Notes on Installing Java and JavaFX

---
Title: Notes on Installing Java and JavaFX
Date: 2022-12-28
Sequence: 1
Tags: []
---

Some notes on setting up Java for my course.

Installing Java

First step is to get the JDK, the Java Development Kit.

⇒ https://jdk.java.net/19/

Get the zip file and extract it to C:\bin\.

Now we need to add java to the environment so that windows knows about it.

This is a system variable.

JAVA_HOME =  C:\bin\jdk-19.0.1

You will also need to add the bin directory to the **PATH** so java can be used from the commandline.

 C:\bin\jdk-19.0.1\bin

Open the command prompt and simply type in `java`. This should result in the java help being printed.

Now we have Java ready to go.

Installing JavaFX

Next up, javafx, the GUI library.

⇒ https://gluonhq.com/products/javafx/

Download the SDK, the software development kit as a zip. Extract the zip to C:\bin as well.

Eclipse - The Editor

Download Eclipse as a zip package and we will do the same thing as before, extract it to C:\bin.

⇒ https://www.eclipse.org/downloads/packages/

We should now have the following structure in C:\bin:

C:\bin\jdk-19.0.1
C:\bin\javafx-sdk-19
C:\bin\eclipse

Hello World in Java

The first step is to make sure java is installed properly before we get to JavaFX.

To do this, make a hello-world project and quickly get something on the screen.

package helloworld;
class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!"); 
    }
}

Hello World with JavaFX

The first step to getting JavaFX working with eclipse is to follow the below instructions:

⇒ https://openjfx.io/openjfx-docs/#install-javafx

A hello world example

⇒ https://docs.oracle.com/javafx/2/get_started/hello_world.htm

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.StackPane;
import javafx.stage.Stage;
 
public class HelloWorld extends Application {
    public static void main(String[] args) {
        launch(args);
    }
    
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {
 
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello World!");
            }
        });
        
        StackPane root = new StackPane();
        root.getChildren().add(btn);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }
}