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Tag Archives: Core Java

What is magic number CAFEBABE in java class file?

November 29, 2017
Posted by Abhi Andhariya

Java Compiler compiles a java source code into bytecode and stores it into .class file which will then get executed by JVM. Everybody knows about it. But do you know each class file in Java starts with magic number CAFEBABE?  compelling, isn't it? 😀  After reading this article, you will be able to answer below questions: […]

Find from where java class is loaded | Class Loader SubSystem

November 1, 2017
Posted by Riteeka Rathod

In previous article, we discussed about 3 activites of Class Loader SubSystem i.e. Loading, Linking, Initialization and its Types of Class Loader  i.e. Bootstrap Class Loader or primordial Class Loader, Extension Class Loader, Application Class Loader or System Class Loader. We have also seen how these Class loader uses Delegation hierarchy algorithm  to load Classes into memory area. In this article we'll discuss more about Class Loader and how […]

Performance Issue with HashSet RemoveAll() method

October 12, 2017
Posted by Abhi Andhariya

In our previous article on HashSet internals, we have seen internal implementation of its add(), remove(), contains(), clear(), iterator() and isEmpty() methods. One of our readers has raised question about How efficient is HashSet removeAll() method? As it requires detailed explanation, we have decided to write separate article on it.   What does removeAll() method do? Before going into internals of […]

Morgan Stanley Interview Questions – Set 6

October 8, 2017
Posted by Pumpkin

I have appeared for Sr Java Developer position at Synechron Technologies. I cleared three F2F interview rounds of Synechron. I had also cleared two telephonic rounds with Synechron's client Morgan Stanley. After that I was invited for last two F2F rounds with Morgan Stanley at Bangalore. Overall experience was very good. Synechron has provided TO and FRO flight […]

Morgan Stanley Interview Questions – Set 5

October 8, 2017
Posted by Rahul Jain

I have appeared for Java Developer requirement at Wissen Infotech, Bangalore Location. Requirement was for their client Morgan Stanley and it was my second telephonic interview round with Morgan Stanley. Duration : 30 Minute. I have also shared my interview experience with Wissen Infotech as well as my first interview round with Morgan Stanley.  Tell me about your […]

Morgan Stanley Interview Questions – Set 3

September 28, 2017
Posted by Rahul Jain

I have appeared for Java Developer requirement at Wissen Infotech, Bangalore Location. Requirement was for their client Morgan Stanley and it was my first telephonic interview round with Morgan Stanley. Duration : 1 hour. I have also shared my interview experience with Wissen Infotech as well as my second interview round with Morgan Stanley..  Introduction and Project discussion […]

How is HashSet implemented internally in Java?

September 27, 2017
Posted by Abhi Andhariya

In our previous article, we have seen internal implementation of SynchronizedMap and the difference between HashMap, Hashtable, SynchronizedMap and ConcurrentMap.  In this article, we will understand how does HashSet work internally? How JDK implementers have reused HashMap effectively for HashSet implementation.   The best way to understand internal implementation of any built-in Java class is by looking into its […]

Morgan Stanley Interview Questions – Set 2

September 23, 2017
Posted by Sejal Thakkar

I have cleared three rounds of Synechron and after that they scheduled my telephonic interview with their client Morgan Stanley.  This round was more focused on Core Java, SQL and Problem solving skills. Interviewer also asked few questions on Spring framework.  Problem Solving / Programming For a given interger array, find two subarray of size 2 […]

Hashtable vs SynchronizedMap vs ConcurrentHashMap

Java Collection classes are heart of Java API.  It is essential to use built-in java collections like HashMap, ArrayList or LinkedList for accessing, storing and processing data in java applications. For Example, we have extensively used HashMap to transfer data between two layers of our MVC framework.   In all core java interviews, you will definitely face questions on […]

Synechron Interview Questions – Set 1

September 20, 2017
Posted by Pumpkin

Synechron had arranged walk-in drive at Ahmedabad location for multiple opening at Mumbai, Pune and Bangalore location.  I have appeared for Sr Java Developer position. I got a call from Ethos HR consultancy and interview was scheduled at the office of Ethos HR, Ahmedabad. Arrangement by Ethos HR was very poor and unprofessional. However, interviewers were very […]

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