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JAVA INTRODUCTION

 

Java Introduction

What is Java?

Java is a popular programming language, created in 1995.


It is owned by Oracle, and more than 3 billion devices run Java.


It is used for:

Mobile applications (specially Android apps)

Desktop applications

Web applications

Web servers and application servers

Games

Database connection

And much, much more!

Why Use Java?

  • Java works on different platforms (Windows, Mac, Linux, Raspberry Pi, etc.)
  • It is one of the most popular programming language in the world
  • It is easy to learn and simple to use
  • It is open-source and free
  • It is secure, fast and powerful
  • It has a huge community support (tens of millions of developers)
  • Java is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs
  • As Java is close to C++ and C#, it makes it easy for programmers to switch to Java or vice versa

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It is not necessary to have any prior programming experience.

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Java Getting Started

Java Install

Some PCs might have Java already installed.

To check if you have Java installed on a Windows PC, search in the start bar for Java or type the following in Command Prompt (cmd.exe):
Or use the shortcut keyboard keys windows+R. Type cmd at the new pop menu

C:\Users\Your Name>java -version
If Java is installed, you will see something like this (depending on version):

java version "11.0.1" 2018-10-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.1+13-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.1+13-LTS, mixed mode)
If you do not have Java installed on your computer, you can download it for free at oracle.com.

Note: In this tutorial, we will write Java code in a text editor. However, it is possible to write Java in an Integrated Development Environment, such as IntelliJ IDEA, Netbeans or Eclipse, which are particularly useful when managing larger collections of Java files.


Setup for Windows
To install Java on Windows:

  • Go to "System Properties" (Can be found on Control Panel > System and Security > System > Advanced System Settings)
  • Click on the "Environment variables" button under the "Advanced" tab
  • Then, select the "Path" variable in System variables and click on the "Edit" button
  • Click on the "New" button and add the path where Java is installed, followed by \bin. By default, Java is installed in C:\Program Files\Java\jdk-11.0.1 (If nothing else was specified when you installed it). In that case, You will have to add a new path with: C:\Program Files\Java\jdk-11.0.1\bin
  • Then, click "OK", and save the settings
  • At last, open Command Prompt (cmd.exe) and type java -version to see if Java is running on your machine







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