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

      sRand += tmp;
      // 将系统随机字符添加到图形验证码图片上
      g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
      g.drawString(tmp, FONT_SIZE * i + 5, FONT_SIZE + 5);
    }
    g.dispose();
    try {
      ImageIO.write(image, "JPEG", out);
      out.close();
    } catch (IOException e) {
      sRand = null;

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            if (pg != null) {
                pg.translate(LEFT, HEIGHT);
                pg.drawRect(0, 0, pageSize.width - LEFT - 1, pageSize.height - HEIGHT - 1);
                view.print(new PrintCanvas(pg, view));
                pg.dispose();
            }


            job.end();
        }
        frame.dispose();

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                    final String line = tk.nextToken();
                    graphic.drawString(line, x, y);
                    y += graphic.getFontMetrics().getHeight();
                }


                graphic.dispose();
            }


            job.end();
        }
        parent.dispose();

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      // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
      g.drawString(rand, 13 * i + 6, 16);
    }


    // 图象生效
    g.dispose();
    
    return sRand;
  }
  
  /*

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      clipg.setColor(Color.white);
      Graphics2D g2d = (Graphics2D) clipg;
      g2d.setColor(Color.white);
      g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
      clipg.drawString(title, 0, gy);
      clipg.dispose();
    }


    int w = CONTROL_CLOSE.getWidth(c);
    gx = x + width - OUTER_PAD - w - 2;
    gy = y + OUTER_PAD + 2;

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    Graphics2D g2d = (Graphics2D) clipg;
    g2d.setStroke(STROKE);
    g2d.setColor(GREEN_COLOR);
    JPopupMenuDesignOperation operation = (JPopupMenuDesignOperation) adaptable.getAdapter(IDesignOperation.class);
    g2d.drawLine(0, operation.getInsert_y(), jpm.getWidth(), operation.getInsert_y());
    clipg.dispose();
  }


  protected static Color GREEN_COLOR = new Color(164, 255, 0);
  protected static Stroke STROKE;

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                }
                BufferedImage packedImage = new BufferedImage(image.getWidth(), image.getHeight(),
                        BufferedImage.TYPE_BYTE_BINARY);
                Graphics graphics = packedImage.getGraphics();
                graphics.drawImage(image, 0, 0, null);
                graphics.dispose();
                image = packedImage;
            }


            DataBuffer dBuf = image.getData().getDataBuffer();
            if (dBuf.getDataType() == DataBuffer.TYPE_BYTE)

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        // avoid multiple of 8 to test padding
        assertFalse(bitonalImage.getWidth() % 8 == 0);
        
        g = bitonalImage.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();
        PDImageXObject ximage3 = LosslessFactory.createFromImage(document, bitonalImage);
        validate(ximage3, 1, bitonalImage.getWidth(), bitonalImage.getHeight(), "png", PDDeviceGray.INSTANCE.getName());
        checkIdent(bitonalImage, ximage3.getImage());


        // This part isn't really needed because this test doesn't break

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        int w = image.getWidth();
        int h = image.getHeight();
        BufferedImage argbImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
        Graphics ag = argbImage.getGraphics();
        ag.drawImage(image, 0, 0, null);
        ag.dispose();


        for (int x = 0; x < argbImage.getWidth(); ++x)
        {
            for (int y = 0; y < argbImage.getHeight(); ++y)
            {

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        int w = image.getWidth();
        int h = image.getHeight();
        BufferedImage argbImage = new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR);
        Graphics ag = argbImage.getGraphics();
        ag.drawImage(image, 0, 0, null);
        ag.dispose();


        for (int x = 0; x < argbImage.getWidth(); ++x)
        {
            for (int y = 0; y < argbImage.getHeight(); ++y)
            {

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