Re: When will finalize() be invoked?

"John B. Matthews" <>
Mon, 22 Dec 2008 07:16:44 -0500
In article <gin216$85c$>,
 Mark Space <> wrote:

Nguyen Minh Hai wrote:

Then what is the purpose of introducing finalize() in Java?

Read Joshua Cramer's reply:

" Pretty much the only time you should be defining a finalize() method
is if you need to free memory associated with the object via native code. "

A common example is disposing of a graphics context that was created
directly, perhaps during offscreen drawing. The Graphics class
overrides finalize() to (eventually) free system resources by calling
dispose(); the latter may be invoked directly instead of waiting for
finalize() to be called:


For example:

    private static final int SIZE = 128;
    private static final Font FONT = new
        Font("Serif", Font.BOLD, SIZE * 7 / 8);
    private static final BufferedImage errorImage = new
        BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB); {
        Graphics2D g2d = errorImage.createGraphics();
        String s = "\u2298";
        int w2 = g2d.getFontMetrics().stringWidth(s) / 2;
        int h2 = g2d.getFontMetrics().getDescent();
        g2d.drawString(s, SIZE / 2 - w2 , SIZE / 2 + h2);

John B. Matthews
trashgod at gmail dot com

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