[Solved] How to draw 10000 circles in Random locations using JavaFX?

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After fixing the runtime error you are getting, your code only draws one circle. That’s because you only add one circle to your scene graph. The for loop basically does nothing. The last X and Y coordinates for the circle’s center are used to draw the single, solitary circle. You need to add ten thousand circles.

In the code below, I changed 10_000 to 100 (one hundred) since 10_000 has too many overlapping circles in the stage dimensions that you set. I also increased each circle’s radius.

import java.util.Random;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;

public class RandomCircles extends Application {
    private Random randomNumbers = new Random();
    private int count;
    private final double MAX_X = 600;
    private final double MAX_Y = 300;
    private final int FINAL_CIRCLES = 100;

    public void start(Stage primaryStage){
        Group baseDemo = new Group();
        for(count = 0; count <= FINAL_CIRCLES; count++){
            Circle initCircle = new Circle();
            initCircle.setStroke(Color.BLACK);
            initCircle.setStrokeWidth(3);
            initCircle.setRadius(5);
            initCircle.setCenterX(randomNumbers.nextInt((int) MAX_X));
            initCircle.setCenterY(randomNumbers.nextInt((int) MAX_Y));
            baseDemo.getChildren().add(initCircle);
        }

        Scene scene = new Scene(baseDemo);
        scene.setFill(Color.WHITE);
        scene.getWidth();

        primaryStage.setTitle("100");
        primaryStage.setScene(scene);
        primaryStage.setResizable(true);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

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solved How to draw 10000 circles in Random locations using JavaFX?