problem about joptionpane-Collection of common programming errors

12 years ago
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5 minutes

  • user3055240
    java swing combinations permutation joptionpane
    I was able to program this, and I don’t have any errors that I can see, and it even displays the gui. I’m pretty sure I assigned the buttons properly. But the GUI is temperamental, and when I run it, it displays but sometimes the insides of the gui disappear when I enter values. But it calculates nCr, just not pCr.I have a driver class. Pretty sure it’s implemented properly. Here’s my panel class. I’m wondering what’s wrong and why the GUI doesn’t function properlyI realize this is a lot o

  • Jayaprasad
    java swing joptionpane jdialog non-modal
    I have a non-modal dialog with two input text fields shown with the JOptionPane with OK and CANCEL buttons. I show the dialog as below.JTextField field_1 = new JTextField(“Field 1”);JTextField field_2 = new JTextField(“Field 2”);Object[] inputField = new Object[] { “Input 1″, field_1,”Input_2”, field_2 };JOptionPane optionPane = new JOptionPane(inputField,JOptionPane.QUESTION_MESSAGE, JOptionPane.OK_CANCEL_OPTION);JDialog dialog = optionPane.createDialog(null, “Input Dialog”);dialog.setModal(fal

  • Emmanuel Bourg
    java dialog joptionpane
    I’ve just tested a little code examples from a book:JOptionPane a = new JOptionPane(); String aName = a.showInputDialog(“What is your name? :”);This piece of code opens the dialog box and after 3-5seconds suddenly have been closed. This happens with different dialogs (for example, open_file dialog).Why does it close?PS: I use WinXP prof SP3, jre1.7.0-ea-b113.

  • Karthik T
    java if-statement joptionpane
    I’m a beginner, so this result I am getting for one condition of my if else statement is blowing my mind. Everything works properly except for the condition when the QtyCalc variable is >= 100. The Finprice variable is listed as the disc variable and I can’t figure out why. Help? import javax.swing.JOptionPane; public class SoftwareSales {public static void main(String[] args) {final int price = 99;String Qty;double QtyCalc, preprice, Finprice, disc;Qty = JOptionPane.showInputDialog(null, “Ho

  • Andrew Thompson
    java process joptionpane runtime.exec
    I have this code:import javax.swing.JOptionPane;class OpenProgram {public static void main(String[] args) throws Exception {// opens the JOptionPaneString path = JOptionPane.showInputDialog(“Type the path to a program or other file(forward slashes)”);//runs the programProcess run = Runtime.getRuntime().exec(“\”” + path);System.out.println(“Program Opened!”);run.waitFor();} }It is supposed to bring up a JOptionPane and have the user type in the path to a program, then run the specified program, b

  • Eogcloud
    java class constructor joptionpane
    Just a really quick question about something small. The following is part of a programming assignment for my programming 2 class. It focuses on inheritance and multiple classes. I’ve answered the question but want to consolidate the classes into a main function and actually build something rather than just submitting the bare minimum.My question is the section of code below. The user runs the program, is presented with a dialog asking him as to what he’s like to add (a CD or a Movie, they’re bot

  • kleopatra
    java swing jframe actionlistener joptionpane
    Basically I have a GUI that inherits from the JFrame class and has its own main method.It gives the errorException in thread “main” java.lang.NullPointerExceptionat MilesPerGallonApp.buildPanel(MilesPerGallonApp.java:33)at MilesPerGallonApp.<init>(MilesPerGallonApp.java:20)at MilesPerGallonApp.main(MilesPerGallonApp.java:58)Here is the source codeimport javax.swing.*; import java.awt.event.*;public class MilesPerGallonApp extends JFrame {private JPanel panel;private JLabel messageLabel1;pr

  • Ut My
    crash windows-7-x64 joptionpane halt eclipse-kepler
    I have researched thoroughly on this problem but no use. Hopefully you guys can help me. Thanks very much in advance!The test code is below:import javax.swing.JOptionPane; public class JOptionPane_Test {public static void main(String[] args){String userExit=”a”;while (userExit!=null){userExit = JOptionPane.showInputDialog(null, “Message”);}} }It simply displays an input box waiting for user’s response, repeats if user hits OK, and stops if user hits Cancel or X button. The box halts after a rand

  • Steve
    java eclipse double joptionpane
    So I am working on a program for school, and part of the assignment is to have a bunch of prompts for input pop up. I am using the JOptionPane, which inherently has an OK button and a Cancel button. Now, to make the program exit when they press cancel when the prompt is asking for a string, I have something like this: firstName = JOptionPane.showInputDialog(“Please enter your first name:”); if(firstName == null)System.exit(0);But I also have to do the same thing for numbers I get as input, both

  • moskalak
    java swing joptionpane xtend
    I realize it might be a very stupid question, but how do I use JOptionPane with Xtend? I can’t figure it out and I’ve been trying to get it working for a while now.JOptionPane.showMessageDialog(getContentPane(), message); doesn’t seem to work.Eclipse gives me this error: The method or field JOptionPane is undefined for the type MyClassName

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