Java swing draw centered text

public void centerString(Graphics g, Rectangle r, String s, 
        Font font) {
    FontRenderContext frc = 
            new FontRenderContext(null, true, true);

    Rectangle2D r2D = font.getStringBounds(s, frc);
    int rWidth = (int) Math.round(r2D.getWidth());
    int rHeight = (int) Math.round(r2D.getHeight());
    int rX = (int) Math.round(r2D.getX());
    int rY = (int) Math.round(r2D.getY());

    int a = (r.width / 2) - (rWidth / 2) - rX;
    int b = (r.height / 2) - (rHeight / 2) - rY;

    g.setFont(font);
    g.drawString(s, r.x + a, r.y + b);
}

Source: stackoverflow.com

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