The purpose of this tutorial is to help novice users get started
with JDeveloper. It presents the basic concepts on which the tool is built and
seeks to familiarize you with the Integrated Development Environment (IDE).
Using a simple Java class as an example, you start using the basic components
of JDeveloper in order to create a new Application project.
Time to complete
You should be able to complete this tutorial
in approximately 20 minutes.
This tutorial helps you to get started with JDeveloper. It explains
the main concepts of the tool, describes how your work is organized, shows the
IDE and guides you through the process of creating your first Java program.
In order for this tutorial to work successfully, you will need
to have performed the following:
1.
Install Oracle JDeveloper 10g.
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On your operating system,
expand the <JDeveloper
home> folder node.
2.
Locate the jdev
folder and expand it.
3.
Open the bin
folder and look for the jdevw.exe
file
4.
Double click the
jdevw.exe file to launch JDeveloper 10g.
Note: On Windows platforms, you can also choose to run JDeveloper with
the console window (using jdev.exe
file located in the bin
directory), which displays internal diagnostic information.
5 .
The launch window displays. Note that on the first time
you start JDeveloper, you are prompted with a dialog asking you if you
want to migrate from a previous version of JDeveloper. Reply accordingly.
By default, the JDeveloper
IDE displays the Application Navigator pane on the
left side of the window. This is the main pane from which you access
the components of your application.
The structure of the Application Navigator pane is hierarchical and
supports workspaces, projects, images, .html files, and more.
2.
To create a workspace, right-click the Applications
node and select the
New option.
3.
The New Gallery displays. In the Categories
menu, select General and then, from the Items
list, select Workspace. Click OK.
Note:
The workspace is the highest level in the control
structure. It is a view of all the objects you currently need, while
you are working. A workspace keeps track of your projects and the environment
settings while you are developing your Java program.
Workspaces are stored in files with the extension
.jws. When you open JDeveloper,
the last workspace used is opened by default, so you can resume where
you left off.
When creating a workspace in JDeveloper you have
the choice of creating an Application Workspace or a Workspace. An application
workspace allows you to create a predefined type of environment, based
on prebuilt templates, depending on the type of application you want
to create (Web Application, Java Application,...) You can also create
your own application template that includes the architecture you need
for your development work.
4.
In the Create workspace dialog modify
the default workspace name Workspace1
to MyFirstApp.
Note that the Directory Name changes accordingly.
5.
Make sure that the Add a New Empty Project
check box is selected and click OK.
Note:
A JDeveloper project is an organization used to
logically group files that are related. A project keeps track of the
source files, packages, classes, images, and other elements that your
program may need. You can add multiple projects to your workspace to
easily access, modify, and reuse your source code.
Projects manage environment variables such as
the source and output paths used for compiling and running your program.
Projects also maintain compiler, run time, and debugging options so
you can customize the behavior of those tools per project.
In the Navigator pane, projects are displayed as the second level in
the hierarchy under the workspace.
6.
In the Create Project dialog, change
the default Project Name Project1
to MyProject,
then click OK.
Note that the Directory Name changes accordingly, and that the project
folder is a child of the Application folder.
7.
The Applications Navigator should look like this:
Note that all nodes in italics in the Navigator pane mean that these
elements are not yet saved.
8.
Click the Save All button to save your
work so far. Italic names now revert to normal font.
Note: Whenever you save your workspace, you are
prompted to save all of the current open files. Saving the workspace
does not save the open files, but only the current environment configuration.
To save the open and modified files, select the Save or Save All option
from the File menu.
Right click the MyProject node in the Applications
Navigator pane and select the New option from the context
menu.
2.
In the New Gallery, expand the General
node, select Simple Files in the Categories
list,and Java Class in the Items list.
Click OK.
3.
In the Create Java Class dialog, change
the default name Class1
to Hello.
Deselect the Generate Default Constructor check box
and select the Generate Main Method one, then click
OK.
Notice that the package name is the one that was specified when you
created the project. (You can also retrieve this in the Project Properties)
4.
The new class opens automatically in the Code Editor,
where you should remove the following
statement: Hello hello
= new Hello();
And start typing the word System
of the following Java statement: System.out.println("Hello
world");
Your code should look like this:
5.
Add a dot next to the word System (System.),
and notice that the code insight feature implemented in JDeveloper pops
up a list of the available related classes.
6.
Type o
to directly access classes starting with a "o" letter, or
scroll down the list, then select the out
option and click Enter.
7.
Add a dot next to the System.out statement (System.out.)
and JDeveloper displays a new list of the available related classes.
8.
Type p
to directly access methods starting with a "p" letter, or
scroll down the list, then select the println(String)
option and click Enter.
9.
Between the parentheses ()
enter the following characters: "Hello
World"
In the Applications Navigator,
right-click the Hello.java node and select the Make
option from the context menu.
2.
At the bottom of the JDeveloper screen a new window should
appear (the Log window). If the Log window does not display, use View
| Log to display it ( or Ctrl + Shift + L)
Notice that when using the Make option to compile your project, JDeveloper
saves all the files in your project.
3.
In the Applications Navigator, right-click
the Hello.java node and select Run
from the context menu.
4.
The Log window displays the Hello World message.
5.
Select the Hello.java node in the Applications
Navigator and open the structure pane View | Structure
( or Ctrl + Shift + S)
The Structure pane lists all the methods and fields for the currently
selected class. If you double-click an item in the Structure pane, JDeveloper
takes you to the definition of that item in the source code, displaying
and highlighting it in the Code Editor.
6.
Click the main node; you should see the
corresponding statement highlighted in the Source editor.
Code Editor Viewers are where most of the
work takes place; this is where you write code and design user interfaces.
Open the viewer by double-clicking the Hello.java node
in the Application Navigator pane.
2.
At the bottom of the Code Editor viewer, choose one of
the three tabs according to the task you intend to perform.
3.
Click the Class tab to have global view
of a class. Use the General tab to review the class
general properties.
4.
Click the Fields tab to define or review
field definitions in your class. Use it to add, modify, or delete fields
from your class definition. Each field displays its name, scope, and
type listed. To view all of a field's settings, select it and click
the Edit button to open the Field Settings dialog.
5.
Click the Methods tab and use it to
add, modify, or delete methods from your class definition. The list
of methods that your class defines is displayed here. Each method is
displayed with its primary settings listed. To view all of a method's
settings, select it and click the Edit button to open
the Method Settings dialog.
6.
Click the Event tab and use it to make
your class an event source for event sets you select or to register
your class's interest in events generated by other components.
Click on the Source tab to open the code
editor for the Hello.java class.
2.
Click in the margin to the left of the System.out.println("Hello
World"); statement to create a Break in your Java program.
(You can set as many breaks as you wish).
3.
Right click the Hello.java node and
select the Debug option from the context menu.
4.
The code execution proceeds up to the break point (the
red arrow in the left margin of the source code editor indicates where
the break is occuring). The log window opens and displays the debugging
trace.
5.
In the Log window, click the "Step into" icon
to execute the current statement.
In this tutorial, you learned how to get started with JDeveloper, as
a novice user. You created an application workspace, a project, and a Java class.
You also compiled and ran your class. You also saw how files are stored on your
operating system.
Related topics
To learn more about JDeveloper, refer to the JDeveloper OBE page for additional tutorials.
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to execute the current statement.
to finish the execution.
