Fitness Tracker — JavaFX

A desktop fitness companion built with JavaFX and FXML: a BMI calculator plus a set of daily health reminders, across two scenes.

Coursework project, TH Aschaffenburg.

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Features

Screen	Contents
Main (hello-view.fxml)	Four health-tip buttons — step count, water intake, sleep, nutrition
BMI Calculator (new.fxml)	Mass and height inputs, calculated BMI, and a link back to the main page

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How it works

BMI calculation

private void calculateResult() {
    try {
        double number1 = Double.parseDouble(masstext.getText());
        double number2 = Double.parseDouble(heighttext.getText());
        double result = number1 / (number2 * number2);
        resultlabel.setText(result + "kg/m^2");
    } catch (NumberFormatException e) {
        resultlabel.setText("Invalid input! Please enter numbers.");
    }
}

Standard BMI: mass in kilograms divided by height in metres squared. Non-numeric input is caught rather than allowed to crash the handler.

Health tips

Four handlers set a label each — deliberately static advice rather than calculated values:

Handler	Output
onclick()	"your Stepcount for today is 1000"
waterclick()	"You should drink 2.5l of water today"
sleepclick()	"you should get at least 8 hours of sleep"
eatclick()	"Eat your vegetables"

Scene navigation

Both scenes share one controller. Switching reloads an FXML layout into the existing Stage:

Parent root = FXMLLoader.load(getClass().getResource("new.fxml"));
stage = (Stage)((Node) event.getSource()).getScene().getWindow();
stage.setScene(new Scene(root));

The cast chain walks from the clicked control up to its window — the usual way to reach the Stage from a controller that was never given one.

Module configuration

module com.example.projjjjj {
    requires javafx.controls;
    requires javafx.fxml;
    requires java.desktop;

    opens com.example.projjjjj to javafx.fxml;
    exports com.example.projjjjj;
}

opens ... to javafx.fxml is what allows FXML to inject the @FXML fields reflectively. Without it those fields arrive as null.

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Building and running

This project does not build from a clean clone — see Known issues. No Maven or Gradle configuration is committed.

With a pom.xml using the JavaFX plugin:

mvn javafx:run

Or compile against a local JavaFX SDK:

javac --module-path /path/to/javafx-sdk/lib \
      --add-modules javafx.controls,javafx.fxml \
      -d out $(find . -name "*.java")

java  --module-path /path/to/javafx-sdk/lib \
      --add-modules javafx.controls,javafx.fxml \
      -cp out com.example.projjjjj.HelloApplication

Requires Java 17+ and JavaFX 23.

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Known issues

1. No build file. Neither pom.xml nor build.gradle is committed, so the project cannot be compiled without reconstructing the build. The highest-value fix.

2. Division by zero is not handled. A height of 0 passes Double.parseDouble fine and yields Infinity, which is displayed as Infinitykg/m^2. NumberFormatException catches bad text, not bad numbers — the inputs need a range check.

3. The result is not rounded. result + "kg/m^2" prints the raw double, so a 70 kg / 1.75 m person sees 22.857142857142858kg/m^2. String.format("%.1f", result) would fix it. There is also no space before the unit.

4. The package is still the IDE default — com.example.projjjjj, which is also the directory name. Renaming touches module-info.java and the fx:controller attributes in both FXML files.

5. Field and handler names are inconsistent — masstext, walktext, sleeplabel, onclick. Java convention is camelCase (massText, onStepsClicked), and onclick says nothing about what it does.

6. javax.swing.* is imported into a JavaFX controller. Unused, but mixing the two UI toolkits is worth avoiding.

7. The health tips are hardcoded. Step count is a fixed string, not a real measurement, and water and sleep advice ignores the user's mass and height — which the BMI screen already collects. Deriving the water target from body mass would connect the two halves of the app.

Repository history note

This repository previously contained a byte-identical copy of the Dodge the Creeps Godot project — 44 files of an unrelated game, and not a single .java file despite the repository name. The actual JavaFX fitness tracker had never been pushed.

The Godot content has been removed (it remains intact in its own repository) and replaced with the real project.

Project structure

projjjjj/src/main/
├── java/
│   ├── module-info.java
│   └── com/example/projjjjj/
│       ├── HelloApplication.java   entry point
│       └── HelloController.java    BMI calculation + health tips
└── resources/com/example/projjjjj/
    ├── hello-view.fxml             main screen
    └── new.fxml                    BMI calculator

Author

Shehan Nimsara — B.Sc. Software Design (International), TH Aschaffenburg