how to set JCheckBox to have a check mark, or not within a program

Question

I am using a single JCheckBox as an un-editable indicator for when something happens in my program. Right now I have this:

public void update(Observable o, Object arg) {
    try {

        if (Controller.c.turn.equals(this)) {
            tp.turnCheckBox.setBorderPainted(true);
        }
        else {
            tp.turnCheckBox.setBorderPainted(false);
        }
    } catch (Exception e) {
    }

Basically, instead of painting the turnCheckBox border... I want to have a checkmark in it. It seems like it would be a simple pre-made method, maybe I am missing something but I can't get it to happen.

score 26 · Accepted Answer · answered Dec 07 '11 at 20:07

26

Using tp.turnCheckBox.setSelected (boolean isSelected) will check (or uncheck) the checkbox.

answered Dec 07 '11 at 20:07

Laf

7,965
4
37
52

Thanks, I guess I didn't see that method! – Cheesegraterr Dec 07 '11 at 20:13
Using the poster's sample code: `tp.turnCheckBox.setSelected(Controller.c.turn.equals(this));` – Paul Dec 07 '11 at 20:13
Marcelo raises a good point in his answer, I suggest you take note of it too :o) – Laf Dec 07 '11 at 20:14
1

The OP also wants the checkbox to be not editable (readonly). – Marcelo Dec 07 '11 at 20:15

Marcelo · Answer 2 · 2011-12-07T20:19:12.937

8

To use the checkBox in "readonly" mode, use:

tp.turnCheckBox.setEnabled(false);

To make the checkBox appear checked or not checked, use:

tp.turnCheckBox.setSelected(isSelected);

where isSelected is a boolean expression which indicates if the control is checked or not checked.

edited Dec 07 '11 at 20:19

answered Dec 07 '11 at 20:10

Marcelo

11,218
1
37
51

score 5 · Answer 3 · answered Dec 07 '11 at 20:13

JCheckBox has a method from its super class setSelected(). For your future knowledge and searching, in the Api with these components there is typically a chain of super classes you can go up in search for methods such as these.

JCheckBox has to go up 2 levels of classes to AbstractButton to find the setSelected() method.

Sometimes the fastest way to find something like this is simply with an IDE's autocomplete.

how to set JCheckBox to have a check mark, or not within a program

3 Answers3