Jabaco Source

Import java#awt#Toolkit
Import java#awt#Graphics2D

Public Sub Form_Load()
   Dim myToolkit As Toolkit
   myToolkit = Toolkit.getDefaultToolkit

   ' get the smallest valid cursor size
   Dim myDim As Dimension
   myDim = myToolkit.getBestCursorSize(1, 1)

   ' create a new image of that size with an alpha channel
   Dim cursorImg As BufferedImage
   cursorImg = New BufferedImage (myDim.width,myDim.height, BufferedImage.TYPE_INT_ARGB)
   
   ' get a Graphics2D object to draw to the image
   Dim g2d As Graphics2D
   g2d = cursorImg.createGraphics()
   
   ' set the background 'color' with 0 alpha and clear the image
   g2d.setBackground(New Color(0.0, 0.0, 0.0, 0.0))
   g2d.clearRect(0,0,myDim.width,myDim.height)
   
   ' dispose the Graphics2D object
   g2d.dispose()
   
   ' now create your cursor using that transparent image
   Dim hiddenCursor As Cursor
   hiddenCursor = myToolkit.createCustomCursor(cursorImg, New Point(0,0), "hiddenCursor")
   
   ' use the hidden Cursor
   Parent.setCursor( hiddenCursor )
End Sub

Jabaco Source

import javax.swing.*;
import java.awt.*;
import java.awt.image.*;


public class BlackScreen extends JFrame {

  public BlackScreen() {
    Toolkit toolkit = Toolkit.getDefaultToolkit();

    // get the smallest valid cursor size
    Dimension dim = toolkit.getBestCursorSize(1, 1);

    // create a new image of that size with an alpha channel
    BufferedImage cursorImg = new BufferedImage(dim.width, dim.height, BufferedImage.TYPE_INT_ARGB);

    // get a Graphics2D object to draw to the image
    Graphics2D g2d = cursorImg.createGraphics();

    // set the background 'color' with 0 alpha and clear the image
    g2d.setBackground(new Color(0.0f, 0.0f, 0.0f, 0.0f));
    g2d.clearRect(0, 0, dim.width, dim.height);

    // dispose the Graphics2D object
    g2d.dispose();

    // now create your cursor using that transparent image
    Cursor hiddenCursor = toolkit.createCustomCursor(cursorImg, new Point(0,0), "hiddenCursor");

    // use the hidden Cursor
    this.setCursor( hiddenCursor );



    // sets background color to back
    this.setBackground(Color.black);

    // shows only the part in the window, not the frame around it
    this.setUndecorated(true);

    // sets the size to full screen
    GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().setFullScreenWindow(this);
  }

  public void paint(Graphics g){}

  public static void main(String[] args) {
    BlackScreen window = new BlackScreen();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setVisible(true);
  }

}