Swing/AWT/SWT :: Endless Loop While Calling Dialog Box Via Separate JFrame Class In NetBeans IDE

May 2, 2014

I've used Netbeans IDE to create a simple Swing JFrame container, class NewJFrame.

NewJFrame calls another JFrame with dialog in it. Problem is there is an endless call made to it. Here's the issue relevant piece of code:

//Code for calling class
package p;
public class NewJFrame extends javax.swing.JFrame implements ActionListener {
.........
public NewJFrame() {
initComponents(); //IDE auto generated code for binding

[Code] ....

I searched but i cannot understand why run class is getting called multiple times. I have attached the screen prints for both the screens. 2nd screen print(of called class) is very shallow since screen was blinking unstopped due to multiple calls, but i have attached a faint image of it.

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Swing/AWT/SWT :: Print Numbers Ten Per Line And Separate By Exactly One Space In Dialog Box?

Feb 17, 2014

The question is Write a program that displays all the numbers from 100 to 1000, ten per line, that are divisible by 5 and 6. and separated by exactly a space.

My assignment requirements are to display this in Dialog Box / message box . I have written this code so far

import javax.swing.JOptionPane;
public class Exercise04_10 {
public static void main(String[] args) {
int count = 1;
for (int i = 100; i <= 1000; i++)
if (i % 5 == 0 && i % 6 == 0)

How to display the output in dialog box?

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NetBeans JFrame Form With Loop

May 14, 2015

I am trying to create an application in java with jframe form and i am also running certain code in for loop. Here is the trick. I want to stop the operation in the middle of for loop by click a button and start it again by click another button if we want.

My problem i can't do anything while the for loop is running.

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Incorrect Input Causes Endless Loop?

Aug 14, 2014

I'm making a program to demonstrate Exception Handling. (Note: the code was written inside towards out). The user is prompted to input two values (integers) and then the program will divide those values and output the result.

I then added the "try" and "catch keywords for exception handling-instead of the program shutting down if an error occurs, the words "you cant do that" will appear

I then added a while loop to allow the user another chance to input usable values. Of course, I made sure to make a termination to the loop as well.

Everything works as expected if the user inputs e.g 8 divided by 0. in that case exception occurse, the user is told "you cant do that", is then prompted to start over and so forth until he gives usable integers. then the program continues to the termination. However, if the user inputs a String , e.g 9 divided by xyz, then the program goes into an endless loop

My question is:

1) why does a String cause an endless loop ( I have a theory)

2)why does the loop occur as soon as I put in an incorrect value- is the while loop somehow in extant? somehow always waiting? (hard to picture it)

3) lastly, what would be the correct code to handle and exception caused by a String (as opposed to being caused by impossible to execute math)

Here is the program

package inschool;
/*
*GOAL: to allow for an exception to occur without causing the entire program to stop.
*NOTE: the coding was written from the center outwards (e.g first "System.out.println", then "try", then "do")
*/
import java.util.*;
public class L82_ExceptionHandling {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

[Code] .....

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Sep 10, 2014

I am developing a program in netbeans forms. I've got to a point where I will click a jButton to print the content of either JFrame or JPanel. I am using Netbeans forms to develop the project....

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Jun 22, 2014

I was learning looping in Java and decided to try this code and then I encountered an endless loop of 2s. why is that? I believe this line count=count++ caused it.

class ForDemo{
public static void main(String []args){
int count;
for(count=2;count<=5;count=count++)
System.out.println("count is:"+count);
System.out.println("Done!");
}
}

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Swing/AWT/SWT :: Java GUI With Separate Class For JList - Adding Items To The List?

Sep 19, 2014

I am trying to create a GUI interface in swing which consists of four classes: a GUI class, which creates a main JPanel, a label, and a JList, which it takes from the second class, a MovesList class that contains a JList and the stuff needed to interface with it. It also has a main class, which basically just creates an object of the GUI class for the main window, and an Other class from which I would like to be able to add an item to the JList. I created methods in the MovesList class to get each component (like getMoveslist, or getMovesListScrollPane), which I then used to create the JList in the GUI class. I also created an addMove method so that I can add an item to the JList from any class through a MovesList object. However, this addMove method only works when called from the GUI or MovesList classes -- it does nothing when I collect from the Other class.

Here is my code:

//Main class
public class TestProject {
public static void main(String[] args) {
GUI mainWindow = new GUI();
mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

[Code] ....

When I run this code, I get a window with a JLabel that says "Moves," and a JList that contains five elements -- test 1-test 5, but not a sixth "test from other class." ( using the add move method ) However, when I click on the window, the addMove method is also called, and successfully adds "test 6" to the list.

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Swing/AWT/SWT :: Using JFrame Class In GUI Designing

Jul 16, 2014

I have one question that suppose I am designing a Swing applications and I am using JFrame as Top level container.

So what is best

1)first Extends that class like

public class A Extends JFrame
{
//Do all stuff with Top Level container with gui
}

2)Or design like this from this source

[URL] ....

package components;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/* TopLevelDemo.java requires no other files. */
public class TopLevelDemo {
/**
* Create the GUI and show it. For thread safety, this method should be invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.

[Code] .....

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Swing/AWT/SWT :: Can't Change Visibility Of Two JPanels When Calling Method From Button Event In Another Class

Dec 30, 2014

I have two classes involved in this portion. CheckIn_Search

(class #1) is my main UI and I am collecting search information from the user in a jPanel form. When they click "Search" it passes the search criteria to a method that contacts a web service and gets the results. These results are passed to coSearchResults

(class #2) that opens a jFrame and jTable (in modal format, over the main window created by CheckIn_Search.

The user selects a row in the table and that selection data is passed back to coSearchResults to populate a new jPanel form. When the data is passed from coSearchResults, I want to close its window, hide the first jPanel in CheckIn_Search and make the second jPanel visible. To accomplish this, I created a method in CheckIn_Search that simply hides/shows the panels (it will do more later).

I instantiate and call the method in CoSearchResults as part of the button click event. The problem is, it doesn't work. The panels are unaffected and there are no errors. I've put in break-points and it goes into the method.. Here is the coSearch_Results code.

Here is am retrieving the jtable row id and using the first value in the row to get the data from the table model as there is more data than what is displayed in the table. I'm sending that whole row of data to the method that changes visibility.

private void btnOKActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnOKActionPerformed
// TODO add your handling code here:
int rowNum = jTable1.getSelectedRow();
String coNum = jTable1.getValueAt(rowNum,0).toString();
String[] text;

[code]....

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Swing/AWT/SWT :: Communication Between JFrame And Java Class?

Apr 19, 2014

I have a jFrame and a Java Class. Now i have a path of image in my jFrame which I want to display in java class(Crop2). I created an object in jFrame

Crop2 d=new Crop2();

and then I'm trying to send the data to the class file but it is not working.

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Using Jtextfield On Jframe (Swing) To Enter Search Terms In Different Class

Dec 4, 2014

I have a swing jFrame set up with a control group which contains 3 radio buttons.

When one is clicked it sends its label to a jtextfield in a different class i have code parsing text by a term

Java Code:

Scanner s = null;
try {
s = new Scanner(new BufferedReader(new FileReader("/Stage_One.txt")));
s.useDelimiter("*");
String total = (s.next());
Pattern p = Pattern.compile("[]+");

[Code] ....

I just need to know how to access the jframe variables (textfields, panels and such) so i can use their inputs in code to filter a text file.

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Apr 23, 2014

i am creating a desktop application. In this application, firstly there is a log in form. Now, i want to display the another form on the same window i.e by removing log in form a new form..

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Jun 22, 2014

So I have this line of code...

ioexception11.addChoosableFileFilter(new Jframe());

And when I compile it gives me...

error: constructor Jframe in class Jframe cannot be applied to given types;
ioexception11.addChoosableFileFilter(new Jframe());

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Jan 29, 2015

I know that I can declare and initialize an member variable inside a class in a single statement but I can't do them on separate sentence. Why?

For example, I am allowed to do the following,

class A{
int a = 5;
// rest of the class
}

But I am not allowed to do this,
class A{
int a;
a = 5; // it doesn't compile even when the variable 'a' is static
// rest of the class
}

Why java don't allow me to do that?

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Sep 5, 2014

I've been into java for about 4 months now, No complaints so far, it's pretty awesome! So I understand Polymophism pretty good, I did some Animal classes and it worked out neatly.

However. I just can't seem to find my way in OOP when trying to implement in on a Calculator Class I wrote. As you mind know, a calculator can be separated into many classes. But I actually just want it to be separated into some OO like: | Calculator | CalcGUI | CalculatorFunctions | CalcRun.

I tried separating the single Calculator class, however, my calculator Buttons didn't work after that, anymore..

here is my code:

import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.Button;
import java.awt.Menu;

[Code] ....

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Mar 6, 2015

My program crashes every time I call this method because of the while loop. I guess its going into a infinite loop. The game should keep running until the user ends it. Is the use of my .isKeyPressed correct and if so what else could it be?

public static void run() {
while (true) {
if (StdDraw.isKeyPressed(KeyEvent.VK_Q)) {
break;

[Code] ...

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Jul 16, 2014

-I created the project with the checkbox "Create separate folder for sources and class files."

-I've tried running the program with the "mfq.txt" file in the root directory, the src directory, and the bin directory.

-I've even tried it in all three directories at once!

-I've also refreshed my project after each change in eclipse

-My error is the "FileNotFoundException" error

Here is the line giving me trouble

Scanner file = new Scanner(new File("mfq.txt") );

Where my code is wrong/where I should put my file? :tax:

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May 28, 2014

Regarding the lifecycle of servlet , in headfirst servlet i can find :

You normally will NOT override the service() method, so the one from HttpServlet will run. The service() method figures out which HTTP method (GET, POST, etc.) is in the request, and invokes the matching doGet() or doPost() method. The doGet() and doPost() inside HttpServlet don’t do anything, so you have to override one or both. This thread dies (or is put back in a Container-managed pool) when service() completes.

How can I call the doGet method of the subclass from the superclass. i am not getting this .

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Feb 2, 2015

I have a problem with multi threading calling with for loop. I have those two and many other classes in one jar file but n 2 different packages.

When i execute the jar file first runs the Aclass, from where i try to run multi threads. From the run() of the class RunTheGame i call many other classes which are in the same package. Like you can see from the for loop is executed the threads.

The problem is that when the second thread starts the first one is stopped this happens for all the threads, more simply when a new thread starts the old one is dead.

It seems that liken the threads uses the classes called from run() of the class RunTheGame as non multi threaded. It gives this error:

Java Code:

Exception in thread "Thread-0" java.lang.NullPointerException
at thePackage2.EClass.getWhiteRemaining(EClass.java:49)
at thePackage2.EClass.isFinal(DClass.java:84)
at thePackage2.Spiel.<init>(Cclass.java:76)
at thePackage2.RunTheGame.run(RunTheGame.java:198)
at java.lang.Thread.run(Thread.java:745) mh_sh_highlight_all('java');

All the above refereed classes are called from the from run() of the class RunTheGame . Like i understand all the threads use those classes as non thread autonomous classes.

Java Code:

public class Aclass {
private static Thread t[];
public static void main(String[] args) throws IOException {
for (int Game = 0; Game< 10; Game++) {
t[Game] = new Thread(new thePackage2.RunTheGame(aplayer, bplayer, Name, ID , Pmach));
t[Game].start();

[Code] .....

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Aug 11, 2014

i am having a problem while calling a method..i am having a class

Java Code:

public class MySer implements Runnable {
public void getMessage(String msg)
{
...,
}..,
} mh_sh_highlight_all('java');
i use the above class in another class

[code]....

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May 20, 2015

In the process of creating a new class, I need to move my main method from the class SaveDate to the class DynamicTest. Below I have listed the code of both classes.The objective is to be able to run my program from the DynamicTest Class. I need understanding the process of moving my main method to a different class and creating an Object of a class and calling its method.
 
public class SaveData { 
  private static final Map<String, Object> myCachedTreeMap = new TreeMap<String, Object>();
   public static final List<String> getLines(final String resourceParam, final Charset charset) throws IOException{
  System.out.println("Please get: "+resourceParam);
  if (myCachedTreeMap.containsKey(resourceParam) ) {
  // Use the cached file, to prevent an additional read.

[Code] ......

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Apr 1, 2015

This assignment uses the following description to implement a Dialog class for the Leap Year Problem. We need to decompose this problem into 2 classes:

1.The Date.java class: is a public class that represents a date composed of a month , day, and a year. So you need to declare month, day, and year as integers. Date has 1 constructor and 4 methods. Write the constructor for Date which has 3 parameters: int m, int d, int y ; (As an example of a constructor with 2 parameters for example chapter 3 page 152 code listing 3-13 has a perfect example for you to use which is the BankAccount.java.) and the 4 methods:

"dayIs()" which returns a day. It has no parameter.
"monthIs()" which returns a month. It has no parameter.
"yearIs()" which returns a year. It has not parameter.
"isLeapYear()" which returns a boolean value.

"isLeapYear()" has one parameter year and returns a boolean. Write the method isLeapYear() knowing that a year is defined to be a leapyear it is a multiple of 4, and if it is is a multiple of 100, it must also be a multiple of 400. isLeapYear() thus decides when a year is a leap year. (see the discussion on "Hints for Assign5" to discover specific examples of a LeapYear).

The purpose of the Date.java is to decide whether a year is a leap year. Here is a definition of when a year is considered a leap year :

-year y1 is a leap year if it is multiple of 4.
-year y1 is a leap year if it is a multiple of 100, it must be a multiple of 400.
-Otherwise y1 is not a leap year.

2. The DateJDialog.java class: implements the GUI. Please use the Dialog boxes developed in the book in chapter2 in pages 99-100 in the code-listing 2-32 (NamesDialog.java) for input and output.

Remember that you will prompt the user to enter:
-a month;
-a day;
-a year

And out of these 3 you will be able to create a Date. Then you will use the dialog box to tell the user whether the year entered was a leapyear or not a leapyear.

Remember that we defined in 1- what it means a year is a leap year or not a leap year.

Do not forget to compile the 2 java files. To verify that the DateJDialog.java works, in TextPad after you compile DateJDialog.java, Click on Tools, Click on "Run Java Application".

When you have completed the assignment, please remember to submit Date.java and DateJDialog.java.

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Swing/AWT/SWT :: Multiple Values In Dialog Box

Feb 20, 2014

The below program ask the user to enter the value of x 1 , Y 1 and radius in separate boxes , What would look nice is if the user can Enter the Value X ,Y and radius in the same box.

import javax.swing.JOptionPane;
public class C3E29GeometryTwoCircles {
public static void main(String[] args) {
// Ask the user to enter the x1 coordinate.
String strNumber = JOptionPane.showInputDialog("Enter the value of x1 coordinate " );
double x1 = Double.parseDouble(strNumber);
strNumber = JOptionPane.showInputDialog("Enter the value of y1 coordinate " );
double y1 = Double.parseDouble(strNumber);

[code]...

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Aug 31, 2014

// Add range to Vehicle.
class Vehicle {
int passengers; // number of passengers
int fuelcap; // fuel capacity in gallons
int mpg; // fuel consumption in miles per gallon

// Display the range.
void range() {
System.out.println("Range is " + fuelcap * mpg);

[Code] ....

I'm compiling it in Eclipse and this continues to show in the console display

Minivan can carry 7. Exception in thread "main" java.lang.NoSuchMethodError: Vehicle.range()V
at AddMeth.main(AddMeth.java:34)

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Oct 20, 2014

I need to validate an input box so that the user can enter only round numbers.

The user can't enter any other characters except 0 to 9, they shouldn't be able to enter decimal points either.

They would be answering questions like, 'What is 7 times 8?'

Also, I need to validate it so that the program doesnt crash if they leave the input box blank or empty.

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Aug 9, 2001

I am wondering how to do the following:when a user clicks on a save menu item, a save JFileChooser pops up. I would like to have a default file name set in the FileName box on the chooser, similar to what applications like Microsft word has. Right now, no file name will appear until the user has selected a file.I also need to know how to get the text from this box in the case that the user enters a new file name (the getSelection function is not useful here because the user will not have selected an existing file.)

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