Deloitte Engineer 1 Interview Questions and Answers

Q1. Difference between inheritance and polymorphism
Ans. 
Inheritance is a way to create a new class using properties and methods of an existing class, while polymorphism allows objects of different classes to be treated as objects of a common superclass.
• Inheritance allows a class to inherit properties and methods from another class.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Inheritance promotes code reusability and reduce...read more
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Q2. Write a code to check anagram or not
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Code to check if two strings are anagrams
• Create a function that takes in two strings as input

• Convert both strings to lowercase and remove any spaces

• Sort both strings and compare if they are equal to determine if they are anagrams
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Q1. Find the duplicates using hashmap
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Use hashmap to find duplicates in an array of strings
• Create a hashmap to store each string as key and count as value

• Iterate through the array and check if the string already exists in the hashmap

• If it does, increment the count, else add it to the hashmap

• Return the strings with count greater than 1 as duplicates
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Q2. Implement Singleton design pattern
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Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Create a private static instance variable in the class.

• Provide a public static method to access the instance.

• Ensure the constructor is private to prevent instantiation from outside the class.
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Q1. What is transient and volatile keyword
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transient and volatile are keywords in Java used for different purposes
• transient keyword is used to indicate that a field should not be serialized when converting an object to byte stream

• volatile keyword is used to indicate that a variable's value will be modified by different threads

• transient keyword is used in serialization, while volatile keyword is used in multithreading

• example: transient keyword - private transien...read more
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Q2. Explain comparator and comparable
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Comparator and Comparable are interfaces in Java used for sorting objects.
• Comparator interface is used to define custom sorting logic for objects.

• Comparable interface is used to define natural ordering of objects.

• Comparator is used when you want to sort objects based on multiple attributes.

• Comparable is used when you want to sort objects based on a single attribute.

• Example: Sorting a list of Person objects based on the...read more
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Few basics of java
Dsa question

Q1. Java multithreading questions
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Q2. Spring boot questions.
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Q1. Tell me about yourself
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I am a dedicated and detail-oriented Junior Engineer with a passion for problem-solving and continuous learning.
• Graduated with a degree in Engineering from XYZ University

• Completed internships at ABC Company, gaining hands-on experience in project management

• Proficient in CAD software and technical drawing
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Q2. Diagram of water treatment
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Water treatment involves a series of processes to remove impurities and make water safe for consumption.
• Water treatment typically involves processes such as coagulation, sedimentation, filtration, and disinfection.

• Coagulation involves adding chemicals to water to make particles clump together for easier removal.

• Sedimentation allows the larger particles to settle at the bottom of a tank.

• Filtration involves passing water...read more
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Q1. Personal details
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Q2. Why you want to join
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I want to join because I am passionate about engineering and eager to learn and grow in a dynamic environment.
• Passionate about engineering

• Eager to learn and grow

• Excited about working in a dynamic environment
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Dsa questions like search sort

Q1. Lifecycle hooks of Angular
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Angular lifecycle hooks are methods that allow you to tap into specific points in a component's lifecycle.
• ngOnChanges: called when an input property changes

• ngOnInit: called once the component is initialized

• ngDoCheck: called during every change detection run

• ngAfterContentInit: called after content (ng-content) has been projected into the component

• ngAfterContentChecked: called after every check of the projected content

• ng...read more
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Q2. SOLID principles
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Q1. Questions on SQL
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Q1. Introduction and basic questions
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Mix of coding, aptitude, java, javascript

Q1. Resume based questions on project
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Q2. Basic SQL, Java streams questions
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Q1. Project related questions
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Q2. Internal working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where the pair will be stored.

• If multiple keys hash to the same index, a collision occurs and the pairs are stored in a linked list at that index.

• To...read more
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Q3. Design patterns I've used
Ans. 
I have used design patterns such as Singleton, Factory, and Observer in my projects.
• Singleton pattern ensures a class has only one instance and provides a global point of access to it.

• Factory pattern creates objects without specifying the exact class of object that will be created.

• Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and
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Q4. Print whole Fibonacci series using recursion.
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Print Fibonacci series using recursion
• Define a recursive function to calculate Fibonacci numbers

• Base case: return 0 if n is 0, return 1 if n is 1

• Recursive case: return sum of previous two Fibonacci numbers

• Print each Fibonacci number in the series
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Q5. Show my Github projects, and the interviewer didn't even properly looked into the code.
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Q1. What are services in Drupal?
Ans. 
Services in Drupal are reusable objects that perform specific functions, such as database queries or sending emails.
• Services are defined in YAML files and can be accessed throughout a Drupal site.

• They are used to encapsulate reusable functionality and promote code reusability.

• Examples of services in Drupal include the database service for interacting with the database, the mail service for sending emails, and the logge
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Q2. How to debug in Drupal?
Ans. 
Debugging in Drupal involves using tools like Devel module, watchdog(), and error logs.
• Enable Devel module for debugging information

• Use watchdog() function to log messages to Drupal's watchdog log

• Check error logs for PHP errors and warnings

• Use dpm() function to print variables for debugging purposes
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