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Category Archives: Interview Questions

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Trapping Rain Water | Algorithm Problem

October 29, 2017
Posted by Pumpkin

In this article, we are going to solve the trapping water problem also known as Raees's Liquor Tank problem. This kind of problems are asked very frequently in interviews and online programming challenges. Problem Statement We need to find the maximum volume of water/liquor that can be stored in between buildings or bars as shown in the […]

Sapient Global Markets Interview Questions – Set 3

Hey everyone, I am writing this article for the people who wants to appear for Sapient Global Markets. I appeared for Senior Application Developer I in Sapient Global Markets Bangalore on August 2017. I would Like to share my experience with you guys. I will cover Technical round question and some brief intro of Sapient GM process. […]

How is HashSet implemented internally in Java?

September 27, 2017
Posted by Pumpkin

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 […]

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 […]

View vs Materialized View | Oracle SQL

September 10, 2017
Posted by Pumpkin

Every Java Developer is expected to have basic knowledge of database like SQL Queries, joins, having clause, group by, views, stored procedures, cursors, triggers, etc. If you are preparing for Java / J2EE interview, you should also prepare basic SQL interview questions. In our previous article on SQL interview Questions, we have seen differences between UNION and UNION […]

Program to find nth digit of the series 3, 5, 6, 9, 10, 12, …

August 20, 2017
Posted by Pumpkin

Bit Manipulation programming questions are integral part of any online coding challenges or programming rounds of 3-4 year exp Java/C/Python developer interviews. So, why are we talking about bit manipulation in this series problem? Lets look at the binary representation of all the numbers in this series. Decimal Digit Binary Representation 3 0011 5 0101 6 […]

Program to check if a given number is power of two or not?

August 20, 2017
Posted by Pumpkin

In this post, we will discuss about one of the easiest and commonly asked Bit Manipulation Interview Question i.e. Write a program to check if a given number is power of two or not?   This post is continuation of our previuos article Program To Find Number Of Set Bits In The Number.  Both of the approach […]

Program to find number of set bits in the Binary number

August 20, 2017
Posted by Pumpkin

In this post, we will discuss about one of the easiest and commonly asked Bit Manipulation Interview Question i.e. Find total number of set bits in the given number?  There are many approach to solve this problem. Here, we will discuss about below two approaches: & and >> Approach (Naive Approach) Brian Kernighan's Approach 1) & and >> Approach […]

Class Loader SubSystem | JVM Internals

August 5, 2017
Posted by Pumpkin

​In our previous article of JVM internals series, we learned about what is JVM, basic architecture of JVM and briefly understood its components. In this article we will discuss in detail about Class Loader SubSystem component of JVM architecture . Class Loader SubSystem Java’s dynamic class loading functionality is handled by the Class Loader SubSystem. […]

Program to find Unique Array Element

July 30, 2017
Posted by Pumpkin

Programming and coding interview questions are an integral part of any Java, Python or C++ application developer interview. No matter on which language you have expertise, good problem solving skills shows how efficient you are in solving any problem.  In this post, we will discuss one of the very commonly asked programming question. .!! Problem Statement: In […]

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