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| Interview Questions and Answers for 'Ancestry' - 19 question(s) found - Order By Newest | ||||
 Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS and Coginizant (CTS) | ||||
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| Ans. If the Object value will not change, use String Class because a String object is immutable. If the Object value can change and will only be modified from a single thread, use StringBuilder because StringBuilder is unsynchronized(means faster). If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe(synchronized). | ||||
 Sample Code for String Sample Code for StringBuffer Sample Code for StringBuilder | ||||
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 Discuss Correct / Improve  java string class string stringbuilder stringbuffer String vs StringBuffer String vs StringBuilder String vs StringBuilder vs StringBuffer StringBuffer vs stringBuilder  Asked in 29 Companies  basic  frequent | ||||
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| Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features 1. Inheritance for Code Reuse 2. Abstraction for modularity, maintenance and agility 3. Encapsulation for security and protection 4. Polymorphism for flexibility and interfacing | ||||
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| Discuss Correct / Improve oops oops features Asked in 260 Companies basic frequent | ||||
| Very frequently asked.Usually among first few questions. | ||||
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| Ans. MVC is a Design Pattern that facilititates loose coupling by segregating responsibilities in a Web application 1. Controller receives the requests and handles overall control of the request 2. Model holds majority of the Business logic, and 3. View comprise of the view objects and GUI component | ||||
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| Discuss Correct / Improve j2ee mvc mvc design pattern design pattern struts spring web application web frameworks ebay Asked in 60 Companies basic frequent | ||||
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| Frequently asked at HCL Technologies ( Based on 3 feedback ) | ||||
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| Ans. Checked exceptions are the exceptions for which compiler throws an errors if they are not checked whereas unchecked exceptions are caught during run time only and hence can't be checked. | ||||
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| Discuss Correct / Improve java exceptions checked exceptions unchecked exceptions exception handling checked vs unchecked exceptions Asked in 39 Companies basic frequent | ||||
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| Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web. | ||||
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| Discuss Correct / Improve aws amazon s3 aws s3 aws storage amazon cloud storage amazon s3 Asked in 12 Companies | ||||
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| Ans. We are using Agile methodology. I attend daily stand up where the development leads takes the status of assigned stories, achievements, any bottlenecks or challenges. We follow iteration of 2 weeks. | ||||
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| Discuss Correct / Improve sdlc agile methodology software system analyst software developer interview development lead project lead interview Asked in 14 Companies frequent | ||||
| Frequently asked in face to face interviews. | ||||
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| Ans. int count = 15; int[] fibonacci = new int[count]; fibonacci[0] = 0; fibonacci[1] = 1; for(int x=2; x < count; x++){ fibonacci[x] = fibonacci[x-1] + fibonacci[x-2]; } for(int x=0; x< count; x++){ System.out.print(fibonacci[x] + " "); } | ||||
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| Discuss Correct / Improve ebay fibonacci series Asked in 66 Companies basic frequent | ||||
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| Ans. Because String being an immutable object creates a new object upon each concatenation cycle. If there is any such need , we should use String Builder whose objects are mutable. | ||||
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| Discuss Correct / Improve string string immutable immutability for loop control statements loop statement Asked in 1 Companies | ||||
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| This question was recently asked at 'Ancestry,Sofi'.This question is still unanswered. Can you please provide an answer. | ||||
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| Ans. string and wrapper class objects | ||||
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| Discuss Correct / Improve immutability immutable immutability classes immutable immutability collections Asked in 3 Companies | ||||
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| Ans. Immutable objects are thread-safe so you will not have any synchronization issues.Immutable objects are good for Map keys and Set elements, since these typically do not change once created.Immutability makes it easier to write, use and reason about the code (class invariant is established once and then unchanged)Immutability makes it easier to parallelize your program as there are no conflicts among objects.The internal state of your program will be consistent even if you have exceptions.References to immutable objects can be cached as they are not going to change. | ||||
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| Discuss Correct / Improve immutable immutability classes benefits of immutable immutability classes Asked in 1 Companies | ||||
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| Ans. Here are the differences between Agile and Waterfall Methodology: The software development process is divided into different phases in the Waterfall model while Agile methodology segregates the project development lifecycle into sprints Waterfall is a structured software development methodology, and often times can be quite rigid, whereas the Agile methodology is known for its flexibility According to the Waterfall model, software development is to be completed as one single project, which is then divided into different phases, with each phase appearing only once during the SDLC. However, the Agile methodology can be considered as a collection of many different projects, which are nothing but the iterations of the different phases focusing on improving the overall software quality with feedback from users or the QA team If you want to use the Waterfall model for software development, then you have to be clear with all the development requirements beforehand as there is no scope of changing the requirements once the project development starts. The Agile methodology, on the other hand, is quite flexible, and allows for changes to be made in the project development requirements even after the initial planning has been completed All the project development phases such as designing, development, testing, etc. are completed once in the Waterfall model while as part of the Agile methodology, they follow an iterative development approach. As a result, planning, development, prototyping and other software development phases can appear more than once during the entire SDLC One of the major differences between Agile and Waterfall development methodology is their individual approach towards quality and testing. In the Waterfall model, the Testing phase comes after the Build phase, but, in the Agile methodology, testing is typically performed concurrently with programming or at least in the same iteration as programming While Waterfall methodology is an internal process and does not require the participation of customers, the Agile software development approach focuses on customer satisfaction and thus, involves the participation of customers throughout the development phase The Waterfall model can be regarded as a stringently sequential process, however, the Agile methodology is a highly collaborative software development process, thereby leading to better team input and faster problem solving The Waterfall model is best suited for projects which have clearly defined requirements and in which change is not expected at all, while Agile development supports a process in which the requirements are expected to change and evolve. Thus, if you are planning to develop a software that would require frequent overhauls and has to keep up with the technology landscape and customer requirements, Agile is the best approach to follow The Waterfall model exhibits a project mindset and lays its focus strictly on the completion of project development, while Agile introduces a product mindset that focuses on ensuring that the developed product satisfies its end customers, and changes itself as the requisites of customers change | ||||
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| Discuss Correct / Improve sdlc agile adlc vs agile Asked in 3 Companies | ||||
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| This question was recently asked at 'Ancestry'.This question is still unanswered. Can you please provide an answer. | ||||
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| Discuss Correct / Improve kanban agile kanban vs agile Asked in 1 Companies | ||||
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| This question was recently asked at 'Ancestry'.This question is still unanswered. Can you please provide an answer. | ||||
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| Discuss Correct / Improve linkedlist internal implementation of linkedlist Asked in 1 Companies | ||||
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| Ans. The Java collections framework (JCF) is a set of classes and interfaces that implement commonly reusable collection data structures. Although referred to as a framework, it works in a manner of a library. The JCF provides both interfaces that define various collections and classes that implement them. | ||||
| Sample Code for Map Sample Code for HashMap Sample Code for Treemap Sample Code for set Sample Code for hashset Sample Code for treeset Sample Code for list Sample Code for arraylist Sample Code for linkedlist Sample Code for queue Sample Code for priorityqueue Sample Code for concurrenthashmap Sample Code for vector Sample Code for stack | ||||
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| Discuss Correct / Improve collections Asked in 9 Companies basic frequent | ||||
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| Ans. Cname doesn't support naked domain names whereas aliasis does. | ||||
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| Discuss Correct / Improve aws route53 Asked in 3 Companies | ||||
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| Ans. Eventual consistency | ||||
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| Discuss Correct / Improve aws s3 aws storage amazon cloud storage amazon s3 Asked in 1 Companies | ||||
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| This question was recently asked at 'Alfresco Software,Ancestry'.This question is still unanswered. Can you please provide an answer. | ||||
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| Ans. Java 7 , SQL Server | ||||
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Which of the following has been introduced with Java 8 ?
