Hello World in the Forte IDE

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Hello World in the Forte IDE

• An introduction to the Forte IDE (integrated
  development environment) writing the classic
  Hello World program in Java

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Create a folder for your projects

• One way is to use Windows Explorer (WE)
• On the left-hand-side of WE, click on the
  location where the folder is to be created
• On the right-hand-side of WE, right click in the
  open area and choose from the menu New and then
  Folder

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Create a New Folder
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Rename the FolderRight click on the Folder and
choose Rename, then type the name, press ENTER
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Start ForteStart/Programs/Forte for Java CE/
Forte for Java CE
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Start Forte (Alternative)Double click on the
runidew icon found in forte4j/bin
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Close Tip Window(if it appears)
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Forte at Startup
Main window menus and toolbars
Explorer window
Properties window
Desktop showing through
Filesystems, see next slide
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Right click on Filesystems (circled on previous
slide) in the Explorer Window
Choose Mount Directory from the menu
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The Mount Directory Dialog Box
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Use the Mount Directory Look in drop-down box
to choose a drive and the region below to select
a folder
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Alternative Choose File then Mount Filesystem on
the Main Window menu to bring up the dialog box
shown below
Type the folders path or Browse for it , then
click OK
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To remove any previous Filesystem, right click on
it and choose Unmount Filesystem
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Java Packages

• In order to facilitate portability (moving a
  program from computer to computer), Java breaks
  references to a files (complete/full) path (its
  location) into two parts
• An external part (known as the CLASSPATH) which
  will change as the program is moved around
  (mounted)
• An internal part which will not change as the
  program is moved around (package.class)
• The dividing line is a folder known as a package

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To create a package for your project, right click
on the particular filesystem and choose New
Package
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Name the packageNOTE Javas convention is that
only class names are capitalized, Java is case
sensitive hello ? Hello
small letter
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Make your package part of current project (click
Yes)
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Right click on package folder, select
New/Classes/Main
This template (Main) has a method (main) needed
to start execution
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Name your classJava convention is that class
name are capitalized
Capital letter
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Finish

• For the simple Hello World project in this
  example, one might as well click Finish at this
  stage
• However, we will step through a series of dialog
  boxes that may prove useful when writing future
  projects

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Dialog Box 1
Click Next
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Dialog Box 2
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Dialog box 3
Most classes have fields (or properties) and we
could begin to list them here
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Dialog box 4
Classes also have methods which could be added
here
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Make class part of current project
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The Source Editor Window appears.This is where
we will type the code.Some code is already
provided.
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Source editor
comments
package
Beginning of class
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Some features

• Comment anything between / and / is a
  comment they are ignored by the computer and
  are there for the sake of the programmer or
  anyone else reading the code
• The Hello class begins with the line
• public class Hello extends Object
• public, class and extends are keywords or
  reserved words, which is why they are in a
  different color

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Hello World

• For this simple program, we will add just one
  line to what was supplied by the IDE
• That line is
• System.out.println(Hello World.)
• It belongs inside the curly brackets associated
  with the main method
• Curly brackets set off a unit of coding known
  as a block

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The main method
Constructor, not needed for this program
the main method
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Indenting scheme convention

• Free-formatting white space (spaces, tabs,
  returns) are usually ignored by the computer when
  interpreting Java
• To make the program more readable (not to the
  computer but to the human beings), certain
  conventions are followed
• One convention is to place the curly brackets on
  a line by themselves and have them vertically
  aligned (indented the same amount) and then
  anything within the curly brackets is indented
  further

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Start typing the lineAfter typing the period,
notice the pop-up menus
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Java is case-sensitive

• Java is case-sensitive
• In the one line, System (a class) must be
  capitalized, out (an object) must not be
  capitalized
• The pop-up menus provide the properties and
  methods associated with a class or object
• If they do not pop up, it is a good indication
  that there is a typo

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Hello World Program
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Right click on Hello (the class not the package)
and choose Compile
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The Output Window appears if there are errors
In this case there is a missing semicolon
Error reported on line 28 although line with
missing semicolon is line 27 (free formatting)
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Edit (add semicolon), Compile again, then
Execute Right click on class and choose Execute
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Output Window
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Execution Shortcut
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Build and Compile Shortcuts
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Windows Explorer