getting started with java downloading and installing software running your first program dr....

Getting Started With JavaDownloading and installing softwareRunning your first program

Dr. Dwyer Fall 2012

ObjectiveSet 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 DevelopmentEclipse – is a tool that makes it

easier to develop softwareOpen sourceCan 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 EclipseDownload “Eclipse IDE for Java

Developers”http://www.eclipse.org/downloads

/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 EclipseSelect 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 projectWhat 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 codeEvery Java program has at least

one classClass name must begin with

CapitalCheck 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 AssignmentInstall Java and Eclipse, run the

program in listing 1.1Take a screenshot of your

program after it runs, copy it into a Word document with your name and upload to Blackboard

Recommendations for beginning programmersPractice by typing in examples

from the book EXACTLY as you see them

Java expects perfectionJava 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 availableAsk your instructorAsk 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

Email me for helpUse Google and YouTube to find

Java/Eclipse videos/tutorials