Introduction to Java

History of Java

Java was released in 1996 by James Gosling at Sun Microsystems
"Write once, run anywhere"
Based on C/C++
OOP (Object-Oriented Programming )

Why Java?

Developer Survey Results 2018 by Stack Overflow

Preparation

Installing Java SE 8

Editor

(NetBeans, BlueJ, Notepad++, etc)

Code Conventions

Oracle's Code Conventions for the Java Programming Language
Google Java Style Guide

Naming Rules

Class names are written in UpperCamelCase
Method names are written in lowerCamelCase
Variable names are written in lowerCamelCase
Constant names use CONSTANT_CASE: all uppercase

example

Prose form	correct	incorrect
"XML HTTP request"	XmlHttpRequest	XMLHTTPRequest
"new customer ID"	newCustomerId	newCustomerID
"inner stopwatch"	innerStopwatch	innerStopWatch

Let's code...

Example Code (HelloWorld.java)


public class HelloWorld {
  public static void main (String[] args) {
    String language = "Java";
    System.out.println("Hello World");
    System.out.println("Happy Coding with " + Language);
  }
}