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How to count number of JCheckboxes checked?
(4 answers)
Closed 9 years ago.
I was wondering if there was a way to check the number of checkboxes checked in Java. I found plenty of instruction on how to do in in javascript but not Java. Thanks for you help!
A few options that I can think of-
Every time a checkbox is checked, increment a (global) counter in its listener. Decrement the counter when the checkbox is un-checked. So, at any given point in time, you know the number of checkboxes checked
Iterate through all the checkboxes and check how many of them are checked. It would be good if you create a collection of checkboxes that you would be using in your code
If the checkboxes are on different screens or in different classes, then you need to main counter at all places and sum them up whenever you want to know the number of checkboxes checked in your application
Related
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Unfortunately MyApp has stopped. How can I solve this?
(23 answers)
Closed 2 years ago.
I use two edit fields and get their texts in on lick method of a button, but when i click button my app crashed. please help me to resolve this problem.
I am fresh one here, if I make any mistake in uploading my question ignore it
thanks..!
Text Field returns a string, which can be a non-number string.
A try-catch block would help if the method could not parse it into an integer.
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How to disable Button when TextField is empty?
(3 answers)
Closed 3 years ago.
I want to disable the button when the text fields are empty.
I have created two fields with the onKeyReleased property
Sorry i sent it unintentionally.
Something like btn.disableProperty().bind(field.textProperty().isEmpty()) should work.
In the future please add a compilable skeleton and what you have tried so far to your question. That makes it way easier to help.
And welcome to stack overflow!
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Best way to store data between program runs in java?
(11 answers)
How can I save the state of my program and then load it?
(2 answers)
Closed 5 years ago.
For example, if I had checked a JCheckBox when I opened the program, how would I make the it remember the status of the checkbox so that the next time I open up the JFrame, the box stays checked.
I would also like to extend this question to other swing components like radiobuttons, color chooser, etc.
Attempted solution: The only way I can think of it is possibly making a new file so that the program can update and read the status of it and adjust the swing components when opened. However, this is too inefficient. I read online something about cookies but I am not too sure.
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In javaFx, Why do we need to call "getChildren()" when we add an element to a window?
(3 answers)
Closed 5 years ago.
For example if I were to add a line of code such as-
hbox.getChildren().add(calculateButton);
what significance does .getChildren hold and what happens if it not used in a program?
getChildren method is used to get the children components(such as checkboxes, buttons etc) in a container.
In your case, hBox is a container which can contain buttons, spinners etc. So getChildren lists the current components in hBox.
It is basically a list of components currently present in the container. By using add() you are adding a new component in that list.
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How to add a radio button group in a core java program such that only one radio button is selected at one time?
(3 answers)
Closed 6 years ago.
I have a short question for you.
I have 2 checkboxes and I want to: when is the active one, the other should be off.
Tks in advance!
Please use JRadioButtons, that would fulfill your requirement.