I have programatically created input fields on my jframe. Now I want to create a save button that will save ALL the results to a database. I am a beginner with JAVA thus not familiar. I have a entity object for the results, and a controler to save to database. This is not the problem but my problem is writing the event handler.
private void jComboBoxSurveyFocusLost(java.awt.event.FocusEvent evt) {
// TODO add your handling code here:
EntityManagerFactory emf = Persistence.createEntityManagerFactory("PTSchemePU");
EntityManager em = emf.createEntityManager();
jPanelTests.setLayout(new GridLayout(0, 1));
Query surveyQ = em.createNamedQuery("Survey.findBySurveyDescription");
surveyQ.setParameter("surveyDescription", jComboBoxSurvey.getSelectedItem().toString());
Survey survey = (Survey) surveyQ.getSingleResult();
int testset_ID = survey.getTestset();
Query testsetQ = em.createNamedQuery("TestsetV.findByTestSet");
testsetQ.setParameter("testsetid", testset_ID);
List<TestsetV> TestSetList = (List<TestsetV>)testsetQ.getResultList();
totalTests = TestSetList.size();
JPanel[] myPanel = new JPanel[totalTests];
JLabel[] myTestID = new JLabel[totalTests];
JTextField [] mytextfield = new JTextField[totalTests];
JComboBox[] myCombo = new JComboBox[totalTests];
JCheckBox[] myNotReturn = new JCheckBox[totalTests];
JCheckBox[] myNotEval = new JCheckBox[totalTests];
JComboBox[] myReason = new JComboBox[totalTests];
JButton[] mySave = new JButton[totalTests];
jLabelTestcount.setText(Integer.toString(totalTests));
jLabelToberesulted.setText(Integer.toString(totalTests));
for (int tst=0; tst< TestSetList.size(); tst++) {
myPanel[tst] = new JPanel();
myTestID[tst] = new JLabel();
mytextfield[tst] = new JTextField();
myNotReturn[tst] = new JCheckBox("Not Returned");
myNotEval[tst] = new JCheckBox("Not Evaluated");
myReason[tst] = new JComboBox();
mySave[tst] = new JButton("Save");
Query qR = em.createNamedQuery("Lookups.findByLookupType");
qR.setParameter("lookupType","REAS");
java.util.List<Lookups> reasonList = (java.util.List<Lookups>)qR.getResultList();
for (int i = 0 ; i < reasonList.size(); i++) {
Lookups lu = reasonList.get(i);
myReason[tst].addItem(lu.getLookupDescription());
}
myPanel[tst].setLayout(new SpringLayout());
int rows =1;
int cols = 5;
myPanel[tst].setSize(10, 10);
myPanel[tst].setBorder(javax.swing.BorderFactory.createBevelBorder(javax.swing.border.BevelBorder.RAISED));
myPanel[tst].setVisible(true);
jPanelTests.add(myPanel[tst]);
mytextfield[tst].setSize(10, 10);
myNotReturn[tst].setName("No Return");
myNotEval[tst].setName("Not Evauated");
JLabel testName = new JLabel(TestSetList.get(tst).getTestDesctiption());
myPanel[tst].add(new JLabel(Integer.toString(TestSetList.get(tst).getTestsId())));
myPanel[tst].add(testName);
switch (TestSetList.get(tst).getTestSetup()){
case "TEXT" : {
myPanel[tst].add(mytextfield[tst]);
break;
}
case "COMB" : {
Query q = em.createNamedQuery("Lookups.findByLookupType");
q.setParameter("lookupType",TestSetList.get(tst).getLookup() );
java.util.List<Lookups> lookupList = (java.util.List<Lookups>)q.getResultList();
for (int i = 0 ; i < lookupList.size(); i++) {
Lookups lu = lookupList.get(i);
cb.addItem(lu.getLookupCode());
}
myPanel[tst].add(cb);
break;
}
case "SPIN" : {
myPanel[tst].add(sp);
break;
}
} // end switch
myPanel[tst].add(myNotReturn[tst]);
myPanel[tst].add(myNotEval[tst]);
myPanel[tst].add(myReason[tst]);
myPanel[tst].add(mySave[tst]);
SpringUtilities.makeCompactGrid(myPanel[tst], 1, myPanel[tst].getComponentCount(),6,6,6,6);
}
pack();
jPanelTests.setVisible(true);
}
I then created a event handeler when the panel loses focus
myPanel[tst].addFocusListener(new FocusListener() {
#Override
public void focusGained(FocusEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
#Override
public void focusLost(FocusEvent e) {
myResults[tst].setResultValue(mytextfield[tst].getText());
}
});
But now I get a error (local variables refferenced from an inner classmust be final of effectivly final) on the line myResults[tst].setResultValue(mytextfield[tst].getText());
How can I reference to the value entered in the jTextField/JComboBox/jSpinner
Thanks
Your counter variable tst is not final (meaning no final keyword is used), nor effectively final (meaning it is modified), and as such, it cannot be referensed from an inner class - in your case an instance of FocusListener.
You cannot mark tst as final, as you modify it - but you can create a new variable in the body of the loop.
Note that effecively final concept is new to Java8, in earlier versions you had to be explicit and add final keyword to all local variables accessed from inner class.
Study the example below:
public class TestFinalVariables {
public static void main(String[] args) {
String effectivelyFinal = "aaa";
for (int tst=0; tst< 10; ++tst) {
final int j = tst; //explicit final not necessary here
new Runnable() {
#Override
public void run() {
System.out.println(effectivelyFinal);
System.out.println(j);
//System.out.println(tst); Won't compile
}
}.run();
}
}
}
Related
I am creating a dumb phone (like old traditional phone) and I'm using GUI programming. I need help with dialing the numbers. I don't know how to get the numbers to pop up on the display and stay there, and also use the delete button to delete the numbers that is up on the display too. I will post a youtube link so you can see a sample run.
I am currently stuck on passing the text from the button of each number that should display the number, however it's displaying the text of the button. I also, don't know how to keep the number there when other buttons are pressed without it being reset.
Here is my code:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Date;
import javax.swing.*;
public class DumbPhone extends JFrame
{
private static final long serialVersionUID = 1L;
private static final int WIDTH = 300;
private static final int HEIGHT = 500;
private static final String CALL_BUTTON_TEXT = "Call";
private static final String TEXT_BUTTON_TEXT = "Text";
private static final String DELETE_BUTTON_TEXT = "Delete";
private static final String CANCEL_BUTTON_TEXT = "Cancel";
private static final String SEND_BUTTON_TEXT = "Send";
private static final String END_BUTTON_TEXT = "End";
private static final String CALLING_DISPLAY_TEXT = "Calling...";
private static final String TEXT_DISPLAY_TEXT = "Enter text...";
private static final String ENTER_NUMBER_TEXT = "Enter a number...";
private JTextArea display;
private JButton topMiddleButton;
private JButton topLeftButton;
private JButton topRightButton;
private JButton[] numberButtons;
private JButton starButton;
private JButton poundButton;
private boolean isNumberMode = true;
private String lastPressed = "";
private int lastCharacterIndex = 0;
private Date lastPressTime;
public DumbPhone()
{
setTitle("Dumb Phone");
setSize(WIDTH, HEIGHT);
setDefaultCloseOperation(EXIT_ON_CLOSE);
createContents();
setVisible(true);
topLeftButton.setEnabled(false);
}
private void createContents()
{
//create JPanel, and JTextArea display
JPanel panel = new JPanel(new GridLayout(5,3));
display = new JTextArea();
display.setPreferredSize(new Dimension(280, 80));
display.setFont(new Font("Helvetica", Font.PLAIN, 32));
display.setLineWrap(true);
display.setEnabled(false);
panel.add(display);
//create JButtons
topLeftButton = new JButton(DELETE_BUTTON_TEXT);
topMiddleButton = new JButton((CALL_BUTTON_TEXT));
topRightButton = new JButton((TEXT_BUTTON_TEXT));
numberButtons = new JButton[10];
numberButtons[1] = new JButton("<html><center>1<br></center></html>");
numberButtons[2] = new JButton("<html><center>2<br>ABC</center></html>");
numberButtons[3] = new JButton("<html><right>3<br>DEF</right></html>");
numberButtons[4] = new JButton("<html><center>4<br>GHI</center></html>");
numberButtons[5] = new JButton("<html><center>5<br>JKL</center></html>");
numberButtons[6] = new JButton("<html><center>6<br>MNO</center></html>");
numberButtons[7] = new JButton("<html><center>7<br>PQRS</center></html>");
numberButtons[8] = new JButton("<html><center>8<br>TUV</center></html>");
numberButtons[9] = new JButton("<html><center>9<br>WXYZ</center></html>");
numberButtons[0] = new JButton("<html><center>0<br>space</center></html>");
poundButton = new JButton("#");
starButton = new JButton("*");
//add JButtons to buttons JPanel
panel.add(topLeftButton);
panel.add(topMiddleButton);
panel.add(topRightButton);
panel.add(numberButtons[1]);
panel.add(numberButtons[2]);
panel.add(numberButtons[3]);
panel.add(numberButtons[4]);
panel.add(numberButtons[5]);
panel.add(numberButtons[6]);
panel.add(numberButtons[7]);
panel.add(numberButtons[8]);
panel.add(numberButtons[9]);
panel.add(starButton);
panel.add(numberButtons[0]);
panel.add(poundButton);
//add Listener instance (inner class) to buttons
topLeftButton.addActionListener(new Listener());
topMiddleButton.addActionListener(new Listener());
topRightButton.addActionListener(new Listener());
//JButton[] array = new JButton[10];
for (int i = 0; i < numberButtons.length; i++)
{
numberButtons[i].addActionListener(new Listener());
numberButtons[i] = new JButton(String.valueOf(i));
}
starButton.addActionListener(new Listener());
poundButton.addActionListener(new Listener());
//add display and buttons to JFrame
setLayout(new BorderLayout());
add(display, BorderLayout.NORTH);
add(panel, BorderLayout.CENTER);
}
private class Listener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == topLeftButton)
{
if(lastPressTime == null)
{
display.setText(ENTER_NUMBER_TEXT);
}
else
{
topLeftButton.setEnabled(true);
lastCharacterIndex--;
lastPressed = lastPressTime.toString();
}
}
else if(e.getSource() == topMiddleButton)
{
if(lastPressTime == null || lastCharacterIndex == 0)
{
display.setText(ENTER_NUMBER_TEXT);
}
else
{
display.setText(CALLING_DISPLAY_TEXT);
}
}
else if(e.getSource() == topRightButton)
{
if(lastPressTime == null || lastCharacterIndex == 0)
{
display.setText(TEXT_DISPLAY_TEXT);
}
else
{
display.setText(CALLING_DISPLAY_TEXT);
}
}
else
{
topLeftButton.setEnabled(true);
if (e.getSource() instanceof JButton)
{
//String text = ((JButton) e.getSource()).getText();
display.setText(lastPressed + " f" + numberButtons[lastCharacterIndex].getText());
}
}
Date currentPress = new Date();
long currentTime = currentPress.getTime();
if(lastPressTime != null)
{
//long lastPressTime = lastPressTime.getTime();
//subtract lastPressTime from currentPress time to find amount of time elapsed since last button pressed.
}
lastPressTime = currentPress;
String buttonLetters = ""; // Parse Letter from button (e.g "abc").
//update lastCharacterIndex.
lastCharacterIndex++;
lastCharacterIndex = lastCharacterIndex % buttonLetters.length();
}
}
for example, if I push the button 2, instead of giving me "2", it will give me < html>< center>2ABC < / center >< / html >
Therefore, I need help with
Having the numberButtons, when pushed to show the numbers that were pushed.
Be able to delete those numbers.
Here is the link to the sample run: https://www.youtube.com/watch?v=evmGWlMSqqg&feature=youtu.be
Try starting the video 20 seconds in.
to delete the number, you can use the labelname.setText("")
At a basic level, you simply want to maintain the "numbers" separately from the UI. This commonly known as a "model". The model lives independently of the UI and allows the model to be represented in any number of possible ways based on the needs of the application.
In your case, you could use a linked list, array or some other simple sequential based list, but the easiest is probably to use a StringBuilder, as it provides the functionality you require (append and remove) and can make a String very simply.
So, the first thing you need to do is create an instance of model as an instance level field;
private StringBuilder numbers = new StringBuilder(10);
this will allow the buffer to be accessed any where within the instance of the class.
Then you need to update the model...
else
{
topLeftButton.setEnabled(true);
if (e.getSource() instanceof JButton)
{
String text = numberButtons[lastCharacterIndex].getText();
numbers.append(text);
}
}
To remove the last character you can simply use something like...
if (numbers.length() > 0) {
numbers.deleteCharAt(numbers.length() - 1);
}
Then, when you need to, you update the UI using something like...
display.setText(numbers.toString());
Now, this is just basic concepts, you will need to take the ideas and apply it to your code base
I have two JTextField which take numbers from users, like this:
nbMuscle = new JTextField();
nbMuscle.setText("2");
and this:
nbFuyard = new JTextField();
nbFuyard.setText("1");
my JTextArea() takes make an addition of both JTextField's values, like this:
nbPersonnages = new JTextArea();
int nombMusc = Integer.valueOf(nbMuscle.getText());
int nombFuy = Integer.valueOf(nbFuyard.getText());
int nbTotal = nombMusc + nombFuy;
nbPersonnages.setText(String.valueOf(nbTotal));
It works like a charm but I have one problem, if the user edit one of the JTextFields, the JTextArea value don't change. I have found on internet some notions like jTextArea.appened(String str) but it doesn't work.
Any idea of what I could do?
You have to add a DocumentListener to the underlying Document of the TextFields to listen to changes made while the program runs.
The easiest way to do this is proboably an anonymous class.
Here is the Code:
nbMuscle = new JTextField();
nbMuscle.setText("2");
nbFuyard = new JTextField();
nbFuyard.setText("1");
nbPersonnages = new JTextArea();
DocumentListener dl = new DocumentListener() {
#Override
public void removeUpdate(DocumentEvent e) {
textChanged();
}
#Override
public void insertUpdate(DocumentEvent e) {
textChanged();
}
#Override
public void changedUpdate(DocumentEvent e) {
// This method is not called when the text of the Document changed, but if attributes of the Document changed.
}
private void textChanged() {
int nombMusc = Integer.valueOf(nbMuscle.getText());
int nombFuy = Integer.valueOf(nbFuyard.getText());
int nbTotal = nombMusc + nombFuy;
nbPersonnages.setText(String.valueOf(nbTotal));
}
};
int nombMusc = Integer.valueOf(nbMuscle.getText());
int nombFuy = Integer.valueOf(nbFuyard.getText());
int nbTotal = nombMusc + nombFuy;
nbPersonnages.setText(String.valueOf(nbTotal));
nbMuscle.getDocument().addDocumentListener(dl);
nbFuyard.getDocument().addDocumentListener(dl);
I'm creating a program that reads data from a file, displays it on a GUI that has a JList and JButtons. I am trying to write it with CardLayout so the appropriate JPanel can be displayed when an item is selected from the JList or a JButton is clicked (i.e. next, previous, first and last). I am able to successfully read from the file and display data to the GUI. I've run into 2 problems and I've tried searching online for answers but cant seem to figure it out:
1) How do I get the JPanels to switch using CardLayout?
2) How do I get the data to be displayed in the GUI in text fields when a user clicks an item from the JList? The JList does appear and my ListSelectionListener is working because when I click on a particular item, it will print to the console (as a test).
If I comment out all of the JPanels except for 1, then it is correctly displayed but when I place all of them, then it does not switch.
So far, I have this for my ListSelectionListener (as an inner class):
public class CancerSelectionListener implements ListSelectionListener {
#Override
public void valueChanged(ListSelectionEvent e) {
Integer selection = (Integer)(((JList) e.getSource()).getSelectedIndex());
if(selection == 0) {
System.out.println("blah"); // works
// switch to the corresponding JPanel in CardLayout
}
}
}
String[] tester;
String teste;
listModel = new DefaultListModel();
for(int i = 0; i < 36; i++) {
tester = _controller.readCancer(i); // reads from the file, this part works!
teste = tester[0];
listModel.addElement(teste);
}
cancerList = new JList(listModel);
cancerList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
cancerList.setSelectedIndex(-1);
cancerList.setVisibleRowCount(5);
cancerListScroller = new JScrollPane(cancerList);
CardLayout myCardLayout;
myCardLayout = new CardLayout();
mainPanel2.setLayout(myCardLayout);
myCardLayout.show(mainPanel2, "test");
CancerPanels.aplPanel apl = new CancerPanels.aplPanel();
CancerPanels.fcPanels fc = new CancerPanels.fcPanels();
CancerPanels.vhlsPanels vhls = new CancerPanels.vhlsPanels();
CancerPanels.pdgPanels pdg = new CancerPanels.pdgPanels();
CancerPanels.cebpaPanels cebpa = new CancerPanels.cebpaPanels();
mainPanel2.add(apl.aplReturn(), "test");
mainPanel2.add(fc.fcReturn());
mainPanel2.add(vhls.vhlsReturn());
mainPanel2.add(pdg.pdgReturn());
mainPanel2.add(cebpa.cebpaReturn());
// I have 37 JPanels that are placed in the JPanel that uses CardLayout but I didn't post all of them as it would take up lots of space
The data for each JPanel is populated from static inner classes in the CancerPanels class (only showing 1 as each is very long!)
public class CancerPanels extends CancerGUI {
static JPanel cards;
static CancerController _cons = new CancerController();
static String[] cancerData;
static JScrollPane treatmentsScroller = new JScrollPane(txtTreatments, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
static JScrollPane causesScroller = new JScrollPane(txtCauses, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
static JScrollPane symptomsScroller = new JScrollPane(txtSymptoms, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
public static class aplPanel extends JPanel {
public JPanel aplReturn() {
treatmentsScroller.setViewportView(txtTreatments);
txtTreatments.setEditable(false);
causesScroller.setViewportView(txtCauses);
txtCauses.setEditable(false);
symptomsScroller.setViewportView(txtSymptoms);
txtSymptoms.setEditable(false);
cards = new JPanel(new GridLayout(6,1));
cancerData = _cons.readCancer(0);
resultName.setText(cancerData[0]);
txtSymptoms.setText(cancerData[1]);
txtCauses.setText(cancerData[2]);
txtTreatments.setText(cancerData[3]);
resultRate.setText(cancerData[4]);
resultPrognosis.setText(cancerData[5]);
cards.add(resultName);
cards.add(symptomsScroller);
cards.add(causesScroller);
cards.add(treatmentsScroller);
cards.add(resultRate);
cards.add(resultPrognosis);
return cards;
}
}
Edit:
Here is my most recent attempt. I can scroll through the JList but it doesn't properly display the correct corresponding JPanel (in fact it doesn't display anything, except whenever I click the last button, I don't know why that button works). I successfully managed to place an ItemListener on a JComboBox but ultimately, I want the CardLayout to work. Our instructor provided us with sample code to use but when I try it, the JPanels do not switch (or if they do they're hidden, not sure why).
Each of my listeners are public inner classes in the overall CancerGUI class.
public CancerGUI() {
CancerPanels.aplPanel apl = new CancerPanels.aplPanel();
CancerPanels.fcPanels fc = new CancerPanels.fcPanels();
CancerPanels.vhlsPanels vhls = new CancerPanels.vhlsPanels();
// more than 30 JPanels that I add to the JPanel that uses CardLayout, so I only posted 3
// each of them uses the GridLayout
mainPanel2 = new JPanel(new CardLayout());
mainPanel2.add(apl.aplReturn(), "1");
mainPanel2.add(fc.fcReturn(), "2");
mainPanel2.add(vhls.vhlsReturn(), "3");
CancerActionButtons _cab = new CancerActionButtons();
btnNext = new JButton("Next");
btnPrevious = new JButton("Previous");
btnFirst = new JButton("First");
btnLast = new JButton("Last");
btnClear = new JButton("Clear");
btnNext.addActionListener(_cab);
btnPrevious.addActionListener(_cab);
btnFirst.addActionListener(_cab);
btnLast.addActionListener(_cab);
CancerItemListener _item = new CancerItemListener(); // this listener works!
renalC.addItemListener(_item);
skinC.addItemListener(_item);
brainC.addItemListener(_item);
bladderC.addItemListener(_item);
ovarianC.addItemListener(_item);
pancC.addItemListener(_item);
breastC.addItemListener(_item);
String[] tester;
String teste;
listModel = new DefaultListModel();
for(int i = 0; i < 36; i++) {
tester = _controller.readCancer(i);
teste = tester[0];
listModel.addElement(teste);
}
cancerList = new JList(listModel);
cancerList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
cancerList.setSelectedIndex(-1);
cancerList.setVisibleRowCount(5);
cancerListScroller = new JScrollPane(cancerList);
ListSelection _list = new ListSelection();
cancerList.addListSelectionListener(_list);
JScrollPane treatmentsScroller = new JScrollPane(txtTreatments, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
treatmentsScroller.setViewportView(txtTreatments);
JScrollPane causesScroller = new JScrollPane(txtCauses, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
causesScroller.setViewportView(txtCauses);
JScrollPane symptomsScroller = new JScrollPane(txtSymptoms, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
symptomsScroller.setViewportView(txtSymptoms);
public class ListSelection implements ListSelectionListener {
#Override
public void valueChanged(ListSelectionEvent e) {
String selection = (String)(((JList)e.getSource()).getSelectedValue());
((CardLayout) mainPanel2.getLayout()).show(mainPanel2, selection);
((CardLayout) mainPanel2.getLayout()).show(mainPanel2, selection);
}
}
public class CancerActionButtons implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
switch(e.getActionCommand()) {
case "First":
((CardLayout) mainPanel2.getLayout()).first(mainPanel2);
cancerCount = 1;
break;
case "Last":
((CardLayout) mainPanel2.getLayout()).last(mainPanel2);
cancerCount = 11;
break;
case "Previous":
((CardLayout) mainPanel2.getLayout()).previous(mainPanel2);
cancerCount--;
cancerCount = cancerCount < 1 ? 11 : cancerCount;
break;
case "Next":
((CardLayout) mainPanel2.getLayout()).next(mainPanel2);
cancerCount++;
cancerCount = cancerCount > 11 ? 1 : cancerCount; //
break;
}
cancerList.setSelectedIndex(cancerCount-1);
}
}
/**
* Inner class that responds to any user interaction with a JComboBox for
* general types of cancers.
*/
public class CancerItemListener implements ItemListener {
#Override
public void itemStateChanged(ItemEvent e) {
JPanel showPanel = new JPanel();
if(e.getStateChange() == ItemEvent.SELECTED) {
String selection = (String) e.getItem();
if(selection.equalsIgnoreCase("skin cancer")) {
CancerPanels.skin skin = new CancerPanels.skin();
showPanel = skin.skinReturn();
} else if (selection.equalsIgnoreCase("bladder cancer")) {
CancerPanels.bladder bladder = new CancerPanels.bladder();
showPanel = bladder.bladderReturn();
} else if (selection.equalsIgnoreCase("pancreatic cancer")) {
CancerPanels.pancreatic pancreatic = new CancerPanels.pancreatic();
showPanel = pancreatic.returnPancreatic();
} else if (selection.equalsIgnoreCase("renal cancer")) {
CancerPanels.renal renal = new CancerPanels.renal();
showPanel = renal.returnRenal();
} else if (selection.equalsIgnoreCase("ovarian cancer")) {
CancerPanels.ovarian ovarian = new CancerPanels.ovarian();
showPanel = ovarian.ovarianReturn();
} else if (selection.equalsIgnoreCase("breast cancer")) {
CancerPanels.breast breast = new CancerPanels.breast();
showPanel = breast.returnBreast();
} else if (selection.equalsIgnoreCase("brain cancer")) {
CancerPanels.brain brain = new CancerPanels.brain();
showPanel = brain.returnBrain();
} else if (selection.equalsIgnoreCase("von hippel-lindau syndrome")) {
CancerPanels.vhlsPanels vhls = new CancerPanels.vhlsPanels();
showPanel = vhls.vhlsReturn();
}
JOptionPane.showMessageDialog(null, showPanel);
}
}
}
Seperate class where the JPanels are made before being added to CardLayout:
public class CancerPanels extends CancerGUI {
static String name;
static JPanel cards;
static CancerController _cons = new CancerController();
static String[] cancerData;
static JScrollPane treatmentsScroller = new JScrollPane(txtTreatments, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
static JScrollPane causesScroller = new JScrollPane(txtCauses, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
static JScrollPane symptomsScroller = new JScrollPane(txtSymptoms, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
public static class aplPanel extends JPanel {
public JPanel aplReturn() {
treatmentsScroller.setViewportView(txtTreatments);
txtTreatments.setEditable(false);
causesScroller.setViewportView(txtCauses);
txtCauses.setEditable(false);
symptomsScroller.setViewportView(txtSymptoms);
txtSymptoms.setEditable(false);
cards = new JPanel(new GridLayout(6,1));
cancerData = _cons.readCancer(0);
resultName.setText(cancerData[0]);
txtSymptoms.setText(cancerData[1]);
txtCauses.setText(cancerData[2]);
txtTreatments.setText(cancerData[3]);
resultRate.setText(cancerData[4]);
resultPrognosis.setText(cancerData[5]);
cards.add(resultName);
cards.add(symptomsScroller);
cards.add(causesScroller);
cards.add(treatmentsScroller);
cards.add(resultRate);
cards.add(resultPrognosis);
return cards;
}
In essence what you are trying to do is to change the state of one class from another.
How this is done with Swing GUI's is no different for how it is done for non-GUI programs: one class calls the public methods of another class.
One key is to have wiring to allow this to occur which means references for one class needs to be available to the other class so that appropriate methods can be called on appropriate references. The devil as they say is in the details.
"1) How do I get the JPanels to switch using CardLayout?" -- So the class that holds the CardLayout could for instance have the public methods, next(), previous(), and perhaps show(SOME_STRING_CONSTANT) or some other swapView(...) method.
"2) How do I get the data to be displayed in the GUI in text fields when a user clicks an item from the JList?" -- This will involve the use of listeners -- the class holding the JTextFields will listen for notification from the class that holds the JList, and when notified gets the necessary information from the list-displaying class. A PropertyChangeListener could work well here.
e.g.,
public class CancerSelectionListener implements ListSelectionListener {
private CardDisplayingView cardDisplayingView = null;
public CancerSelectionListener(CardDisplayingView cardDisplayingView) {
this.cardDisplayingView = cardDisplayingView;
}
#Override
public void valueChanged(ListSelectionEvent e) {
int selection = ((JList) e.getSource()).getSelectedIndex();
if(selection == 0) {
if (cardDisplayingView != null) {
cardDisplayingView.swapView(...);
}
}
}
}
Hey I'm a little new here so my apologies if I messed something up in my post. Anyways the problem I'm having has to deal with arrays, what I'm trying to do basically is use the String[] arrays to populate my form and display it on screen and then have the getForm() function return a String[] with the title of the form and the info in text[i]. This all works fine until I use use the button I added to call the getForm() function and I change to a different form (createForm() attached to ListListener) and all the labels appear as whatever was returned in the getForm() function. I'm pretty sure it has something to do with the way I'm using my arrays but I thought they would be set back to normal after I chose another list item which goes through the createForm() function again resetting the arrays, so I'm not sure whats going on.
Thanks
I've included a screenshot of what I'm referring too bellow as well.
http://www.majhost.com/gallery/adc90/afsd/error.png
class Form extends JPanel
{
//Arrays for the forms
private String[] com = {"Communication","ICAO","Type","Frequency"};
private String[] fuel = {"Fuel","ICAO","Type"};
private String[] runway = {"Runway","ICAO","Number","Type","Length"};
private String[] airplane = {"Airplane","Make","Model","Type","Fuel Capacity", "Fuel Burn Rate", "Air Speed"};
private String[] airport = {"Airplane","ICAO","Name","Longitude","Latitude","crFreq","crType", "Fuel Type"};
//Declare variables
private JTextField[] text;
private String[] formReturn;
private String[] formArray;
private JButton submit,clear;
public Form()
{
createForm("Airplane");
}
public void createForm(String choice)
{
removeAll();
if(choice.equals("Communication"))
{
formArray = com;
}
else if(choice.equals("Fuel"))
{
formArray = fuel;
}
else if(choice.equals("Airplane"))
{
formArray = airplane;
}
else if(choice.equals("Airport"))
{
formArray = airport;
}
else if(choice.equals("Runway"))
{
formArray = runway;
}
int l = formArray.length + 1;
text = new JTextField[l];
//Layout info
GridLayout grid = new GridLayout(l,2);
grid.setHgap(0);
setLayout(grid);
//Set label
add(new JLabel(formArray[0]));
add(new JLabel(""));
for(int i = 1; i < formArray.length; ++i)
{
add(new JLabel(formArray[i]));
add(text[i] = new JTextField(20));
}
//Add in the buttons and the actionlisteners
submit = new JButton("Create");
clear = new JButton("Delete");
add(clear);
clear.addActionListener(new Button());
add(submit);
submit.addActionListener(new Button());
updateUI();
}
//Get form info
//This works so far
public String[] getForm()
{
formReturn = formArray;
formReturn[0] = formArray[0];
for(int i = 1; i < formReturn.length; i++)
formReturn[i] = text[i].getText();
return formReturn;
}
//Clear form
public void clearForm()
{
for(int i = 1; i < formArray.length; i++)
text[i].setText("");
}
}
public String[] getForm()
{
formReturn = formArray; /* (0) */
formReturn[0] = formArray[0];
for(int i = 1; i < formReturn.length; i++)
formReturn[i] = text[i].getText(); /* (1) */
return formReturn;
}
Look at line (1): you modify formReturn array which points to labels text. formReturn -> formArray -> com.
To fix it just create new String array at (0):
formReturn = new String[formArray.length];
First of all i am brand new to Java : /
I have been trying to solve this problem on my own for about 2 days now but cant get around it the problem is i am trying to implement a variable change listener. I have tried without successes to implement Observer and Observable to my project but whit no successes at best i came up by wrapping some elements of the code in to while loops but that well fails.
Any how this is my class and if you look at it i have some global variables defined after the constructor i need to listen for a change in all of those global variables if one changes i would like to execute a method.
I have been told JavaFX has methods that can listen to variables can someone confirm this.
Anyhow thanks for help in advance.
public class Tower_Controller {
public Tower_Controller() {
}
//Global variables
String isSelected = null;
int hasModules = 0;
int cap_s = 0;
int cpu_s = 0;
int cap = 0;
int cpu = 0;
int shield = 0;
int armor = 0;
double em = 00.00;
double th = 00.00;
double ki = 00.00;
double ex = 00.00;
public void invoke() {
Invoke_GUI runnable = new Invoke_GUI();
final JLabel tower_name = runnable.tower_name;
final JComboBox tower_select = runnable.tower_select;
final JTree module_browser = runnable.module_browser;
final JTree selected_modules = runnable.selected_modules;
final JProgressBar cap_bar = runnable.cap_bar;
final JProgressBar cpu_bar = runnable.cpu_bar;
final JLabel em_res = runnable.em;
final JLabel th_res = runnable.thermic;
final JLabel ki_res = runnable.kinetic;
final JLabel ex_res = runnable.explosive;
tower_select.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (isSelected != null) {
Events evt = new Events();
evt.towerSelected(isSelected);
} else {
tower_name.setText(tower_select.getSelectedItem().toString());
isSelected = tower_name.toString();
}
}
});
removeTower(tower_name);
runnable.setVisible(true);
}
public void updateValues(final JProgressBar cap_bar, final JProgressBar cpu_bar, final JLabel em_res,
final JLabel th_res, final JLabel ki_res, final JLabel ex_res){
cap_bar.setMaximum(cap);
cap_bar.setString(cap_s + " / " + cap);
cap_bar.setStringPainted(true);
cpu_bar.setMaximum(cpu);
cpu_bar.setString(cpu_s + " / " + cpu);
cpu_bar.setStringPainted(true);
String em_v = String.valueOf(em);
em_res.setText(em_v);
String th_v = String.valueOf(th);
th_res.setText(th_v);
String ki_v = String.valueOf(ki);
ki_res.setText(ki_v);
String ex_v = String.valueOf(ex);
ex_res.setText(ex_v);
}
public void updateList(final ArrayList<String> nodes, final JTree selected_modules) {
DefaultMutableTreeNode nod = new DefaultMutableTreeNode();
for (int i = 0; i < nodes.size(); i++) {
nod.add(new DefaultMutableTreeNode(nodes.get(i)));
}
selected_modules.setModel(new DefaultTreeModel(nod));
}
public void removeTower(final JLabel tower_name) {
tower_name.addMouseListener(new MouseListener() {
#Override
public void mouseClicked(MouseEvent e) {
if (hasModules == 1 & isSelected != null) {
Events evt = new Events();
evt.towerHasModules();
} else if (isSelected == null) {
} else {
tower_name.setText("No Control Tower selected");
isSelected = null;
}
}
#Override
public void mousePressed(MouseEvent e) {
}
#Override
public void mouseReleased(MouseEvent e) {
}
#Override
public void mouseEntered(MouseEvent e) {
}
#Override
public void mouseExited(MouseEvent e) {
}
});
}
public JLabel setTowerName(JLabel a, String name) {
a.setText(name);
return a;
}
}
The general procedure to be notified of a change to a variable is as follows:
First, make the variables private.
Create two methods for each variable, one which sets its value to an argument (often called setX(), where X is the variable name), the other which retrieves its value (getX())
Everywhere you need to read or set the variable, call the methods instead.
In the setX() method, call notifyObserver() on your Observers, in a loop.
And there you go! Now every time the variable is changed, registered Observers are notified. The key part of this solution is that the variables have to be private, so that no code can set their values without going through the setX() methods.