Getting that important First java code example working. Standby for the relief!

Getting your first program running

Applet, Application, MIDlet, Servlet, JSP cit.KarlGrabe.com updated 27 Jan 2014

Lab Excercises to do but first get started with your first program:

Links on this page:

First Android Phone App
First Applet - BlueJ, Eclipse, NetBeans
First Application - BlueJ, Eclipse, NetBeans (also GUI application shell)
First Servlet - (netbeans) follow this tutorial (steps: 1 2 3)
First Servlet (Eclipse) tutorial (local copy) or Create 'HelloJSPservlet" web Application
Spring Application (netbeans) import notes Calculator project from here in sources folder.
Spring Application (Eclipse) - Setup, 'Hello World' tutorial (also in sources folder)
Servlet & App Engine (eclipse) tutorial (7z download: intro, sdk, 1 2 3 4 5 deploy) HowToDemo It runs in your browser at http://localhost:8888/

Other Links:

Java APIs: JSE JME MIDP JEE All
Code Exampes from the book.

How to get your first Applet running with BlueJ

Start BlueJ

Close previous projects
Project | New Project
Click New Class button
Name class. myApplet
Double click on the myApplet rectangle that was just created
Delete all of the code and replace with the following:

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

public class myApplet extends Applet {
public void paint (Graphics g) {
g.drawString ("first CIT java applet", 10,10);
}
}
Check that the class name "myApplet" matches the name you created in step 4. If not change the class name in the code you pasted in step 6.
Click Compile button to check for any errors. Close window.
Right-Click on myApplet rectange and select Run Applet.
Select Run Applet in Applet Viewer
You should see an applet view window open and have the text "first CIT java applet" displayed.

How to get your first Application running with BlueJ

Start BlueJ

Close previous projects
Project | New Project
Click New Class button
Name class e.g. myAplication
Double click on the myApplication rectangle that was just created
Code your application or delete everything and paste in an example from the noted.
Make sure the class name and file name match (class must be called myApplication)
Click Compile button to check for any errors. Close window.
Right-Click on myApplicatin rectange and select void main ( )
Click OK at the next dialog (no need to enter anything)
Your application should run, if you can't see it check it is not hidden behind some other windows.

How to get your first Applet running with Eclipse

File - New - Project...
Java project - Next
Enter Project Name
Finish

New - Class
Enter class name in text field labellled Name:
Do not check public static void main ( )
Finish

Add this to the top of the file (before the class definition
import java.awt.*;
import java.applet.*;

Now add a paint method in the class body and extend class from Applet:
public class myApplet2Class extends Applet {
public void paint (Graphics g){
g.drawString("hello there", 10, 10);
}
}

Click green Run and select Run as
Select Java Applet -

How to get your first Application running with Eclipse

File - New - Project...
Java project - Next
Enter Project Name
Finish

Now add a class file and code a main method
New - Class
Enter class name in text field labellled Name:
Create main mehtod should be checked
Finish
In main method enter code:
System.out.println("hello there");

click green run button
Select Java Application, right click select new
Click Run
Save & Launch dialog - click OK

How to get your first Applet running using NetBeans 7

Create a new Project

Close all open projects
File | New Project
Choose Project:
- in Java folder select Java Applicatoin folder (even though it's an applet we want)
Next

In the Name and Location dialog:

Name your project (this will be the name of the project folder) e.g. HelloCITapplet
Browse to the location where you would like your project file kept
Uncheck main class <-- NB this not default behaviour so you must change it
Check Save as main project
Finish

Now Create an Applet class

File | New File
Java folder | Applet (w'ell use JApplet later)
Next

Name and Location

Name the class e.g. myApplet (this will create a java source file called myApplet.java)
leave package blank (normally not recommended but easier for trying examples)
Finish

To run

in the projects pane find your source file e.g. myApplet.java
Right clidk on it and select Run File
It should compile/run and the Applet Viewer window opens and showing your program running (it doesn't do anything)

Some code to try

Paste in the following code (erasing the existing code) and re-run your applet:

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

public class myApplet extends Applet {
public void paint (Graphics g) {
g.drawString ("first CIT java applet", 10,10);
}
}

you can now add more lines after g.drawStrin... above - look up the Graphics class in the API

How to get your first Application running using NetBeans 7

Create a new Project

Close all open projects
File | New Project
Choose Project:
- Java folder and select Java Application
Next

In the Name and Location dialog:

Name your project (this will be the name of the project folder) e.g. HelloCITapplication
Browse to the location where you would like your project file kept
decete the text opposite Create Main Class
Check Save as main project
Check main class
Finish

Create an application class

File | New File...
Java folder | Java Main Class
Next
Name the class e.g. myApplication
finish

To run

Click on the green 'play' button
if asked - choose your class e.g. myApplication

Some code to try

Paste in the following code in the main method and re-run

System.out.println ("hello");

Run again - "hello" will appear in the Output window

How to get your a GUI Application running using NetBeans 7

File | New Project
Java folder and Java Desktop Application
Next

Name and Location

Name the Project
Select Basic Application
uncheck Use Deditcated...
Check Set as Main Project
Finish
Now Click Play

How to get your first MIDlet (moble phone application) running using NetBeans 5.5/6

Create a new Project

File | New Project
Choose Project:
- Select the Mobile folder and then select MIDlet (Mobile Application)
Next

In the Name and Location dialog:

Name your project (this will be the name of the project folder) e.g. HelloCITproject
Browse to the location where you would like your project file kept
Check Save as main project
Uncheck Create HelloMidlet (otherwise you can't edit all of the code)
Next

Select Default (Mobile) platform:

Default ColorPhone
CLDC 1.1 (if you want floating point support)
MIDP 2.0 or higher
Next

More Configurations

Uncheck Everything
Finish

Create a source MIDlet java file:

File | New File
MIDP Folder (= Mobile Information Device Profile)
MIDlet (= Mobile Information Device, let = small)
Next

Name and Location Dialog

Name your midlet e.g. HelloCIT
Class can be the same e.g. HelloCIT
Leave package blank
Finish

You should see the HelloCIT default code, but it does nothing so...

Paste in your java MIDlet code: e.g. copy this HelloCIT example source code and paste over the default code
Make sure there is no package statement at the top of your code
In your source code change the name of the class and constructor if needed to match the name of the java file. In this case the class is HelloCIT (note capitals) and the constructor should be public HelloCIT ( ).

Run the MIDlet in the phone emulator

Click the green leftmost Run button - you Midlet should compile, and open the phone emulator.
No, you can't make free phone calls - duuhh.
Select the MIDlet listed on the phone emulator and launch it.
You should see the text Hello, "Hello CIT" displayed. The 'Hello' is the label associated with the StringItem, the 'Hello CIT' is the contents of that StringItem object.

Make some changes and run it again

Close the emulator first
find the line that prints out "Hello CIT", change it and re-run your program.
it's this line:
- helloStringItem = new StringItem("Hello", ", Hello CIT!");

How to get a Netbeans MIDlet up and running on a YOUR (real) phone

You need to locate the compiled .JAR file for example here is a typical location:
- E:\myDocuments\NB Projects\HelloCITproject\dist
Look for HelloCITproject.jar
Transfer this file to your phone from your PC/Laptop via bloothooth, InfraRed or a cable. Alternative you could upload it to a web server and then create a WML file to link to it. Browse with your phone to the WML file and it possbile to download and install it on your phone.
Here's an exampl of a WML file with some MIDlets to try. Browse to it with your phone's wap browser:
- http://cit.karlgrabe.com/mobile/index.wml
- (cit.karlgrabe.com/m will take you there from a phone or PC)
Some phones may also require the HelloCITproject.jad file, it in the same location as the JAR file. BTW - You can double click the JAD file and the NetBeans phone emulator shoudl run it.

How to get your first MIDlet (moble phone application) running using Eclipse

If needed install Java Wireless Toolkit (http://java.sun.com/javame/downloads/index.jsp)
If needed install eclipsse ME (http://www.eclipseme.org/)

File | New | New | Project...

J2me | J2ME MIDlet Suite
Next
Enter Project Name
Next
Next
Finish

File | New | Other

J2ME | J2ME Midlet
Next
Name your class
Next
Finish

Paste or write your source code

Right-Click on source

Run As | Emulated J2ME MIDlet

Modify Code

re-run -> click on green button, select from the drop down list

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