Stack is an abstract data type. Stack can be implemented using Linked List or Array. It follows LIFO principle (Last In First Out) and supports push(), pop() and peek() operations. Stack operations For this explanation, let’s consider that we implement the stack using LinkedList. push() In stack, the push operation Read more…
ArrayList is one of the implementation of the List interface. It is internally a resizable-array under the hood. ArrayList is equivalent to Vector but the only difference is it is not synchronized. ArrayList uses Array internally to store the data. Hence as like Array, random access is possible and it Read more…
An Array is a data structure to store elements of same type. Each element can be accessed by index. Hence random access is possible using Array. Arrays can be of any dimensions. Single and two dimensional arrays are commonly used. Two dimensional arrays are used for mathematical calculations (for example, Read more…
AWS provides an option to take snapshots of the EBS volume. EBS snapshots come handy when we want to recover our EBS volumes from any unforeseen disasters or failures. It would be even nice if you can automate your Amazon EBS snapshot creation and deletion. It’s quite simple using the Read more…
In this post, I would like to mention one of the feature of oracle database i.e Oracle flashback query. Recently we as a team involved in the activity of bad data correction. One fine day, for some bug in the PL/SQL code, the good data got deleted as well. Well! Read more…
In this post, let’s see the techniques about securing the Spring REST API using OAuth2. We will start by building an Authorization server to generate OAuth2 tokens. Then we will build our REST API which is the resource server. Finally, we will configure the security aspects for our resource server Read more…
In this post, let’s see how to integrate Spring Boot with Amazon DynamoDB. I have been exploring the option of creating the REST API using Spring Boot backed by DynamoDB. I will share the information that I have learned during the development process with a simple project named Tasklet API. Read more…
Spring Boot is developed by Pivotal Software to make the applications development easier. With Spring Boot we can create stand-alone, production-grade applications easily with minimum configuration. In this post, let’s see how to build a simple REST API endpoint using the Spring Boot. Create the project structure To create the Read more…
Java 9 is a major feature release of the Java platform and the key features include Java Platform Module System(JPMS), Java Shell and lot of improvements to JVM and core libraries. In this post, let’s have a look at the Java 9 modules and write programs to get started in Read more…
Angular is a framework which makes the web applications development easier. Recently I have been exploring the Angular to build a single page application(SPA). When doing so, I came across a need to build a form which takes the user details and contact the server back-end to save the details. Read more…