IDZ Digital Junior Android Developer Interview Questions and Answers

There were questions of basic aptitude

Q1. Introduce yourself
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Q2. About my projects
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Q3. What is Radix sort
Ans. 
Radix sort is a non-comparative sorting algorithm that sorts integers by processing individual digits.
• Radix sort works by sorting numbers based on each digit's value, starting from the least significant digit to the most significant digit.

• It can be implemented using counting sort or bucket sort as a subroutine.

• Radix sort is efficient for sorting integers with a fixed number of digits, like phone numbers or social secur
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Q1. Basic questions about class and objects and some DSA questions related to arrays.
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Q1. DSA basic questions and C++ questions related to polymorphism and class design patterns
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Q1. Some C++ 14/17 questions and OOPs concepts
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Q2. DSA questions based for basic game logics.
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Q1. Advanced OOPs and C++ questions
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Q2. DSA coding questions based on Stacks and Linked list
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Q1. Called me to Noida for a F2F HR round. I wasn’t given any Travel allowance. CTC negotiation was brutal. They were not willing to give me even a 5% hike on my previous salary.The HR and the Team said they’d...read more
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Q2. A month passed by. Sometimes they’d say the technical team who took your interview wasn’t available so that the CTC discussion could be further done. And somedays they’d just delay by saying we’d get back ...read more
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Q3. After a month of wasting my time. The HR finally called and said they rejected me based on the CTC. And are not even willing to negotiate because of my not so well performance in the technical rounds.
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3 online dsa questions easy to medium

Q1. What is object oriented programming
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code to manipulate that data.
• Objects are instances of classes, which define the structure and behavior of the objects.

• Encapsulation is a key principle, where data is kept private within the object and only accessible through methods.

• Inheritance allows classes to inherit attributes and methods from other cla...read more
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Q2. What is static Constructor?
Ans. 
Static constructor is a special type of constructor in a class that is called only once when the class is loaded into memory.
• Static constructor is used to initialize static data members of a class.

• It is automatically called by the .NET Framework when the class is first loaded.

• Static constructor does not take any parameters and cannot be called explicitly.

• Example: public class MyClass { static MyClass() { // initializat
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Q3. What are solid Principles
Ans. 
SOLID principles are a set of five design principles that help make software designs more understandable, flexible, and maintainable.
• Single Responsibility Principle (SRP) - A class should have only one reason to change.

• Open/Closed Principle (OCP) - Software entities should be open for extension but closed for modification.

• Liskov Substitution Principle (LSP) - Objects of a superclass should be replaceable with objects o...read more
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Q4. What is dependency injection
Ans. 
Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Commonly used in frameworks like Spring in Java
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What is static Constructor

Q1. What is the difference between Realm and Core Data?
Ans. 
Realm is a mobile database that is faster and easier to use than Core Data.
• Realm is faster than Core Data in terms of performance.

• Realm is easier to use and requires less code for implementation.

• Core Data is more suitable for complex data models and relationships.

• Realm is cross-platform and can be used for both iOS and Android development.

• Core Data is Apple's native framework for data persistence on iOS and macOS.
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Q2. What is the process for uploading an image to Firebase?
Ans. 
The process involves creating a reference to the Firebase storage, uploading the image data, and handling the completion callback.
• Create a reference to the Firebase storage using FirebaseStorage instance

• Get the reference to the image file using the file path or URI

• Upload the image data to the Firebase storage reference using putFile or putData method

• Handle the completion callback to get the download URL of the uploaded
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Required to write codes in python

Required to write codes in python

Q1. Time to tackle difficulties
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Q2. Time to learn things outside school
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