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06: Capture throughput & latencies with “Metrics Core” tutorial

“Metrics Core” is a very handy framework to gather insights & tune performance of high-throughput and low-latency services. Here is a very simple core Java multi-threaded application that gathers metrics with this library. Step 1: Create a maven project Press enter for all prompts to use the default values.

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07: Reactive Programming (RP) in Java Interview Q&A

Q1. Explain “pull” vs “push” paradigms (aka imperative/interactive vs reactive) with respect to processing data in programming? A1. Interactive/imperative Programming (Pull): is all about asking for something and getting it in return. One common pattern in this world is the iterator pattern, which loops through and pull data out of…...

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05: Java primitives & objects – memory consumption interview Q&A

Q1. How much memory space does a primitive type int occupy in Java? A1. 4 bytes. Q2. Java objects get stored in the heap memory space, but how about the primitive variables? A2. It depends. 1) Primitives defined locally would be on the stack.

2) If a primitive is…...

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Posted in Data types, JVM, Low Latency, member-paid

03: Java GC tuning for low latency applications

This assumes that you have read the basics on Java GC at Java Garbage Collection interview Q&A to ascertain your depth of Java knowledge. This is a must know topic for those who like to work on low latency applications. Q1. In what ways does GC impact latency and throughput…...

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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 FAQs Java Key Areas, Java Architect Interview Q&A, Judging Experience Interview Q&A, Low Latency, Performance, Scalability
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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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04: Understanding Big O notations through Java examples

Q. Have you seen job advertisements requiring Java candidates to work in real-time or high volume transaction processing systems? If you are applying for such jobs, you can be quizzed on Big O notation. Here are some basics to brush up on. Big-O gives you the upper bound. For example, if you need to…...

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Posted in Big O notation, Collection and Data structures, Low Latency, member-paid

600+ Java Interview Q&As ♥Free|♦FAQ

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200+ Java Interview FAQs – Memory Joggers

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16 Java Key Areas to be a top-notch

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80+ Java Tutorials – Step by step

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100+ Java Coding Exercises

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