JDeveloper 10g Java Environment

• There are also a number of free development environments that can be used to develop advanced Java programs (JDeveloper 10g is available in the business lab in the King Center)
  • JDeveloper available for free download from Oracle at: http://otn.oracle.com/software/products/jdev/content.html

• JDeveloper is a full-featured, integrated development environment for creating multi-tier Java applications. It enables you to develop, debug, and deploy Java client applications, dynamic HTML applications, web and application server components and database stored procedures based on industry-standard models.
• System Requirements:
  • Runs on Windows NT 4.0 or Windows 2000
  • CPU Speed: Pentium 233 MHz (or higher)
  • Memory: 128 MB RAM (256 recomended)
  • Hard Drive Space: 150 MB (minimum)
• You can use it to edit, compile & run code in the lab but I recommend you type your code in from scratch without using the code they automatically generates when you create a new file (The code it generates contains a lot of extra stuff that may not transfer well when you move from computer to computer).

Create a Simple Program

Follow these steps to create, compile, and run a simple Java program in JDeveloper:

1. Create a project. Choose File | New. In the "New" gallery, select the Project folder under Categories (on the left) and Empty Project under Items (on the right).
2. The "New Project" window will show you the default project location and file name. Note the location so you know where your project files are stored!!! Click OK. A new project node, with a name resembling Project1.jpr will appear in the Navigation pane (far left).
   
3. Create a Java file. Make sure your project node is selected, and choose File | New. The "New" Gallery opens again. This time select the Objects folder and double-click the Class icon. In the Class Wizard dialog that opens:
   
   1. Replace the default class name with "HelloWorld".
      
   2. Click OK.

   A new file node, named HelloWorld.java will appear under your project node.

4. Edit the file. Double-click the file node to open the file. Edit the file, adding this method to the definition of the HelloWorld class.

    public static void main(String[] args) {
          System.out.println("Hello, World!");
    }

   The complete code will look like this:

   package project1;
   
   public class HelloWorld {
   
      public HelloWorld() {
      }
   
      public static void main(String[] args) {
          System.out.println("Hello, World!");
      }
   }

5. Build the project. Choose Project | MakeProject. A message will appear, reporting success or failure, in the Status line at the bottom of the JDeveloper window. If there are errors they will be listed in the Message View pane, under the Compiler tab.
   
6. Run the project. When the project has been successfully built, Choose Run | Run. Your message will be printed in the Message View pane, under the HelloWorld tab.
   

Console Applications

• JDeveloper has some challenges for the simple applications we are using: It prints output to the message pane just fine but will not do input that way.   (It thinks there is input already there...).
• You need to tell it to indicate you want to allow program input by choosing Project | Default Project Settings and then expand the Configurations | Development | Runner trees and choose  options tab.  Then check "Allow Program Input"
   

Adding Files to JDeveloper

Now your source files will be conveniently grouped by package in the JDeveloper navigator. In addition, the navigator will keep track of files you add and remove from the file system automatically.