I have added set of integers to a JTextArea for each button click.
what exactly I want is that I want to add all the integers and display in a separate JTextArea,Also I want to ask whether we can access the value of a variable within an action listener outside the action listener.
Here is the code:
private ActionListener listener = new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
if(evt.getActionCommand().equals(t.getText()))
{
onec=one.calone(n);
td.append(Double.toString(onec));
td.append("\n");
}
res=Integer.parseInt(td.getText());
}
};
When the user presses button 't' It will keep on adding the integer 'onec' to
textarea 'td' using append method.And I have stored the result from the action
listener into a variable 'res' of double datatype.
private ActionListener listener2 = new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if(e.getActionCommand().equals(tot.getText()))
{
totd.setText(Double.toString(res));
}
}
};
When the user clicks the button 'tot',It should add all the integers in the
textarea 'td' and display it in the textarea 'totd'.
This code is not working.
Please help me this is the last part of my project.
As I don't know what is not working - it would of been good if you explained more clearly - my guess is...
Instead of Double.toString(onec)
Use String.valueOf(onec)
EDIT: If this is not the case, please elaborate on what your problem is, and a fuller code listing.
converting the contents of the textArea to double does not calculate sum. Try looping throught the first textArea reading each value while calculating the sum
Related
I am creating a small application . In this application I have 5 words. I have one JtextField and JButton.The name of JtextField is set as name1 and JButton name set as next.
I want to set a default word in name1 from 1st word of string array ( from this code I am giving one example is need to see in JtextField is as "me") when application run I want to see the word from String array before the the next button click. how I can set the data to name1?
code is as follows:
String s[]={"me","and","my","friends","are"};
int i=0;
private void nextActionPerformed(java.awt.event.ActionEvent evt) {
if(i>=s.length)
i=0;
name1.setText(s[i]);
i++;
}
Call the method after you created your fields with null as argument as you don't use the argument.
nextActionPerformed(null);
This will simulate that the button is pressed when the program starts up.
Assuming you have a button which has action Listener attached. If not then it should be something like below:
nextButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
nextActionPerformed(e);
// Or move your code here from nextActionPerformed(e)
}
});
//And you can also initialize your text filed with first value of array:
textField.setText(s[0]);
I have a group of loop generated buttons made with this code
this.panelCuerpo.setLayout(new GridLayout(4,5));
for(int i = 1; i<=20; i++){
final JToggleButton b = new JToggleButton(new ImageIcon("/images/available.png"));
panelCuerpo.add(b);
b.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/available1.png")));
b.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt){
if(b.isSelected()){
b.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/busy1.png")));
cantidadBoletas++;
}else{
b.setIcon(new javax.swing.ImageIcon(getClass().getResource("/Images/available1.png")));
cantidadBoletas--;
}
System.out.println(cantidadBoletas);
}
});
}
The problem here is that I can't use setText() to compare later cause there's no property to hide that text. How can I compare it later?
PS. Each button has a consecutive number, it's easy to assign that number. The real problem lies in where to put it.
You could:
Use the Action API, which lets you trigger the selected state of the associated button. This allows you to de-couple the button from the underlying "action" it should take. Take a look at How to Use ActionsHow to Use Actions for more details
Use the actionCommand property of the JButton. This allows you to have some kind of "identifier" associated with the button which is independent of the text
Use an array or List to maintain a reference to the buttons
You can maintain a List<JToggleButton> of JToggleButton and fetch element later by the index. Apart from that instead of adding ActionListener in loop you can implement ActionListener which can be used for all buttons and you just need to write b.addActionListener(this); in loop.
NOTE : better to start from i = 0 instead of 1
Here is my application. It's a wallet to update my money when I spend or get profit. Look it up on image hosting here http://tinypic.com/r/687bdk/8
Is there a way to detect that a cursor has been put into one of the JTextFields? If there is, then could I dispatch a method that would delete whatever is in the other JTextField? There should only be one JTextField with input, it is unacceptable to have inputs in both text fields.
You can add a FocusListener to each textfield i.e.
JTextField myTextField = new JTextField();
myTextField.addFocusListener(new FocusListener() {
#Override
public void focusGained(FocusEvent e) {
//when selected...
}
#Override
public void focusLost(FocusEvent e) {
//when not selected..
}
});
Is there a way to detect that a cursor has been put into one of the JTextfields? If there is, than I could dispatch a method that would delete whatever is in the other JTextField.
As a user I'm not too crazy about that design. I've used accounting type applications before where you have two columns (debit/credit) and a number can only be entered into one.
In those applications the number is not removed on focus, it is removed if a value is entered in the other field. This allows for tabbing between fields on the forum without data disappearing just because focus changes.
To implement this type of functionality you would add a DocumentListener to the Document of the text field. Then whenever text is entered into the Document the listener is invoked and you can clear the text from the other text field.
Check out the section from the Swing tutorial on How to Write a DocumentListener for more information and examples.
It called: CaretListener
jTextArea=new JTextArea();
jTextArea.addCaretListener(new CaretListener(){
public void caretUpdate(CaretEvent e){
//your code
}
}
);
It mainly used when you need to know that your caret position is changed.
I have a panel just with a Jtextfield that only accept numbers. So, when I press enter will load a user profile. this is just to see his profile.
What I want: When I press ENTER again all the profile will be cleared, and when I press the numbers and press ENTER again and load the profile again and again...
My problem: I pressed enter and the profile is cleared (Ok all fine), but when I enter the number and press the ENTER, The numbers are cleared and nothing happens, it is like a loop in matriculaTxt.addKeyListener(new KeyAdapter() { ... }
Sorry for my bad English.
private void matriculaTxtActionPerformed(java.awt.event.ActionEvent evt)
{
String matricula = matriculaTxt.getText().trim();
if (!matricula.matches("[0-9]+")) {
matriculaTxt.setText("");
} else {
fc = new FrequenciaController();
matriculaTxt.setEditable(false);
matriculaTxt.requestFocus();
fc.checkinManual(Integer.parseInt(matricula));
}
// the problem is here.
matriculaTxt.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent evt) {
if (evt.getKeyCode() == KeyEvent.VK_ENTER) {
nomeTxt.setText("");
statusTxt.setText("");
imageLb.setIcon(null);
acessoLabel.setText("");
matriculaTxt.setText("");
observacaoTxt.setText("");
System.err.println("ENTER");
PendenciasTableModel ptm = new PendenciasTableModel();// vazio
pendenciasTabela.setModel(ptm);
matriculaTxt.setEditable(true);
matriculaTxt.requestFocus();
}
}
});
}
What I wanted to do was simple. The user types in the text field their numbers, pressing ENTER: their data are loaded. requestFocus() into the text field and it will not be editable anymore, because when I press Enter again the field will be editable but everything will be deleted, and so on.
First off, you should never use a KeyListener for this sort of thing. Consider instead using either a JFormattedTextField or using a DocumentFilter to prevent non-numeric entry. Next, you should use an ActionLIstener to have the JTextField accept and react to the user's pressing the Enter key.
Edit
You state:
my exact requirements is, when i press ENTER again all data will be cleaned for a new data be inserted.
Why not simply have in your JTextField's ActionLIstener:
#Override
public void actionPerformed(ActionEvent e) {
// get the text
JTextComponent textComp = (JTextComponent) e.getSource();
String text = textComp.getText();
// do what you want with text here
// clear the text
textComp.setText("");
}
Again, you should not use a KeyListener for any of this stuff.
Edit 2
If you want a multi-state action listener, one that reacts differently depending on the state of the program, then give it some if blocks to allow it to react to the state of the JTextField. If the field is empty, do one thing, if it has numbers, do another, if it has text, show a warning and clear it:
#Override
public void actionPerformed(ActionEvent e) {
// get the text
JTextComponent textComp = (JTextComponent) e.getSource();
String text = textComp.getText().trim(); // trim it to rid it of white space
if (text.isEmpty()) {
// code to show a profile
return; // to exit this method
}
// if we're here, the field is not empty
if (!text.matches("[0-9]+")) {
// show a warning message here
} else {
// numeric only data present
// do action for this state
}
// clear the text
textComp.setText("");
}
The key again is to not use a KeyListener, but rather to "listen" for the enter key press with the ActionListener only, but to react differently depending on the state of the program, here likely being depending on what content is present in the JTextField.
I think that your problem that the KeyListener it'll not trigger, it will not execute the code inside it, because whenever you press ENTER it will trigger the matriculaTxtActionPerformed then declared the KeyLister, so the ENTER will effect it.
I'm new in Java swing, and I have a problem. I made for-loop for creating buttons and now I want automatically give them names or some kind of marks for future recognition (I will need name of clicked button to make it a variable).
How can I give them names in my loop? Thank you.
Here is code of my for-loop:
for (int aa=1; aa<65; aa++)
{
JButton button = new SquareButton("");
gui.add(button);
button.addActionListener((ActionListener) button);
}
I will need name of clicked button to make it a variable).
You don't need a variable to work with the clicked button. Instead you get a reference to the button that was clicked from the ActionListener code:
public void actionPerformed(ActionEvent e)
{
JButton button = (JButton)e.getSource();
// do processing on the clicked button.
}