Core Java - Interview Questions and Answers for 'Architect' | Search Interview Question

Interview Questions and Answers - Order By Newest

Frequently asked these days as there are major changes in Java 8.

Q61. What are new features introduced with Java 8 ?

Ans. Lambda Expressions , Interface Default and Static Methods , Method Reference , Parameters Name , Optional , Streams, Concurrency.

Sample Code for Lambda

Sample Code for interface default

Sample Code for Optional

Sample Code for Streams

Sample Code for java.time

Sample Code for Predicate

Sample Code for Consumer

Sample Code for MapMerge

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Q62. Difference between TCP and UDP ?

Networking

Ans. http://www.cyberciti.biz/faq/key-differences-between-tcp-and-udp-protocols/

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Q63. Name few Java Mocking frameworks ?

Ans. Mockito, PowerMock, EasyMock, JMock, JMockit

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Q64. What would you do if you have to add a jar to the project using Maven ?

Maven

Ans. If its already there in Maven local repository, We can add that as a dependency in the project pom file with its Group Id, Artifact Id and version.

We can provide additional attribute SystemPath if its unable to locate the jar in the local repository.

If its not there in the local repository, we can install it first in the local repository and then can add it as dependency.

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Q65. Should we create system software ( e.g Operating system ) in Java ?

Core Java

Ans. No, Java runs on a virtual machine called JVM and hence doesn't embed well with the underlying hardware. Though we can create a platform independent system software but that would be really slow and that's what we would never need.

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Q66. What is Java primarily used for ?

Core Java

Ans. For creating platform independent software applications.

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Q67. What is the difference between JPA and Hibernate ?

Hibernate

Ans. JPA or Java Persistence API is a standard specification for ORM implementations whereas Hibernate is the actual ORM implementation or framework.

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Q68. Which UML diagrams you usually use for design ?

Design

Ans. Use Case Diagram, Component Diagram for High level Design and Class Diagram , Sequence Diagram for low level design.

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Q69. How do you coordinate and communicate with the team developers ?

Process

Ans. We as a team of developers , testers , analyst , lead and architect sit close to each other. Most of the time I would just jump to their seat and talk to them ( if required ). We have daily stand up where we discuss things that needs team attention.

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Q70. What kind of software architecture your organization follow ?

Design

Ans. We have multi tier architecture with multiple layers , We have series of web servers and applications in application tier, infrastructure libraries at middle tier and Database servers at the lower tier. We are using Oracle as Database, ESB ( Enterprise service Bus ) for asynchronous communication and Rest Web Services.

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Q71. Which web application framework you like and Why ?

Framework

Ans. I like Spring as it comes with inbuilt Dependency Injection framework. It has great online community and support and is proven to work well with ORMs like Hibernate. If we are not working with ORM and DI, Struts 2 is also good.

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Q72. Explain Application / Server architecture being used in your project ?

or

Explain your project architecture ?

Ans. We are using cluster of Web servers and Application servers. Load Balancer is used to manage the load between them. Down the layer we have middleware server and then DB server to access database.

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Q73. Design a Whats app like messaging application.

architecture

^{This question was recently asked at 'Bloomberg'.This question is still unanswered. Can you please provide an answer.}

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Library Management System has always been the favorite question. This questions is asked irrespective of level.

Q74. Write data models and service end points for Library Management System ?

Architecture

Ans. Following could be the business sub domains or database schemas in such a system

1. Users / Members
2. Sourcing
3. Inventory Management
4. Operations

Following services end points could be there

1. Users - addNewUser ( put ), removeUser ( post )
2. Sourcing - addSupplier ( put ), removeSupplier ( post )
3. Inventory Management - getInventory ( get )
4. Operations - checkIn ( post ), checkout ( post )

There could be following Tables in Database

1. Users / Members - MEMBER, MEMBERSHIP_TYPE
2. Sourcing - SUPPLIER, SUPPLIER_PRODUCT, PRODUCT_REORDER_LEVELS
3. Inventory Management - INVENTORY,PRODUCTS
4. Operations - TRANSACTION

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Q75. Explain your current project architecture.

Architecture

^{This question was recently asked at 'Oracle financial services'.This question is still unanswered. Can you please provide an answer.}

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Q76. Could you walk me through and draw out a sketch of a recent architecture project you completed ?

architecture

^{This question was recently asked at 'Microsoft'.This question is still unanswered. Can you please provide an answer.}

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