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4 AOP interview Q&As with Spring, Aspectj & Java annotations examples

Q01. What is AOP, and how does it compliment OOP? A01. AOP stands for “Aspect Oriented Programming” and it compliments OOP. AOP is used for cross cutting concerns like logging, auditing, service retry, deadlock retry, performance profiling, transaction management, etc. In OOP unit of modularity is an object, and in…...

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03: ♦Q16 – Q17 Java Polymorphism vs Overriding vs Overloading

Polymorphism is the ability of a class instance to behave as if it were an instance of another class in its inheritance tree, most often one of its ancestor classes. Overriding is the means by which you achieve polymorphism. Java Polymorphism vs Overriding vs Overloading explained in detail to handle…...

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Posted in member-paid, OOP

14: Java Thread stop, resume, suspend & interrupt interview Q&As

Q1. Why are Thread.stop, Thread.suspend and Thread.resume deprecated? A1. We already learnt that “In Java programming, each object has a lock. A thread can acquire the lock for an object by using the synchronized keyword.” “The JVM uses locks in conjunction with monitors. A monitor is basically a guardian who…...

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Posted in member-paid, Multithreading

08: ♦ 7 basic Java Executor framework Interview Q&As with Future & CompletableFuture

Basic level Java Executor framework Interview Q&As with Future & CompletableFuture (introduced in Java 8), which you would be using very often in Java apps. Q01. What is an Executor Framework? A01.In Java 5, Executor framework was introduced with the java.util.concurrent.Executor interface. This is a framework for 1) facilitating thread-pools.…...

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Posted in member-paid, Multithreading

02: ♥♦ What is wrong with this code? Heap Vs Stack, Thread safety & Synchronized

This post covers must know Java Multithreading basics – Heap Vs Stack, Thread-safety & Synchronization. When you have a multithreaded Java application, you need to code in a thread-safe manner. Java interviewers may ask you to detect thread-safety issues as discussed in “What is wrong with this code?“. 1.What is

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Posted in FAQs Free, Multithreading, What is wrong with this code?
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05: ♥ 7 Java FP (lambda expressions) real life examples in wrangling normal & big data

This post extends Transforming your thinking from OOP to FP. In Big-data, functional programming is prevalent when working with data sets. For example, writing a Spark job to work with RDDs (Resilient Distributed Data sets). In Imperative (E.g. OOP, procedural programming, etc) programming you can say

where you are

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Posted in FP, Java 8

07: Reactive Programming or Reactor pattern (RP) in Java Interview Q&As

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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Posted in Low Latency, member-paid, Reactive Programming

02: jvisualvm to detect memory leak – a quick tutorial style Java demo

This is a companion post to 8 Java Memory Management Interview Q&A demonstrating a memory leak scenario step by step with jvisualvm, which is a free profiling tool that gets shipped with JDK. Step 1: Code that causes memory leak Here is a sample code that causes memory leak. It

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Posted in jvisualvm profiling, JVM, Memory Management
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