Alternate two messages on mouse click using Java-FX

Question

Write a program to display the text Welcome to Java and LearningJavaFX alternately with a mouse click.

package com.example.demo;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class MouseEventDemo extends Application {
    boolean displayFirstText = false;

    @Override
    public void start(Stage primaryStage) {
        Pane pane = new Pane();
        Text text1 = new Text(20, 20, "Learning JavaFX");
        Text text2 = new Text(30, 30, "Welcome to Java");
        pane.addEventHandler(MouseEvent.MOUSE_CLICKED, e -> {

            if (!displayFirstText) {
                pane.getChildren().clear();
                pane.getChildren().add(text2);
                displayFirstText = true;
            } else {
                pane.getChildren().clear();
                pane.getChildren().add(text1);
                displayFirstText = false;
            }
        });
        Scene scene = new Scene(pane, 300, 100);
        primaryStage.setTitle("MouseEventDemo");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

I am concerned with that if/else statement part. It seems like it could be made more readable. I'd love a cleaner way to toggle the variable, and I appreciate further improvements as well.

Conor O'Brien · Accepted Answer · 2025-08-08 20:50:03Z

In addition to coderodde's suggestion, you can apply DRY by moving the repeated pane.getChildren().clear() before the if statement (as it happens regardless of the condition tested):

pane.getChildren().clear();
if (!displayFirstText) {
    pane.getChildren().add(text2);
    // ...
} else {
    pane.getChildren().add(text1);
    // ...
}

You could also simplify the if statement by using the conditional operator ?::

pane.getChildren().clear();
pane.getChildren().add(displayFirstText ? text1 : text2);

coderodde · Accepted Answer · 2025-08-08 16:05:01Z

5

You could simply do:

b = !b;

for a boolean b.

answered Aug 8 at 16:05

coderodde

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