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摘要: This tutorial provides a very simple and quick introduction to the NetBeans IDE workflow by walking you through the creation of a simple "Hello World" Java console application. Once you are done with this tutorial, you will have a general knowledge of how to create, build, and run applications in the IDE
To write your first program, you'll need to have the following software installed on your system:
To create an IDE project:
Hello World App
.helloworldapp.HelloWorldApp
.The project is created and opened in the IDE. You should see the following components:
HelloWorldApp
open.
Because you have left the Create Main Class checkbox selected in the New Project wizard, the IDE has created a skeleton class for you. You can add the "Hello World!" message to the skeleton code by replacing the line:
// TODO code application logic herewith the line:
System.out.println("Hello World!");
Save the change by choosing File > Save.
The file should look something like the following:
/* * HelloWorldApp.java * * Created on September 15, 2006, 5:27 PM * * To change this template, choose Tools > Template Manager * and open the template in the editor. */ package helloworldapp; /** * The HelloWorldApp class implements an application that * simply displays "Hello World!" to the standard output. */ public class HelloWorldApp { /** Creates a new instance of HelloWorldApp */ public HelloWorldApp() { } /** * @param args the command line arguments */ public static void main(String[] args) { //Display "Hello World!" System.out.println("Hello World!"); } }
To compile your source file, choose Build > Build Main Project from the IDE's main menu.
The Output window opens and displays output similar to what you see in the following figure.
If the build output concludes with the statement
BUILD SUCCESSFUL
, congratulations! You have
successfully compiled your program!
If the build output concludes with the statement
BUILD FAILED
, you probably have a syntax error
in your code. Errors are reported in the Output window as hyper-linked text.
You double-click such a hyper-link to navigate to the source of an error. You can
then fix the error and once again choose Build > Build Main Project.
When you build the project, the bytecode file HelloWorldApp.class
is generated.
You can see where the new file is generated by opening the
Files window and expanding the Hello World App/build/classes/helloworldapp
node
as shown in the following figure.
Now that you have built the project, you can run your program.
From the IDE's menu bar, choose Run > Run Main Project.
The next figure shows what you should now see.
Congratulations! Your program works!
You now know how to accomplish some of the most common programming tasks in the IDE.
For a broader introduction to useful IDE features that are generally applicable to all kinds of application development, see Introduction to Developing General Java Applications.
To find information specific to the kind of applications your are developing, use the NetBeans IDE learning trail for that type of application. Each learning trail contains a series of tutorials and guides that range in scope from basic to advanced. The following learning trails are available: