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Multiple frames in jFrame?

I'm currently learning how to create a program with Java and jFrame. One problem I have is that I cant create new "forms" (how they are called in visualbasic) or windows. I'm using "Java-Editor", a usually very simple editor for things like that. Can anyone help me create a new form?
Thanks for your help in advance,
Till

From JFrame I assume that you are using Swing, and that you want multiple windows for your application. Your app should only use one JFrame object, if you need more windows (usually these are popup messages) then you can use dialogs. The class for this is JOptionPane.
Here is an example:
JOptionPane.showMessageDialog(null,"title","content",JOptionPane.INFORMATION_DIALOG);
As you can see you can control the title and the content displayed. Note that for the content parameter you can pass any JPanel object, so you dialog can display a lot of things.
The first parameter is the owner of the dialog, now I just set it to null, which means the dialog will have no owner. If you store a reference to your JFrame object then you can pass this for example and the dialog will always appear above your main window.
The last parameter is just for the general styling of the dialog. You can set it to other message types like ERROR MESSAGE too.
More info about displaying simple dialogs: https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html

Multiple jAppletForm in a Java applet

I've created a new Java project without main class in NetBeans and then I've added a jApplet Form (let's call it MainWindow.java) to my project package. After that, I've added few other jApplet Forms that represent different "pages" of my applet application to my package using the GUI builder of NetBeans.
When I run my applet, I can see the MainWindow form with some buttons, label, etc. on the AppletViewer just fine.
Now, I want to make an event when one of my buttons on my MainWindow is pressed, to show another jApplet Form that I've created earlier and show that form instead of the MainWindow form. I'm trying to create a simple navigation system in my jApplet, and I don't know how to make it efficiently!
Can anyone help me with the code that I should write in the MouseClicked event of my button to make it show another form?

Basically, you can't (or shouldn't) design applets like this. There is no effective means to switch from one applet to another.
Instead, you should create one master applet and using something like CardLayout, design separate forms using one thing like JPanel
You'd then able to switch the forms using the CardLayout manager as needed

combine multiple windows to a single window

I am developing an application which have the following windows
If the information entered in the windows are correct than only the user will be prompted with the windows in the above sequence. Now the customer has demanded me with this user interface.
Now I have to add all these windows in the last window format, with the specification's as the user will be allowed in the 2nd portion of the last image if the first information entered is correct.And the user when launches this app see the last image and can change the values as any time in the respective portions of the last window.
I have coded it in Swing Java.I am new to Java. I am working in Netbeans 7.1.2 I have three files as
1)Login.java
-containing my LoginDemo class which have main and form object of extended Jframe class
-Login class extending J frame and implementing action listener(this class creates an J frame of next file Enter the information.
2)Algorithm.java
creates new J frame object of next file if information is correct.
3)TravellingSalesmanProblem.java
gives the output as shown in Optimal Travel Route window.
I am accessing the information using REST call to a website.
So can anyone help me in this?

This will depend on how you structured you code. If you simply placed components directly onto the the windows/frames themselves, then you might be in for some work.
Alternatively, if you used panels, which you then placed onto windows, this might save you some time.
Anyway. Assuming you only have windows.
for each window do
myLastWindow.add(window.getContentPane());
This is pretty simple, but you'll also need to know the layout you want. I'd suggest something like GridLayout or VerticalLayout from the SwingX project.

Making a hello world app in a Form in Intellij

I'm trying to make a hello world form in Intellij. I've created the form, but the question now is what code to make in main() to make the form run and show up?
PS: all the tutorials around seem to only focus on "how to do forms on intellij" not in "how to actually make it run, then".
Thanks

Go to the class with the same name as the form.
Press the keyboard shortcut for "Generate". It's Ctrl+N on Mac OS X, Alt+Ins on Windows. Alternatively, from the menu, select menu Code → Generate.
Select "Form main()".
Now the main method is written and inserted for you. It will look something like this:
public static void main(String[] args) {
JFrame frame = new JFrame("MyForm");
frame.setContentPane(new MyForm().mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}

I just did my first Intellij Swing App.
Steve McLeod has the right instructions, however, when I tried to generate the main method using Alt+Insert => Generate main, I received an error message about one of my panels not being bound. So I clicked on the gui designer page (.form), selected my top panel, and gave it a name.
Everything else was named for me, but for some reason, the panel name was blank. Once I did that, I was able to switch over to the form .java class, press "Alt+Insert" and generate a constructor (not required, but needed).
From there, I followed Steve's advice to generate a main method. One thing that threw me off was the expectation that my Intellij generated .java class would extend or implement something swing related - it didn't. Swing only shows up in the Intellij generated main method (besides the private variables).

Check this tut while it is realy step-by-step:
JetBrains JavaFX HelloWorld

jTabbedPane opens different tab on loading

First of all I'm using netbeans as my IDE and I don't know if this is causing it. When I run my program (even if I have build it and run the .jar) I think it selects the tab that was previously selected (before quiting). So if for example I close the app with the third tab selected, it starts up with that selected again. Is there a known solution for this? The selectedIndex property on the jTabbedPane is set to 0. Shouldn't this property be the default onLoad value?
Thx in advance, Jimmy
PS. BTW for some reason it didn't submit my question in Opera (?)

tabbedPaneName.setSelectedIndex(0);
just put that line in the place where the tabbed pane would be loaded
if a button actuion will load the tabbed pane then put the line there
but change tabbedPaneName to YOUR tabbed pane name.

Same problem here with Netbeans 6.8 and JTabbedPane. Neither setSelectedIndex() nor setSelectedComponent() makes a difference. The getSelectedIndex() returns the value previously set, but the pane is not selected correctly.
The reason for this is that the SingleFrameApplication saves it's state and restores the saved state on the next restart. This is done in the code generated by the GUI builder.
You could see that startup() and configureWindow() methods of the SingleFrameApplication are overridden.
Workarounds:
You could override the shutdown() method as well, then modifications to the configuration will not be saved. Note that the original will still be restored, so ensure that the required configuration is saved.
Modifying the startup() method also helps:
MyView myView = new MyView(this);
myView.getFrame().setVisible(true);
myView.getFrame().pack();

The only way it can be set to an index other than zero is if the Java code contains:
tabbedPane.setSelectedIndex(...);
So search the source code for that line and fix it.

Besides using JTabbedPane.setSelectedIndex(), it's also possible to select a tab by calling JTabbedPane.setSelectedComponent(). Have you searched the code for setSelectedComponent() as well?

I had the same problem and found an easy workaround.
In netbean's GUI-builder I set my tabbedpane to not enabled. Later in my program I checked if it was not enabled and in that case called MyTabbedPane.setEnabled(true); and MyTabbedPane.setSelectedIndex(0);

Same problem. Had to go back to NetBeans 7.0.1 to update a JSR 296 application and Java 7 runs it differently than previous versions did so the last tab created was always the one that had focus. Couldn't get anything to change that in the constructor, but finally found just wrapping the same call (setSelectedIndex()) in a call to invokeLater() solves it.
SwingUtilities.invokeLater(
new Runnable() {
public void run() {
tabMain.setSelectedIndex(0);
}
}
);