Apptio Senior Developer Interview Questions and Answers

Q1. What is HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap allows quick access to values based on their keys

• Keys must be unique and values can be duplicated

• HashMap is not thread-safe and requires synchronization for concurrent access

• Java's HashMap implementation uses hashing to distribute keys across buckets
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Q2. It’s a collection framework.
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Q1. Closures, hostings, react js, redux, hooks basic
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Q2. Html5, css3, basic javascript stuff
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60mintues DSA level coding exam

Q1. React js, ReactHooks, es67 features, bootstrap
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Q1. Explain React life cycle
Ans. 
React life cycle refers to the series of methods that are invoked in the process of creating, updating, and destroying components.
• Mounting phase: constructor, render, componentDidMount

• Updating phase: render, componentDidUpdate

• Unmounting phase: componentWillUnmount
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Q2. Design a online calculator app
Ans. 
An online calculator app that allows users to perform basic arithmetic operations.
• Include buttons for numbers 0-9 and operators like +, -, *, /

• Implement functionality for clearing input, calculating result, and displaying history

• Consider adding advanced features like memory functions or scientific calculator mode
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Q1. What is class use in java
Ans. 
A class is a blueprint for creating objects in Java. It defines the properties and behaviors that objects of the class will have.
• A class is used to create objects in Java.

• It defines the attributes (variables) and methods (functions) that objects will have.

• Objects are instances of a class.

• Classes can be used to organize and structure code.

• Inheritance allows classes to inherit properties and behaviors from other classes.

• ...read more
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Q2. It is blue print of java
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Blue print is a sun microsystems best practice and enterprice in java developer
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Q3. Difference between exception and error
Ans. 
Exceptions are recoverable errors that can be handled programmatically, while errors are severe issues that cannot be recovered from.
• Exceptions are subclasses of the Exception class, while errors are subclasses of the Error class.

• Exceptions are caused by the application code and can be caught and handled using try-catch blocks.

• Errors are typically caused by the environment or system and cannot be easily recovered from.

• ...read more
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Q4. Exception is a we can't solve in problem in programmatically
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Ya really an exception is an abnormal event that araised during the execution of the program
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Q5. Error is a we can solve in programmatically
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Q6. What is abstraction
Ans. 
Abstraction is the process of hiding implementation details while showing only the necessary information to the user.
• Abstraction is achieved through abstract classes and interfaces.

• It helps in reducing complexity and increasing efficiency.

• For example, a car dashboard is an abstraction of the car's internal workings.

• Abstraction is one of the four fundamental concepts of object-oriented programming.
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Q7. What is java features
Ans. 
Java features include platform independence, object-oriented programming, and automatic memory management.
• Platform independence allows Java code to run on any platform without recompilation.

• Object-oriented programming allows for modular and reusable code.

• Automatic memory management frees developers from managing memory allocation and deallocation.

• Other features include exception handling, multithreading, and security.

• E...read more
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Q8. What is default package
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Default package is a package that does not have any name.
• Default package is also known as unnamed package.

• Classes in default package can be accessed from other classes in the same package but not from other packages.

• It is not recommended to use default package in production code.

• Example: package myPackage; // named package, package // default package
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Q1. SDLC process and how it is implemented in project
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Q2. About projects, it's Objective, the role I have worked, output
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Q3. Data structure, DBMS concepts
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