Develop Reference

How to update Jpanel using JComboBox

i'm new in java language, and i'm trying to create a GUI which it has JComboBox to allow the user to select one of the choices and based on the selected option the panel is updated by adding more text fields.
currently i'm facing an issue which is the panel doesn't updated if I choosed (choice 1) it should appear 5 text fields with their labels.
My question is: how can I update the panel to add more text fields based on the selected option from JComboBox by the user?
Also, I'm facing another issue which i couldn't find a way to setting the size of JFrame
Here is my code:
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class RTSS extends JFrame implements ActionListener {
private JComboBox cb;
JPanel main;
JPanel panel3;
JPanel panel2;
JPanel panel1;
GridBagConstraints gbc;
String[] choices;
JLabel Label1;
JLabel Label2;
JLabel Label3;
JLabel Label4;
JLabel Label5;
JTextField tf1;
JTextField tf2;
JTextField tf3;
JTextField tf4;
JTextField tf5;
public RTSS() {
Border blackline = BorderFactory.createLineBorder(Color.black);
EmptyBorder b1 = new EmptyBorder(5, 0, 0, 0);
main = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel3 = new JPanel(new FlowLayout(FlowLayout.LEFT));
panel3.setAlignmentX(1);
panel3.setPreferredSize(new Dimension(800, 35));
panel3.setBorder(b1);
main.add(panel3);
panel2 = new JPanel();
panel1 = new JPanel();
panel1.setPreferredSize(new Dimension(700, 500));
panel1.setBorder(blackline);
panel1.setLayout(new GridBagLayout());
gbc = new GridBagConstraints();
choices = new String[]{ "","Choice 1", "Choice 2", "Choice 3 "};
cb = new JComboBox(choices);
//Main inputs (labels)
Label1 = new JLabel("Label 1 ");
Label2 = new JLabel("Label 2 ");
Label3 = new JLabel("Label 3");
Label4 = new JLabel("Label 4 ");
Label5 = new JLabel("Label 5 ");
//TextFields
tf1 = new JTextField(10);
tf2 = new JTextField(10);
tf3 = new JTextField(10);
tf4 = new JTextField(10);
tf5 = new JTextField(10);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.insets = new Insets(10, 3, 5, 0);
panel3.add(cb);
panel2.add(panel1);
gbc.gridx = 0;
gbc.gridy = 0;
panel1.add(Label1, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
panel1.add(Label2, gbc);
gbc.gridx = 0;
gbc.gridy = 2;
panel1.add(Label3, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
panel1.add(tf1, gbc);
gbc.gridx = 1;
gbc.gridy = 1;
panel1.add(tf2, gbc);
gbc.weightx = 0.5;
gbc.weighty = 0.5;
gbc.gridx = 1;
gbc.gridy = 2;
panel1.add(tf3, gbc);
main.add(panel2);
add(main);
}
#Override
public void actionPerformed(ActionEvent e) {
String Choice = cb.getSelectedItem().toString();
if ("Choice 1".equals(Choice)) {
gbc.gridx = 0;
gbc.gridy = 3;
panel1.add(Label4, gbc);
gbc.gridx = 1;
gbc.gridy = 3;
panel1.add(tf4, gbc);
gbc.gridx = 0;
gbc.gridy = 4;
panel1.add(Label5, gbc);
gbc.weightx = 6;
gbc.weighty = 1;
gbc.gridx = 1;
gbc.gridy = 4;
panel1.add(tf5, gbc);
}
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception ex) {
ex.printStackTrace();
}
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new RTSS().setVisible(true);
}
});
}
}

Add the following lines to the end of the RTSS constructor:
public RTSS() {
//your code
//this lines
pack();
setLocationRelativeTo(null);
cb.addActionListener(this);
}
These 3 lines will 1.set the layout, 2. center the frame and 3. activate the ActionListener.
If you now make a selection in the ComboBox, your code will be executed in the ActionListener.
After a selection in the ComboBox that changes the layout, call pack() again.
#Override
public void actionPerformed(ActionEvent e) {
String Choice = cb.getSelectedItem().toString();
if ("Choice 1".equals(Choice)) {
// your code
pack();
}
}

Swing GridBagLayout: centering a button on the second row

I have this code that displays a label, a textfield and a button:
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Form extends JFrame implements ActionListener {
private JLabel label = new JLabel("What's your name:");
private JTextField field = new JTextField(15);
private JButton button = new JButton("Send");
public Form() {
setTitle("Name Form");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(10, 10, 10, 1);
gbc.anchor = GridBagConstraints.LINE_END;
gbc.gridx = 0;
gbc.gridy = 0;
add(label, gbc);
gbc = new GridBagConstraints();
gbc.insets = new Insets(10, 10, 10, 10);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 1;
gbc.gridy = 0;
add(field, gbc);
gbc = new GridBagConstraints();
gbc.insets = new Insets(10, 10, 10, 10);
gbc.anchor = GridBagConstraints.LINE_END;
gbc.gridx = 0;
gbc.gridy = 1;
add(button, gbc);
}
#Override
public void actionPerformed(ActionEvent event) {
}
public static void main(String[] args) {
Form myFrame = new Form();
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.pack();
myFrame.setVisible(true);
}
}
It shows this:
I need the button to be horizontally centered like this:
How do I do this with GridBagLayout? I tried different values for anchor but nothing worked.
EDIT:
Adding gbc.gridwidth = 2 showed this:

The button needs to stretch over the two columns, so set the gridwidth.
gbc.gridwidth = 2;
(Btw, you don't need to create a new GridBagConstraints for each component. Just reuse the say one and only change the properties that are different.)

Opening a new class (JFrame) from JButton Issue

just a disclaimer: I already checked most of Stack Overflow and couldn't find an answer on the website. I also asked some nice people on Reddit, but only fixed it halfway through.
So, I am trying the create a GUI application and I am new to the Java language (very, very new - so there is a big chance I am making a rookie mistake). I already designed my interface for my 'StartScreen' and I wanted to make button1 to open my second class ('NewUsers').
I was using the GUI Editor and I think this is probably the cause of my problems, as an answer to my question online I just saw people add
this.dispose();
new JFrame().setVisible(true);
This doesn't work on me however. I managed to fix it until a certain point and now I am able to close the frame on a click, but I still can't figure out how to open another frame from the button :(. Here is my code for Frame1('StartScreen'). Frame2 is just an empty window for now, but it's for testing purposes.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
public class StartScreen {
private final JFrame frame;
private JButton newUserButton;
private JButton existingUserButton;
private JButton nonUserBookingButton;
private JPanel panell;
public StartScreen() {
this.frame = new JFrame("StartScreen");
frame.setContentPane(panell);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
newUserButton.addActionListener(this::onNewUserClicked);
}
public static void newuserscall
() {
NewUsers newuserscall = new NewUsers();
}
private void onNewUserClicked(ActionEvent event) {
frame.setVisible(false);
}
public static void main(String[] args) {
new StartScreen();
}
{
// GUI initializer generated by IntelliJ IDEA GUI Designer
// >>> IMPORTANT!! <<<
// DO NOT EDIT OR ADD ANY CODE HERE!
$$$setupUI$$$();
}
/**
* Method generated by IntelliJ IDEA GUI Designer
* >>> IMPORTANT!! <<<
* DO NOT edit this method OR call it in your code!
*
* #noinspection ALL
*/
private void $$$setupUI$$$() {
panell = new JPanel();
panell.setLayout(new GridBagLayout());
panell.setPreferredSize(new Dimension(600, 400));
final JPanel spacer1 = new JPanel();
GridBagConstraints gbc;
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 4;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.insets = new Insets(30, 0, 0, 0);
panell.add(spacer1, gbc);
newUserButton = new JButton();
newUserButton.setText("Button");
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 2;
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.BOTH;
panell.add(newUserButton, gbc);
existingUserButton = new JButton();
existingUserButton.setText("Button");
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 4;
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.BOTH;
panell.add(existingUserButton, gbc);
nonUserBookingButton = new JButton();
nonUserBookingButton.setText("Button");
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 6;
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.BOTH;
panell.add(nonUserBookingButton, gbc);
final JPanel spacer2 = new JPanel();
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 3;
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.VERTICAL;
panell.add(spacer2, gbc);
final JPanel spacer3 = new JPanel();
gbc = new GridBagConstraints();
gbc.gridx = 2;
gbc.gridy = 5;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.insets = new Insets(0, 250, 0, 0);
panell.add(spacer3, gbc);
final JPanel spacer4 = new JPanel();
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 5;
gbc.fill = GridBagConstraints.VERTICAL;
panell.add(spacer4, gbc);
final JPanel spacer5 = new JPanel();
gbc = new GridBagConstraints();
gbc.gridx = 2;
gbc.gridy = 1;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.insets = new Insets(25, 0, 0, 0);
panell.add(spacer5, gbc);
final JLabel label1 = new JLabel();
label1.setText("Label");
gbc = new GridBagConstraints();
gbc.gridx = 2;
gbc.gridy = 0;
panell.add(label1, gbc);
final JPanel spacer6 = new JPanel();
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 6;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.insets = new Insets(30, 0, 0, 0);
panell.add(spacer6, gbc);
final JPanel spacer7 = new JPanel();
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 2;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.insets = new Insets(30, 0, 0, 0);
panell.add(spacer7, gbc);
}
/**
* #noinspection ALL
*/
public JComponent $$$getRootComponent$$$() {
return panell;
}
}
Thanks in advance! I hope some of you can figure out a way I can fix my code :(
Regards

Well what I'll start out saying is that you are correct: never use a GUI Builder. I don't even mean when you're trying to learn, I mean never use it. It's mainly there for prototyping a concept and not meant for you to use it for learning or production code. Below is a cleaned up more precise example for you, but in your particular example, you need to add your
new JFrame().setVisible(true);
inside of your onNewUserClicked function. Also, note that when you do that, you're creating an empty frame, that will be the absolute minimum amount of size that it takes for your OS to create it because there's nothing in it, you never packed the frame, and never manually and explicitly set the size, so check around your top left area of your monitor - it's there.
Here is probably closer to what you want in terms of cleanliness.
public class Foo {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
final JFrame jf = new JFrame();
JPanel jp = new JPanel();
JButton jb = new JButton("New Frame");
jb.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
jf.setVisible(false);
new JFrame().setVisible(true);
}
});
jp.setLayout(new FlowLayout());
jp.add(jb);
jf.setContentPane(jp);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setVisible(true);
jf.pack();
}
}
}
}
The reason why I say cleaner at all, is because of the control of a LayoutManager. GUI builders like the one you use always tend to use GridBagLayout because it's easier for it to dynamically (from your user input) place things precisely. But the code it generates is unmanageable. And things get worse when you consider that if you expand or contract your GUI, that the GridBagLayout is not flexible with this so now your Components are stuck exactly where you placed them when dragging them from the GUI Builder. Proper use of the correct LayoutManager will give you a flexible and manageable GUI. Check out this Oracle guide for more info and help: https://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

That is because you are disposing the parent frame before showing the new one.
In this scenario your parent frame, from which you are calling
new JavaFrame2().SetVisibility(true);
contains the handle to the new JavaFrame. By disposing the parent frame you technically delete the parent -> you cant do something with it any more.
Try hiding the startscreen by calling .SetVisibility(false) instead of this.dispose();.

Multiple Panels Below Each Other

Is it possible i can have a top panel for a login. Then a middle and bottom panel underneath.
I'm using gridbaglayout and i have assigned 2 panels. One panel has components linked to it for login details and the other panel has other components linked to it. However, it's not going occurring to plan.
Ive tried using Box/Borderlayout to do this, but then i'm not able to create the spacing i want.
Here is a sketch of what i want.
public class GUI extends JFrame{
private JPanel myTopPL, myTopPL2;
private JTextField myUsernameTF;
private JTextField myPasswordTF;
private JTextField myMessageTF;
private JLabel myUsernameLBL;
private JLabel myPasswordLBL;
private JLabel myItemsLBL;
private JTextArea myMainTA;
private JButton myLoginBN;
private JButton myConnectBN;
private JButton mySendBN;
private JComboBox myItemsCB;
public GUI () {
super("GUI ");
setLayout(new GridBagLayout());
myTopPL = new JPanel();
myTopPL2 = new JPanel();
myTopPL.setLayout(new GridBagLayout());
myTopPL2.setLayout(new GridBagLayout());
GridBagConstraints myTopPLGBC = new GridBagConstraints();
myTopPLGBC.weightx = 1;
myTopPLGBC.weighty = 1;
GridBagConstraints myTopPLGBC2 = new GridBagConstraints();
myTopPLGBC.weightx = 2;
myTopPLGBC.weighty = 2;
myUsernameLBL = new JLabel("Username: ");
myUsernameLBL.setFont(new Font("Arial", Font.BOLD, 13));
myTopPLGBC.gridx = 1;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myUsernameLBL, myTopPLGBC);
myUsernameTF = new JTextField(10);
myTopPLGBC.gridx = 2;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myUsernameTF,myTopPLGBC);
myPasswordLBL = new JLabel("Password: ");
myPasswordLBL.setFont(new Font("Arial", Font.BOLD, 13));
myTopPLGBC.gridx = 3;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myPasswordLBL, myTopPLGBC);
myPasswordTF = new JTextField(10);
myTopPLGBC.gridx = 4;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myPasswordTF,myTopPLGBC);
myLoginBN = new JButton("Login");
myTopPLGBC.gridx = 5;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myLoginBN,myTopPLGBC);
myItemsLBL = new JLabel("Items: ");
myItemsLBL.setFont(new Font("Arial", Font.BOLD, 13));
myTopPLGBC2.gridx = 1;
myTopPLGBC2.gridy = 3;
myTopPLGBC2.insets = new Insets(5,5,5,5);
myTopPL2.add(myItemsLBL, myTopPLGBC2);
myItemsCB = new JComboBox();
myItemsCB.addItem(" Select an Item ");
myTopPLGBC2.gridx = 1;
myTopPLGBC2.gridy = 4;
myTopPLGBC2.insets = new Insets(5,5,5,5);
myTopPL2.add(myItemsCB, myTopPLGBC2);
myConnectBN = new JButton("Connect");
myTopPLGBC2.gridx = 2;
myTopPLGBC2.gridy = 4;
myTopPLGBC2.insets = new Insets (5,5,5,5);
myTopPL2.add(myConnectBN, myTopPLGBC2);
GridBagConstraints GBC = new GridBagConstraints();
GBC.anchor = GridBagConstraints.NORTHWEST;
GBC.weightx = 1;
GBC.weighty = 1;
this.add(myTopPL,GBC);
GridBagConstraints GBC2 = new GridBagConstraints();
GBC2.anchor = GridBagConstraints.NORTHWEST;
GBC2.weightx = 2;
GBC2.weighty = 2;
this.add(myTopPL2,GBC2);
}
public static void main(String[] args) {
GUI GUI = new GUI ();
GUI .setDefaultCloseOperation(RMIAuctionHouse.EXIT_ON_CLOSE);
GUI .setSize(750,500);
GUI .setVisible(true);
}
}

I'd break down the application into it's individual areas of responsibilities and focus on creating the UI elements to support it. This will allow you to focus on the needs of each section of your application, it also allows you the opportunity to change around the layout as you need
public class TestLayout15 {
public static void main(String[] args) {
new TestLayout15();
}
public TestLayout15() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new MainPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MainPane extends JPanel {
private JTextField messageField;
private JButton sendButton;
public MainPane() {
setBorder(new EmptyBorder(4, 4, 4, 4));
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(new LoginPane(), gbc);
gbc.gridy++;
add(new ConnectPane(), gbc);
gbc.gridy++;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
add(new JScrollPane(new JTextArea(5, 20)), gbc);
gbc.gridwidth = 1;
messageField = new JTextField(10);
sendButton = new JButton("Send");
gbc.gridy++;
gbc.weighty = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(messageField, gbc);
gbc.gridx++;
gbc.weightx = 0;
add(sendButton, gbc);
}
}
public class ConnectPane extends JPanel {
private JComboBox comboBox;
private JButton connectButton;
public ConnectPane() {
comboBox = new JComboBox();
connectButton = new JButton("Connect");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(comboBox, gbc);
gbc.gridx++;
gbc.weightx = 1;
add(connectButton, gbc);
}
}
public class LoginPane extends JPanel {
private JTextField userNameField;
private JPasswordField passwordField;
private JButton loginButton;
public LoginPane() {
userNameField = new JTextField(10);
passwordField = new JPasswordField(10);
loginButton = new JButton("Login");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(new JLabel("User name:"), gbc);
gbc.gridx++;
add(userNameField, gbc);
gbc.gridx++;
add(new JLabel("Password:"), gbc);
gbc.gridx++;
add(passwordField, gbc);
gbc.gridx++;
gbc.weightx = 1;
add(loginButton, gbc);
}
}
}

To start with, replace the call to GUI.setSize(750,500) with GUI.pack(). That will size the window to fit your content. After doing that you'll see the second panel is appearing to the right of the first. This is because you did not set gridx/gridy on GBC2 so it defaults to putting myTopPL2 to the right of myTopPL1, not below it.
I rarely explicitly set the gridx/gridy when using GridBagLayout. For your first row of the display, I would use default values for all but myLoginBN where I would set gridwidth to GridBagConstraints.REMAINDER. That tells GridBagLayout that nothing else goes on this row. The next item added with a default gbc will be placed at the start of the second row.
Minor nits:
Use standard Java capitalization:
Class name are camelcase with a leading uppercase character. So, "Gui", not "GUI".
Instance names are camelcase with a leading lowercase character. So, "gbc1" not "GBC1"
Use SwingUtilities.InvokeLater to start the Gui on the EDT
SwingUtilities.invokeLater(new Runnable() {
public void run() {
GUI GUI = new GUI ();
GUI .setDefaultCloseOperation(RMIAuctionHouse.EXIT_ON_CLOSE);
GUI .setSize(750,500);
GUI .setVisible(true);
}});

Seems you are not familiar with Java layouts, so i recomend you to try null(absolute) Layout:
setLayout(null);
...
component.setBounds( x, y, width, heigh );
add(component);
Here example
package gui;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class GUI extends JFrame{
private JTextField myUsernameTF;
private JLabel myUsernameLBL;
public GUI() {
super("GUI ");
setLayout(null);
myUsernameLBL = new JLabel("Username: ");
myUsernameLBL.setFont(new Font("Arial", Font.BOLD, 13));
myUsernameLBL.setBounds(50,30,80,20);
add(myUsernameLBL);
myUsernameTF = new JTextField(10);
myUsernameTF.setBounds(190,30,80,20);
add(myUsernameTF);
// and so on ...
}
public static void main(String[] args) {
GUI frame = new GUI();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(750,500);
frame.setVisible(true);
}
}
Good luck on thorny way to handle java swing =)

Java Swing. TextField inside a ScrolPane is not entirely visible

I have the structure as you can see in the picture.
For both panels, GridBagLayout is used.
The problem is that the text field inside the scrollpane is not entirely visible.
The parent panel stretches only for the buttons to become visible, but when the scroll bar appears, it just overlap with the text field.
Is there an easy solution to fix this (don't want to deal with setting custom / preferred / minimum heights)?
Panel structure :
Problem :
Ok, here is an SSCCE
public class Main {
JFrame frame;
private JPanel mainPanel;
private JButton button1;
private JButton button2;
private JTextField someTextTextField;
public static void main(String[] args) {
Main main = new Main();
main.show();
}
private void show() {
frame = new JFrame("Frame");
frame.setContentPane(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
{
$$$setupUI$$$();
}
/**
* Method generated by IntelliJ IDEA GUI Designer
* >>> IMPORTANT!! <<<
* DO NOT edit this method OR call it in your code!
*
* #noinspection ALL
*/
private void $$$setupUI$$$() {
mainPanel = new JPanel();
mainPanel.setLayout(new GridBagLayout());
mainPanel.setPreferredSize(new Dimension(209, 30));
final JPanel panel1 = new JPanel();
panel1.setLayout(new GridBagLayout());
GridBagConstraints gbc;
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
gbc.weightx = 0.5;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.BOTH;
mainPanel.add(panel1, gbc);
button1 = new JButton();
button1.setText("Button");
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
panel1.add(button1, gbc);
button2 = new JButton();
button2.setText("Button");
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
panel1.add(button2, gbc);
final JScrollPane scrollPane1 = new JScrollPane();
scrollPane1.setAlignmentX(0.0f);
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0.5;
gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.BOTH;
mainPanel.add(scrollPane1, gbc);
someTextTextField = new JTextField();
someTextTextField.setText("some text");
scrollPane1.setViewportView(someTextTextField);
}
/**
* #noinspection ALL
*/
public JComponent $$$getRootComponent$$$() {
return mainPanel;
}
}

Try and use a JTextArea instead of a JTextField. And if you don't want to set custom/preferred/minimum sizes, you can use the JTextArea.setRows(int rows) method. I hope that helps.