Sample Controller.java with string property

SampleController.java

public class SampleController implements Initializable {
    
   // Define the property
    private StringProperty counter = new SimpleStringProperty();
 
    // Define a getter for the property's value
    public final String getCounter(){return counter.get();}
 
    // Define a setter for the property's value
    public final void setCounter(String value){counter.set(value);}
 
     // Define a getter for the property itself
    public StringProperty counterProperty() {return counter;}
    
    private int val=0;
    
    @FXML
    private void handleButtonAction(ActionEvent event) {
        System.out.println("You clicked me!");
        val=val+1;
        counter.setValue("Counter:" +val);
    }
}