Transcript Eclipse - New Paltz

Eclipse
Begin at the Beginning
Where to Find it:
•
•
•
•
www.eclipse.org
www.eclipse.org/articles
www.eclipse.org/newsgroups
www.eclipse.org/eclipse/development/main.html
Install and run:
• Download and decompress in install directory
C:\Program Files\eclipse
•
•
•
•
•
•
Does not modify registry
Repeat to reinstall
No hidden spy-ware
(Re)installation is painless
Install your own Java jre or jdk beforehand
Run eclipse.exe; make your own shortcut, etc
First Look (Resource Perspective):
view
Toolbar with
Resource
Perspective
selected
editor
view
view
What is a Perspective?
• Collection of views (not editable) and editors
• Good for a particular task
– Resource Perspective: managing files (functionality found in
the java perspective)
– Java Perspective: developing java code
– Debug Perspective: debugging java code
• Three views in this perspective:
– Navigator: displays file system
– Task: lists outstanding tasks
– Outline: presents outline (if it exists) of other resources
work, work, work
Workbench versus Workspace
• Workspace:
– Asked at first startup to specify file system location. This
becomes your workspace.
– Put it outside the Eclipse home directory (for easy re-install)
– Manages resources, grouped as projects
– Handles communication between components
– You can have several workspaces
• Workbench:
– Displays menus and toolbars (perspectives decide which)
– Looks “native”
The Eclipse Platform
native code
The eclipse platform kernel
manages
resources
basic
GUI
Workspace Component
Workbench Component
Team Component (CVS)
Help Component (XML)
CVS
client
extensible
JDT plug-in
java devtool
PDE plug-in
plug-in devtool
Additional
Plug-in
Additional
Plug-in
plug-ins come with their own
perspectives, views, editors, etc
roll-your-own
Multiplicity:
• You can start up multiple Eclipse windows
(Java and Debug Perspectives for example)
• You can have multiple Eclipse installs unzipped in
different install directories.
• When testing new plug-ins there is even a “runtime
workbench” so you won’t mess up your current work
environment.
Default perspective:
• Since we want to develop java code the default
perspective for us is the Java Perspective
Select Window/Preferences…/General/Perspectives
and from the Available List select Java and click on Make Default.
First Java Project:
• Select File/New/Project/Java Project
and click on Next
• The following window appears
A new java project:
Becomes the subdirectory
where project files stored
Separate src and bin
directories
Perspectives, Views and Editors:
The Workbench has
several perspectives;
only one is visible at
a time.
WorkBench
Resource
Java
Debug
Perl
etc
*
*
View
Perspective
*
Navigator
Package
Console
Tasks
etc
*
Editor
*
A perspective is
a collection of
views and editors
that also appear
in different
perspectives
*
JDT Java code editor
XML editor
Mocrosoft Word
etc
Views vs Editors:
•
•
•
•
Views display data without the ability to edit
Editors edit!
Views and Editors get stacked
Select
Window/Preferences/General/Editors/File Associations
to associate editors with file extensions
• Double clicking on a Java class in the Package View
opens the Java editor on the .java file.
• Perspectives come with a predefined (but modifiable) set
of Views and Editors
The Java Perspective
Java file editor
Perspective
toolbar
Project
Class
files and
contents
List of all
open
projects
(deleting a
project from
this view
does not
delete the
project from
the file
system)
Class
outline
Output window
Creating a Java class:
• Click on circled-C icon
• Select File/New/Class
• Right-click Package Explorer View and select New/Class
New Java class dialog
Typically the
project folder
Name of the
class
Get used to “packaging”
your java classes
Java coding:
•
•
•
•
•
Code Assist prompts with method/variable names
Invoked by typing . operator or Ctrl-space.
Editor red-lines syntax errors (with fix hints)
Reformat by selecting Source/Format
Modify Code Assist by selecting
Window/Preferences/Java Editor/Code Assist
• Quick Fix suggests code fixes. Hover over error/light
bulb icon in left margin marker bar
• Minimize comments and method bodies
Scrapbook:
• Create a new scrapbook page
File/New/Other/(Java Run/Debug)/Scrapbook Page
The file extension will automatically be .jpage.
• From here you can execute code snippets by following
the steps on the following slide.
• If you need to import other packages right click the
scrapbook editor and select Set Imports.
Using the Scrapbook:
1: Double click
the Package
View scrapbook
entry to open
an editor.
2: Copy or type code to be executed
into the editor
3: Select the code you
want to execute
4: Right click the
editor window and
select Execute
How you include
import statements
5: View the output in the Console window
The Package Explorer:
• Deleting projects from this view doesn’t delete them from
the file system
• Open an existing project by importing it to this view.
Select File/Import
Disaster Recovery
•
•
•
•
•
Save your useful Workspace project folders
Delete your Eclipse directory.
Unzip the Eclipse download
Replace any project folders in your new Workspace
New version of Eclipse?
– copy old project folders to new Workspace directory