I have a jsf page.i need to confirm one filed only contain double value.how to validate this? I checked and found there is a validateDoubleRange,but its not suitable for this.
View RepliesIs it possible to validate the input of a TextField that ist bound to a Property before both values are updated? Following is an example of my problem .....
In my model, there is a SimpleDoubleProperty discount. As you can see, there is some validation logic in the method setDiscount that might be used by other parts of the model.
public class Model {
private DoubleProperty discount = new SimpleDoubleProperty();
public DoubleProperty DiscountProperty() {
return discount;
[Code] ....
My Main class has a Textfield that is bound to the discount-property, a button to put the current value of the discount-property to console and a button to call the setDiscount-method ......
public class Main extends Application {
@Override
public void start(Stage primaryStage) {
try {
Model model = new Model();
BorderPane root = new BorderPane();
Scene scene = new Scene(root,100,100);
[Code] .....
By using the bidirectional Binding between the TextField and the discount-Property, the setter in the model is never called and therefore there is no validation of the input value. When calling the setter programatically with the second button, everything works as expected.
I experimented with neglecting the Binding and using ChangeListeners for both the TextField and the discount-Property but only produced infinte loops when both listeners triggered each other alternating.
This is the code I have written so far. This program calculates tax from multiple tax payers.
import javax.swing.JOptionPane;
public class CalcutateTax
{
public static void main (String [] args)
[code]....
The problem is I cant think how to ask the use if he wants to calculate tax due for another taxpayer. If the user says yes, keep calculating, otherwise exit from the program. And how do I keep count of how many people got their tax calculated? Say for example,
JOptionPane.showMessageDialog (null, " We calculated tax for " + xnumber + " number of people.");
This is the question asked on my assignment ask the user if he wants to calculate the tax due for another taxpayer if so, do it again.At the end of the main method, output a message in a dialog box that says: Hello, We calculated taxes for [number of taxpayers].replace [number of taxpayers] with the actual number of taxpyers you calculated taxes for.
I just wrote a simple servlet with a doPost() implementation (no doGet()).
I fill out a simple HTML form with one textfield and two radio buttons. When I press the submit button, it takes me to my servlet that prints out my submitted name and my radio button choices. So now my browser is sitting at the servlet URL with the results on the page:
name: Ryan (text field)
year: Second Year (radio button)
specialization: Application Development (radio button)
What exactly happens when I press F5 on this page and I say 'Yes' to Chrome's "Confirm form resubmission"?
I was surprised, because the browser remembered my previously entered request parameters, when I know that these should be destroyed upon exiting the servlet's HTTP method.
So, this is what I assume: What the resubmission does is re-enter exactly the same request parameters back into the previous form and it hits the submit button for me, which brings me back to the page of the servlet (/Choice).
I'm not sure, what happens on forced form resubmission (F5)?
We are currently trying to use the "confirm" button on our GUI as a fully functioning feature that saves the data input into a database. Here is the code for the GUI we have created...
We are trying to save some details of users for a database.
I've attached our work in zipped folder as i couldn't upload a thread with some many "URLs" .....
I've come across a piece of code and I am totally baffled by how a certain field is being incremented.
public class Foo{
private static int counter;
private final int id = counter++;
public int id(){return id;}
[Code] ....
Now. The output for this is:
0
1
2
3
4
I understand all the code in it quite well. It's all basic. Containers, generics, looping, foreach loop. What I DON'T understand though is how on each iteration of the foreach loop, the call to the method id() returns an incremented number. I am assuming it has something to do with the field "counter" in class Foo being static because when I made it non-static it didn't increment. I must have missed something way back when I started learning Java because I just don't get it.
The id() method only returns the value of the id field in class Foo and that is the value of counter++. counter is not initialized, though I'm guessing it gets the default 0 when the Foo() constructor is run? Or do statics get initialized BEFORE the constructor is even run? Anyway. How does calling the id() method cause an incrementation? I'd understand if there was some code that tracked the number of Foo objects being created and incrementing for each one, but I cannot see how each time the id() method is called it returns an incremented value.
i need to develop a java program in which it will ask the user "Username" and "Password" and by which it will login to a wesite.
I have developed a GUI in which the username should be entered in the User "JTextfield" and Password in Password "JPasswordField". I need to make sure that password should not be displayed in the GUI. but I didnt find a way to parse the string (char) entered in the "JPasswordField" to the website.
It is always passing a 'null' character! I tried to search in internet and i found that it wont be able to pass the passwordfield characters but you will be able to check in the main function itself by comparing with another char array in the main program itself whether the password entered is correct or not.
Is there any alternate way for this?
Objective : Parse the password (which is not displayed in the GUI) to a website or some other function where it will use it
I have a PDF file and I have a text file that contains this data. It has the name of a PDF field along with a database table column name.
Text file: pdfFieldEmployee=Employee; pdfFieldStartDate=StartDate; pdfFieldSalary=Salary; pdfFieldExempt=Exempt
I also have this hash map that contains the database table column names along with their corresponding values:
Employee, Don Parker
StartDate, 5/6/2000
Salary, $55000
Exempt, N
How would I read through the text file and the hash map and at the same time do this:
if the pdf field is equal to pdfFieldEmployee, then set pdfFieldEmployee equal to Don Parker.
if the pdf field is equal to pdfFieldStartDate, then set pdfFieldStartDate equal to 5/6/2000.
and so on and so on. I would prefer to do this with a loop because I think it would take less code than writing a bunch of if statements.
I was given the assignment to make script so that is will fill an array with random numbers using "recyclable" parts.
So my script is:
import java.util.*;
class eser_ha_dibrot_4 {
public static void main(String[] args) {
int []a=new int[10];
fill(a);
[Code] ....
And I get this error: "random cannot be resolved or is not a field"
what to do?
I have a question about JTextArea colors. When i set the color to blue and then write something on the JTextArea (JTextArea.append) and then set it back to black everything will be black. How can i solve that? Like in Notepad++ or Eclipse when you write keywords in a JTextArea (where you write your code) only some words change color.
This is my code:
// All the imports
public class whatever extends JFrame {
JTextArea a = new JTextArea();
public whatever() {
super("Title");
add(a);
[code]...
I need to fill up 1/10th of the board with mines but i am only able to successfully put 1! also my goal is not showing up on the game even though i put it as an up arrow.
package Homework4;
import java.util.Random;
import java.util.Scanner;
public class HW4 {
//Creates a new type to be used to create the board
[Code] ......
we have an Arraylist<Tweet>, and this class is defined as followe: public class Tweet implements Comparable<Tweet>, Serializable. now if we implement the method comparteTo, then will it be sorted automatically? I want to sort this array by any insert.
View Replies View RelatedI'm trying to figure out a good way to allow my users to have some formatting options within a text box in my application. Ultimately, they need to be able to have text that is alternating between two separate fonts, and ideally could have both italicized and bolded words as well.
View Replies View RelatedI think the following code should trigger a compiler error.
public final class IPoint3D {
private double x;
private double y;
private double z;
public IPoint3D(double x, double y, double z)
[Code] .....
I've been using Eclipse and I realized that it compiles stuff into class files for you. So, I created a new project and each class is a separate .java file, with the .class files already there, but I cannot get rid of these errors. Or, say if I wrote them all into one file and then realized it needs to be 3 separate, or that all need to be in the same src file (oops)? Here are the errors:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
random cannot be resolved or is not a field
guessp1 cannot be resolved to a variable
guessp1 cannot be resolved to a variable
guessp2 cannot be resolved to a variable
guessp2 cannot be resolved to a variable
guessp3 cannot be resolved to a variable
guessp3 cannot be resolved to a variable
guessp1 cannot be resolved to a variable
guessp2 cannot be resolved to a variable
guessp3 cannot be resolved to a variable
[code]....
I didn't work a lot with Reflection and now I'm having troubles by writing a method to set a field value of an unknown type.
I wrote a little example program to show, where I cannot find a solution. I explain the problem in the following points:
- there is a class with 4 fields, which 2 are of type primitive int and 2 are Integer
- at line 27 is set the name of the field I want to modify
- if is set field1 or field2 (of type int) there is no problem. In this case the 'case "int"' of the following switch is executed
- if is set field3 or field4 (of type Integer) is executed the 'default' case of the following switch and at line 56 is thrown the cast exception that "Cannot cast java.lang.String to java.lang.Integer"
import java.lang.reflect.Field;
public class TestClass {
public int field1 = 1;
public int field2 = 2;
public Integer field3 = new Integer(3);
public Integer field4 = new Integer("4");
[Code] .....
consider:
class A {
final Object b;
public A(C c) {
try {
b = c.someMethodThatMayThrowSomeException();
} catch (SomeException e) {
b = null; // This line results in compiler error: "variable b might already have been assigned"
}
} // take away b=null line and you get "variable b might not have been initialized" on this line
}
Why? How could 'b' be assigned if the exception was thrown?
Btw, the workaround is to wrap the method call:
private final Object initB() {
try {
return c.someMethodThatMayThrowSomeException();
} catch (SomeException e) {
return null;
}
}
and use b = initB(); in the constructor. But that seems like it should be unnecessary.
I'm just putting together a little 'horse racing' program while I'm learning Java, and I have a class called Race that creates an array list of thorougbred horses called field, and asks the user to enter then names of the each horse in the field, with a maximum of 14 horses. The problem occurs with the current code that I have:
import java.util.*;
public class Race {
RaceHelper helper = new RaceHelper();
ArrayList<thoroughbred> field = new ArrayList<thoroughbred>();
public void setField() { //enter the horses in the race and determine the size of the field
[code]....
the statement of the index position and current size was for me, so I could see what was going on.What I don't understand is the while loop. not that the class doesn't compile and run (you can see that it does), it's the output. Why does the <= sign allow one more entry and increase the size of the field to 15?
Less than or equal to 14 should give a maximum field size of 14, right, With the starting object at index position at zero and going up to 13, for a total size of 14 thoroughbred objects if I just use while (field.size()<14) or a for loop, then the output is fine; it allows a max of 14 entries and prints the results. I thought it had something to do with the size being zero based, but that doesn't seem to matter -- unless it does matter and I'm missing it. why the comparison I'm using produces this output? a field of 14 horses shouldn't matter whether it's zero or 1 based, as long as the size of the field is 14, so why the extra entry with this while condition?
Coding to show pop when focused on any button or text field...i want to show inf pop when we take mouse cursor on any button or field..want coding to be written in action performed in netbeans....
View Replies View RelatedI want to display a new panel with a text field and a label in it, and add the text from that textfield to an array list each time i press enter. here is what i am trying to do:
public JPanel startStateNoPanel(){
startStateNoPanel = new JPanel(null);
startStateNoPanel.setBackground(Color.YELLOW);
stateNo = new JLabel();
stateNo.setText("Enter Start State Number: ");
stateNo.setBounds(5,40,200,20);
[Code]...
Here is my method to add Panel to Action Panel which is further added to the Frame
public void addPanel(JPanel panel, String name){
ActionPanel.add(panel, name); // there is the card layout on action panel
}
symbolCountPanel is a panel which consists of a text field to take numberOf alphabets
if((symbolCountPanel.isShowing()) && (ex.getSource() == symbolCountF)){
if(!isTextFieldEmpty(symbolCountF)){
new SwingWorker<Void, Void>() {
protected Void doInBackground() throws Exception {
AlphabetCountF.setText(symbolCountF.getText());
setNumberOfAlphabets(Integer.parseInt(symbolCountF.getText())); // setting Number of Alphabets
[Code]....
I am trying to retrieve jtext fields and combo box values from another frame and to put them in database but .getText() doesn't return anything ...
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
String sql = "select * from login where uid = ? and pass = ?";
pst = con.prepareStatement(sql);
pst.setString(1, jTextField1.getText());
pst.setString(2, jTextField2.getText());
rs = pst.executeQuery();
if(rs.next()){
[Code] .....
So basically I have this alpha.dat file which stores data submitted when I execute the alpha class and here I have a AWT textfield which reads a password from user. I have another class called beta and I have another AWT textfield in it which also reads the same password from user. How do I compare both passwords?(I know I need both classes to refer to alpha.dat but how do I compare both textfields in different classes)
View Replies View RelatedSo I have been given this code, below:
public class Person{
/*Complete*/
public String format(){
return String.format( "Name: %s", name );
[Code] ....
And I have been asked to add a new field called name, and call the display method in the main. I need to use an appropriate type and privacy for the name field, and once the code is finished, I should see 'Harry Potter' appear on the command line. However I don't know what it means by field. I've tried googling it and one search result said it is a field parameter, and another search result said it was something completely different, and I don't know which one it is. I've created a parameter 'Private String name;' but it only prints out 'name: null'
This is the code I wrote but it obviously doesn't work?
package Practical8;
public class Person{
Private String name;
public String format(){
return String.format( "Name: %s", name );
[Code] ....
I just want to add a text field and a label next to it that says "Hourly Wage".
Also, when I run this in Xcode, it reports back with "Shell Script Invocation Error" "Command usr/bin/java failed with exit code 1".
Here's my program:
package summerIncome;
import java.util.Scanner;
public class SummerIncomeCalculator {
public static void main(String[] args) {
jFrame frame = new Jframe("Summer Income Calculator");
frame.setSize(400,300);
[Code] .....
I have an bean vacationRequestBean with startdate and enddate of date field. I used jquery date picker in my index.xhtml for those fields. format is MM-dd-yyyy for date picker
<script>
$(function() {
$("#datepicker").datepicker();
});
</script>
and in xhtml
<h:inputText id="date" class="datepicker" value="#{vacationRequestBean.startdate }" >
<f:convertDateTime pattern="MM-dd-yyyy" type="date />
</h:inputText>
<h:inputText id="date" class="datepicker" value="#{vacationRequestBean.enddate }" >
<f:convertDateTime pattern="MM-dd-yyyy" type="date />
</h:inputText>
I am getting error as "<f:convertDateTime > Parent not an instance of ValueHolder". How to store the value selected using jquery date picker to bean on submitting the form.
I want to use this class and method with all of my buttons and text fields. My program contains 1 push button that adds questions and answers to a test, 2nd button that starts a test, a 3rd button that scores the test, and a text field that enters the user information. How would this work? I know how to create questions and answers, start a test, and score a test it's just a matter of how to implement the button and text fields. I'll post the code that I have done so far.
See:
private class ButtonListener implements ActionListener{
public void actionPerformed (ActionEvent event)
with all of my buttons and text fields.
import javax.swing.JFrame;
public class TestingDriver
{
//-----------------------------------------------------------------
// Creates and displays the main program frame.
//-----------------------------------------------------------------
public static void main (String[] args) {
JFrame frame = new JFrame ("Testing Program");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
[Code] ....