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Java

Hello rectangle!​

HelloRectangle.java
import io.github.bernhardfritz.p8g.Sketch;

public class HelloRectangle extends Sketch {
    @Override
    public void draw() {
        background(220);
        rect(50, 50, 100, 100);
    }

    public static void main(String[] args) {
        Sketch sketch = new HelloRectangle();
        sketch.run(320, 320, "Hello rectangle!");
    }
}
ScreenshotScreenshot

Build and run with an IDE​

IntelliJ IDEA​

IntelliJ project settings

macOS users should start their application passing -XstartOnFirstThread as a VM option.

IntelliJ run configuration

Tested on IntelliJ IDEA Community 2021.3.3.

Eclipse​

Eclipse project settings

macOS users should start their application passing -XstartOnFirstThread as a VM option.

Eclipse run configuration

Tested on Eclipse 4.23.

Build and run from the command line​

.
├── HelloRectangle.java
└── p8g.jar
javac -cp p8g.jar HelloRectangle.java
java -cp .;p8g.jar HelloRectangle

Tested on Windows 10 with OpenJDK installed from https://adoptium.net/.