title: Multiple, but limited, CheckBoxes in FXML/JavaFX
body: <p>I'm trying to find a way to use check boxes to allow the user to pick two things from a list of three, and then have the remaining check box become disabled until one of the others is un-selected. I have a ChangeListener attached to all three check boxes, so I can register when two have been selected, but I don't know how to target the "other" box/boxes to disable/enable them.</p>
  
  <pre><code>ChangeListener checkboxlistener = new ChangeListener() {
  int i = 0;
          @Override
          public void changed(ObservableValue observable, Object oldValue, Object newValue) {
  
  
              if((boolean) observable.getValue() == true) {
  
                  i++;
                  System.out.println(i);
              } else {
                  i--;
                  System.out.println(i);
              }
              if(i == 2) {
                  //What should I put here, if anything?//
              }
          }
  
  };
      checkbox1.selectedProperty().addListener(checkboxlistener);
      checkbox2.selectedProperty().addListener(checkboxlistener);
      checkbox3.selectedProperty().addListener(checkboxlistener);
  
  }
  </code></pre>