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Java Gui won't display panels and components

im trying to make a program to add an admin to a ms access database
I researched many times, figured out all the components need to be in a panel, and only the same type of J stuff can be in a panel, so i made many panels and combined them in a big panel
//frame details
final int FRAME_WIDTH = 1000;
final int FRAME_HEIGHT = 1000;
JFrame aFrame = new JFrame("Add admin");
aFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
aFrame.setVisible(true);
aFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//panel declaration
JPanel BigPanel = new JPanel();
JPanel adminnameenter = new JPanel();
JPanel typeadminname = new JPanel();
JPanel adminlastnameenter = new JPanel();
JPanel typeadminlastname = new JPanel();
JPanel buttonaddadmin = new JPanel();
//labels, textfields, and buttons
JLabel newAdminName = new JLabel("Enter admin name");
JTextField adminName = new JTextField(7);
JLabel newadminlastname = new JLabel("Enter admin last name");
JTextField adminlastname = new JTextField(7);
JButton addadmin = new JButton("Add Admin");
//add things to panel
adminnameenter.add(newAdminName);
typeadminname.add(adminName);
adminlastnameenter.add(newadminlastname);
typeadminlastname.add(adminlastname);
buttonaddadmin.add(addadmin);
//add things to big jPanel
BigPanel.add(adminnameenter);
BigPanel.add(typeadminname);
BigPanel.add(adminlastnameenter);
BigPanel.add(typeadminlastname);
BigPanel.add(buttonaddadmin);
//add things to frame
aFrame.add(BigPanel);
the only thing that popped up was a frame that said add admin

Add this code to the end of your function:
aFrame.setVisible(false);
aFrame.setVisible(true);
Or alternatively put
aFrame.setVisible(true);
at the end of your function instead of the beginning.
And all the components will appear. This is because whenever you change anything to your JFrame, it will only change on the user side once it is told to resize or refresh the frame. Also you don't need to put every single component in it's own JPanel, you can simply insert them directly in your BigPanel (small nitpick, but the b in bigPanel, shouldn't be capitalized, seeing as variables start with non-capitalized letters).
Also look into LayoutManagers, they will probably be useful for your application.
https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

Grid layout not working?

I am trying to make a 2x2 grid layout that has a JLabel on the top left, and three buttons on the other three spaces. When I do this, I get the unexpected result of one big button (filling up the entire JDialog) that says "Do you want to push me". I don't know why this result shows up, please help, Thanks!
public void sinceyoupressedthecoolbutton() {
JDialog replacementwindow = new JDialog(); //Like a window
JButton best = new JButton("best");
JButton first = new JButton("FIRST");
JButton second = new JButton("Second");
replacementwindow.setLayout(new GridLayout(2,3,0,0)); //Row, column, distance horizontally, distance vertical
JPanel panel = new JPanel();
replacementwindow.add(panel); //adding the JPanel itself
replacementwindow.add(first);
replacementwindow.add(second);
replacementwindow.add(best);
replacementwindow.setSize(500, 500);
replacementwindow.setTitle("NEW WINDOW!");
replacementwindow.setVisible(true);
}

It's because you set the layout of your JButton, and not of your JDialog
Change
label.setLayout(new GridLayout(2,2,0,0));
to
YES.setLayout(new GridLayout(2,2,0,0));
Also, your variable called label is a JButton, you probably want to change that.

Don't add components to a button. You add components to a panel.
So the basic code should be:
JDialog dialog = new JDialog(...);
JPanel panel = new JPanel( new GridLayout(...) );
panel.add(label);
panel.add(button1);
...
dialog.add(panel);
Also, variable names should NOT start with an upper case character! "Yes" does not follow Java standards. The other variables do. Be consistent!

How to have one component on the left and one on the right by FlowLayout

In a part of my software I have a layout on bottom that holds couple of JButtons and a JLabel. I want to keep buttons one the right side of the panel, and label on the left side. I could manage to put buttons on the right, but do not know how to keep the JLabel on the left side.
Here is the code:
bottomPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
ftpBack = new JButton("Back");
ftpNext = new JButton("Next");
label = new JLabel("Text);
bottomPanel.add(label);
bottomPanel.add(ftpBack);
bottomPanel.add(ftpNext);
mainPanel.add(bottomPanel, BorderLayout.SOUTH);
This is what I am trying to achieve:
Any idea how to make it ?

You can't do this with a FlowLayout.
You can use a horizontal BoxLayout:
Box box = Box.createHorizontalBox();
box.add(label);
box.add(Box.createHorizontalGlue());
box.add(backButton);
box.add(Box.createHorizontalStrut(5));
box.add(nextButton);
Read the section from the Swing tutorial on How to Use BoxLayout for more information and examples.
Or another approach is to nest layout managers:
JPanel main = new JPanel( new BorderLayout() );
main.add(label, BorderLayout.WEST);
JPanel buttonPanel= new JPanel();
buttonPanel.add(back);
buttonPanel.add(next);
main.add(buttonPanel, BorderLayout.EAST);

JScrollPane increases its size

I have a panel which is divided by two parts with BoxLayout.X_AXIS:
public TabsPanel() {
setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
add(createLeftPanel());
add(createRightPanel());
}
Each left and right panels have the following structure: an outer panel with BorderLayout, and an inner panel in BorderLayout.CENTER of the outer panel, which in its turn has BoxLayout.Y_AXIS and several components from top to bottom. The right panel has JTextArea with JScrollPane as one of its components:
protected JPanel createRightPanel() {
JPanel pane = new JPanel();
pane.setLayout(new BorderLayout());
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
JTextArea label = createLabel();
JScrollPane scroll = new JScrollPane(label);
scroll.setMaximumSize(new Dimension(500, 200));
panel.add(Box.createRigidArea(new Dimension(0,106)));
panel.add(scroll);
JPanel panel_buttons = new JPanel();
panel_buttons.setLayout(new BoxLayout(panel_buttons, BoxLayout.LINE_AXIS));
panel_buttons.setAlignmentX(Component.CENTER_ALIGNMENT);
Font font_text = new Font("Georgia", Font.PLAIN, 20);
JButton[] buttons = new JButton[2];
buttons[0] = new JButton("Clear");
buttons[1] = new JButton("Exit");
for (int i = 0; i < buttons.length; i++) {
buttons[i].setMaximumSize(new Dimension(120, 40));
buttons[i].setFont(font_text);
panel_buttons.add(buttons[i]);
if (i == 0)
panel_buttons.add(Box.createRigidArea(new Dimension(40, 0)));
buttons[i].addActionListener(new TextActionListener(label));
}
panel.add(Box.createRigidArea(new Dimension(0,20)));
panel.add(panel_buttons);
pane.add(panel, BorderLayout.CENTER);
return pane;
}
When text goes beyond the borders, scroll bars appear and I can move them and read the text. Looks like everything is ok, but when I either click any place outside the scroll pane or even just move the pointer, the scroll pane moves to the left and grows down. It doesn't change its width, but it shifts to the left because the area between it and the right panel's borders increases. Accordingly, size of the left panel shrinks. When I clear the text area and again either click or move the pointer, it is back to its normal size.
What is the reason its height grows and its left and right margins increase? What am I doing wrong?
UPDATE. I've found the problem. The thing is that I didn't create JTextArea correctly. I initialized it without parameters:
JTextArea text = new JTextArea("Some initial text");
Now I have rewritten:
JTextArea text = new JTextArea(5,10);
It is now shifted to the left by about 5 mm and do not changes its height. Still not perfect, but looks like I am on the right track.
Thank you everybody for your help!

BoxLayout accepting Min, Max and PreferredSize override those methods for JPanel
use JSPlitPane, there you can to hide Divider

2 steps to correct:
Set the size of the JTextArea: JTextArea text = new JTextArea(row, col);
Still shifts to the left by the size of the vertical bar:
either add ChangeListener to adjust the size of the JScrollPane
scroll.getViewport().addChangeListener(new ChangeListener() {
#Override
public void stateChanged(ChangeEvent e) {
if (scroll.getVerticalScrollBar().isVisible())
scroll.setPreferredSize(480, 200);
}
}
});
or add scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

Java swing layouts and/or labels not in order

I have got a window that should display the following:
JLablel "Have you used GUI before?" on the top, centered
two radioButtons "Yes" and "No" below it, somewhat in the center, a little bit towards the left
a JButton "NEXT" in the bottom-right corner
All three elements should have green font and darkGrey background.
The problem is that the window which is showing up, does not look like I would like it to.
And this is my code:
yesButton = new JRadioButton(yes);
//yesButton.setMnemonic(KeyEvent.VK_B); // doesn't work?
yesButton.setActionCommand(yes);
noButton = new JRadioButton(no);
// noButton.setMnemonic(KeyEvent.VK_C); // doesn't work?
noButton.setActionCommand(no);
ButtonGroup group = new ButtonGroup();
group.add(yesButton);
group.add(noButton);
nextButton = new JButton("NEXT");
nextButton.setActionCommand(next);
yesButton.addActionListener(this);
noButton.addActionListener(this);
nextButton.addActionListener(this);
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(yesButton);
radioPanel.add(noButton);
add(radioPanel, BorderLayout.WEST);
// setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
// radioPanel.setBorder(new EmptyBorder(250, 250, 20, 20));
// there is no difference between the above two, right?
String q = "Have you used GUI before?";
JPanel area = new JPanel(new BorderLayout());
area.setBackground(Color.darkGray);
JLabel textLabel2 = new JLabel("<html><div style=\"text-align: center;\">"
+ q + "</html>", SwingConstants.CENTER);
textLabel2.setForeground(Color.green);
Font font2 = new Font("SansSerif", Font.PLAIN, 30);
textLabel2.setFont(font2);
//textLabel2.setBorder(new EmptyBorder(0, 0, 250, 0)); //top, left, bottom, right
area.add(textLabel2, BorderLayout.NORTH);
area.add(nextButton, BorderLayout.EAST);
add(area, BorderLayout.CENTER);
I feel I'm nearly there, thanks for any help!
--EDIT--
A screenshot:

You need to use nested panels.
for the BorderLayout.NORTH you can add the JLabel directly. You will need to set the horizontal text alignment to center.
for the radio buttons you can create a JPanel with a FlowLayout and then add the buttons to the panel and add the panel to the CENTER.
for the button you add the button to a panel using a FlowLayout that is right aligned, then add the panel to the SOUTH.
There are other choices. You could also use a Vertical BoxLayout as the layout of the main panel and then add child panels to it.

You won't be able to get much control with just a BorderLayout. Try something else like MigLayout or one of the other many many layout managers Java has (GridBag, Box, etc).
In MigLayout it would look something like:
area.setLayout(new MigLayout("fill"));
area.add(textLabel2, "wrap");
area.add(radioPanel, "wrap");
area.add(nextButton, "tag right");