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Dynamically adding content to JScrollPane in intelliJ GUI form [duplicate]

I faced this new thing today, and I didn't know why. When I want to show something in panel for example, I just add it to panel; but why I cannot add a table to scroll pane directly, and why I have to call the setviewportview() method? What does add() method do and what does setViewProtView() do?

Basically, you should not use JScrollPane#add.
JScrollPane has a single component already attached to it, a JViewport, this is what the JScrollPane uses to display any component added to the view port.
setViewportView is a convenience method for for JScrollPane#getViewport#setView
The basic concept comes down to the fact that from the scroll panes point of view, it will only show a single component, so add doesn't actually make any sense for it. The method is a consequence of extending from JComponent -> Container

Add (multiple) forms to ScrollPane after clicking button in java

So I have a program that at the start only contains an 'add movie' button at the bottom of the frame.
Above it I inserted a scrollpane.
I also made a seperate JPanel form which contains labels and textfields where you have to input the data of the movie.
Every time I click the 'add'-button I want a form to appear inside the scrollpane (next to previously made forms).
So I figured I just needed to do this:
private void AddMovieButtonActionPerformed(java.awt.event.ActionEvent evt) {
MovieForm movie = new MovieForm();
MovieScrollPane.add(movie);
}
But nothing new appears.
I tried validate() and repaint(), but so far these don't seem to work.
I made the interface in Eclipse btw.
Anyone who can help me?
Thanks anyway!

MovieScrollPane.add(movie);
Don't add components directly to the scrollpane. Normally a JPanel is added the the viewport of the scrollpane.
Then, whenever you add a component to a visible GUI the basic code is:
panel.add(...);
panel.revalidate();
panel.repaint();
This makes sure the layout manager is invoked to the preferred size can be recalculated.
Also, follow Java naming conventions. Variable names should NOT start with an upper case characters.

Having a JButton open a new JPanel

I am creating a program which currently has 3 classes. These include the JFrame class in addition to the 2 other JPanel classes. Does anyone know how I can make a JButton in one JPanel class remove that specific JPanel and have the JFrame add in a new JPanel (from another class)?
For example, let's say that the JFrame class is called frame, and the two JPanel classes are called panel1 and panel2. If a button is clicked in panel1, how do you tell the frame to remove panel1 and add panel2?

Well it depends from what you mean with the "remove" word.
A good approach will be to use the MigLayout using the hidemode property. The initial state of your form will contain both panels in the JFrame ,but the second panel will be invisible.
When you press the button of the first JPanel, it will set the visibility of this panel to false, and the visibility of the second panel to true.
On the other hand, if you want to remove completely from the frame the first panel, give a name to it using the method panel.setName(panelsName), and then retrieve every sub-component of the JFrame and put them in a collection.
Then iterate through this collection, and check for the name of every component.
If component.getName().equals(panelsName) then use the frame.remove(component) method to get rid of it. After that, it is possible that you have to call validate and repaint in your frame, though I am not sure if it is necessary. Just try it out;)

JPanel data getting changed on mouse click

I am using three JButtons in my swing application. When I click on each button, the corresponding data (formatted in JTable with JScrollPane) will display on JPanel.
Problem: when I resize the JFrame, the JPanel is replacing with default button (the button which i was clicked first) information instead of current JButton information.
My sample code:
jbutton1.addActionListener(this);
jbutton2.addActionListener(this);
public void actioPerformed(ActionEvent e){
if(e.getActionCommand.equals("button1"))
JPanel.add(table1);
}
if(e.getActionCommand.equals("button2"))
JPanel.add(table1);
}.......

Resizing the JPanel will not suddenly replace components or add other components to the panel.
My best guess (and it is a guess due to the limited information in the question) is that none of your buttons actually work and just show the wrong information.
The code you posted only contains an add without any revalidation of the layout. Consult the javadoc of the Container#add method. When you resize, the layout gets revalidated and you see what is actually contained in the JPanel.
Possible solutions:
Call invalidate and repaint on your panel as well in your ActionListener
Use a CardLayout to switch between the different components
I personally prefer the CardLayout option, but it might depend a bit on the situation.
Note that in the code you posted, you add table1 for both buttons. Might be a copy-paste problem, or a problem with your actual code.

I was unable express problem clearly.Sorry for your inconvenience.
JPanel.removeAll() method has fixed my problem.
I added this method before adding any new component to JPanel. That fixes JPanel unexpected behavior.

how to start, developing swing based application with few panels with next buttons for each

I'm new to java.I'm creating a swing based UI. I've created 2 frames, each one in separate .java file inside same package.
These two frames represents 2 screens (panels) of application. When Next button in first frame is clicked, it should move to second frame.
When I checked, these two classes are having main method, I think it should be correct way for creating applications. there should be only one main method.
When Next is clicked, I'm trying to make setVisible(false) for main panel of first frame and setVisible(true) for main panel of second frame. But this cannot be done, since the panels within a class are private. Any resolution for the above problem?
As I'm beginner, Can somebody suggest me in how to start up with these kind of applications? what are the guidelines that need to be followed? And please help me in finding documentation related to starting up with the development of such applications.
After going through the answers, My comments are:
I used the following code to go to next panel from first panel, but didn't worked.
private void gotoNextPanel(){
// jPanelFirstScreen.setVisible(false);
JPanelSecondScreen jpanelSecondScreen= new JPanelSecondScreen();
jpanelSecondScreen.setVisible(true);
UpgradeUtilityGUI upgradeUtilityGUI = new UpgradeUtilityGUI();
upgradeUtilityGUI.removeAll();
validate();
repaint();
// upgradeUtilityGUI.add(jpanelSecondScreen);
upgradeUtilityGUI.getContentPane().add(jpanelSecondScreen, "card2");
jpanelSecondScreen.setVisible(true);
validate();
repaint();
}
I'm using netbeans, and 've added two panels to the cardlayout of frame. And when I use the above code to change panels, Nothing is happening, the first panel is still appearing. Can somebody tell me, how to write code for moving from one panel to another when both the panels 've been added to cardlayout of jFrame ?

Use a CardLayout, as shown here (and one frame) as mentioned by others.
When Next is clicked, I'm trying to make setVisible(false) for main panel of first frame and setVisible(true) for main panel of second frame. But this cannot be done, since the panels within a class are private. Any resolution for the above problem?
Make the panels public access level and they will be available from other packages.
One problem in that code snippet is implied by the line:
UpgradeUtilityGUI upgradeUtilityGUI = new UpgradeUtilityGUI();
It goes out of scope before ever being added to a container. Also, their should be no need to remove anything when adding a new card to the layout, and no need to call repaint().

If your application is as simple as having only two panels you shouldn't create two JFrames. You should create a JFrame with two JPanel each of them contains the neccessary information for you. If you are ready with your first panel you can call setVisible(false) on it, and call setVisible(true) on the 2nd frame. It is the one of the most easy-to-understand solution.
But, it only depends on you if it is good for you or you would like to use some more detailed solution.

Don't use two or more JFrames, nor with separated and compiled Jar files, this is road to the hell, better would be look at CardLayout,

What you should do is have a single JFrame for the application, then you add and remove JPanels as you want to move between screens.
Each of your JPanels should basically have the following...
1. A JButton called "Next"
2. A ButtonListener for each button, that tells the JFrame to load panel2, panel3, etc.
As part of the ButtonListener, you basically just want to call something like JFrame.removeAll() to remove the existing panel, then JFrame.add(JPanel) to add the next panel.
By having 1 JFrame, you also only have 1 main() method.