How can I make the last fourth checkbox go into disabled mode after the first three of any checkboxes have been clicked?

Question

Java

As far as I understand, a function can be attached to an android checkbox only through setOnCheckedChangeListener or by specifying the android:onClick=" function attribute" (and then, write this function in MainActivity.java). Yes, that's just the problem, here's how to make sure that the condition is met: if the user clicks on three different checkboxes, then the fourth one should switch to disabled mode. According to my logic, here you need create static var count = 0, which will count the number of clicked checkboxes, that is, constantly "increment" by one unit, with each click.As soon as count becomes greater than 3, then somehow put the last checkbox remaining in the array into disabled mode by the function setEnabled(false) Yes but I have a problem like these event listeners that I bind to each individual checkbox put in if...else conditions? Or is my logic wrong in the root? Then how in general?
I tried do something like this:

if(CBA[0].isChecked()){
            CBA[0].setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
                @Override
                public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                    for(int i=0; i < CBA.length ; i++)
                        if(CBA[i].isChecked())
                        {
                            count++;
                        }
                    if(count > 3){
                        CBA[3].setEnabled(false);
                    }

                }
            });

And then do the same for other elements of the array (that is, for other checkboxes).
I don't know why but it doesn't work.
Maybe someone knows?