Implementing JLabel MouseClick Event handler
Hey Everyone!
I am currently in the process of implementing a small GUI application for myself. Instead of using JButton, I used a JLabel as it allows me to show an image to be used as a button. I know how to use JButton's events but I have no clue how to implement a Mouse Click event for JLabel. Any ideas/code/help appreciated!!! Also if you provide code, it would be a bonus for me if you could explain it as well and how it works. You can assume I know basic Object Orientated experience. :) Thanks a bunch.
Sorry for double posting. please donot reply to this thread.
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Help needed in implementing validation event handler in OIM 11g
Hello experts,
I am trying to set username policy by implementing a validation event handler in OIM 11.1.1.5.
Following are the steps followed
1. Import metadata
Created a file called Eventhandler.xml as below and imported using weblogicImportmetadata.sh
<?xml version='1.0' encoding='UTF-8'?>
<eventhandlers xmlns="http://www.oracle.com/schema/oim/platform/kernel" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.oracle.com/schema/oim/platform/kernel orchestration-handlers.xsd">
<validation-handler class="test.iam.eventhandlers.CustomValidationEventHandler" entity-type="User" operation="CREATE" name="CustomValidationEventHandler" order="1000" sync="TRUE"/>
</eventhandlers>
2. Register plugin
plugin.xml
<?xml version="1.0" encoding="UTF-8"?>
<oimplugins xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<plugins pluginpoint="oracle.iam.platform.kernel.spi.ValidationHandler">
<plugin pluginclass="test.iam.eventhandlers.CustomValidationEventHandler" version="1.0" name="CustomValidationEventHandler" />
</plugins>
</oimplugins>
Just givng sys out in the below code to check whther it is getting triggerred during user create.
package test.iam.eventhandlers;
import java.util.HashMap;
import oracle.iam.platform.Platform;
import oracle.iam.platform.context.ContextAware;
import oracle.iam.platform.kernel.ValidationException;
import oracle.iam.platform.kernel.ValidationFailedException;
import oracle.iam.platform.kernel.spi.ValidationHandler;
import oracle.iam.platform.kernel.vo.BulkEventResult;
import oracle.iam.platform.kernel.vo.BulkOrchestration;
import oracle.iam.platform.kernel.vo.Orchestration;
public class CustomValidationEventHandler implements ValidationHandler {
@Override
public void initialize(HashMap<String, String> arg0) {
// TODO initialization
System.out.println("init validate event handler");
@Override
public void validate(long processId, long eventId, Orchestration orchestration)
throws ValidationException, ValidationFailedException {
System.out.println("Beginning of validation");
System.out.println("End of validation");
@Override
public void validate(long processId, long eventId, BulkOrchestration arg2)
throws ValidationException, ValidationFailedException {
// TODO - N/A
System.out.println("Bulk Orchestration not yet implemented");
Now when i create a user it is not allowing and i am getting system error in the front end and in the logs i could see something below
<May 28, 2012 3:03:29 PM CEST> <Error> <oracle.iam.identity.usermgmt.impl> <IAM-3050029> <The user cannot be created due to validation errors.
oracle.iam.platform.kernel.ValidationFailedException: Event handler CustomValidationEventHandler implemented using class/plug-test.iam.eventhandlers.CustomValidationEventHandler could not be loaded.
at oracle.iam.platform.kernel.impl.OrchProcessData.runValidationEvents(OrchProcessData.java:177)
at oracle.iam.platform.kernel.impl.OrchestrationEngineImpl.validate(OrchestrationEngineImpl.java:644)
at oracle.iam.platform.kernel.impl.OrchestrationEngineImpl.process(OrchestrationEngineImpl.java:497)
at oracle.iam.platform.kernel.impl.OrchestrationEngineImpl.orchestrate(OrchestrationEngineImpl.java:444)
at oracle.iam.platform.kernel.impl.OrchestrationEngineImpl.orchestrate(OrchestrationEngineImpl.java:378)
at oracle.iam.identity.usermgmt.impl.UserManagerImpl.create(UserManagerImpl.java:656)
at oracle.iam.identity.usermgmt.api.UserManagerEJB.createx(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
I have implemented preprocess and postprocess event handler before with similar kind of plugin registration, metadata import and everything worked fine. Not sure what is the problem here with validation event handler.
Thanks
DKInstead of registering the plug-in can u try placing it in the plugins folder under Oracle_IDM1/server folder.
at times restart is required. esp when the server is running in production mode.
Regards
user12841694 -
Javascript embedded in button pl/sql event handler not being executed
Javascript calls not working from pl/sql button event handler. What am I missing? Are specific settings needed to execute javascript from pl/sql proceedures?
Example: Want to toggle target='_blank' off and on in a button pl/sql event handler to open url call in new window & then reset when processing submit is done & the app returns to the form.
portal form button's pl/sql submit handler:
begin
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
end ;
Putting the following in the button's javascript on_click event handler works great:
this.form.target='_blank'
to force opening new window with a call in the button's submit pl/sql code via:
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
but then the target='_blank' is left on when the submit is done & we return to the form.
putting the above javascript as a function (called fcn_newpage) elsewhere (e.g., after form opens) & calling in the submit pl/sql with
htp.p('fcn_newpage') ;
also doesn't work.
Metalink thought this was an application issue instead of a bug, so thought I'd see if anyone knows what's going wrong here. (Portal 9.0.4.1)thanks for your discussion of my post.
Please clarify:
"htp.p('fcn_newwindow') sends a string":
What would you suggest the proper syntax for a function fcn_newwindow() call from a pl/sql javascript block that differs from
htp.p('<script language="Javascript">') ;
htp.p('fcn_newwindow');
htp.p('</script>');
or more simply
htp.p('fcn_newwindow') ;
More generally, what I'm trying to figure out is under what conditions javascript is executed, if ever, in the pl/sql of a button (either the submit or custom event handler, depending on the button).
I've seen lots of posts asking how to do a simple htp.p('alert("THIS IS TROUBLE")') ; in a pl/sql event handler for a button on a form, but no description of how this can be done successfully.
In addition to alerts, in my case, I'd like to call a javascript fcn from a pl/sql event handle that would pass a URL (e.g., http://www.oracle.com) where the javascript fcn executed
window.open(URL). The API call to set_target(URL) in pl/sql has no ability to open in a new window, so calling that is inadequate to my needs and I must resort to javascript.
Its clear in the PL/SQL of a button, you can effect form components since p_session..set_target & p_session.get_target set or get the contents of form components.
So to see if javascript ever works, I tried to focus on something simple that only had to set what amounts to an enviromental variable when we returned to the form after a post. I chose to try to change the html value of TARGET from javascript in the PL/SQL button because it doesn't need to be implemented until we finish the post and return to the form.
So I focused on a hack, setting this.form.TARGET='_blank' in the on_click event handler that forced every subsequent URL call or refresh of the form to be a new window. I then wanted to turn off opening new windows once I'd opened the URL call in a new window by setting TARGET='' in the portal form. I can achieve what I want by coding this.form.TARGET='' in the javascript (on_focus, on_change, or on_mousedown, ...) of every form component that might refresh the form. However, that is a ridiculous hack when a simple htp.p('<script>') ; htp.p('this.form.target=""') ; htp.p('</script>') ; at the end of the button's pl/sql event handle should do the same thing reliably if javascript ever works in the pl/sql event handler.
If we didn't have access to form components through p_session calls, I'd assume it was a scope issue (what is available from the pl/sql event handler). But unless my syntax is just off, when, if ever, can javascript be used in a portal form's pl/sql event handler for a button?
if I code a javascript funtion in the forms' pl/sql before displaying form:
htp.p('<script language="JavaScript">') ;
htp.p('function fcn_new_window(URL)') ;
htp.p('window.open(URL)' ) ;
htp.p('</script>') ;
the function can be called from a button's on_click javascript event handler:
fcn_new_window('http://www.oracle.com')
but from the same button's pl/sql submit event handler this call doesn't work: htp.p('fcn_new_window("http://www.oracle.com")')
So my questions remain: Is there other syntax I need, or does javascript ever work properly from the pl/sql of a form button's event handler? If it doesn't work, isn't this a bug that should be fixed by Oracle?
I can probably figure out hacks to make things work the way I need, but executing javascript from pl/sql event handlers seems to be the expected way to affect portal html pages (forms, reports, ...) and it seems not to work as expected. I don't feel I should have to implement hacks for something as simple as calling a javascript function from pl/sql when almost every example I've found in metalink or the forums or Oracle Press's "portal bible" suggests using javascript from pl/sql via the utility htp.p() to effect web page components in portal.
My TAR on the subject, while still open, returned the result basically: "We can reproduce your situation. Everything looks okay to us, but we can't explain how to use javascript where you want or point you to any documentation that would solve your problem or expain why it should not work the way you want it to. We don't feel its a technical issue. Why don't you post the problem on the portal applications forum."
I'm hoping I'm just missing something fundamental and everything will work if I implement it a little differently. So if anyone sees my error, please let me know.
by the way, not sure this is germain, but in reference to your comment:
"redirections in pl/sql procedures give a peculiar result. in a pl/sql procedure, usually, portals give the last redirection statement and ignore anything else coming after it."
if I try to raise an alert:
htp.p('alert("you screwed up")');
return;
in a pl/sql event handler, it still doesn't raise the alert, even though its the last thing implemented in the event handler. But if I set the value of a text box using p_session..set_value_as_string() at the same spot, it correctly sets the text box value when I return to the form. -
Validation Event Handler Not working with GTC Recon???
We have implemented a Validation Event Handler on user entity.
In the code we have implemented both the execute methods i.e. Orchestration andf Bulk Orchestration. We have created a UDF for Manager field and our validation handler checks whether the user in Manager UDF field is an Active user in OIM or not. In case the user is not an Active user, code will throw a Validation Failed Exception.
At the time of changing the Manager UDF value from the Console directly Validation Event Handler is getting triggered but with GTC Recon Validation Handler is not Working.
Previously i faced the same issue with the post process event handler but the problem get resoved when i implemented execute method with Bulk Orchestration. As per my understanding Bulk Orchestration exceute method gets called with GTC Recon and execute method with Orchestration gets called when changing the attribute value directly from the console.
In case of Validation Event Handler i have implemented both but still validation Event handler is not working with GTC.
Thanks in Advance....Any Help????
-
I have been having some inconsistencies with mouseEvents not firing. I have a mouseClicked event handler assigned to a radio button within a JTable. Occasionally it does not register clicks of the mouse - which obviously causes all manner of problems. I have traced the problem down and it appears to be that the mouseClicked is affected by moving the mouse between pressing and releasing - even if the mouse doesnt exit the radio button (mouseExited). I have got around this by changing to a mouseReleased but my question is:
Is this the normal behaviour or is there some sort of bug or perhaps some problem with the way they are being used.
I have researched further and this seems to happen to not just be tied to my circumstances - if you go to this address and run the MouseEventDemo you will see that if you move the mouse between clicking and releasing no mouseClicked event fires: http://java.sun.com/docs/books/tutorial/uiswing/events/mouselistener.html
Or am i being stupid?Hi georgemc,
With regards to whether its best to use with a radio button - probably not but that was just one example of where it is being used. The reason in that case i have needed to use a mouse event on the radio button is to be honest because i cant get a radio button correctly set up within my JTable and so i have had to create an extra column with another radio button and then emulate a radio buttongroup by having the negation of the boolean of the selected radio button set as the value of the other by my mouse listener! This mouse listener also caches changes for later saving back to db
In an ideal world i would have these two columns in a button group or possibly even better have on bit of data being represented as a pair of radio buttons
What type of listener would you suggest in the hypothetical situation that i had a working set of radio buttons within a JTable? -
How to handle mouseclicked events in a ListView node correctly?
Hi
We want to simulate table rows and headers with a ListView. We have an additional requirement that when a particular row is selected, a X icon will appear at the last column. Clicking which will remove the row from the table.
A snippet from the implementation is given below
public class SampleList extends ListView{
function getRow(row :Row, index:Integer, cell:ListCell):Node {
HBox {
var closeView : Image
content : [
Label {textWrap:true, text: bind row.id, layoutInfo: bind LayoutInfo {width:width * .2, height:height * .02 }}, //some column 1
Label {textWrap:true, text: bind row.name, layoutInfo: bind LayoutInfo {width:width * .12, height:height * .02 }}, //some column 2
close = ImageView {
image : Image{url:"close.png"}
disable: bind cell.selected and not cell.empty
pickOnBounds : true
onMouseClicked : function (event):Void{
if (not close.disable)
//delete from row from model (Row)
} //close column
override var cellFactory = function () {
def cell : ListCell = ListCell {
onUpdate: function() {
def item = cell.item;
cell.node = if (item == null) null; else getRow(cell.item as Row, cell.index,cell);
} The problem with the code is that the mouse clicked event used by the close button is multiplexed - Firstly - the application logic - it is used to delete the row from the model and secondly - the ListView control - uses it to trigger a item selection internally. As a result, if you click on a row which is not yet selected (in the sense that it is highlighted) at the exact location of the X icon, the row is deleted without it having been ever highlighted
If you note the code above, you will notice that the close image's mouseclicked event checks cell.selected before deleting it. And cell.selected is true even though the list has not been highlighted
Any workarounds for this problem would be appreciated
Thanks
DhruvaUser, please always tell us your jdev version.
In general you use a valueChangeListener which is fired when the user tabs out of the field...
Timo -
Event Handling Techniques with MVC
Hello all,
I have a situation where I have a model that can be thought of like a graph with many nodes and edges. I would like to create a view of this model with a customized JLabel that shows a data value for each node and edge in the model. The event handling to accomplish this has left me a bit perplexed, though. On one hand I was considering something similar to the following:
// a dedicated listener for each label
MyLabel mylabels[] = new MyLabel[numLabels];
for(int i = 0; i != mylabels.length; i++){
MyEventHandler eh = new MyEventHandler(mylabels);
mylabel.addMouseListener(eh);
public class MyEventHandler extends MouseAdapter{
private MyLabel label;
public void mouseClicked(MouseEvent e){
label.setText(etc...);
// at this point I would want to set the value of the point or edge
// that this label corresponds to, not sure of the best strategy
// here either
etc...
The other technique that I am considering might look similar to the following:
// only one listener for all labels
MyLabel mylabels[] = new MyLabel[numLabels];
MyEventHandler eh = new MyEventHandler();
for(int i = 0; i != mylabels.length; i++){
mylabel.addMouseListener(eh);
public class MyEventHandler extends MouseAdapter{
public void mouseClicked(MouseEvent e){
//call a control object in MVC architecture, for more processing
control.update(e.getSource(), (String)input);
etc...
// in the control object class
public void update(Object eventSource, String input){
MyLabel source = (MyLabel)eventSource;
source.setText(input);
// the label would have some kind of index to indicate which one it is
model.setData(source.getIndex(), input);
I am interested in knowing any accepted/popular solutions to situations like this. Are either of my samples worth implementing? I would greatly appreciate any suggestions. Thanks.I would recommend creating a single listener and add it to every label added to the graph. If you're interested in events that occur outside of the labels (in the background), add a listener to the container of the labels as well.
Unfortunately, you cannot simply add a listener to the container and get all the mouse events from the container's children because Swing's event dispatching system will only dispatch mouse events to a container if the click location was not within any of the container's children. This means that mouse listeners registered to a container will only receive mouse events within the container's background. -
Swing: when trying to get the values from a JTable inside an event handler
Hi,
I am trying to write a graphical interface to compute the Gauss Elimination procedure for solving linear systems. The class for computing the output of a linear system already works fine on console mode, but I am fighting a little bit to make it work with Swing.
I put two buttons (plus labels) and a JTextField . The buttons have the following role:
One of them gets the value from the JTextField and it will be used to the system dimension. The other should compute the solution. I also added a JTable so that the user can type the values in the screen.
So whenever the user hits the button Dimensiona the program should retrieve the values from the table cells and pass them to a 2D Array. However, the program throws a NullPointerException when I try to
do it. I have put the code for copying this Matrix inside a method and I call it from the inner class event handler.
I would thank you very much for the help.
Daniel V. Gomes
here goes the code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import AdvanceMath.*;
public class MathF2 extends JFrame {
private JTextField ArrayOfFields[];
private JTextField DimOfSis;
private JButton Calcular;
private JButton Ativar;
private JLabel label1;
private JLabel label2;
private Container container;
private int value;
private JTable DataTable;
private double[][] A;
private double[] B;
private boolean dimensionado = false;
private boolean podecalc = false;
public MathF2 (){
super("Math Calcs");
Container container = getContentPane();
container.setLayout( new FlowLayout(FlowLayout.CENTER) );
Calcular = new JButton("Resolver");
Calcular.setEnabled(false);
Ativar = new JButton("Dimensionar");
label1 = new JLabel("Clique no bot�o para resolver o sistema.");
label2 = new JLabel("Qual a ordem do sistema?");
DimOfSis = new JTextField(4);
DimOfSis.setText("0");
JTable DataTable = new JTable(10,10);
container.add(label2);
container.add(DimOfSis);
container.add(Ativar);
container.add(label1);
container.add(Calcular);
container.add(DataTable);
for ( int i = 0; i < 10 ; i ++ ){
for ( int j = 0 ; j < 10 ; j++) {
DataTable.setValueAt("0",i,j);
myHandler handler = new myHandler();
Calcular.addActionListener(handler);
Ativar.addActionListener(handler);
setSize( 500 , 500 );
setVisible( true );
public static void main ( String args[] ){
MathF2 application = new MathF2();
application.addWindowListener(
new WindowAdapter(){
public void windowClosing (WindowEvent event)
System.exit( 0 );
private class myHandler implements ActionListener {
public void actionPerformed ( ActionEvent event ){
if ( event.getSource()== Calcular ) {
if ( event.getSource()== Ativar ) {
//dimensiona a Matriz A
if (dimensionado == false) {
if (DimOfSis.getText()=="0") {
value = 2;
} else {
value = Integer.parseInt(DimOfSis.getText());
dimensionado = true;
Ativar.setEnabled(false);
System.out.println(value);
} else {
Ativar.setEnabled(false);
Calcular.setEnabled(true);
podecalc = true;
try {
InitValores( DataTable, value );
} catch (Exception e) {
System.out.println("Erro ao criar matriz" + e );
private class myHandler2 implements ItemListener {
public void itemStateChanged( ItemEvent event ){
private void InitValores( JTable table, int n ) {
A = new double[n][n];
B = new double[n];
javax.swing.table.TableModel model = table.getModel();
for ( int i = 0 ; i < n ; i++ ){
for (int j = 0 ; j < n ; j++ ){
Object temp1 = model.getValueAt(i,j);
String temp2 = String.valueOf(temp1);
A[i][j] = Double.parseDouble(temp2);What I did is set up a :
// This code will setup a listener for the table to handle a selection
players.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
ListSelectionModel rowSM = players.getSelectionModel();
rowSM.addListSelectionListener(new Delete_Player_row_Selection(this));
//Class will take the event and call a method inside the Delete_Player object.
class Delete_Player_row_Selection
implements javax.swing.event.ListSelectionListener
Delete_Player adaptee;
Delete_Player_row_Selection (Delete_Player temp)
adaptee = temp;
public void valueChanged (ListSelectionEvent listSelectionEvent)
adaptee.row_Selection(listSelectionEvent);
in the row_Selection function
if(ex.getValueIsAdjusting()) //To remove double selection
return;
ListSelectionModel lsm = (ListSelectionModel) ex.getSource();
if(lsm.isSelectionEmpty())
System.out.println("EMtpy");
else
int selected_row = lsm.getMinSelectionIndex();
ResultSetTableModel model = (ResultSetTableModel) players.getModel();
String name = (String) model.getValueAt(selected_row, 1);
Integer id = (Integer) model.getValueAt(selected_row, 3);
This is how I got info out of a table when the user selected it -
Would someone please help me. I am new to applet development and I get a compile error associated with the event handling in my first ever applet code as follows:
C:\j2sdk1.4.2_01\bin>javac trajectory_j.java
trajectory_j.java:248: illegal start of expression
private class Handler implements ActionListener {
^
trajectory_j.java:248: ';' expected
private class Handler implements ActionListener {
^
2 errors
de.
This is the code:
// trajectory Analysis Program: trajectory_j.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class trajectory_j extends JApplet implements ActionListener {
private JTextArea introductionArea, resultsArea;
private JLabel spanLabel, chordLabel,
thicknessLabel, massLabel, altitudeLabel, velocityLabel,
trajectory_angleLabel, time_incrementLabel, rotation_factorLabel,
calculationLabel, resultsLabel;
private JTextField spanField, chordField, thicknessField,
massField, altitudeField, velocityField, trajectory_angleField,
time_incrementField, rotation_factorField;
private JButton startButton, resetButton, contButton, termButton;
String introduction_string, span_string, chord_string, thickness_string, mass_string,
altitude_string, velocity_string, trajectory_angle_string,
time_increment_string, rotation_factor_string, results_string;
double span, chord, thickness, mass, altitude, velocity, trajectory_angle, time_increment,
rotation_factor, distance, velocity_fps, elapsed_time;
int status_a;
int status_b;
int status_c;
/* deletion of code segment a
span = 0;
chord = 0;
thickness = 0;
mass = 0;
altitude = 0;
velocity = 0;
trajectory_angle = 0;
time_increment = 0;
rotation_factor = 0;
distance = 0;
velocity_fps = 0;
elapsed_time = 0;
velocity_fps = 0;
elapsed_time = 0;
// create objects
public void init()
status_a = 0;
status_b = 0;
status_c = 0;
// create container & panel
Container container = getContentPane();
Panel panel = new Panel( new FlowLayout( FlowLayout.LEFT));
container.add( panel );
// set up vertical boxlayout
Box box = Box.createVerticalBox();
Box inputbox1 = Box.createHorizontalBox();
Box inputbox2 = Box.createHorizontalBox();
Box inputbox3 = Box.createHorizontalBox();
Box buttonbox = Box.createHorizontalBox();
introduction_string = "This is the introduction";
// set up introduction
introductionArea = new JTextArea( introduction_string, 10, 50 );
introductionArea.setEditable( false );
box.add( new JScrollPane( introductionArea ) );
box.add( Box.createVerticalStrut (10) );
box.add( inputbox1);
// set up span
spanLabel = new JLabel( "span (feet)" );
spanField = new JTextField(5 );
inputbox1.add( spanLabel );
inputbox1.add( spanField );
Dimension minSize = new Dimension(5, 15);
Dimension prefSize = new Dimension(5, 15);
Dimension maxSize = new Dimension(Short.MAX_VALUE, 15);
inputbox1.add(new Box.Filler(minSize, prefSize, maxSize));
// set up chord
chordLabel = new JLabel( "chord (feet)" );
chordField = new JTextField(5 );
inputbox1.add( chordLabel );
inputbox1.add( chordField );
inputbox1.add(new Box.Filler(minSize, prefSize, maxSize));
// set up thickness
thicknessLabel = new JLabel( "thickness (feet)" );
thicknessField = new JTextField(5 );
inputbox1.add( thicknessLabel );
inputbox1.add( thicknessField );
inputbox1.add(new Box.Filler(minSize, prefSize, maxSize));
// set up mass
massLabel = new JLabel( "mass (slugs)" );
massField = new JTextField(5);
inputbox1.add( massLabel );
inputbox1.add( massField );
box.add( Box.createVerticalStrut (10) );
box.add( inputbox2);
// set up altitude
altitudeLabel = new JLabel( "altitude (feet)");
altitudeField = new JTextField(5 );
inputbox2.add( altitudeLabel );
inputbox2.add( altitudeField );
inputbox2.add(new Box.Filler(minSize, prefSize, maxSize));
// set up velocity
velocityLabel = new JLabel( "velocity (Mach Number)");
velocityField = new JTextField(5);
inputbox2.add( velocityLabel );
inputbox2.add( velocityField );
inputbox2.add(new Box.Filler(minSize, prefSize, maxSize));
// set up trajectory_angle
trajectory_angleLabel = new JLabel( "trajectory angle ( -90 degrees <= trajectory angle <= 90 degrees )");
trajectory_angleField = new JTextField(5);
inputbox2.add( trajectory_angleLabel );
inputbox2.add( trajectory_angleField );
box.add( Box.createVerticalStrut (10) );
box.add( inputbox3);
Dimension minSizeF = new Dimension(70, 15);
Dimension prefSizeF = new Dimension(70, 15);
Dimension maxSizeF = new Dimension(Short.MAX_VALUE, 15);
inputbox3.add(new Box.Filler(minSizeF, prefSizeF, maxSizeF));
// set up time_increment
time_incrementLabel = new JLabel( "time increment (seconds)" );
time_incrementField = new JTextField(5);
inputbox3.add( time_incrementLabel );
inputbox3.add( time_incrementField );
inputbox3.add(new Box.Filler(minSizeF, prefSizeF, maxSizeF));
// set up rotation_factor
rotation_factorLabel = new JLabel( "rotation factor ( non-negative number)" );
rotation_factorField = new JTextField(5);
inputbox3.add( rotation_factorLabel );
inputbox3.add( rotation_factorField );
inputbox3.add(new Box.Filler(minSizeF, prefSizeF, maxSizeF));
box.add( Box.createVerticalStrut (10) );
box.add( buttonbox);
// set up start
startButton = new JButton( "START" );
buttonbox.add( startButton );
Dimension minSizeB = new Dimension(10, 30);
Dimension prefSizeB = new Dimension(10, 30);
Dimension maxSizeB = new Dimension(Short.MAX_VALUE, 30);
buttonbox.add(new Box.Filler(minSizeB, prefSizeB, maxSizeB));
// set up reset
resetButton = new JButton( "RESET" );
buttonbox.add( resetButton );
buttonbox.add(new Box.Filler(minSizeB, prefSizeB, maxSizeB));
// set up cont
contButton = new JButton( "CONTINUE" );
buttonbox.add( contButton );
buttonbox.add(new Box.Filler(minSizeB, prefSizeB, maxSizeB));
// set up term
termButton = new JButton( "END" );
buttonbox.add( termButton );
box.add( Box.createVerticalStrut (10) );
// set up results
resultsArea = new JTextArea( results_string, 10, 50 );
resultsArea.setEditable( false );
box.add( new JScrollPane( resultsArea ) );
// add box to panel
panel.add( box );
// register event handlers
Handler handler = new Handler();
spanField.addActionListener( handler );
chordField.addActionListener( handler );
thicknessField.addActionListener( handler );
massField.addActionListener( handler );
altitudeField.addActionListener( handler );
velocityField.addActionListener( handler );
trajectory_angleField.addActionListener( handler );
time_incrementField.addActionListener( handler );
rotation_factorField.addActionListener( handler );
startButton.addActionListener( handler );
resetButton.addActionListener( handler );
contButton.addActionListener( handler );
termButton.addActionListener( handler );
// private inner class for event handling
private class Handler implements ActionListener {
// process handler events
public void actionPerformed( ActionEvent event )
// process resetButton event
if ( event.getSource() == resetButton )
reset();
// process contButton event
if ( event.getSource() == contButton )
cont();
// process endButton event
if ( event.getSource() == termButton )
// process span event
if( event.getSource() == spanField ) {
span = Double.parseDouble( event.getActionCommand() );
spanField.setText( span_string );
status_b++;
// process chord event
if( event.getSource() == spanField ) {
span = Double.parseDouble( event.getActionCommand() );
spanField.setText( chord_string );
status_b++;
// process thickness event
if( event.getSource() == thicknessField ) {
thickness = Double.parseDouble( event.getActionCommand() );
spanField.setText( thickness_string );
status_b++;
// process mass event
if( event.getSource() == massField ) {
mass = Double.parseDouble( event.getActionCommand() );
spanField.setText( mass_string );
status_b++;
// process altitude event
if( event.getSource() == altitudeField ) {
altitude = Double.parseDouble( event.getActionCommand() );
spanField.setText( altitude_string );
status_b++;
// process velocity event
if( event.getSource() == velocityField ) {
velocity = Double.parseDouble( event.getActionCommand() );
spanField.setText( velocity_string );
status_b++;
// process trajectory_angle event
if( event.getSource() == trajectory_angleField ) {
trajectory_angle = Double.parseDouble( event.getActionCommand() );
spanField.setText( trajectory_angle_string );
status_b++;
// process time_increment event
if( event.getSource() == time_incrementField ) {
time_increment = Double.parseDouble( event.getActionCommand() );
spanField.setText( time_increment_string );
status_b++;
// process rotation_factor event
if( event.getSource() == rotation_factorField ) {
rotation_factor = Double.parseDouble( event.getActionCommand() );
spanField.setText( rotation_factor_string );
status_b++;
// process startButton event
if ( event.getSource() == startButton && status_b == 9 ) {
status_c = 1;
} // end method event handler
} // end Handler class
} // end method init
public void strtb()
/* deletion of code segment 1
startButton.addActionListener(
new ActionListener() { // anonymous inner class
// set text in resultsArea
public void actionPerformed( ActionEvent event )
if( status_c == 1 ){
calculate();
results();
resultsArea.setText( results() );
/* deletion of code segment 2
}// end method actionPerformed1
} // end anonymous inner class1
); // end call to addActionlistener1
} // end method strtb
public void reset()
/* deletion of code segment 3
resetButton.addActionListener(
new ActionListener() { // anonymous inner class
// set text in resultsArea
public void actionPerformed( ActionEvent event )
span_string = "";
chord_string = "";
thickness_string = "";
mass_string = "";
altitude_string = "";
velocity_string = "";
trajectory_angle_string = "";
time_increment_string = "";
rotation_factor_string = "";
results_string = "";
spanField.setText( span_string );
chordField.setText( chord_string );
thicknessField.setText( thickness_string );
massField.setText( mass_string );
altitudeField.setText( altitude_string );
velocityField.setText( velocity_string );
trajectory_angleField.setText( trajectory_angle_string );
time_incrementField.setText( time_increment_string );
rotation_factorField.setText( rotation_factor_string );
resultsArea.setEditable( true );
resultsArea.setText( results_string );
resultsArea.setEditable( false );
span = 0;
chord = 0;
thickness = 0;
mass = 0;
altitude = 0;
velocity = 0;
trajectory_angle = 0;
time_increment = 0;
rotation_factor = 0;
distance = 0;
velocity_fps = 0;
elapsed_time = 0;
/* deletion of code segment 4
} // end method actionPerformed2
} // end anonymous inner class2
); // end call to addActionlistener2
} // end method reset
public void cont()
//later
public void calculate()
distance = 1;
altitude = 2;
trajectory_angle = 3;
velocity_fps = 4;
elapsed_time = 5;
public String results()
results_string =
"Distance =\t\t" + distance + " miles\n"
+ "Altitude =\t\t" + altitude + " feet\n"
+ "Trajectory Angle =\t" + trajectory_angle + " degrees\n"
+ "Velocity =\t\t" + velocity_fps + " feet per second\n"
+ "Elapsed Time =\t\t" + elapsed_time + " seconds\n"
+ "\nstatus_a = " + status_a + "\nstatus_b = "
+ status_b + "\nstatus_c = " + status_c;
return results_string;
public void start()
if(status_a == 0 )
strtb();
if (status_b == 0)
reset();
}// end method start
} //end class trajectory_aThe following are copies of html and java source code files for a prior runnable version ( trajectory_b ) of this program which can enlighten some functionality intended by the program.
(trajectory_b.html):
<html>
<appletcode = "trajectory_b.class" width = "800" height = "600">
</applet>
</html>
(trajectory_b.java):
// trajectory Analysis Program: trajectory_b.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class trajectory_b extends JApplet implements ActionListener {
private JTextArea introductionArea, resultsArea;
private JLabel spanLabel, chordLabel,
thicknessLabel, massLabel, altitudeLabel, velocityLabel,
trajectory_angleLabel, time_incrementLabel, rotation_factorLabel,
calculationLabel, resultsLabel;
private JTextField spanField, chordField, thicknessField,
massField, altitudeField, velocityField, trajectory_angleField,
time_incrementField, rotation_factorField;
private JButton startButton, resetButton, contButton, termButton;
String introduction_string, span_string, chord_string, thickness_string, mass_string,
altitude_string, velocity_string, trajectory_angle_string,
time_increment_string, rotation_factor_string, results_string;
double span, chord, thickness, mass, altitude, velocity, trajectory_angle, time_increment,
rotation_factor, distance, velocity_fps, elapsed_time;
int status_a;
int status_b;
int status_c;
/* deletion of code segment a
span = 0;
chord = 0;
thickness = 0;
mass = 0;
altitude = 0;
velocity = 0;
trajectory_angle = 0;
time_increment = 0;
rotation_factor = 0;
distance = 0;
velocity_fps = 0;
elapsed_time = 0;
velocity_fps = 0;
elapsed_time = 0;
// create objects
public void init()
status_a = 0;
status_b = 0;
status_c = 0;
// create container & panel
Container container = getContentPane();
Panel panel = new Panel( new FlowLayout( FlowLayout.LEFT));
container.add( panel );
// set up vertical boxlayout
Box box = Box.createVerticalBox();
Box inputbox1 = Box.createHorizontalBox();
Box inputbox2 = Box.createHorizontalBox();
Box inputbox3 = Box.createHorizontalBox();
Box buttonbox = Box.createHorizontalBox();
introduction_string = "This is the introduction";
// set up introduction
introductionArea = new JTextArea( introduction_string, 10, 50 );
introductionArea.setEditable( false );
box.add( new JScrollPane( introductionArea ) );
box.add( Box.createVerticalStrut (10) );
box.add( inputbox1);
// set up span
spanLabel = new JLabel( "span (feet)" );
spanField = new JTextField(5 );
inputbox1.add( spanLabel );
inputbox1.add( spanField );
Dimension minSize = new Dimension(5, 15);
Dimension prefSize = new Dimension(5, 15);
Dimension maxSize = new Dimension(Short.MAX_VALUE, 15);
inputbox1.add(new Box.Filler(minSize, prefSize, maxSize));
// set up chord
chordLabel = new JLabel( "chord (feet)" );
chordField = new JTextField(5 );
inputbox1.add( chordLabel );
inputbox1.add( chordField );
inputbox1.add(new Box.Filler(minSize, prefSize, maxSize));
// set up thickness
thicknessLabel = new JLabel( "thickness (feet)" );
thicknessField = new JTextField(5 );
inputbox1.add( thicknessLabel );
inputbox1.add( thicknessField );
inputbox1.add(new Box.Filler(minSize, prefSize, maxSize));
// set up mass
massLabel = new JLabel( "mass (slugs)" );
massField = new JTextField(5);
inputbox1.add( massLabel );
inputbox1.add( massField );
box.add( Box.createVerticalStrut (10) );
box.add( inputbox2);
// set up altitude
altitudeLabel = new JLabel( "altitude (feet)");
altitudeField = new JTextField(5 );
inputbox2.add( altitudeLabel );
inputbox2.add( altitudeField );
inputbox2.add(new Box.Filler(minSize, prefSize, maxSize));
// set up velocity
velocityLabel = new JLabel( "velocity (Mach Number)");
velocityField = new JTextField(5);
inputbox2.add( velocityLabel );
inputbox2.add( velocityField );
inputbox2.add(new Box.Filler(minSize, prefSize, maxSize));
// set up trajectory_angle
trajectory_angleLabel = new JLabel( "trajectory angle ( -90 degrees <= trajectory angle <= 90 degrees )");
trajectory_angleField = new JTextField(5);
inputbox2.add( trajectory_angleLabel );
inputbox2.add( trajectory_angleField );
box.add( Box.createVerticalStrut (10) );
box.add( inputbox3);
Dimension minSizeF = new Dimension(70, 15);
Dimension prefSizeF = new Dimension(70, 15);
Dimension maxSizeF = new Dimension(Short.MAX_VALUE, 15);
inputbox3.add(new Box.Filler(minSizeF, prefSizeF, maxSizeF));
// set up time_increment
time_incrementLabel = new JLabel( "time increment (seconds)" );
time_incrementField = new JTextField(5);
inputbox3.add( time_incrementLabel );
inputbox3.add( time_incrementField );
inputbox3.add(new Box.Filler(minSizeF, prefSizeF, maxSizeF));
// set up rotation_factor
rotation_factorLabel = new JLabel( "rotation factor ( non-negative number)" );
rotation_factorField = new JTextField(5);
inputbox3.add( rotation_factorLabel );
inputbox3.add( rotation_factorField );
inputbox3.add(new Box.Filler(minSizeF, prefSizeF, maxSizeF));
box.add( Box.createVerticalStrut (10) );
box.add( buttonbox);
// set up start
startButton = new JButton( "START" );
buttonbox.add( startButton );
Dimension minSizeB = new Dimension(10, 30);
Dimension prefSizeB = new Dimension(10, 30);
Dimension maxSizeB = new Dimension(Short.MAX_VALUE, 30);
buttonbox.add(new Box.Filler(minSizeB, prefSizeB, maxSizeB));
// set up reset
resetButton = new JButton( "RESET" );
buttonbox.add( resetButton );
buttonbox.add(new Box.Filler(minSizeB, prefSizeB, maxSizeB));
// set up cont
contButton = new JButton( "CONTINUE" );
buttonbox.add( contButton );
buttonbox.add(new Box.Filler(minSizeB, prefSizeB, maxSizeB));
// set up term
termButton = new JButton( "END" );
buttonbox.add( termButton );
box.add( Box.createVerticalStrut (10) );
// set up results
resultsArea = new JTextArea( results_string, 10, 50 );
resultsArea.setEditable( false );
box.add( new JScrollPane( resultsArea ) );
// add box to panel
panel.add( box );
// register event handlers
Handler handler = new Handler();
spanField.addActionListener( handler );
chordField.addActionListener( handler );
thicknessField.addActionListener( handler );
massField.addActionListener( handler );
altitudeField.addActionListener( handler );
velocityField.addActionListener( handler );
trajectory_angleField.addActionListener( handler );
time_incrementField.addActionListener( handler );
rotation_factorField.addActionListener( handler );
startButton.addActionListener( handler );
resetButton.addActionListener( handler );
contButton.addActionListener( handler );
termButton.addActionListener( handler );
} // end method init
// process handler events
public void actionPerformed( ActionEvent event )
// process resetButton event
if ( event.getSource() == resetButton )
reset();
// process contButton event
if ( event.getSource() == contButton )
cont();
// process endButton event
if ( event.getSource() == termButton )
// process span event
if( event.getSource() == spanField ) {
span = Double.parseDouble( event.getActionCommand() );
spanField.setText( span_string );
status_b++;
// process chord event
if( event.getSource() == spanField ) {
span = Double.parseDouble( event.getActionCommand() );
spanField.setText( chord_string );
status_b++;
// process thickness event
if( event.getSource() == thicknessField ) {
thickness = Double.parseDouble( event.getActionCommand() );
spanField.setText( thickness_string );
status_b++;
// process mass event
if( event.getSource() == massField ) {
mass = Double.parseDouble( event.getActionCommand() );
spanField.setText( mass_string );
status_b++;
// process altitude event
if( event.getSource() == altitudeField ) {
altitude = Double.parseDouble( event.getActionCommand() );
spanField.setText( altitude_string );
status_b++;
// process velocity event
if( event.getSource() == velocityField ) {
velocity = Double.parseDouble( event.getActionCommand() );
spanField.setText( velocity_string );
status_b++;
// process trajectory_angle event
if( event.getSource() == trajectory_angleField ) {
trajectory_angle = Double.parseDouble( event.getActionCommand() );
spanField.setText( trajectory_angle_string );
status_b++;
// process time_increment event
if( event.getSource() == time_incrementField ) {
time_increment = Double.parseDouble( event.getActionCommand() );
spanField.setText( time_increment_string );
status_b++;
// process rotation_factor event
if( event.getSource() == rotation_factorField ) {
rotation_factor = Double.parseDouble( event.getActionCommand() );
spanField.setText( rotation_factor_string );
status_b++;
// process startButton event
if ( event.getSource() == startButton && status_b == 9 ) {
strtb();
} // end method event handler
public void strtb()
startButton.addActionListener(
new ActionListener() { // anonymous inner class
// set text in resultsArea
public void actionPerformed( ActionEvent event )
calculate();
results();
resultsArea.setText( results() );
}// end method actionPerformed1
} // end anonymous inner class1
); // end call to addActionlistener1
} // end method strtb
public void reset()
resetButton.addActionListener(
new ActionListener() { // anonymous inner class
// set text in resultsArea
public void actionPerformed( ActionEvent event )
span_string = "";
chord_string = "";
thickness_string = "";
mass_string = "";
altitude_string = "";
velocity_string = "";
trajectory_angle_string = "";
time_increment_string = "";
rotation_factor_string = "";
results_string = "";
spanField.setText( span_string );
chordField.setText( chord_string );
thicknessField.setText( thickness_string );
massField.setText( mass_string );
altitudeField.setText( altitude_string );
velocityField.setText( velocity_string );
trajectory_angleField.setText( trajectory_angle_string );
time_incrementField.setText( time_increment_string );
rotation_factorField.setText( rotation_factor_string );
resultsArea.setEditable( true );
resultsArea.setText( results_string );
resultsArea.setEditable( false );
span = 0;
chord = 0;
thickness = 0;
mass = 0;
altitude = 0;
velocity = 0;
trajectory_angle = 0;
time_increment = 0;
rotation_factor = 0;
distance = 0;
velocity_fps = 0;
elapsed_time = 0;
} // end method actionPerformed2
} // end anonymous inner class2
); // end call to addActionlistener2
} // end method reset
public void cont()
//later
public void calculate()
distance = 1;
altitude = 2;
trajectory_angle = 3;
velocity_fps = 4;
elapsed_time = 5;
public String results()
results_string =
"Distance =\t\t" + distance + " miles\n"
+ "Altitude =\t\t" + altitude + " feet\n"
+ "Trajectory Angle =\t" + trajectory_angle + " degrees\n"
+ "Velocity =\t\t" + velocity_fps + " feet per second\n"
+ "Elapsed Time =\t\t" + elapsed_time + " seconds\n"
+ "\nstatus_a = " + status_a + "\nstatus_b = "
+ status_b + "\nstatus_c = " + status_c;
return results_string;
public void start()
if(status_a == 0 )
strtb();
if (status_b == 0)
reset();
}// end method start
} //end class trajectory_b -
Event Handling Help needed please.
Hi,
I am writing a program to simulate a supermarket checkout. I have done the GUI and now i am trying to do the event handling. I have come up against a problem.
I have a JCombobox called prodList and i have added an string array to it called prods . I have also created 2 more arrays with numbers in them.
I want to write the code for if an item is selected from the combo box that the name from the array is shown in a textfield tf1, and also the price and stock no which correspond to the seclected item (both initialised in the other arrays) are also added to the textfield tf1.
I have started writng the code but i am really stuck. Could someone please help me with this please. The code i have done so far is as follows(just the event handling code shown)
public void ItemStateChange(ItemEvent ie){
if(ie.getItemSelected()== prodList)
changeOutput();
public void changeOutput()
if(ItemSelected ==0)
tf1.setText("You have selected" +a +b +c);
}Do you say this because i missed the d of ItemStateChanged ?
I have amended that but still i am getting the same errors class or enum expected. 4 of them relating to the itemStateChanged method.
i will post my whole code if it helps
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Observer; //new
import java.util.Observable;//new
import javax.swing.BorderFactory;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
public class MySuperMktPro
public MySuperMktPro()
CheckoutView Check1 = new CheckoutView(1,0,0);
CheckoutView Check2 = new CheckoutView(2,300,0);
CheckoutView Check3 = new CheckoutView(3,600,0);
CheckoutView Check4 = new CheckoutView(4,0,350);
CheckoutView Check5 = new CheckoutView(5,600,350);
OfficeView off111 = new OfficeView();
public static void main(String[] args) {
// TODO, add your application code
System.out.println("Starting My Supermarket Project...");
MySuperMktPro startup = new MySuperMktPro();
class CheckoutView implements ItemListener , ActionListener
private OfficeView off1;
private JFrame chk1;
private Container cont1;
private Dimension screensize,tempDim;
private JPanel pan1,pan2,pan3,pan4,pan5;
private JButton buyBut,prodCode;
private JButton purchase,cashBack,manual,remove,disCo;
private JButton but1,but2,finaLi1,but4,but5,but6;
private JTextArea tArea1,tArea2;
private JTextField tf1,tf2,tf3,list2;
private JComboBox prodList;
private JLabel lab1,lab2,lab3,lab4,lab5,lab6,lab7;
private int checkoutID; //New private int for all methods of this class
private int passedX,passedY;
private String prods[];
private JButton rb1,rb2,rb3,rb4;
private double price[];
private int code[];
public CheckoutView(int passedInteger,int passedX,int passedY)
checkoutID = passedInteger; //Store the int passed into the method
this.passedX = passedX;
this.passedY = passedY;
drawCheckoutGui();
public void drawCheckoutGui()
prods= new String[20];
prods[0] = "Beans";
prods[1] = "Eggs";
prods[2] = "bread";
prods[3] = "Jam";
prods[4] = "Butter";
prods[5] = "Cream";
prods[6] = "Sugar";
prods[7] = "Peas";
prods[8] = "Milk";
prods[9] = "Bacon";
prods[10] = "Spaghetti";
prods[11] = "Corn Flakes";
prods[12] = "Carrots";
prods[13] = "Oranges";
prods[14] = "Bananas";
prods[15] = "Snickers";
prods[16] = "Wine";
prods[17] = "Beer";
prods[18] = "Lager";
prods[19] = "Cheese";
for(i=0; i<prods.length;i++);
code = new int [20];
code[0] = 1;
code[1] = 2;
code[2] = 3;
code[3] = 4;
code[4] = 5;
code[5] = 6;
code[6] = 7;
code[7] = 8;
code[8] = 9;
code[9] = 10;
code[10] = 11;
code[11] = 12;
code[12] = 13;
code[13] = 14;
code[14] = 15;
code[15] = 16;
code[16] = 17;
code[17] = 18;
code[18] = 19;
code[19] = 20;
for(b=0; b<code.length; b++);
price = new double [20];
price[0] = 0.65;
price[1] = 0.84;
price[2] = 0.98;
price[3] = 0.75;
price[4] = 0.45;
price[5] = 0.65;
price[6] = 1.78;
price[7] = 1.14;
price[8] = 0.98;
price[9] = 0.99;
price[10] = 0.98;
price[11] = 0.65;
price[12] = 1.69;
price[13] = 2.99;
price[14] = 0.99;
price[15] = 2.68;
price[16] = 0.89;
price[17] = 5.99;
price[18] = 1.54;
price[19] = 2.99;
for(c=0; c<code.length; c++);
screensize = Toolkit.getDefaultToolkit().getScreenSize();
chk1 = new JFrame();
chk1.setTitle("Checkout #" + checkoutID); //Use the new stored int
chk1.setSize(300,350);
chk1.setLocation(passedX,passedY);
chk1.setLayout(new GridLayout(5,1));
//chk1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
cont1 = chk1.getContentPane();
//chk1.setLayout(new BorderLayout());
pan1 = new JPanel();
pan2 = new JPanel();
pan3 = new JPanel();
pan4 = new JPanel();
pan5 = new JPanel();
//panel 1
pan1.setLayout(new FlowLayout());
pan1.setBackground(Color.black);
prodList = new JComboBox(prods);
prodList.setMaximumRowCount(2);
prodList.addItemListener(this);
but1 = new JButton("Buy");
but1.addActionListener(this);
lab1 = new JLabel("Products");
lab1.setForeground(Color.white);
lab1.setBorder(BorderFactory.createLineBorder(Color.white));
pan1.add(lab1);
pan1.add(prodList);
pan1.add(but1);
//panel 2
pan2 = new JPanel();
pan2.setLayout(new BorderLayout());
pan2.setBackground(Color.black);
lab3 = new JLabel(" Enter Product Code");
lab3.setForeground(Color.white);
tArea2 = new JTextArea(8,10);
tArea2.setBorder(BorderFactory.createLineBorder(Color.white));
lab5 = new JLabel(" Tesco's ");
lab5.setForeground(Color.white);
lab5.setBorder(BorderFactory.createLineBorder(Color.white));
lab6 = new JLabel("Checkout");
lab6.setForeground(Color.white);
lab6.setBorder(BorderFactory.createLineBorder(Color.white));
lab7 = new JLabel("You selected ");
lab7.setForeground(Color.cyan);
//lab7.setBorder(BorderFactory.createLineBorder(Color.white));
pan2.add(lab7,"North");
pan2.add(lab6,"East");
pan2.add(tArea2,"Center");
pan2.add(lab5,"West");
pan2.add(lab3,"South");
//panel 3
pan3 = new JPanel();
pan3.setLayout(new FlowLayout());
pan3.setBackground(Color.black);
manual = new JButton("Manual");
manual.addActionListener(this);
manual.setBorder(BorderFactory.createLineBorder(Color.white));
remove = new JButton("Remove");
remove.addActionListener(this);
remove.setBorder(BorderFactory.createLineBorder(Color.white));
tf1 = new JTextField(5);
pan3.add(manual);
pan3.add(tf1);
pan3.add(remove);
//panel 4
pan4 = new JPanel();
pan4.setLayout(new FlowLayout());
pan4.setBackground(Color.black);
finaLi1 = new JButton("Finalise");
// finaLi1.addActionListener(this);
cashBack = new JButton("Cashback");
JTextField list2 = new JTextField(5);
but4 = new JButton(" Sum Total");
but4.addActionListener(this);
but4.setBorder(BorderFactory.createLineBorder(Color.white));
cashBack.setBorder(BorderFactory.createLineBorder(Color.white));
pan4.add(cashBack);
pan4.add(list2);
pan4.add(but4);
//panel 5
pan5 = new JPanel();
pan5.setLayout(new GridLayout(2,3));
pan5.setBackground(Color.black);
disCo = new JButton("Discount");
disCo.addActionListener(this);
disCo.setBorder(BorderFactory.createLineBorder(Color.black));
but6 = new JButton("Finalise");
but6.addActionListener(this);
but6.setBorder(BorderFactory.createLineBorder(Color.black));
rb1 = new JButton("Cash");
rb1.addActionListener(this);
rb1.setBorder(BorderFactory.createLineBorder(Color.black));
rb2 = new JButton("Card");
rb2.addActionListener(this);
rb2.setBorder(BorderFactory.createLineBorder(Color.black));
rb3 = new JButton("Cheque");
rb3.addActionListener(this);
rb3.setBorder(BorderFactory.createLineBorder(Color.black));
rb4 = new JButton("Voucher");
rb4.addActionListener(this);
rb4.setBorder(BorderFactory.createLineBorder(Color.black));
pan5.add(disCo);
pan5.add(but6);
pan5.add(rb1);
pan5.add(rb2);
pan5.add(rb3);
pan5.add(rb4);
//add the panels to the container
cont1.add(pan1);
cont1.add(pan4);
cont1.add(pan2);
cont1.add(pan3);
cont1.add(pan5);
chk1.setContentPane(cont1);
chk1.setVisible(true);
class OfficeView
private OfficeView off111;
private JFrame offMod1;
private JPanel pane1;
private JButton refill;
private Container cont11;
private Dimension screensize;
private JTextField tf11,tf12;
public OfficeView()
drawOfficeGUI();
public void drawOfficeGUI()
screensize = Toolkit.getDefaultToolkit().getScreenSize();
offMod1 = new JFrame("Office Control");
int frameWidth = 300;
int frameHeight = 250;
offMod1.setSize(frameWidth,frameHeight);
offMod1.setLocation(300,350);
offMod1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
cont11 = offMod1.getContentPane();
pane1 = new JPanel();
pane1.setBackground(Color.cyan);
refill = new JButton("Refill");
tf11 = new JTextField(25);
tf12 = new JTextField(25);
pane1.add(tf11);
pane1.add(refill);
pane1.add(tf12);
cont11.add(pane1);
offMod1.setContentPane(cont11);
offMod1.setVisible(true);
public void ItemStateChanged(ItemEvent ie)
if(ie.getItemSelected()== prodList)
changeOutput();
public void changeOutput()
if(ItemSelected ==0)
tf1.setText("You have selected", +a +b +c);
}Message was edited by:
fowlergod09 -
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 meimport java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ActionEvents implements ActionListener
JDialog dialog;
public ActionEvents(JFrame f)
dialog = new JDialog(f, "dialog");
dialog.getContentPane().add(new JLabel("hello world", JLabel.CENTER));
dialog.setSize(200,100);
dialog.setLocation(425,200);
public void actionPerformed(ActionEvent e)
if(!dialog.isVisible())
dialog.setVisible(true);
else
dialog.toFront();
private JPanel getPanel()
JButton button = new JButton("open dialog");
button.addActionListener(this);
JPanel panel = new JPanel();
panel.add(button);
return panel;
public static void main(String[] args)
JFrame f = new JFrame();
ActionEvents ae = new ActionEvents(f);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(ae.getPanel(), "North");
f.setSize(200,100);
f.setLocation(200,200);
f.setVisible(true);
} -
I am customizing my own menu bar, I would like to create some event handling, for the top most level, it is not a problem, but when I try to implement some event handling for the drop-down list/menu, nothing happens.
The following is the whole class:
package diagramillustrator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DIM extends JMenuBar implements MouseListener
* Creates a new instance of DIM
public DIM()
configFileMenu();
configOptionsMenu();
configAllItems();
configMenuBar();
//Creation and Initialization of objects
//<editor-fold>
//file and options menus to be added to the menubar
JMenu fileMenu = new JMenu("File");
JMenu optionsMenu = new JMenu("Options");
//file items
JMenuItem newItem = new JMenuItem("New");
JMenuItem openItem = new JMenuItem("Open");
JMenuItem saveItem = new JMenuItem("Save");
JMenuItem printItem = new JMenuItem("Print");
JMenuItem exitItem = new JMenuItem("Exit");
//options items
JMenuItem createFileItem = new JMenuItem("Create properties file");
JMenuItem propertiesItem = new JMenuItem("Properties");
//</editor-fold>
//adds mouse listener to every item
private void configAllItems()
this.addMouseListener(this);
fileMenu.addMouseListener(this);
optionsMenu.addMouseListener(this);
newItem.addMouseListener(this);
openItem.addMouseListener(this);
saveItem.addMouseListener(this);
printItem.addMouseListener(this);
exitItem.addMouseListener(this);
createFileItem.addMouseListener(this);
propertiesItem.addMouseListener(this);
//creats the file menu
private void configFileMenu()
fileMenu.add(newItem);
fileMenu.addSeparator();
fileMenu.add(saveItem);
fileMenu.add(openItem);
fileMenu.add(printItem);
fileMenu.addSeparator();
fileMenu.add(exitItem);
//creats the options menu
private void configOptionsMenu()
optionsMenu.add(createFileItem);
optionsMenu.add(propertiesItem);
//configures the menubar, adds all items to it etc
private void configMenuBar()
this.setLayout(new FlowLayout(FlowLayout.LEFT));
this.add(fileMenu);
this.add(new JSeparator(SwingConstants.VERTICAL));
this.add(new JSeparator(SwingConstants.VERTICAL));
this.add(optionsMenu);
this.setToolTipText("Menu Bar");
//event handling
//<editor-fold>
public void mouseClicked(MouseEvent e)
//works
//if(e.getSource().equals(fileMenu))this.setBackground(Color.yellow);
//else this.setBackground(Color.black);
//dowsn't work
if(e.getSource().equals(newItem))this.setBackground(Color.yellow);
public void mousePressed(MouseEvent e)
public void mouseReleased(MouseEvent e)
public void mouseEntered(MouseEvent e)
public void mouseExited(MouseEvent e)
//</editor-fold>
//main method to test class
public static void main(String[] args)
JFrame f= new JFrame("Testing menu");
f.setSize(400,400);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setJMenuBar(new DIM());
f.show();
} This is the troubling part:
public void mouseClicked(MouseEvent e)
//works
//if(e.getSource().equals(fileMenu))this.setBackground(Color.yellow);
//else this.setBackground(Color.black);
//dowsn't work
if(e.getSource().equals(newItem))this.setBackground(Color.yellow);
} The first two lines work perfectly fine as they apply to the top most level, the rest doesn't do anything at all.
Can anyone help me to handle events for the drop-down please?
AndXerSorry posted the prvious by mistake.
Oh, I usually used MouseListener for buttons...I tried using ActionListener and it worked great, the only flaw is that any mouse button clicked triggers an event, I want the event to be triggered only when BUTTON_1 is clicked (like in MouseListener).
Can that be done as I found nothing in the API. If yes, a code sample would be greatly appreciated.
The current code for handling it is:
if(e.getSource().equals(newItem))
this.setBackground(Color.green);
}Thanks,
AndXer -
Event handling - output doubled?!
hi, i'm trying to implement some event handling through an extension of the MouseAdapter class, but the output comes out twice for some reason. code is as follows:
note: for some reason an 'i' enclosed in square brackets isn't shown in these forums, but makes things italic... any idea how to change that?!
public void mouseClicked(MouseEvent e)
p = e.getPoint() ;
for(int i = 0 ; i < myproj.length ; i++)
rect = myproj.getDshape() ;
System.out.println(rect.toString()) ;
if (rect.contains(p))
System.out.println(i) ;
System.out.println(myproj.length) ;
System.out.println("clicked one!") ;
System.out.println(p.toString()) ;
System.out.println(myproj[i].getDname() + " : " + myproj[i].getStrength() + " : " + myproj[i].getDom()) ;
wanted++ ;
System.out.println("Count: " + counter) ;
counter++ ;
} // end class MyEventHandler
however, when i click in one of the 2 rectangles on my applet, the following output is printed:
java.awt.Rectangle[x=521,y=50,width=25,height=25]
0
2
clicked one!
java.awt.Point[x=541,y=62]
tom : 4.51 : 1
Count: 0
java.awt.Rectangle[x=571,y=80,width=25,height=25]
java.awt.Rectangle[x=521,y=50,width=25,height=25]
0
2
clicked one!
java.awt.Point[x=541,y=62]
tom : 4.51 : 1
Count: 1
java.awt.Rectangle[x=571,y=80,width=25,height=25]
anyone got any ideas why it does this twice? i have also tried this with mousepressed and mousereleased as well as mouseclicked, but the same occurs...You're probably adding the mouseListener to your component twice, but you don't show that part of the code so it's hard to tell for sure.
'i' enclosed in square brackets isn't shown in these forums, but makes things italicClick on the help link at the top of the page. It explains some formatting codes you can use to make your code easier to read.
... - italic
... - highlights java keywords and comments -
Event Handling for Graphic Shapes
Hi guys,
I have a problem on the implementation of a piece of software that i'm making, to be more specific i implement a GUI. In this GUI i draw rectangles, lines and that kind of things.
The problem is that i want when clicking on a rectangle, an event to take place such as the drawing of something else, or a message, etc.
How am i to achieve that? I've tried many things but didn't succeeded it unfortunately. How am i going to "give" life to my rectangles by adding event handling for them? What code should i write?
Note: My class extends JPanel & i'm using paint(Graphics g) for drawing the shapes
Thanks,
John.Try this:
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
public class Shapes extends JFrame
DPanel pan = new DPanel();
public Shapes()
addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent ev)
dispose();
System.exit(0);
setBounds(10,10,400,350);
setContentPane(pan);
setVisible(true);
public class DPanel extends JPanel implements MouseListener
Vector shapes = new Vector();
Shape cs;
public DPanel()
addMouseListener(this);
shapes.add(new Rectangle(20,20,100,40));
shapes.add(new Rectangle(40,80,130,60));
shapes.add(new Line2D.Double(20,150,200,180));
public void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
for (int j=0; j < shapes.size(); j++)
g2.draw((Shape)shapes.get(j));
g.setColor(Color.red);
if (cs != null) g2.draw(cs);
public void mouseClicked(MouseEvent m) {}
public void mouseEntered(MouseEvent m) {}
public void mouseExited(MouseEvent m) {}
public void mouseReleased(MouseEvent m){}
public void mousePressed(MouseEvent m)
for (int j=0; j < shapes.size(); j++)
Shape s = (Shape)shapes.get(j);
Rectangle r = new Rectangle(m.getX()-1,m.getY()-1,2,2);
if (s.intersects(r))
cs = s;
repaint();
public static void main (String[] args)
new Shapes();
}Noah -
I am very new to Swing....I am very confused about how event handling works. I created a button called "remove" and a list. When a user selects an item in the list and then clicks on the remove button, then the item should be deleted from the list. I am able to display the list and the button. I create a listener for the button in a separate class as follows:
class MyActionListener implements ActionListener
public void actionPerformed (ActionEvent e)
if(e.getActionCommand().equals("remove"))
{System.out.println("remove works");
Now my problem is ..how do i access the list in this class..because my list is set up in the other class (main class). Because if i try to do anything with the list in this class it shows the compile time error saying it cannot identify what list is. Please tell me how i can use the list in the MyActionListener class. Here is the code that sets up the list:
public abstract class VetNet extends JFrame implements ListSelectionListener
static DefaultListModel listM= new DefaultListModel();
static DefaultListModel listModel;
public static void main (String[] args)throws IOException
JPanel panel= new JPanel();
JLabel j=new JLabel("Welcome");
panel.add(j,BorderLayout.NORTH);
BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
StringTokenizer reader;
reader=new StringTokenizer(stdin.readLine());
String first_name=reader.nextToken();
while(!first_name.equals("end"))
{ String last_name=reader.nextToken();
add_name(first_name,last_name);
reader=new StringTokenizer(stdin.readLine());
first_name=reader.nextToken();
}//while
DefaultListModel listModel=new DefaultListModel();
listModel=return_fname();
String first= (String)(listModel.firstElement());
JList sampleJList= new JList(listModel);
sampleJList.setVisibleRowCount(2);
// sampleJList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
//sampleJList.setSelectedIndex(0);
//sampleJList.addListSelectionListener(sampleJList);
JScrollPane listPane=new JScrollPane(sampleJList);
panel.setBorder(BorderFactory.createEmptyBorder(60,60,30,60));
panel.add(listPane);
JButton b1=new JButton("add");
panel.add(b1);
JButton b2=new JButton("remove");
panel.add(b2);
JButton b3=new JButton("edit");
panel.add(b3);
JFrame frame = new JFrame ("VetNet");
frame.getContentPane().add(panel);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing (WindowEvent e) { System.exit(0); }
frame.pack ();
frame.setVisible(true);
//MyActionListener myListener= new MyActionListener();
b1.addActionListener(new MyActionListener());
b2.addActionListener(new MyActionListener());
b3.addActionListener(new MyActionListener());
//sampleJList.addActionListener(new MyActionListener());
}//main
private static void add_name(String f_name, String l_name)
listM.addElement(l_name+ ", " + f_name);
}//method add_fname
private static DefaultListModel return_fname()
return listM;
}//method return_fnameOk! This is the LONG answer, but I think you would benefit from reading it all.
Making something public means that it can be accessed from other classes; however, it must be accessed using an object(instance) of that class. This means, if I have a class MyJFrame that extends JFrame, then in another class, I can do this:
MyJFrame myFrame = new MyJFrame();
myFrame.dispose();
myFrame.isShowing = false;
Given that dispose() is a public method and isShowing is a public boolean variable that's in the MyJFrame object. Note: the opposite of public is private meaning that the variable/function is only accessible within the class. Also, in all my examples, I assume each class has access to the others.(in same Package, or imported)
There are times at which you do not want to call a function on a given object or you want variables that are defined in the CLASS context, not the OBJECT context. As in, I have the class MyJFrame, and I always want to be able to access every object(instance) of this class that I've created. I would accomplish this using a static variable. Define the variable the same place you would define any other variable of the class, but inclued the reserved word "static". As in:
public class MyJFrame{
public static Vector allFrames = new Vector();
then in my contructor, I would add this frame to the vector:
public MyFrame(){
allFrames.add(this);
Now that I have this set up, I can access all the frames I've made from anywhere using MyJFrame.allFrames (note that I use the CLASS name, and I don't have an instance of the object anywhere)
Another use of static is for functions. Going along with the same example, I could add a closeAllJFrames function:
public static void closeAllJFrames(){
for(int x=0; x<allFrames.size(); x++){
allFrames.elementAt(x).dispose();
then I can call this function from any other class using: MyJFrame.closeAllJFrames();
Also worth noting, this function could be placed in any other class(other than inner classes, which cannot have static functions), you'd just need to put MyJFrame. in front of the allFrames.
One last tip is: If you use code like I've shown, consider using a Hashtable instead of a Vector if you need to access certain frames(or whatevers) from afar. This will keep you from iterating thru the Vector and will decrease overhead significantly.
Hope this helps
--Zephryl
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