Overriding javax.swing.JButton and drawing the text

I am overriding the javax.swing.JButton paintComponent() I would like to know how to center the text on the button
here is part of the code, the text is printed near the end:
       ((java.awt.Graphics2D)grph2d).setRenderingHint(
                   java.awt.RenderingHints.KEY_ANTIALIASING,
                   java.awt.RenderingHints.VALUE_ANTIALIAS_ON);
       grph2d.setColor(new java.awt.Color(0.0f,1.0f,0.0f,1f));
       grph2d.fillRect(0,0,getWidth(),getHeight());
       if(!this.model.isRollover()){
              grph2d.setColor(new java.awt.Color(0,125,0));
              grph2d.fillRect(0,0,getWidth(),getHeight());
       if(model.isPressed()){
            grph2d.setColor(new java.awt.Color(1f,0f,0f,1f));
            grph2d.fillOval(0,0,getWidth(),getHeight());
       if(model.isArmed()){
            grph2d.setColor(new java.awt.Color(0f,0f,1f,1f));
            grph2d.fillOval(0,0,getWidth(),getHeight());
       grph2d.setColor(new java.awt.Color(0.0f,0.0f,0.0f));
// text draws but isn't centered very well
       grph2d.drawString(this.getText(),
            this.getMargin().left + getX(),
            this.getMargin().top + getY());is there any way to auto center the text, or calculate the length of the text in pixels.

       grph2d.drawString(this.getText(),
            getWidth()/2 - (grph2d.getFontMetrics().stringWidth(getText())/2),
            grph2d.getFontMetrics().getHeight());thanks! works much better now.

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