existing code, violating the principle of not modifying existing code.

• Instead of using switch-case, consider usin...read more
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Q3. Different kinds of DB joins.
Ans. 
Different kinds of DB joins include inner join, outer join, left join, and right join.
• Inner join: Returns rows when there is at least one match in both tables.

• Outer join: Returns all rows when there is a match in one of the tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.
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Java 8 programming and features

Q1. Java 8 features
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Q2. Collection question
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