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02: ♥♦ 13 Tips to write low latency applications in Java

Extends Writing low latency applications in Java Q&A. Tip #1: Use a RTSJ (Real Time Specification for Java ) JVM.  IBM, Oracle, and other smaller vendors have implemented this, but it comes at a cost. Oracle’s JavaRT, IBM’s real-time WebSpere, and aicas JamaicaVM to name a few popular ones. In

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Posted in Java Architecture Interview Q&A, Java Key Area Essentials, Judging Experience Interview Q&A, Low Latency, Performance, Scalability
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Generating a UUID (aka GUID) in Java

UUID stands for Universally Unique ID. A UUID is known in the Microsoft world as as a GUID. What does a UUID look like? The UUID is not a string, but a 128-bit value. The UUID is a hexadecimal value like

How to generate a UUID in Java? The

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Posted in Judging Experience Interview Q&A

1. Asynchronous processing in Java real life examples – part-1

The scenario based questions are very popular with the job interviewers, and some scenario based questions are related to decoupling and asynchronous (aka non-blocking) processing in Java with message queues/topics, database tables where one process inserts data and another process consumes the inserted data, and Future objects in Java multi-threading.…...

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♦ 9 SQL scenarios based interview questions answered

Q1 How will you go about identifying duplicate records in a table? A1 The following SQL query will do the trick.

Note: Interviewer is testing if you understand that the aggregate queries need to have a “group by” clause on columns that are not aggregated. E.g. code, user_name. Finding

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Posted in Judging Experience Interview Q&A, SQL

Dealing with concurrent modifications in Java

There are scenarios where you need to deal with concurrent modifications in Java. Here are 2 scenarios that I can currently think of. Scenario 1: Looping through a list of items and removing an item in the list could lead to “ConcurrentModificationException“. Here is an example. Code that throws an…...

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♦ 01: 30+ Writing low latency applications in Java interview Q&As

Have you seen job advertisements requiring Java candidates to work in real-time, low latency, and high throughput systems? Wondering what questions you will be asked? You will be quizzed on the low latency application you had recently worked on especially the outcomes in terms of the latencies, response times, and…...

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Posted in Java Architecture Interview Q&A, Java Key Area Essentials, Judging Experience Interview Q&A, Low Latency, member-paid, Performance, Scalability

30+ SDLC activities you perform as a Java developer

Don’t get overwhelmed by this activities list. This proves why employers favor experience to just academic qualifications alone. It also emphasizes the fact why good technical skills must be complimented with good soft skills and right attitudes get things done as a software developer. I also vividly remember my first…...

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“How would you go about …” Q&A to judge Java experience

Q1. How would you go about judging the code quality of other developers? A1. 1) Code written with unit tests and progressively re-factored where necessary to make it more maintainable, testable, and readable. 2) Unit tests need to be written properly — mock objects using frameworks like Mockito and Power…...

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