java - JavaFX increasing a circle's radius by clicking on it -

i'm trying create javafx program creates circle when click on screen. there can many circles @ once. can't think of solution how increase circle's radius when click on again.

public class controller implements initializable {      @fxml     private button reset;      @fxml     private anchorpane anchor;      @fxml     private borderpane border;      circle circle = new circle();     int radius = 20;      public void initialize (url location, resourcebundle resources) {         anchor.setonmouseclicked(event -> {             border.getchildren().add(circle = new circle());             circle.setcenterx(event.getx());             circle.setcentery(event.gety());             circle.setradius(radius);              });          reset.setonaction(event -> {             border.getchildren().clear();         });          circle.setonmouseclicked(event -> {             circle.setradius(radius * 1.5);         });     } } 

the field declare circle never added scene graph. never appears , mouseclicked handler never invoked.

on other hand, circles add scene graph have no mouse clicked handler associated them. need register handler when create them:

anchor.setonmouseclicked(event -> {     circle circle = new circle();     border.getchildren().add(circle);     circle.setcenterx(event.getx());     circle.setcentery(event.gety());     circle.setradius(radius);     circle.setonmouseclicked(e -> {         circle.setradius(circle.getradius() * 1.5);         // prevent event propagating pane:         e.consume();     }); }); 

and rid of circle instance field , handler associate entirely.