http://hiroyukitsuda.com/archives/1721 http://www.creativeapplications.net/processing/craft-your-processing-sketches-in-eclipse/

myFirst_p5_in_eclipse.java

import processing.core.*;

public class MainApp extends PApplet {

	int x, y;

	public void settings() {
		size(500, 500, FX2D);
	}

	public void setup() {
		colorMode(HSB, 360, 100, 100, 100);
		noStroke();
		background(0, 0, 50);
	}

	public void mouseMoved() {
		x = mouseX;
		y = mouseY;
	}

	public void draw() {
		ellipse(x, y, 50, 50);
	}

	public static void main(String[] args) {
		PApplet.main("MainApp");
	}
}