Hot questions for Using JTextField in joptionpane

Question:

I'm wanting to put several JTextFields into a JOptionPane so that I can validate the information put within them. I know that showInputDialog() will produce one Input, but how would I go about implementing 3/4

EDIT: (At run-time it just shows one input field)

    //JDIALOG(FOR END PAYMENT)
    dialogPanel = new JPanel();
    creditCardNoInput = new JTextField();
    sortCodeInput = new JTextField();
    secNoInput = new JTextField();
    cardHolderName = new JTextField();

    dialogPanel.add(creditCardNoInput);
    dialogPanel.add(sortCodeInput);
    dialogPanel.add(secNoInput);
    dialogPanel.add(cardHolderName);

   int result = JOptionPane.showConfirmDialog(null, dialogPanel, 
                   "Please Enter your card details",    JOptionPane.OK_CANCEL_OPTION);

         if (result == JOptionPane.OK_OPTION) {
             //Execute desired code

Answer:

Use a JPanel.

Put your JTextFields, along with your JLabels (since you'll likely need these as well), into a JPanel or JPanels, and put the main JPanel into the JOptionPane. You can put a complete complex GUI into JPanels and display this in a JOptionPane if desired.

For example:

import java.awt.*;
import java.awt.event.*;
import java.util.HashMap;
import java.util.Map;

import javax.swing.*;

@SuppressWarnings("serial")
public class ComplexOptionPane extends JPanel {
   private PlayerEditorPanel playerEditorPanel = new PlayerEditorPanel();
   private JTextArea textArea = new JTextArea(12, 30);

   public ComplexOptionPane() {
      textArea.setEditable(false);
      textArea.setFocusable(false);
      textArea.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 16));
      JPanel bottomPanel = new JPanel();
      bottomPanel.add(new JButton(new AbstractAction("Get Player Information") {

         @Override
         public void actionPerformed(ActionEvent arg0) {
            int result = JOptionPane.showConfirmDialog(null, playerEditorPanel,
                  "Edit Player JOptionPane", JOptionPane.OK_CANCEL_OPTION,
                  JOptionPane.PLAIN_MESSAGE);
            if (result == JOptionPane.OK_OPTION) {
               for (PlayerEditorPanel.FieldTitle fieldTitle : PlayerEditorPanel.FieldTitle
                     .values()) {
                  textArea.append(String.format("%10s: %s%n",
                        fieldTitle.getTitle(),
                        playerEditorPanel.getFieldText(fieldTitle)));
               }
            }
         }
      }));
      setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
      setLayout(new BorderLayout(5, 5));
      add(new JScrollPane(textArea), BorderLayout.CENTER);
      add(bottomPanel, BorderLayout.PAGE_END);
   }

   private static void createAndShowGui() {
      ComplexOptionPane mainPanel = new ComplexOptionPane();

      JFrame frame = new JFrame("ComplexOptionPane");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

@SuppressWarnings("serial")
class PlayerEditorPanel extends JPanel {
   enum FieldTitle {
      NAME("Name"), SPEED("Speed"), STRENGTH("Strength"), HEALTH("Health");
      private String title;

      private FieldTitle(String title) {
         this.title = title;
      }

      public String getTitle() {
         return title;
      }
   };

   private static final Insets WEST_INSETS = new Insets(5, 0, 5, 5);
   private static final Insets EAST_INSETS = new Insets(5, 5, 5, 0);
   private Map<FieldTitle, JTextField> fieldMap = new HashMap<FieldTitle, JTextField>();

   public PlayerEditorPanel() {
      setLayout(new GridBagLayout());
      setBorder(BorderFactory.createCompoundBorder(
            BorderFactory.createTitledBorder("Player Editor"),
            BorderFactory.createEmptyBorder(5, 5, 5, 5)));
      GridBagConstraints gbc;
      for (int i = 0; i < FieldTitle.values().length; i++) {
         FieldTitle fieldTitle = FieldTitle.values()[i];
         gbc = createGbc(0, i);
         add(new JLabel(fieldTitle.getTitle() + ":", JLabel.LEFT), gbc);
         gbc = createGbc(1, i);
         JTextField textField = new JTextField(10);
         add(textField, gbc);

         fieldMap.put(fieldTitle, textField);
      }
   }

   private GridBagConstraints createGbc(int x, int y) {
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.gridx = x;
      gbc.gridy = y;
      gbc.gridwidth = 1;
      gbc.gridheight = 1;

      gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
      gbc.fill = (x == 0) ? GridBagConstraints.BOTH
            : GridBagConstraints.HORIZONTAL;

      gbc.insets = (x == 0) ? WEST_INSETS : EAST_INSETS;
      gbc.weightx = (x == 0) ? 0.1 : 1.0;
      gbc.weighty = 1.0;
      return gbc;
   }

   public String getFieldText(FieldTitle fieldTitle) {
      return fieldMap.get(fieldTitle).getText();
   }

}

Also -- this answer


An MCVE using your code example:

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.*;
import javax.swing.border.Border;

public class Foo1 {
   private static final Insets WEST_INSETS = new Insets(5, 0, 5, 5);
   private static final Insets EAST_INSETS = new Insets(5, 5, 5, 0);
   private JPanel dialogPanel;
   private JTextField creditCardNoInput;
   private JTextField sortCodeInput;
   private JTextField secNoInput;
   private JTextField cardHolderName;

   public Foo1() {
      dialogPanel = new JPanel(new GridBagLayout());

      Border titleBorder = BorderFactory.createTitledBorder("Credit Card Information");
      Border emptyBorder = BorderFactory.createEmptyBorder(10, 10, 10, 10);
      Border combinedBorder = BorderFactory.createCompoundBorder(titleBorder, emptyBorder);
      dialogPanel.setBorder(combinedBorder);
      creditCardNoInput = new JTextField(5);
      sortCodeInput = new JTextField(5);
      secNoInput = new JTextField(5);
      cardHolderName = new JTextField(5);

      dialogPanel.add(new JLabel("Credit Card Number:"), createGbc(0, 0));
      dialogPanel.add(creditCardNoInput, createGbc(1, 0));
      dialogPanel.add(new JLabel("Sort Code:"), createGbc(0, 1));
      dialogPanel.add(sortCodeInput, createGbc(1, 1));
      dialogPanel.add(new JLabel("Second Number:"), createGbc(0, 2));
      dialogPanel.add(secNoInput, createGbc(1, 2));
      dialogPanel.add(new JLabel("Cardholder Name:"), createGbc(0, 3));
      dialogPanel.add(cardHolderName, createGbc(1, 3));

      int result = JOptionPane.showConfirmDialog(null, dialogPanel,
            "Please Enter your card details", JOptionPane.OK_CANCEL_OPTION,
            JOptionPane.PLAIN_MESSAGE);

      if (result == JOptionPane.OK_OPTION) {
         // Execute desired code
      }
   }

   private static GridBagConstraints createGbc(int x, int y) {
      GridBagConstraints gbc = new GridBagConstraints();
      gbc.gridx = x;
      gbc.gridy = y;
      gbc.gridwidth = 1;
      gbc.gridheight = 1;

      gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
      gbc.fill = (x == 0) ? GridBagConstraints.BOTH
            : GridBagConstraints.HORIZONTAL;

      gbc.insets = (x == 0) ? WEST_INSETS : EAST_INSETS;
      gbc.weightx = (x == 0) ? 0.1 : 1.0;
      gbc.weighty = 1.0;
      return gbc;
   }

   private static void createAndShowGui() {
      new Foo1();
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

Question:

If user enters anything other than 0-9 or + - / * in the JtextField then a JOptionPane display error to user. I seen a few different ways of potentially doing this... Maybe a documentListener or a Inputverifyer.

Main Class

package p2gui;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.event.*;
import javax.swing.JOptionPane;

/**
 *
 *
 */
public class P2GUI extends JFrame implements ActionListener {

    JFrame f = new JFrame("Three Address Generator");// Title

    private final JButton evaluate;
    private final JLabel textfieldLabel;
    private final JTextField entryField;
    private final JLabel resutfieldlabel;
    private final JTextField resultField;
    private final JOptionPane popup = new JOptionPane();

    public void display() {
        setVisible(true);
    }

    P2GUI() {

        f.setSize(425, 180);//450 width and 525 height  
        f.setLayout(null);//using no layout managers  
        f.setVisible(true);//making the frame visible  //window size
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        textfieldLabel = new JLabel("Enter Postfix Expression");
        f.add(textfieldLabel);
        textfieldLabel.setBounds(10, 10, 160, 25);

        entryField = new JTextField("");
        entryField.addActionListener(this);//ActionListener
        f.add(entryField);
        entryField.setBounds(160, 10, 220, 25);

        evaluate = new JButton("Construct Tree");//creating instance of JButton  
        evaluate.addActionListener(this);//ActionListener
        f.add(evaluate);
        evaluate.setBounds(137, 55, 130, 30);

        resutfieldlabel = new JLabel(" Infix Expression ");
        f.add(resutfieldlabel);
        resutfieldlabel.setBounds(20, 100, 100, 25);

        resultField = new JTextField("");
        resultField.addActionListener(this);//ActionListener
        resultField.setEditable(false);
        f.add(resultField);

        resultField.setBounds(125, 100, 220, 25);

    }

   @Override
   public void actionPerformed(ActionEvent e) {


    if (e.getSource() == evaluate) {
        String fullString = entryField.getText().trim();
        if (fullString.matches("\\d+") || fullString.matches("[-+*/]")) {
            Convert conversion = new Convert();
            resultField.setText(conversion.convert(fullString));
            eraseTextField();
        }else {
            JOptionPane.showMessageDialog(null,"Wrong input enter a digit or 
    arithmetic operator");
            eraseTextField();
        }

    }

}
    public void eraseTextField() {
        entryField.setText("");
        entryField.requestFocus();
    }

    public static void main(String[] args) {
        P2GUI p1GUI;
        p1GUI = new P2GUI();

    }
}

Convert. java class

package p2gui;

import java.util.Stack;

/**
 *
 * @author Mike
 */
public class Convert {

    /**
     * Checks if the input is operator or not
     *
     * @param c input to be checked
     * @return true if operator
     */
    private boolean operator(char c) {
        return c == '+' || c == '-' || c == '*' || c == '/' || c == '^';
    }

    /**
     * Converts any postfix to infix
     *
     * @param postfix String expression to be converted
     * @return String infix expression produced
     */
    public String convert(String postfix) {
        Stack<String> s = new Stack<>();

        for (int i = 0; i < postfix.length(); i++) {
            char c = postfix.charAt(i);
            if (operator(c)) {
                String b = s.pop();
                String a = s.pop();
                s.push("(" + a + c + b + ")");
            } else {
                s.push("" + c);
            }
        }

        return s.pop();
    }

}

Answer:

You can use regex to solve your problem, here is a simple example you can use it to solve your problem :

String str = "123";
if (str.matches("\\d+")) {
    JOptionPane.showMessageDialog(null, "Degit");
} else if (str.matches("[-+*/]")) {
    JOptionPane.showMessageDialog(null, "arithmetic operator( + - * /)");
}else{
    JOptionPane.showMessageDialog(null, "Incorrect input");
}

Explication

str.matches("[-+*/]") if your input is - + * or / then it will return true. str.matches("\\d+") if your input is a number then it will return true

Question:

I have Jtextfield, I want to format it, so that it should accept in the format below.

KYC123456L

Input will always start with "KYC" and ends with "L" and 6 numbers in between.

UI has a button that will copy the contents of other components and save it to a text file. But before it copies it should validate the jtextfield and copy if only format above matches, if not a message to be displayed.

Please suggest.


Answer:

Frame the regex: ^KYC[0-9]{6}L$ to match the pattern stated in your question.

It'll match the strings starting with KYC, then 6 digits, and finally ending with L.

NOTE: ^ marks the beginning of the string, whereas $ marks the end of the string.

String patternString = "^KYC[0-9]{6}L$";
Pattern p = Pattern.compile(patternString);
String test = jTextField.getText();
Matcher m = p.matcher(test);
boolean matches = m.matches();
if(matches == true)
  // allow
else
  // JOptionpane.showMessageDialog ---> your desired error message.

Question:

I'm trying to validate my program by entering a value through a JTextField on a JDialog and if it's less than a value..., else do ... I keep running into a problem on the line:

int intDiagInput = Integer.parseInt(dialogInput)

JOptionPane.showInputDialog(dialogPaneInput, "Age verification required, please enter year of birth: yyyy");

            dialogInput = dialogPaneInput.getText(); //get info from JTextField and put in string

            int intDiagInput = Integer.parseInt(dialogInput); //convert string to int

Any help would be greatly appreciated.


Answer:

Your code is wrong in two ways: The first paramenter you pass to showInputDialog is used as the parent, just for layout purposes, it has nothing to do with the actual content of the input dialog. Therefore your second error is getting the text from the displayed dialog. To get the text the users enters you need to write something like:

String dialogInput = JOptionPane.showInputDialog(dialogPaneInput, "Age verification required, please enter year of birth: yyyy");

int intDiagInput = Integer.parseInt(dialogInput ); //convert string to int

What you are doing is getting the text of some magical object dialogPaneInput, which probably is just an empty string.

Additionally you should check that the user inputs a valid number, not in terms of a number that you would accept but in terms of it actually beeing a number, otherwise you will run into the already existent NumberFormatException - or wrap the parsing in a try...catch-block.

try {
    int intDiagInput = Integer.parseInt(dialogInput );
} catch (NumberFormatException nfex) {
    System.err.println("error while trying to convert input to int.");
}

Question:

I was wondering if it is possible to add a JTextField to a ShowOptionDialog box.

     int optionChosen = JOptionPane.showOptionDialog(finishPayInput,     
     dialogPanel, "The Title", JOptionPane.NO_OPTION,      
     JOptionPane.QUESTION_MESSAGE, null, options , options[0]); 

When I run the program, the dialog box shows, but the JTextField doesn't display.


Answer:

You cannot add a textfield to the JOptionPane.showOptionDialog first Parameter is the parent component not a child component.

See the documentation:

public static int showOptionDialog(Component parentComponent, Object message, String title, int optionType, int messageType, Icon icon, Object[] options, Object initialValue) throws HeadlessException

Brings up a dialog with a specified icon, where the initial choice is determined by the initialValue parameter and the number of choices is determined by the optionType parameter. If optionType is YES_NO_OPTION, or YES_NO_CANCEL_OPTION and the options parameter is null, then the options are supplied by the look and feel.

The messageType parameter is primarily used to supply a default icon from the look and feel. Parameters:parentComponent - determines the Frame in which the dialog is displayed; if null, or if the parentComponent has no Frame, a default Frame is usedmessage - the Object to displaytitle - the title string for the dialogoptionType - an integer designating the options available on the dialog: DEFAULT_OPTION, YES_NO_OPTION, YES_NO_CANCEL_OPTION, or OK_CANCEL_OPTIONmessageType - an integer designating the kind of message this is, primarily used to determine the icon from the pluggable Look and Feel: ERROR_MESSAGE, INFORMATION_MESSAGE, WARNING_MESSAGE, QUESTION_MESSAGE, or PLAIN_MESSAGEicon - the icon to display in the dialogoptions - an array of objects indicating the possible choices the user can make; if the objects are components, they are rendered properly; non-String objects are rendered using their toString methods; if this parameter is null, the options are determined by the Look and FeelinitialValue - the object that represents the default selection for the dialog; only meaningful if options is used; can be nullReturns:an integer indicating the option chosen by the user, or CLOSED_OPTION if the user closed the dialogThrows:HeadlessException - if GraphicsEnvironment.isHeadless returns trueSee Also:GraphicsEnvironment.isHeadless()