Getting Started With Java Downloading and installing software Running your first program Dr. DwyerFall 2012

Objective Set up a development environment on your laptop/desktop and run a program

What tools do you need? Components of the Java language ◦ Tool to test whether your program complies with Java syntax requirements (Java compiler – javac) ◦ Documentation describing what tools are available in Java ◦ Java runtime environment (JRE) – a kind of utility (like a plug-in) that runs Java code on a client (like a laptop or a phone)

Software Development Eclipse – is a tool that makes it easier to develop software Open source Can support other languages besides Java ◦ Editor – for writing code ◦ Support for testing – way to run code, display output, and other tools for fixing programming errors

Software downloads (2 parts) Java Development Kit (JDK) includes JRE – Java Runtime Environment Most recent version Java SE (Standard Edition) 7update 6 Google Java JDK (will include links to instructions) Java SE Downloads

Downloading Eclipse Download “Eclipse IDE for Java Developers” Consult instructions for installation depending on your operating system 32 bit or 64 bit? – doesn’t matter, but 64 bit does not work with Chrome (use Firefox)

Starting Eclipse Select a workspace ◦ This is like “My Documents” for eclipse, a place to keep all files related to your programs ◦ Can keep default or change it to a place easy to find (like the desktop) Step 1: Create a new project (Eclipse menu – File, new, New Java Project)

Create a project What is a project? ◦ Container for a collection of software components ◦ Need a project in order to run code in Eclipse ◦ We will start off with a simple project with one class

Add a Class – right click on project

What is a class? Container for a unit of code Every Java program has at least one class Class name must begin with Capital Check box to create “main” method stub ◦ What if you forget? ◦ Option one – delete the class and add another one with a different name ◦ Option two – need to type “public static ….”

Java program stub

Running a program

Program output

Your Assignment Install Java and Eclipse, run the program in listing 1.1 Take a screenshot of your program after it runs, copy it into a Word document with your name and upload to Blackboard

Recommendations for beginning programmers Practice by typing in examples from the book EXACTLY as you see them Java expects perfection Java does not tolerate sloppy typing LOL! Be humble – if it does not work, something really is wrong

Recommendations cont. Use the Internet – lots of tutorials and videos available Ask your instructor Ask your class mates and other Seidenberg students for help

What if you get stuck? Come to Seidenberg School offices with your laptop and ask tutors or other students for help me for help Use Google and YouTube to find Java/Eclipse videos/tutorials