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How to store and display user input in JList?

I don't know what I am doing wrong. I am trying to take a JTextField user input to be stored and displayed in a JList, but every time the button is pressed to store the user input the JList remains blank. Any help would be greatly appreciated.
DefaultListModel<String> model = new DefaultListModel<String>();
menuList = new JList<String>(model);
menuList.setBounds(500, 65, 300, 400);
menuList.setSelectionBackground(Color.LIGHT_GRAY);
menuList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
btnCreateMenu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
childFrame = new JFrame("New Menu");
childFrame.setBounds(340, 300, 400, 200);
childFrame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
childFrame.getContentPane().setLayout(null);
childFrame.setVisible(true);
lblNewMenu = new JLabel("Menu Name:");
lblNewMenu.setBounds(30, 60, 200, 20);
childFrame.getContentPane().add(lblNewMenu);
input = new JTextField();
String userInput = input.getText();
input.setBounds(lblNewMenu.getX() + 80, lblNewMenu.getY(), 250, 30);
childFrame.getContentPane().add(input);
btnMenuInput = new JButton("Create New Menu");
btnMenuInput.setBounds(120, 100, 200, 30);
btnMenuInput.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
model.addElement(userInput);
menuList.setModel(model);
childFrame.setVisible(false);
Entree selectedEntree = (Entree)cboEntrees.getSelectedItem();
Side selectedSide = (Side)cboSides.getSelectedItem();
Salad selectedSalad = (Salad)cboSalads.getSelectedItem();
Dessert selectedDessert = (Dessert)cboDesserts.getSelectedItem();
Menu menu = new Menu(userInput, selectedEntree, selectedSide, selectedSalad, selectedDessert);
menuArray.add(menu);
}
});
childFrame.getContentPane().add(btnMenuInput);
}
});
mainframe.setVisible(true);

This line
userInput = input.getText();
needs to be called first in the ActionListener. Otherwise you never get the latest String from the text field.
e.g.,
public void actionPerformed(ActionEvent e){
userInput = input.getText();
model.addElement(userInput);
//menuList.setModel(model); // not needed
Also, as mentioned by camickr in comment, avoid using null layouts and setBounds as this fights against the Swing GUI library rather than working with it, making it much harder to create flexible easy to update and edit GUI's.
Also, the childFrame top-level window should be a JDialog and not a second JFrame. Please see The Use of Multiple JFrames: Good or Bad Practice? for more on this.

Also note that you should create the entire dialog or Frame before you make it visible, or else some of the items may not be visible at first.
Another problem is the use of JFrame.HIDE_ON_CLOSE. You should probably be using DISPOSE_ON_CLOSE instead. Otherwise the frame will just be hidden, but will still exist, possibly for the life of the program.

JAVA - I have 2 windows and i need to close 1 window

My java program is opening new window when i press one button in first window. Then i need to close first window. When i try to close first window with System.exit(0); it closes second window. I tryed setVisible(false); then first window doesn't close. Please help!
Whole code:
public class NameChooser extends JFrame implements ActionListener {
public NameChooser() {
RunNC();
}
public final void RunNC() {
JPanel panel = new JPanel();
JLabel label = new JLabel("Enter your name that will be shown in game!");
label.setBounds(20, 10, 500, 25);
panel.add(label);
JLabel error = new JLabel("");
error.setForeground(Color.red);
panel.add(error);
JTextField name = new JTextField(30);
name.setBounds(50, 40, 180, 25);
panel.add(name);
JButton playButton = new JButton( new AbstractAction("Play") {
#Override
public void actionPerformed(ActionEvent e) {
String enteredname = name.getText();
if("".equals(enteredname)) {
error.setVisible(true);
error.setText("Invalid name!");
error.setBounds(105, 95, 100, 25);
System.out.println("Invalid name!");
}
else if(enteredname.length() > 10) {
error.setVisible(true);
error.setText("Name cant have more than 10 characters!");
error.setBounds(25, 95, 600, 25);
System.out.println("Name cant have more than 10 characters!");
}
error.setVisible(false);
GameWindow game = new GameWindow();
game.StartGame();
// I need to close window on this line!
}
});
playButton.setBounds(110, 70, 60, 25);
panel.add(playButton);
}
Any help?

Your problem is caused because System.exit() causes the Java VM to terminate completely - and both of your windows are running on the same VM instance.
Use Jframe.dispose() instead on the one you want to close.

System.exit(0);
doesn't "close a window", it terminates the JVM in which your entire application is running, hence, it terminates the entire application.
If we're talking about JFrames, try by using the dispose() method to close your seperate screens.
If you want us to comment on your setVisible(false), show us the code where you call it, it might be you're calling it on the wrong variable.

textArea.setText("") doesn't clear the text in a JTextArea

I am trying to clear the text in a JTextArea, and looking at other questions, it seems like calling textArea.setText(""/null) will clear the text area. This does not seem to be happening with my code, and it appends the new text to the text already in the area. Can anyone see something wrong in my code?
public class morseJFrame extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
public JTextPane textPane = new JTextPane();
public JTextArea textArea = new JTextArea();
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
morseJFrame frame = new morseJFrame();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public morseJFrame() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 508);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
textPane.setBounds(5, 5, 424, 194);
textPane.setText("Enter your alphanumberic text here to translate.");
contentPane.add(textPane);
JButton btnTranslate = new JButton("Translate");
btnTranslate.setBounds(5, 419, 213, 41);
btnTranslate.addActionListener(this);
add(btnTranslate);
contentPane.add(btnTranslate);
textArea.setBounds(5, 210, 424, 203);
contentPane.add(textArea);
JButton btnPlaySound = new JButton("Play Morse Sound");
btnPlaySound.setBounds(228, 419, 201, 41);
contentPane.add(btnPlaySound);
}
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (command.equals("Translate")) {
String text = textPane.getText();
String translatedText = MorseTranslate.doMorse(text);
textArea.setText("");
textArea.setText(translatedText);
}
}
}

This does not seem to be happening with my code, and it appends the new text to the text already in the area
So based on this code...
String text = textPane.getText();
String translatedText = MorseTranslate.doMorse(text);
textArea.setText("");
textArea.setText(translatedText);
I would suggest that the problem is with your MorseTranslate.doMorse which is probably returning the text appended to itself
But, as you can see, this is a matter of "guess work" as we don't have the complete code to go by.
Consider providing a runnable example which demonstrates your problem. This is not a code dump, but an example of what you are doing which highlights the problem you are having. This will result in less confusion and better responses

Try to reverse the order like this:
textArea.setText(translatedText);
textArea.setText("");
Use either textArea.setText(null) or textArea.setText("") are the same thing.

I think setText() replaces the content (not append), so you don't need to do setText("") and then setText("the text you want"), the latest sentence should be enough.

setText("") doesn't clear the text
Yes it does.
textArea.setText("");
Here you are clearing the text area.
textArea.setText(translatedText);
Here, in the very next line, you are setting it to something else.

You could alternatively try:
textArea.setText(null);
See if that works. But I agree with Wyatt, you are setting other text right after clearing it.

Have you inserted a simple print statement to see what textPane.getText() is actually setting String text to before sending it to doMorse(String)?

Improper Alignment Error with Java AWT. Cannot get my label to move

I have put a label into my frame, but it refuses to move. SetBounds() is not working, and I get an improper alignment error if I put any argument past "Result" below that isn't 0, 1, or 2, none of which put it in the correct place. Here's where I declare the Label:
Label result = new Label("Result.", 3);
Here's the SetBounds statement:
result.setBounds(0, 1500, 100, 20);
This program I am writing, I simply just want to have the user input 2 numbers, add them, and print the result using GUI components. The result is the label which refuses to change. The code of the entire program is below, and the program is still not done yet, but if you compile it, result is always stuck to the left and I want it to be at the same level as the TextFields. This problem is actually happening with the other labels, Help1, and Help2. Please don't tell me I have to use swing! I dislike swing.
I have yet to change the event to where it adds the user inputs. I copied the event from a previous program.
The code: (Sorry for no comments, but it's not a huge program)
import java.awt.*;
import java.awt.event.*;
public class MouseClick {
TextField number1;
TextField number2;
public static void main(String[] args) {
MouseClick MC = new MouseClick();
}
public MouseClick() {
Frame f = new Frame("Addition Time!");
Button button = new Button("Click Here To Add The Two Numbers.");
button.setBounds(175, 250, 230, 30);
button.addMouseListener(new MyMouseListener());
f.add(button);
Label help1 = new Label("Enter the first number below.");
Label help2 = new Label("Enter the second number below.");
Label exprsn1 = new Label("+", 0);
Label exprsn2 = new Label("=", 0);
Label result = new Label("Result.", 3);
number1 = new TextField("TextField1", 100);
number2 = new TextField("TextField2", 100);
help1.setBounds(50, 80, 150, 20);
help2.setBounds(250, 80, 150, 20);
exprsn1.setBounds(00, 80, 30, 30);
exprsn2.setBounds(00, 80, 30, 30);
number1.setBounds(50, 100, 100, 20);
number2.setBounds(250, 100, 100, 20);
result.setBounds(0, 1500, 100, 20);
f.add(number1);
f.add(number2);
f.add(help1);
f.add(help2);
f.add(result);
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
});
f.setSize(600, 300);
f.setVisible(true);
}
public class MyMouseListener extends MouseAdapter {
public void mouseClicked(MouseEvent me) {
String S = number1.getText();
number2.setText(S);
}
}
}

The error is because 3 is not an allowed value for parameter "alignment" in the constructor
Label(String text, int alignment)
Are you getting confused with TextField() which has a similar constructor?
TextField(String text, int columns)
The reason the label is not appearing in the correct location is because you've not specified your using null layout explicitly. You need this line:
public MouseClick() {
Frame f = new Frame("Addition Time!");
f.setLayout(null); // add this line

How to make PopUp window in java

I am currently developing a java application.
I want to show a new Window which contains a text area and a button.
Do you have any ideas?

The same answer : JOptionpane with an example :)
package experiments;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class CreateDialogFromOptionPane {
public static void main(final String[] args) {
final JFrame parent = new JFrame();
JButton button = new JButton();
button.setText("Click me to show dialog!");
parent.add(button);
parent.pack();
parent.setVisible(true);
button.addActionListener(new java.awt.event.ActionListener() {
#Override
public void actionPerformed(java.awt.event.ActionEvent evt) {
String name = JOptionPane.showInputDialog(parent,
"What is your name?", null);
}
});
}
}

Hmm it has been a little while but from what I remember...
If you want a custom window you can just make a new frame and make it show up just like you would with the main window.
Java also has a great dialog library that you can check out here:
How to Make Dialogs
That may be able to give you the functionality you are looking for with a whole lot less effort.
Object[] possibilities = {"ham", "spam", "yam"};
String s = (String)JOptionPane.showInputDialog(
frame,
"Complete the sentence:\n"
+ "\"Green eggs and...\"",
"Customized Dialog",
JOptionPane.PLAIN_MESSAGE,
icon,
possibilities,
"ham");
//If a string was returned, say so.
if ((s != null) && (s.length() > 0)) {
setLabel("Green eggs and... " + s + "!");
return;
}
//If you're here, the return value was null/empty.
setLabel("Come on, finish the sentence!");
If you do not care to limit the user's choices, you can either use a form of the showInputDialog method that takes fewer arguments or specify null for the array of objects. In the Java look and feel, substituting null for possibilities results in a dialog that has a text field and looks like this:

JOptionPane is your friend : http://www.javalobby.org/java/forums/t19012.html

Check out Swing Dialogs (mainly focused on JOptionPane, as mentioned by #mcfinnigan).

public class JSONPage {
Logger log = Logger.getLogger("com.prodapt.autotest.gui.design.EditTestData");
public static final JFrame JSONFrame = new JFrame();
public final JPanel jPanel = new JPanel();
JLabel IdLabel = new JLabel("JSON ID*");
JLabel DataLabel = new JLabel("JSON Data*");
JFormattedTextField JId = new JFormattedTextField("Auto Generated");
JTextArea JData = new JTextArea();
JButton Cancel = new JButton("Cancel");
JButton Add = new JButton("Add");
public void JsonPage() {
JSONFrame.getContentPane().add(jPanel);
JSONFrame.add(jPanel);
JSONFrame.setSize(400, 250);
JSONFrame.setResizable(false);
JSONFrame.setVisible(false);
JSONFrame.setTitle("Add JSON Data");
JSONFrame.setLocationRelativeTo(null);
jPanel.setLayout(null);
JData.setWrapStyleWord(true);
JId.setEditable(false);
IdLabel.setBounds(20, 30, 120, 25);
JId.setBounds(100, 30, 120, 25);
DataLabel.setBounds(20, 60, 120, 25);
JData.setBounds(100, 60, 250, 75);
Cancel.setBounds(80, 170, 80, 30);
Add.setBounds(280, 170, 50, 30);
jPanel.add(IdLabel);
jPanel.add(JId);
jPanel.add(DataLabel);
jPanel.add(JData);
jPanel.add(Cancel);
jPanel.add(Add);
SwingUtilities.updateComponentTreeUI(JSONFrame);
Cancel.addActionListener(new ActionListener() {
#SuppressWarnings("deprecation")
#Override
public void actionPerformed(ActionEvent e) {
JData.setText("");
JSONFrame.hide();
TestCasePage.testCaseFrame.show();
}
});
Add.addActionListener(new ActionListener() {
#SuppressWarnings("deprecation")
#Override
public void actionPerformed(ActionEvent e) {
try {
PreparedStatement pStatement = DAOHelper.getInstance()
.createJSON(
ConnectionClass.getInstance()
.getConnection());
pStatement.setString(1, null);
if (JData.getText().toString().isEmpty()) {
JOptionPane.showMessageDialog(JSONFrame,
"Must Enter JSON Path");
} else {
// System.out.println(eleSelectBy);
pStatement.setString(2, JData.getText());
pStatement.executeUpdate();
JOptionPane.showMessageDialog(JSONFrame, "!! Added !!");
log.info("JSON Path Added"+JData);
JData.setText("");
JSONFrame.hide();
}
} catch (SQLException e1) {
JData.setText("");
log.info("Error in Adding JSON Path");
e1.printStackTrace();
}
}
});
}
}

Try Using JOptionPane or Swt Shell .