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What is Abstraction in Object Oriented Programming? Abstraction in java is used to hide the complexity of a system by exposing the method signature of the system but concealing its implementation. Java implements abstraction using interface and abstract class and so it would be easier to explain abstraction by explaining what interfaces and abstract classes … Read more
What is Amazon S3 bucket Amazon S3 bucket (Simple Storage Service) is a storage service from Amazon where you can store and retrieve objects in the cloud using a web service. The web service operation can trigger functions such as lambda. A typical use case is where you store an image in the S3 bucket … Read more
What is Object Oriented Programming (OOP)? Object Oriented programming is a programming paradigm wherein all information is stored within the object and all ‘actions’ are performed by the objects. In the first tutorial, we explained the concept of Objects and classes. We defined “class” as a template that stores information about the state(customer’s name, address … Read more
What is polymorphism in Java? Polymorphism in Java is the principle by which an object can have multiple forms but each form conforms to a contract. Polymorphism can be thought of as a direct consequence of abstraction. In the earlier section, we say how abstraction separates method definition from its implementation. When we have two … Read more
What is Encapsulation in Java? Encapsulation in java is a principle by which data is hidden in an Object and can be accessed by the outside world only through accessor methods. The simplest way to understand encapsulation is to look at the basic data types such as Integer or Double. These data types hide the … Read more
In the previous tutorial we saw how to create AWS EC2 instance using the console. In this tutorial, we will learn how to create AWS EC2 instance using the CLI (Command Line Interface). create AWS EC2 instance using CLI What is Amazon CLI Amazon CLI stands for Amazon Client Line Interface. It is a command … Read more
What are the Access Modifiers in Java? Access Modifiers in Java control access to classes, methods, and variables. There are four basic access modifiers and they are public, protected, private and no modifier (Default). We will use the word default instead of no modifier for the rest of the tutorial. Here’s a summary of the … Read more
This tutorial walks through the steps of creating an Amazon Elastic Cloud Compute (EC2) instance. We will create a unix instance that is available in the free tier. If you are new to Amazon EC2, please check this introduction article. Steps to create an Amazon Elastic Cloud Compute (EC2) instance. Step 0 : EC2 Launch … Read more
What does the import statement in java do? In an earlier tutorial we saw an introduction to java. In this tutorial, we will look at using imports in java. To state it plainly – import statements allows us to use the name of the class in our code instead of its fully qualified name. What … Read more
Introduction to Java – The first Java program In the first tutorial we saw an introduction to java class and objects and then we learnt about Java packages. In this tutorial, we start our wonderful journey into the world of java by writing our first program. We will write the ubiquitous “Hello World” program. The … Read more