public void actionPerformed(ActionEvent actionevent) {if ( textField.isFocusOwner()==true){if(textField.getText().equals("Please input text") )textField.setText("");}}But TextField get focus by pressing "Enter key".How could i use mouse to get focus in TextField?Thanks a lot ...

How can I determine if a user has closed a JInternalFrame? My Frame is a separate class outside the main class.Thanks

I need something like "value change listener" that immedialy call a function as soon as the value of i element of global array/vector changed. What should I use? Please help. Thank you.

hi to all i m beginner in java programming and i want to do event handling on mouse click. i have a buttonJButton btnclose = new JButton("Close");//in main areabtnclose.addMouseListener(this); //in main area then after the main block i have this codepublic void actionPerformed( MouseEvent e ) ...

hi to all i m beginner in java programming and i want to do event handling on mouse click. i have a button and i want if i click that button a new window open can anyone help me

I wrote the code in this way.public void tableChanged(TableModelEvent e) {int row = e.getFirstRow();String olduse=null;int column = e.getColumn();TableModel model = (TableModel)e.getSource();String columnName = model.getColumnName(column);String data = (String)model.getValueAt(row, ...

Hi,I am using jdk1.4 for my application development. I am getting following exception at runtime. Any idea how to fix this problem? Thanks,Ushajava.lang.NullPointerExceptionat javax.swing.plaf.basic.BasicTreeUI.paintRow(Unknown Source)at javax.swing.plaf.basic.BasicTreeUI.paint(Unknown ...

I am working on a legacy Java App that was written in the 1.1 era. We have recently upgraded enough components and keywords so that the applet is now compiling and executing under JDK 1.5 but it seems that the CTRL + Mouse click action is being masked as a SHIFT + Mouse click on our table ...

Hi,I am using a keylistener on a JTextField. Whenever the user types something in the textfield, the keylistener picks it up and shows it on a label, dynamically. The problem is that when the user hits backspace, the keylistener picks that up and shows it in the label as a special character (a ...

Hi, I want my JDialog to setVisible(false) when user presses Esc key. I've tried two ways but failed to make it.Method1:this.addKeyListener(...);// this method doesn't work at allMethod2:this.getRootPane().registrKeyboardAction(...), and I put this.setVisible(false) in the event handling ...

I have a problem with CTRL+C, CTRL+X, CTRL+V keystrokes.I have defined actions for this shortcuts but they are never triggered.This shortcuts have normal window behaviour, it means that CTRL+Ccopied selected item to clipboard instead of performing defined action.If I change it to some other ...

Hi Guys how are you doing?I developed an JApplet which is drag and drop enabled to upload local system file to server. In this JApplet in addition to DRAG and DROP i am trying to add PrintScreen image copy on to the applet. I did everything like getting the clipboard image and creating a image ...

hi,i am coding a GUI application for some FSM(Finite State Machine) simulation purpose. the app can load the FSM and display it. i can selecte some part of FSM and using "delete" key to delete the selected states. i did register the KeyEventListener to the the JFrame. but when i try to press ...

hi,I am drawing a couple of images using Graphics.drawImage() in the paint() method in my JApplet that i registered a MouseMotionListener. I update global xCoordinate and yCoordinate attributes of my applet and call repaint() in mouseMoved() method. Inside paint() method, i check if the mouse ...

Hi. This is my first posting here, though i cannot find anything on the web or these forums to help.Scenario:I have a JTable in my GUI, and the users wants to be able to do all the cell input via the Numpad. Thing is, an API i am depending on, does not like it when someone uses "," (comma) for ...

I have been playing with reflection answers to the question of how to handle ActionEvent events in Swing... like using a single instance of one member class as a reflection switch:private class Listener implements ActionListener {public void actionPerformed (ActionEvent action) {try ...

Hi all:i want to use user-denfinded compnets to recieve user-definded events,how can i achive it or who can give me some hints?Thanks for your help.

I want to add Event functionality to my Table which is a subclass of JTable in order to be able to edit the JavaBean values displayed in the Table. I used the addTableModelListener() method but it does not compile here.Please see the link to get an idea of what I am trying to ...

HelloI posted this question in new to java, without much response. Hoping for more here.I have a class (tm) that implements TableModel. Another class show the JTable using this tablemodel. In the JTable user can change the Strings that is returned by the tm.getColumnName(int col), and I was ...

The default behavior of the event dispatch thread in response to an uncaught exception is to print a stack trace of the exception and then terminate (a new event dispatch thread will start in its place when more events are generated). I found this out from reading the source code comments ...

Hi allI have a JToolBar with some Actions (classes that extend AbstractAction) and I would like to associate shortcut keys to those Actions, something like ctrl + n to open a new window. How can I do that? Any pointers or ideas would be welcome.

if let say my comboBox got "A","B","C"...then i got name field and ID field.how can i make it where the comboBox "C" is choosen and it will record down?so that when i open that particular record back..it show "C"i can save the name and ID but do not know how to save the content of ComboBOx ...

i got a collection of data in table cell...then i got button of deletehow can i make it when i click the particular cell data at the table and then click button delete,the particular data that i wan delete will delete?how to make the delete button know the cell i clicked is the thing i wan to ...

Hello I am doing program with a driver class that accesses programs and a web site. What event handling code do I need to accessa web site when I press a button?I have in my actionPerformed() methd:ActionListener myActionListener = new ActionListener() {public void actionPerformed(ActionEvent ...

i m trying to create a custom class (extending java.awt.Rectangle)which responds to mouse gestures.i m using it as an object on my drawpad which responds to mouse behaviorlike rollover.the rollover color change is achieved using canvas' graphics object triggerd by my cutom classi m not able to ...

Hi,I'm new to swing development, here is my problem.I have a JRadioButton with an itemListener, the listener works fine and it do what it have to do but i need to access to it and to change it's selection mode with the setSelected(boolean b) method and not just with the mouse... and of ...

Hello everybody, I want my JFormattedTextFields to select all of their content on focusing. While this is no problem with normat JTextFields, the formatted ones don't respond to slectAll(). I found the a workaround, but an ugly one: it works if I first change the content of the Field: ...

Hi all!I'm kinda new to Java, and I need some help.I want to block the maximize option for my window, is that possible?It's more a stylish problem, really, 'cause when the window is maximized the whole format disapears and the pictures get mixed with the text, and stuff like that. And I want ...

Well, if u copy something from the textarea and paste agin on the textarea it does not respond.How ever, if u paste somewhere else on the system it works perfectly.please....help..and one more thing can anyone tell me how u underline something in JTextArea and also superscript...any help wud be ...

Hi all,While writing some code that would override the method 'processKeyEvent' in JComponent, i needed to find a way to know of which type (e.g. pressed, typed of released ) a fired keyevent was. I thought i found it in the 'getKeyEventType()' method of AWTKeyStoke (see code below), but ...

Hi, i'll try and keep the code to a minimum. My assignment (at UNI) is to create a JUG Program (Java Ultimate Graphist) which works like a paint program.So far ive done most of it. But im having problems with combo boxes. Basically its required to have a combo box at the bottom where you ...

How can I inherit setActionCommand for JButton and overload it? I want to make a new setActionCommand with more parameters, but I couldn't figure out how to do it. For example, the default method parameter is:setActionCommand(String command);I want it to do something like ...

Hi i am trying to work with KeyListener in a JPanel which is called from an applet. But i am unable to get any key events on the panel. Here is the code of sketch so that when one clicks on arrow keys it draws shape on the Panel. Can any one help me where is the problemimport ...

Hi all,I'm creating an application by using the J2SE v 1.4.2_10 SDK with NetBeans 4.1 Bundle. I have created 4 button and handles event each. I would like to create a hotkey for each button, "F2" key for jButtton2, "F3" key for jButton3, "F8" key for jButton4, "F1" key for jButton5, once i ...

Below is my code to separate GUI and application code. When i try to execute the code i get message applet not initiated. Can any one point what mistake i am doing in the code. import javax.swing.*;import java.awt.event.*;import java.awt.*;class ColorAction extends AbstractAction{public ...

Hi,I have a clss with the following code -public class ABC extends JFrame implements ActionListener{String myAge;JButton jb;JTextBox ageInput;In the constructor,//Create panelspublic void actionPerformed(ActionEvent e){String name = (Strng) ...

I need to use use the elements package to draw a picture and colour it in. Unfortunately this package doesnt let you just draw a triangle you have to define 3 lines. I can do this but then i need to colour it in and im not sure what im doing wrong. Im pretty sure that im just getting something ...

This is my code:import element.*;import java.awt.Color;public class jonesp_assign1{static DrawingWindow d;public static void main(String[] args){d = new DrawingWindow(800,800);int i;for(i=1; i < 4000; i = i + 20){sky();tree();bush();road();sun(i);car(i);}}public static void sky(){Rect sky = ...

Hello,I am a newbie to GUIs in java. I am writing an application that has 4 buttons. You can run the codes below to see how it looks.I need it to connect to an oracle server when the "Connect to Server" button is clickedIf the connection is successful,It should set the text on lblStatus to ...

I am using Murach's Beginning Java 2 book, and am learning how to code GUIs. It said to use the following code to close a frame properly.*** testFrame.java *****************************************************import javax.swing.*;public class testFrame extends JFrame{public ...

I have a 2 dimensional array of JButtons and whenever the user clicks on one of them I need to know what location that button is. I have the action listener class writen right, but what would code and heading would the action performed method have. The array is called arrayOfUserButtons and ...

My situation (jre1.5_04, windows):I have a JList and an editable(!) JComboBox.I want to do something when the list Selection changes, in this case I want to show a messagebox that says which item I have selected. To be sure I don't show the messageBox twice, I don't do anything if ...

hi.. plz provide code for "converting an arraylist to integer value" i tried with api but unable to get it properly.... i have an arraylist temp1 ....... and i have int uid .. so how to convert thnx

Help!!I need to raise 2 to the power of another number, simple as it sounds im having a little trouble. The problem is I am raising 2 to the power of a very large number i.e. 2^1100 or even higher, and am recieving the error java.lang.NumberFormatException: Infinite or NaNwhich I am guessing is ...

Hello all,I am using the BigDecimal Objects and need to divide one number by a second both of type object BigDecimal, returning the answer ina new BigDecimal Object i.e.:BigDecimal returnThis = topLine.divide(bottomLine, BigDecimal.ROUND_UNNECESSARY);The problem I am having is that I only need ...

Hi,I get this error from the following code:<%@page contentType="text/html; charset=GBK"%><%@ page import="java.sql.*" %><%@ page import="java.io.*" %><%Connection conn = null;try {Class.forName("oracle.jdbc.driver.OracleDriver"); conn = DriverManager.getConnection( ...

hi could u explain the use of constructors.... in one class i have 2 constructors ..one is no argument constructor and second one is with arguments...... what these two constructors will do?....

Hi all,Below is a file that defines AClass and CClass. I was told to use the construction CClass toRet = (CClass) AClass.this.createDClass(); in method method in CClass, but I can't get it to work. I get the message "No enclosing instance of the type AClass is accessible in scope". What does ...

hi how to declare an arraylist with "dynamic size" .... means i have an arraylist but i do not know the size of an array... dynamically it may increase or decrease.... so how can i declare the arraylist size for getting dynamically..... plz help me

hello here is my code ... db[] dbapp = new db[];compile:[javac] Compiling 12 source files to D:\PADMA\work\APPLIC~1\PRINTING\SOURCE~1\build[javac] D:\PADMA\work\APPLIC~1\PRINTING\SOURCE~1\Source\DbController.java:156: array dimension missing[javac] DbApplication[] dbapp = new DbApplication[]; ...