如何在 Netbeans 中运行 Java Swing？

Question

I've been trying to run gui in netbeans using java swing but it won't run at all. All the projects that I execcute that uses jframe does not run. Any tips on how to fix this thing? This is how it looks like:

Answer 1

I got this to run with no problems using NetBeans IDE 8.2. Let's start from the beginning.

Delete your current OfficeManagementSystem project from your IDE and local drive system. Select the OfficeManagementSystem project located within your IDE Project pane located on the left side of the IDE. Right-click on it and select the Delete popup menu item. A Delete Project dialog is displayed. Check-mark the Also delete sources under..... checkbox then select the Yes button.

Close NetBeans!

To make sure all is gone, open your file browser (in Windows10 this is named File Explorer [ win key + E ]) and navigate to your NetBeans Projects folder. Default location in Windows is C:\Users\{yourAccountName}\Documents\NetBeansProjects\ . Make sure that OfficeManagementSystem project folder is deleted.

With your web browser, go to the Source Code Web Page and select the Code button:

Then from the dropdown menu select Download ZIP :

A Save File dialog will appear possibly similar to this:

Select the Save File option then select the OK button. Choose a location to save the ZIP file and remember it.

Navigate to you downloaded file named HospitalManagementSystemusingJAVASwing-master.zip and Un-Zip it with your favorite decompression software like WinRar or 7Zip . Have it unzip into its own folder .

Navigate to and open the the folder created by your decompression software, it should have been named HospitalManagementSystemusingJAVASwing-master . If done properly you should have yet another folder (a sub-folder) also named HospitalManagementSystemusingJAVASwing-master . Rename this folder to HospitalManagementSystem by right-clicking on the folder and selecting Rename from the popup menu. Delete the unnecessary text within the name then hit your ENTER key.

After Renaming the folder, once again right-click on it and select Copy from the popup menu.

As described earlier, navigate to you NetBeansProjects directory (folder) and double-click on it. Paste the new HospitalManagementSystem folder into the NetBeansProjects folder. This project will now be added to the NetBeans Projects List.

Start NetBeans!

Once NetBeans has completely started, from the menu bar select the File ➞ Open Project... menu item. The Open Project dialog will be displayed. Scroll down the left pane of this dialog until you see HospitalManagementSystem and select it. Now hit the Open Project button. This project will load into the NetBeans IDE Projects pane located on the left side of your IDE under the name of: OfficeManagementSystem . Why this person changed the project name at this point is beyond me but to each their own.

Expand the project and its active package (officemanagementsystem) so as to expose all the classes involved. You should see the following listed:

LoginPage.java               // The first Form we want displayed.
MenuPage.java                // The Menu page (once login is achieved).
Module1.java                 // Should really be named PatientPage
Module2.java                 // Should really be named DoctorAvailabilityPage.
OfficeManagementSystem.java  // The application start-up class.

This application still will not run since it contains nothing within the main() method of the start-up class ( OfficeManagementSystem ). Open this class into the IDE Editor by double-clicking on it.

Expand the main() method code block and add this code line into it:

new LoginPage().setVisible(true);

Run the application! The first Window displayed will be the Login Page. Username is: admin and the password is: admin . (change in code if you like). And away you go. :)

Answer 2

All java applications need a static main method as a bootstrap. It should look something like the following:

public static void main(String[] args) { YourJFrameClass frame = new YourJFrameClass(); }

That should get you started.

Answer 3

The easiest method is to press Shift+F11 (Clean and Build Project), then hit F6 to run it.

It refreshes Netbeans appropriately and finds your main without all the manual labor; and if you have multiple mains, it will give you the option to select the correct one.

Answer 4

Check if your JFrame Class has this method:

public static void main(String args[]) {
   java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new YOURFORMNAME().setVisible(true);
            }
   });
}

The setVisibile(true) allows the form to be visible to the user. The main method is used to define the entry point for the application therefore this method is needed to run the JFrame