1) Select fields instead of using SELECT *. The “*” is used as a short hand to query all available data from a table. If a table has many fields and rows, this takes database resources by querying a lot of unnecessary data. … Read more ›...
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16 FAQ JMS interview Q&As
Q1. What types of messaging paradigms are provided by JMS? A1. Point-to-Point: provides a traditional queue based mechanism where the client application sends a message through a queue to typically one receiving client that receives messages sequentially. A JMS message queue is an administered object that represents the message destination...
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17 Java Collection interview questions & answers
Java Collections interview questions and answers and Java String class interview Q&As are must know as you can’t write any decent Java application without these 2 APIs. This post focuses on Java Collection interview Q&As on differences between X and Y based on the Java Collection Framework (i.e. … Read...
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17 XML basics interview Q&As
Q1. What is an XML? A1. XML stands for eXtensible Markup Language. XML is a grammatical system for constructing custom markup languages for describing business data, mathematical data, chemical data etc. XML loosely couples disparate applications or systems utilizing JMS, … Read more ›...
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17+ DevOps CI/CD Jenkins interview Q&As
Q1. What is Jenkins? A1. Jenkins is an open source CI/CD (i.e. Continuous Integration & Continuous Delivery/Deployment) server written in Java with over 2000 plugins (E.g. Maven, Git, Amazon EC2, Docker, Ansible, etc) for various development, testing and deployment tasks. Refer to Jenkins Plugin Index for the plugins and the...
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18 Agile Development interview Q&A for Java developers
Q1. What are the typical roles and responsibilities of an agile core team? A1. The Product Owner represents the stakeholders and is the voice of the customer. He or she is accountable for ensuring that the team delivers value to the business. The Product owner writes typically the user stories,...
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18 Amazon S3 interview Q&As
Q01. What is Amazon S3 storage? A01. S3 stands for Simple Storage Service, which provides storage through web service interfaces. Unlike the other storage systems like Unix file system, HDFS (i.e. Hadoop Distributed File System), etc which are based on having folders and files, the S3 is based on a...
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18 Java scenarios based interview Q&As for the experienced – Part 1
Let’s look at scenarios or problem statements & how would you go about handling those scenarios in Java. These scenarios interview questions will judge your Java experience. Full list of Java scenarios based interview questions are covered at Judging your Java experience via scenarios based interview Q&As.
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18 Java scenarios based interview Q&As for the experienced – Part 2
This extends 18 Java scenarios based interview Q&As for the experienced – Part 1 #9 Single Sign-On Q09. Scenario: You have a number of applications like cash, mortgages, investments, etc where a user has to login separately into each system. For example, … Read more ›...
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19: Q125 – Q130 Apache Zookeeper interview Q&As
Q125. What is Apache Zookeeper & where can you use it? A125. Distributed applications like HBase, Solr, Kafka, etc run services on multiple nodes (i.e. computers) for scalability (i.e more nodes can be added) & redundancy (i.e. several nodes provide the same service & if one node is down another...
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2. Asynchronous processing in Java real life examples – part-2
Extends: 1. Asynchronous processing in Java real life examples – part-1. Example 3: Trade execution reports are received & processed asynchronously If you are working in an online trading application, you may want the functionality to queue trades and process them when the stock market opens. … Read more ›...
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2. Implement an in-memory LRU cache in Java with TTL
Q: Implement an in-memory cache in Java without using any frameworks. The basic requirements are – The TTL (Time To Live) for the cache items are ~10 seconds [just for demo]. – The system has plenty of memory. – … Read more ›...
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20 Java coding interview questions – tips & considerations
Java coding interview questions are very common in job interviews. Good coding skills are essentials for passing the peer code reviews with flying colours. Here are 17 coding tips with Java examples. Tip #1: If you are asked to write a function or code, … Read more ›...
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