Question

A JavaFX question

a method called generate2Num(Pane, pane){};

A botton "botton1" that botton.setOnAction(e-> {}); calling generate2Num method and show the numbers on Scene.

Every time the user clicks botton1, the updated number will show on the Scene.

I just wanna know how can I update my data by click the button.

Please show the code , thank you

Answer 1

Answer:-

************Main.java************

package application;
  
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Main extends Application {
   @Override
   public void start(Stage primaryStage) {
       try {
           BorderPane root = new BorderPane();
           Button button1 = new Button("updatenumber");
             
          
   // action event
   EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {
   public void handle(ActionEvent e)
   {
  
       generate2Num(root);
   }
   };
  
   // when button is pressed
   button1.setOnAction(event);
           root.setTop(button1);
           Scene scene = new Scene(root,400,400);
           scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
           primaryStage.setScene(scene);
           primaryStage.show();
       } catch(Exception e) {
           e.printStackTrace();
       }
   }
  
   int number=0;
public void generate2Num(Pane pane){
   number++;
   BorderPane borderp= (BorderPane) pane;
   borderp.setCenter(new Text(""+number));
  
}
  
   public static void main(String[] args) {
       launch(args);
   }
}
************Main.java Output************

Description:-in the above example "i clicked the updatenumber button 80 times" the updated number is "80"

whenever you click on the "updatenumber" button  the updated number will show on the Scene

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