Examples of java.awt.Graphics.dispose()

java.awt.Graphics.dispose()
Disposes of this graphics context and releases any system resources that it is using. A Graphics object cannot be used after disposehas been called.
When a Java program runs, a large number of Graphics objects can be created within a short time frame. Although the finalization process of the garbage collector also disposes of the same system resources, it is preferable to manually free the associated resources by calling this method rather than to rely on a finalization process which may not run to completion for a long period of time.
Graphics objects which are provided as arguments to the paint and update methods of components are automatically released by the system when those methods return. For efficiency, programmers should call dispose when finished using a Graphics object only if it was created directly from a component or another Graphics object. @see java.awt.Graphics#finalize @see java.awt.Component#paint @see java.awt.Component#update @see java.awt.Component#getGraphics @see java.awt.Graphics#create

        Graphics g = bi.createGraphics();
        doScaleRotate(img, ifd, g, dim);
        Graphics2D g2d = (Graphics2D)g;
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, Main.m_settings.getInterpolation());
        g.drawImage(img, 0, 0, null);
        g.dispose();
        return bi;
    }
}


final class JImageData

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    public static BufferedImage loadCompatibleImage(URL resource) throws IOException {
        BufferedImage image = ImageIO.read(resource);
        BufferedImage compatibleImage = createCompatibleImage(image.getWidth(), image.getHeight());
        Graphics g = compatibleImage.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();
        image = null;
        return compatibleImage;
    }


    public static BufferedImage createThumbnail(BufferedImage image, int requestedThumbSize) {

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    isSaving = true;
    setDrawText(false);
    paint(g);
    setDrawText(true);
    isSaving = false;
    g.dispose();


    BufferedImage subImage = image.getSubimage((int) xPositionToPixel(0.0),
        (int) yPositionToPixel(1.0),
        (int) (xPositionToPixel(1.0) - xPositionToPixel(0.0)) + 1,
        (int) (yPositionToPixel(0.0) - yPositionToPixel(1.0)) + 1);

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  {
    validateComponent(c);
    BufferedImage image = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics g = image.createGraphics();
    c.paint(g);
    g.dispose();
    return image;
  }
  private static void validateComponent(Component c)
  {
    if (!c.isValid())

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                getGraphicsConfiguration().createCompatibleImage(
                    image.getWidth(), image.getHeight(),
                    image.getTransparency());
        Graphics g = compatibleImage.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();


        return compatibleImage;
    }


    /**

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        image = new ImageIcon(image).getImage();


        BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
        Graphics g = bufferedImage.createGraphics();
        g.drawImage(image, 0, 0, Color.WHITE, null);
        g.dispose();


  try {
    ImageIO.write((RenderedImage) bufferedImage, "PNG", file);
        } catch (IllegalArgumentException ex) {
      }

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    image = new ImageIcon(image).getImage();


    BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
    Graphics g = bufferedImage.createGraphics();
    g.drawImage(image, 0, 0, Color.WHITE, null);
    g.dispose();


    // make it reappear
    plotToolBar.setVisible(true);


    try {

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    BufferedImage selection=img.getSubimage(offsetX,offsetY,width,height);
    Image scaledSelection=selection.getScaledInstance(cols,rows,BufferedImage.SCALE_FAST);
    BufferedImage scaledBufferedImage = new BufferedImage(cols, rows, BufferedImage.TYPE_INT_ARGB);
    Graphics g=scaledBufferedImage.createGraphics();
    g.drawImage(scaledSelection,0,0,null);
    g.dispose();
    return scaledBufferedImage;
  }
  
  private BufferedImage toMono(BufferedImage img){
    if (img==null) return finalImage;

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    // Now, render the transparent image into the original in Graphics object
    g.drawImage(transparentImage,
                x, y, x+width, y+height, 0, 1, width, height + 1, this);


    // Clean up
    offscreenG.dispose();
    transparentImage.flush();
    buffer.flush();
  }


  @Override

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    {
      Graphics g = _getInitializedGraphics(context, buffer);
      size = super.getPreferredSize(new ProxyContext(context, g));


      // Clean up
      g.dispose();
      buffer.flush();
    }
    else
    {
      // If we didn't get a buffer, just paint the contents directly

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