Search Interview Questions | More than 3000 questions in repository. There are more than 900 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know. |
|
| ||||
Interview Questions and Answers for 'Barclays' - 19 question(s) found - Order By Newest | ||||
Advanced level question. Frequently asked in High end product companies. Frequently asked in Google , Cognizant and Deloitte ( Based on 2 feedback ) | ||||
| ||||
Ans. 1. String Pool - When a string is created and if it exists in the pool, the reference of the existing string will be returned instead of creating a new object. If string is not immutable, changing the string with one reference will lead to the wrong value for the other references. Example - String str1 = "String1"; String str2 = "String1"; // It doesn't create a new String and rather reuses the string literal from pool // Now both str1 and str2 pointing to same string object in pool, changing str1 will change it for str2 too 2. To Cache its Hashcode - If string is not immutable, One can change its hashcode and hence it's not fit to be cached. 3. Security - String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Making it mutable might possess threats due to interception by the other code segment. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  java   oops   string   string class   immutable  immutability   advanced Asked in 39 Companies expert   frequent | ||||
Try 4 Question(s) Test | ||||
Very frequently asked in companies using SOA. | ||||
| ||||
Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines - 1. http for client server communication, 2. XML / JSON as formatiing language , 3. Simple URI as address for the services and, 4. stateless communication. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  java   web services   rest   java   j2ee  architecture Asked in 14 Companies intermediate   frequent | ||||
Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc ) | ||||
| ||||
Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  design patterns   ioc ( Inversion of Control )  dependency injection Asked in 83 Companies intermediate   frequent | ||||
| ||||
This question was recently asked at 'Barclays'.This question is still unanswered. Can you please provide an answer. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve   Asked in 1 Companies | ||||
| ||||
Ans. HBM Files ( Mapping ) DB Connection ( DB Connection String , User Name , Password , Pool Size ) SQL Dialect ( SQL variant to be generated ) Show SQL ( Show / No show SQL on Console ) Auto Commit ( True / False ) | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  hibernate   configuration   barclays Asked in 11 Companies | ||||
Frequently asked at HCL Technologies ( Based on 3 feedback ) | ||||
| ||||
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. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  java   exceptions   checked exceptions   unchecked exceptions   exception handling   checked vs unchecked exceptions Asked in 39 Companies basic   frequent | ||||
Try 1 Question(s) Test | ||||
| ||||
Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  bstraction  oops concepts  oops principle Asked in 22 Companies | ||||
| ||||
Ans. Multiple servlets serving the request in chain. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  java   web application   servlets Asked in 1 Companies   rare | ||||
| ||||
Ans. Assert works only if assertions ( -ea ) are enabled which is not required for Verify.Assert throws an exception and hence doesn't continue with the test if assert evaluates to false whereas it's not so with Verify. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  assert   junit   mockito   verify   testing   unit testing Asked in 5 Companies | ||||
| ||||
Ans. NameNode stores MetaData (No of Blocks, On Which Rack which DataNode is stored etc) whereas the DataNode stores the actual Data. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  hadoop   at&t Asked in 2 Companies | ||||
Must know at all levels. Among Top 10 frequently asked questions in Java. Very frequently asked to fresh graduates or less experienced professionals. | ||||
| ||||
Ans. Its a facility for code reuse and independent extension wherein a derived class inherits the properties of parent class. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  inheritance  object oriented programming (oops)  oops concepts  oops concepts  java concepts  code reuse  code re-use   classes  derived classes Asked in 14 Companies basic   frequent | ||||
| ||||
Ans. Combiners are used to increase the efficiency of a Map Reduce program. They are used to aggregate intermediate map output locally on individual mapper outputs. Combiners can help you reduce the amount of data that needs to be transferred across to the reducers. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  Hadoop Systems  BigData   hadoop combiners Asked in 1 Companies | ||||
| ||||
Ans. B ctor B ctor B ctor A ctor A ctor | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve   Asked in 1 Companies | ||||
| ||||
Ans. Assigning a value of one type to a variable of another type is known as Type Casting. Example : int x = 10; byte y = (byte)x; In Java, type casting is classified into two types, Widening Casting(Implicit) widening-type-conversion and Narrowing Casting (Explicitly done) narrowing-type-conversion. Widening or Automatic type converion - Automatic Type casting take place when,the two types are compatible and the target type is larger than the source type Example : public class Test { public static void main(String[] args) { int i = 100; long l = i; //no explicit type casting required float f = l;//no explicit type casting required System.out.println("Int value " i); System.out.println("Long value " l); System.out.println("Float value " f); } } Narrowing or Explicit type conversion - When you are assigning a larger type value to a variable of smaller type, then you need to perform explicit type casting. Example : public class Test{ public static void main(String[] args) { double d = 100.04; long l = (long)d; //explicit type casting required int i = (int)l;//explicit type casting required System.out.println("Double value " d); System.out.println("Long value " l); System.out.println("Int value " i); } } | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  typecasting  type casting Asked in 23 Companies | ||||
| ||||
This question was recently asked at 'Barclays'.This question is still unanswered. Can you please provide an answer. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve  Google Cloud Platform (GCP)  Amazon Web Services (AWS) Asked in 1 Companies | ||||
| ||||
This question was recently asked at 'Barclays'.This question is still unanswered. Can you please provide an answer. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve   Asked in 1 Companies | ||||
| ||||
This question was recently asked at 'Symantec,Barclays'.This question is still unanswered. Can you please provide an answer. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve   Asked in 2 Companies | ||||
| ||||
This question was recently asked at 'Barclays'.This question is still unanswered. Can you please provide an answer. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve   Asked in 1 Companies | ||||
| ||||
This question was recently asked at 'Barclays'.This question is still unanswered. Can you please provide an answer. | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like Discuss Correct / Improve   Asked in 1 Companies | ||||