java with eclipse - setup and getting started

7/28/2019 Java With Eclipse - Setup and Getting Started

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2010 Marty Hall

Java with Ecli se:Setup and Getting

ar e

Customized Java EE Training: http://courses.coreservlets.com/Servlets, JSP, JSF 2.0, Struts, Ajax, GWT 2.0, Spring, Hibernate, SOAP & RESTful Web Services, Java 6.

Developed and taught by well-known author and developer. At public venues or onsite at yourlocation.

2010 Marty Hall

For live Java EE training, please see training courses

at htt ://courses.coreservlets.com/.Servlets, JSP, Struts, JSF 1.x, JSF 2.0, Ajax (with jQuery, Dojo,Prototype, Ext-JS, Google Closure, etc.), GWT 2.0 (with GXT),

Java 5, Java 6, SOAP-based and RESTful Web Services, Spring,Hibernate/JPA, and customized combinations of topics.

Taught by the author ofCore Servlets and JSP, More



, .venues, or customized versions can be held on-site at your

organization. Contact [email protected] for details.


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Topics in This Section

Installing Java

Installing and configuring Eclipse

Importing sample projects

Executing simple desktop programs

Executing applets

2010 Marty Hall

Installing Java




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Java Versions

Java SE (Standard Edition) Core Java

Java version used in this class ,

all new projects

Naming conventions are confusing Java 6 == Java 1.6 == JDK 1.6

Java 5 == Java 1.5 == JDK 1.5

Java 2, version 1.4 = Java 1.4 == JDK 1.4

Java EE (Enterprise Edition)

Same core language, but adds in many libraries for Webapps an ot er enterpr se tas s

Many real-life deployments start with Java SE and thenget server that is bundled with Java EE libraries

Which Java SE Version Should

Server-Side ApplicationsUse the latest Java version that your app server supports

JDK 1.4 1.6, depending how old your server is

, . .

Desktop Applications

For best ower and s eed use Java 6 aka 1.6 If you install, use JDK 1.6

Use 1.5 only if project is old (but consider upgrading)

pp e sSeparate Java Plug-In is required in all recent browsers

,

On internet, most Java applet sites (e.g., Yahoo! Games)use JDK 1.4 or 1.5, but allrequire end-user installation


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Installing Java

Install Java 6http://java.sun.com/javase/downloads/index.jsp

Use this version. The JDK Java

Development Kit includes compiler for.java files, whereas the JRE Java

Runtime Environment is only for

executing prebuilt .class files.

This tutorial uses Eclipse, but if you prefer the

NetBeans environment, it is very easy to adapt

the instructions to that development

environment. So, if you prefer NetBeans or

your organization has standardized on it, use

s own oa ns ea o no n a on o e

one on the left.

Bookmark the Java API (JavaDocs) p: ava.sun.com avase ocs ap This is the most important Java reference for developers.

Eclipse integrates this API, but a separate link is still good

2010 Marty Hall

Installing Eclipse




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Installing Eclipse

Overview

for Java. Support for Java, HTML,

CSS, JavaScript, C++, PHP, andmore. . Choose Eclipse IDE for Java EE

Developers Latest version as of 8/2010 is

.

Features Checks your syntax as you type Automaticall com iles ever

time you save file Many tools: refactoring,

debugging, server integration,emp a es or common as s, e c. Low learning curve: beginners can

use Eclipse without knowing thesetools

Eclipse Memory Bug with Java. . _

ProblemWith JDK 1.6.0_21, Eclipse does not properly pass

memory parameters to Java. . . _ ,

to Eclipse 3.4, 3.5, and 3.6

SolutionFind the Eclipse installation folder, edit eclipse.ini, andadd the following line to the bottom of the file

-XX:MaxPermSize=256m

More details and a downloadable patched eclipse.ini http://www.coreservlets.com/

- -eclipse-jdk1.6.0_21-permgen-bug.html


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Running Eclipse

Unzip the downloaded fileCall the folder you unzip into installDir

Double click eclipse.exe rom nsta r n

Click on Next time you bring

up Eclipse, it willcome up in workbench automatically

Shortcut any eve opers pu c pse n on e r es op

R-click eclipse.exe, Copy, then go to desktop, R-click, andPaste Shortcut (not just Paste!)

Configuring Eclipse

For desktop apps, only one step neededTell Eclipse where you installed Java

Process n ow re erences ava nsta e s

Press Add, choose Standard VM, navigate to JDK

folder (not bin subdirectory) E.g., C:\Program Files\Java\jdk1.6.0_20

Check checkbox

Java versionand OK


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Eclipse: Running Programs

Executing program from existing projectOpen existing

project

Java file tobring it up in editor

R-click anywherein code

Java Application

Output goes inonso e a o om Note: Class must

have a main method

Eclipse: Making Projects

Creating new projectFileNew Project

Java Java Project

To simplify applets later,choose Sources/Classes

in same folder

Creating new classR-clickNew Class

You can choose to haveEclipse make mainautomatically

You can also copy/paste existingclass, then give it new name


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2010 Marty Hall

Building Java Manually



Creating and Running Program

Create the FileWrite and save a file (say Test.java) that definespublic class Test

. ., , ,Intellij IDEA), there are a number of text editors (e.g.,TextPad, UltraEdit, Brief) with good Java syntax support.

Compile the programCom ile Test. ava

> javac Test.java This step creates a file called Test.class

> java Test

This ste assumes our class has main method


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2010 Marty Hall

Simple Examples



Installing Sample Projects

Code from all tutorial sections is availableonlinehttp://courses.coreservlets.com/

Import project into Eclipse

Click on a ro riate tutorial sectionDownload ZIP file

The one for this section is called intro

ar c pse an go o or enc

File Import General Existing Projects intoWorks ace Select archive file not Select rootdirectory).

Then browse to ZIP file you downloaded, OK, Finish


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Basic Hello World Application

File HelloWorld.java:public class HelloWorld {

public static void main(String[] args) {" "

}

}

Notes App cat on s ngo or a stan -a one Java program

An application is a Java class that contains main ,that do can be directlyexecuted

Executing HelloWorld

In Eclipse (recommended)Compiling

Done automatically whenever you save a file

Executin R-click inside window, then Run As Java Application

Output (see Console tab at bottom),

ManuallyCom ilin

javac HelloWorld.java

Executing

Output Hello, World


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Basic Hello WWW Applet

File HelloWWW.java:

import java.applet.Applet;import java.awt.*;

public class HelloWWW extends Applet {

ublic void init() {

setBackground(Color.BLACK);

setForeground(Color.WHITE);

setFont new Font "SansSerif" Font.BOLD 30

}

g.drawString("Hello, World Wide Web.", 5, 35);

}


File HelloWWW.html:

HTML>HelloWWW: Simple Applet Test.

HelloWWW: Simple Applet Test.

Error! You must use a Java enabled browser.


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CompilingEclipse: save the file

Manual: javac HelloWWW.java

Running:Load HelloWWW.html in a Java-enabled browser

c pse, us rag e e on o rowser

2010 Marty Hall

Wrap-Up




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A Few Eclipse Tricks

Making a new project e ew ro ec ava ava ro ec

Choose Source/Classes in Same Folder

Making a new class R-click project, New Class

Autocompletion T e art of a class or method name Control-S ace

Inserting main method Type the word main, then Control-Space

. . Type the word sysout, then Control-Space

Renaming a variable or method Select method or variable, R-click, Refactor Rename

Will also change all places that refer to it

Summary

Downloading Javahttp://java.sun.com/javase/downloads/index.jsp

Downloading Eclipse ttp: ec pse.org

Downloading sample projects . .

Click on Java 6 Programming tutorial on left side

Import with File Import Existing Projects

Executing a class that has mainR-click in code, Run As Java Application


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2010 Marty Hall

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