A small prototype for a switch-lights problem (four or more consecutive lights will be turned off) By Henry Chen https://henry416.wordpress.com

	import javafx.application.Application;
	import javafx.event.EventHandler;
	import javafx.scene.Group;
	import javafx.scene.Scene;
	import javafx.scene.input.MouseEvent;
	import javafx.scene.paint.Color;
	import javafx.scene.shape.Circle;
	import javafx.stage.Stage;
	public class LightSwitch extends Application {
	int[] array = new int[25];
	Circle[] light = new Circle[25];
	@Override
	public void start(Stage stage) {
	init(stage);
	stage.show();
	}
	public void init(Stage stage) {
	Group root = new Group();
	Scene scene = new Scene(root, 700, 500, Color.WHITE);
	for (int i = 0; i < 25; i++) {
	circleChange(i, root);
	}
	root.getChildren().addAll(light);
	stage.setTitle("Lights Problem");
	stage.setScene(scene);
	}
	public void circleChange(final int i, final Group root) {
	light[i] = new Circle(i * 25 + 25, 100, 10);
	light[i].setOnMouseClicked(new EventHandler<MouseEvent>() {
	public void handle(MouseEvent me) {
	if (array[i] == 1)
	array[i] = 0;
	else
	array[i] = 1;
	int counter = 0;
	int place = -1;
	boolean x = false;
	for (int a = 0; a < 25; a++) {
	if (array[a] == 1) {
	if (x == false) {
	place = a;
	x = true;
	}
	counter++;
	} else {
	if (counter >= 4 && x == true)
	a = 26;
	else {
	x = false;
	counter = 0;
	place = -1;
	}
	}
	}
	if (counter >= 4 && x == true)
	for (int b = 0; b < counter; b++)
	array[b + place] = 0;
	paint();
	me.consume();
	}
	});
	}
	public void paint() {
	for (int a = 0; a < 25; a++) {
	if (array[a] == 0)
	light[a].setFill(Color.BLACK);
	else
	light[a].setFill(Color.RED);
	}
	}
	public static void main(String args[]) {
	Application.launch(args);
	}
	}

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