03-Java IDE.v3.1

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Java IDEJava IDE

Dwight Deugo ([email protected])Dwight Deugo ([email protected])

Nesa Matic ([email protected])Nesa Matic ([email protected])

www.espirity.com

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2 2003-2005, Espirity Inc.

Additional Contributors

None asofSeptember, 2005

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Module Overview

1. Building and Running Java Classes

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Module RoadMap

1. Building and Running Java Classes Developing Java applications

Projects, packages, classes

Browsing Java code

Searching Java code

Organizing Java code

Using Code Assist

Running Java applications Scrapbook

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Java DevelopmentTooling - JDT

EclipsesJava DevelopmentEnvironmentisoften referredto asJDT Java DevelopmentTooling

Using theJDT youcan dofollowing withtheJava programs:

Write

Compile

Test Debug

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Perspectives

When developing Java codecommonlyusedperspectives are:

Java Perspective

Designedforworking withJava projects Java Browsing Perspective

Designedforbrowsing structureofJava projects

Java Type HierarchyPerspective

Designedforexploring typehierarchy

Debug Perspective

Designedfordebugging Java programs

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Java Perspective

Contains: Editor area

Package ExplorerView

Hierarchy View

Outline View

Problems View

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Java Browsing Perspective

Contains: Editor area

Projects View

Packages View

Types View

Members View

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Java Type HierarchyPerspective

Containseditor area and Hierarchy View

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BuildPathProjectPreferences

Youcan setglobalpreferencesfor a project SelectWindow ->

Preferences -> General ->Java to getJavaPreferences

Goodidea toseparateyourJava filesintosource andcompileddirectories (srcandbin)

This action only needsto

bedoneonce Donefor all subsequentprojects

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Creating Java Project

Projectusedtoorganizeresources (source, class,icons) for a project

TocreateJava project: SelectFile New Project

fromthemenu TheNewProjectwizardcomesup

SelectJava Java Project

ClickNext

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NewProjectWizard

SpecifyProjectName ClickNext

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Java Settings

SpecifyJava settings Outputfolder (wherecompiledfileswill bestored)

External jarfilesprojectdependson

Classesfromotherprojectsthatarereferencedin theproject

ClickFinish

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ProjectProperties

Youcan changetheJava buildpath atanytime ChooseProperties fromthecontextmenuwhileselecting theproject

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Creating Packages

PackagecontainsJavaclassfiles

Tocreate a packagefor a project:

Selectthesrcfolderintheproject

ChooseNew Packagefromthecontextmenu

Specifypackage name

ClickFinish

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Creating Classes

Tocreate a classin apackage:

Selectthepackage

ChooseNew Class

fromthecontextmenu

The Classwizardcomesup

Specifyclassdetails

ClickFinish

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Using CodeAssist

When activated, code assistopens a listofavailablecodecompletions

CodeAssistactivatesbyCrtl+Space Activates automaticallywhen a message needstobesentto anobject(afterthedotistyped)

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Using Quick Fix

Useful ifJava compilershowserrors Givesoptionsforfixing theerrors

ActivatedthroughEdit Quick Fix menuoption

Errorindication

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Searching forJava Classes

When developing Java application a goodsearchmechanismis veryimportant

Youoften searchforclass, methoddeclarations, andreferences

Itisimportanttobe abletofindthingsquickly

EclipseJava Searchmechanismis veryextensive

Itallowsyoutosearchfor:

Types, methods, constructors, packages, andfields Declarations, Implementers, References

In thescopeofWorkspace, Working Set, or SelectedResources

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Organizing Java Code

Eclipsecomeswithextensivesupportfororganizing andrefactoring Java code

Itispossibleto:

Generate getters andsettersforthefields Organizemissing importstatements

Movefields, methods, classes

Renamemethods, classes, packages

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Generating Getters and Setters

Availableforcreatinggetandsetmethodson thefields

Itsupports

encapsulation ActivatedbychoosingSource Generate

Getter and Setterfrom

theeditorscontextmenu

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Refactoring

AvailablefromtheR

efactorcontextmenuoptionin theeditor

Helpswithrefactoring Java code

Allowsfor:

Renaming Methods, fields, packages, projects, parameters, or local

variables

Changing ofmethodsignature

Pull up a fieldormethod (intosuperclass)

Pushdown a fieldormethod (intosubclass) ExtractInterface (generateinterfacefromclass)

Generalizetype (changetypeoffields andmethods)

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Running Java Classes

To Run Java application ChooseRun Run fromthemenu

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Console View

RepresentsstandardJava console Opensbydefaultwhen standardJava outputisused

Can alsobeopen fromWindow Show View menu

System.out.println("this is a demo");

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Scrapbook

Allowsforwriting andexecuting ofJavacode

Veryuseful forquicktestofJava codethatyou

write TheJava codein the Scrapbookcan be:

Displayed as a string when evaluated

Inspectedwhen evaluated

Opens an Inspector viewwhereyoucan seereturningobjectfromevaluation and all containing fields

Executed

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Scrapbook

Itiscreatedbyselecting aprojectandchoosing New Other Java Java

Run/Debug Scrapbook

Page fromthePackageExplorerscontextmenuandthen entering thenameofthepage

Yourscrapbookpagewill

become a resourcein yourproject

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Scrapbook

Toopen thescrapbookpagejustclickon theresource

Itopensup like a Javasourcefileeditor

TypeJava code andselectthecontext

menuto DisplayorInspect

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Scrapbook

Class namesmustbefullyqualifiedin whatyoutype

Setimportstomake lifeeasier

Thinkofyourscrapbook asa pagethatEclipsewilltakethesourceyoutype,wrapitin a classwithyoursourcein themain menu,

then compile andexecute

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Summary

Youhave learned: Howtocreateprojects, packages andclasses

HowtobrowseJava code andsearchforJava

code Howtousecoding assistance

HowtoorganizeJava code

Howtorun Java code

Howtousethe Scrapbook

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Labs!

Lab: Building and Running a Java Application

03-Java IDE.v3.1

Documents

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