How to get the number of jbutton present on jframe

Question

I have this code by which I am trying to count/get the number of jbuttons present on jframe

I have 7 jbuttons and 2 jtext fields on jframe but Output is coming 1

Component c=this;
Container container = (Container) c;
int x = container.getComponentCount();
System.out.println(x);

Can I get some guidance

Probably you have only one `JPanel` inside the container - And that's what `getComponentCount()` is returning. You should get the `JPanel` and `getComponentCount()` on it. — Maroun, Sep 11 '13 at 14:43
http://stackoverflow.com/questions/6495769/how-to-get-all-elements-inside-a-jframe see this question may help in your case — Simmant, Sep 11 '13 at 14:45
I am using JFrame with JList and JTextArea with Jbutton and Jtext Field — user2747954, Sep 11 '13 at 14:51

score 2 · Answer 1 · answered Sep 11 '13 at 14:48

Get all the components in the JFrame(hint: use recursion as done here).

public static List<Component> getAllComponents(final Container c) {
    Component[] comps = c.getComponents();
    List<Component> compList = new ArrayList<Component>();
    for (Component comp : comps) {
      compList.add(comp);
      if (comp instanceof Container) {
        compList.addAll(getAllComponents((Container) comp));
      }
    }
    return compList;
  }

Then test for the components that are jbuttons.

int count =0;
for(Component c : getAllComponents(container)){
  if(c instanceof JButton) count++;
}

score 1 · Answer 2 · answered Sep 11 '13 at 14:45

1

Try to change your first line:

Component c = (your JFrame object);

answered Sep 11 '13 at 14:45

Arash Saidi

2,228
20
36

score 1 · Answer 3 · answered Sep 11 '13 at 14:48

1

You can use Darryl's Swing Utils to recursively search Containers for components.

answered Sep 11 '13 at 14:48

camickr

321,443
19
166
288

score 0 · Answer 4 · answered Sep 11 '13 at 15:18

Sounds like you'd be better counting the components in the hierarchy rather than on a single component, for example:

public static int countSubComponentsOfType(Container container, Class<? extends Component> type){
    int count = 0;
    for(Component component : container.getComponents()){
        if(type.isInstance(component)) count++;
        if(component instanceof Container) 
            count += countSubComponentsOfType((Container)component, type);
    }
    return count;
}

Alternatively, if you genuinely want the components on a JFrame, use the following instead.

frame.getRootPane().getComponentCount();

This is because JFrame always just contains 1 child component, a JRootPane. Anything added to the JFrame is added to the rootpane.

How to get the number of jbutton present on jframe

4 Answers4