Home.... | log in.... | Pub my question! | Sign-up....

Java-index >> Java Essentials >> Java Programming

Cannot get the size of the list

I have made a JList and a browse button, when the user click the button and select the files, then it will show the files in the JList. Here is the code for update the jlist

privatevoid LoadFileList(String path){

addFileList.setModel(addFileListModel);

addFileListModel.addElement(path);

addFileList =new JList(addFileListModel);

}

However, when i check which values are selected, it always show -1 and the size of the list is always 0.

Here is my code

int[] selectedList = addFileList.getSelectedIndices();

int sizeSelected = selectedList.length;//0

Dimension size = addFileList.getSize();//0

I would like to know why the values are always 0 even the list get some elements.

Thank you.

[1049 byte] By [MISa] at [2007-11-27 6:13:51]

«« Do anybody know, if there is a roadmap of Suns compiler as OSS?
»» transfer arrays between classes

# 1

You already know that this is not the correct forum for Swing questions. You even once used the Swing forum. Please in future post your Swing questions into the Swing forum.

You seem to be confused about what selected means. Selected means the items of the Jlist that are selected (highlighted, mouse clicky etc by the user) not all the items as you seem to think.

Why are you not using a FileChooser?

cotton.ma at 2007-7-12 17:22:47 >

top of Java-index,Java Essentials,Java Programming...

# 2

How about try this, (but I really don't get what you are doing):

private void LoadFileList(String path) {

addFileList = new JList(new Vector().add(path));

}

Student_Codera at 2007-7-12 17:22:47 >

# 3

Sorry for that, i will use the swing forum next time.

I know the selectedvalues... and maybe i should describe it in details...

My question is even i selected 2 or 3 of the elements in the list, it still return 0.. i have checked the size of element in the jlist and it also returns 0. However, the jlist is containing elements.. which really confuses me..

in the browse button, i am using filechooser to choose file.. and add the file name to the list by defaultListModel.

Thank you

MISa at 2007-7-12 17:22:47 >

# 4

Here is the full version of my code

public class PhotoGallery extends javax.swing.JApplet {

DropTarget dt = new DropTarget();

DefaultListModel addFileListModel = new DefaultListModel();

DefaultListModel addServerFileModel = new DefaultListModel();;

/** Initializes the applet PhotoGallery */

public void init() {

try {

java.awt.EventQueue.invokeAndWait(new Runnable() {

public void run() {

initComponents();

}

});

} catch (Exception ex) {

ex.printStackTrace();

}

/** This method is called from within the init() method to

* initialize the form.

* WARNING: Do NOT modify this code. The content of this method is

* always regenerated by the Form Editor.

// <editor-fold defaultstate="collapsed" desc=" Generated Code ">

private void initComponents() {

jPanel1 = new javax.swing.JPanel();

filePath = new javax.swing.JTextField();

btnBrowse = new javax.swing.JButton();

btnAdd = new javax.swing.JButton();

brnRemove = new javax.swing.JButton();

jScrollPane1 = new javax.swing.JScrollPane();

addFileList = new javax.swing.JList();

jScrollPane2 = new javax.swing.JScrollPane();

serverFileList = new javax.swing.JList();

status = new javax.swing.JLabel();

filePath.setEditable(false);

btnBrowse.setText("Browse");

btnBrowse.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

btnBrowseActionPerformed(evt);

}

});

btnAdd.setText("Add");

btnAdd.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

btnAddActionPerformed(evt);

}

});

brnRemove.setText("Remove");

brnRemove.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

brnRemoveActionPerformed(evt);

}

});

addFileList.setDragEnabled(true);

jScrollPane1.setViewportView(addFileList);

jScrollPane2.setViewportView(serverFileList);

javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);

jPanel1.setLayout(jPanel1Layout);

jPanel1Layout.setHorizontalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGap(45, 45, 45)

.addComponent(filePath, javax.swing.GroupLayout.PREFERRED_SIZE, 232, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(18, 18, 18)

.addComponent(btnBrowse))

.addGroup(jPanel1Layout.createSequentialGroup()

.addContainerGap()

.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 144, javax.swing.GroupLayout.PREFERRED_SIZE)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)

.addComponent(btnAdd, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(brnRemove, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

.addGap(21, 21, 21)

.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 249, Short.MAX_VALUE))

.addGroup(jPanel1Layout.createSequentialGroup()

.addContainerGap()

.addComponent(status)))

.addContainerGap())

);

jPanel1Layout.setVerticalGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGap(58, 58, 58)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(filePath, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(btnBrowse))

.addGap(24, 24, 24)

.addComponent(status)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 310, Short.MAX_VALUE)

.addGroup(jPanel1Layout.createSequentialGroup()

.addGap(13, 13, 13)

.addComponent(btnAdd)

.addGap(38, 38, 38)

.addComponent(brnRemove))

.addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 310, Short.MAX_VALUE))

.addGap(36, 36, 36))

);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

.addContainerGap(25, Short.MAX_VALUE))

);

}// </editor-fold>

private void brnRemoveActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

status.setText("Removing");

int[] selectedList = addFileList.getSelectedIndices();

int sizeSelected = selectedList.length;

for (int i=0; i<sizeSelected; i++){

try{

AppletContext a = getAppletContext();

URL url = new URL("http://www.abc.com");

a.showDocument(url, "_blank");

}catch (MalformedURLException e){

System.out.println(e.getMessage());

}

private void btnAddActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

status.setText("Adding");

int[] selectedList = addFileList.getSelectedIndices();

int sizeSelected = selectedList.length;

Dimension size = addFileList.getSize();

status.setText(size.toString());

// status.setText(Integer.toString(sizeSelected));

for (int i=0; i><sizeSelected; i++){

try{

AppletContext a = getAppletContext();

URL url = new URL("http://www.abc.com");

a.showDocument(url, "_blank");

}catch (MalformedURLException e){

System.out.println(e.getMessage());

}

private void btnBrowseActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

JFileChooser fc = new JFileChooser();

fc.setMultiSelectionEnabled(true);

fc.setDragEnabled(true);

int retval = fc.showOpenDialog(PhotoGallery.this);

if (retval == JFileChooser.APPROVE_OPTION) {

//... The user selected a file, get it, use it.

File[] files = fc.getSelectedFiles();

String[] fileNames = new String[files.length];

filePath.setText(files[0].getName().toString());

for (int i = 0; i >< files.length; i++) {

fileNames[i] = files[i].getPath();

//System.out.println(fileNames[i]);

LoadFileList(fileNames[i]);

}

MISa at 2007-7-12 17:22:47 >

# 5

Thank you.

What i am trying t do is that.

I want to choose the files (maybe more than one) and the selected files will be displayed in the list. The user can choose the files in the list and click the "add" button to upload the files to the server.

Really thanks for your help.

MISa at 2007-7-12 17:22:47 >

# 6

i tried this beforeaddFileListVector.add(path);addFileList = new JList(addFileListVector);but it doesnt work

MISa at 2007-7-12 17:22:47 >

# 7

Are you aware of the restrictions of Applets when it comes to using files?

cotton.ma at 2007-7-12 17:22:47 >

# 8

i know i need to sign the applet before it can access the file system of the client... i think the problem may not come from here since it has already added into the list and the list should be able to tell if there are anything in the list.

actually i am wondering if it's because i have set the model of the list as DefaultListModel so that causing the error...

I have no ideas about this...

Hope someone can help.

Thank you.

Message was edited by:

MIS

MISa at 2007-7-12 17:22:47 >

Java programming resources: FAQs, tutorials, compiler and browser download sites, documentation, books lists, IDEs, etc.

Cannot get the size of the list

Java Essentials New Topic

Java Essentials Hot Topic

Java Essentials

All Classified