Could someone explain this to me.

Question

I have a panel that I add transparent textpanes with shapes drawn over the top, the shapes and textpanes originat from a class named round button.
I add the shapes in a loop:
for( int i = 0; i < answer.length; i++ ){
       if( answer[i] != null ){
          String answerText = answer;
buttonPanel.add(new RoundButton(answerText, buttonColor,
buttonShape, size, myMouseListener));
I've noticed that the first time I add 2 textpanes and shapes I get six calls to the drawSquareButton method. WHY?
I can not figure it out. Although I only get 2 squares on the screen, the flicker of the process is driving me nuts.
Below is class RoundButton
public class RoundButton extends JTextPane {
private Color color;
public String buttonShape;
private String label;
private Dimension size;
private java.awt.event.MouseListener myMouseListener;
public RoundButton(String label, Color color, String buttonShape,
                    Dimension size, java.awt.event.MouseListener myMouseListener) {
       super();
       setOpaque (false);
       setEditorKit (new MyEditorKit());
       SimpleAttributeSet set =  new SimpleAttributeSet();
       StyleConstants.setAlignment (set, StyleConstants.ALIGN_CENTER ); 
       setParagraphAttributes (set, true);
       setText(label);
       addMouseListener(myMouseListener);
       this.color = color;
       setPreferredSize(size);
       this.buttonShape = buttonShape;
// set the rendering hints for the Graphics object 
  private Graphics2D setGraphicsObject(Graphics g){
        Graphics2D g2 = (Graphics2D)g; 
        g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING,
                     RenderingHints.VALUE_ANTIALIAS_ON );
        g2.setRenderingHint( RenderingHints.KEY_RENDERING,
                     RenderingHints.VALUE_RENDER_QUALITY );    
        g2.setRenderingHint( RenderingHints.KEY_COLOR_RENDERING,
                     RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        return g2;
// Determine which shape to draw
  protected void paintComponent(Graphics g) {
     System.out.println("paint component");
        if( buttonShape.equals("square"))
            drawSquareButton(g, color);
        else if(buttonShape.equals ("oval"))
            drawOvalButton(g, color);
        else if(buttonShape.equals ("circle"))
            drawRoundButton(g, color);
        super.paintComponent(g);
  public void drawSquareButton(Graphics g, Color color){
        System.out.println("draw square button");
        Graphics2D g2 = setGraphicsObject(g);
        g2.setStroke(new BasicStroke(1.2f));
        g2.setColor(color);
        g2.fill(new RoundRectangle2D.Double(1,1,(getWidth()-3),(getHeight()-3),30,30));
        g2.setColor(color.darker ());
        g2.setStroke(new BasicStroke(2.2f));
        g2.draw(new RoundRectangle2D.Double(1,1,(getWidth()-3),(getHeight()-3),30,30));
  public void drawOvalButton(Graphics g, Color color){
        Graphics2D g2 = setGraphicsObject(g);
        g2.setStroke(new BasicStroke(1.2f));
        g2.setColor(color);
        g2.fillOval(0, 0, getSize().width-1, getSize().height-1);
        g2.setStroke (new BasicStroke(2.2f));
        g2.setColor(color.darker());
        g2.drawOval(0, 0, getSize().width-1, getSize().height-1);
  public void drawRoundButton(Graphics g, Color color){
        Graphics2D g2 = setGraphicsObject(g);
        g2.setStroke(new BasicStroke(1.2f));
        g2.setColor(color);
        g2.fillArc(0,0,getSize().width-1,getSize().height-1,0,360);
        g2.setStroke (new BasicStroke(2.2f));
        g2.setColor(color.darker());
        g2.drawArc(0,0,getSize().width-1, getSize().height-1, 0, 360);

Answer 1

Do you really want the super.paintComponent() after you've drawn your components?
Perhaps an else?
// Determine which shape to draw
  protected void paintComponent(Graphics g) {
     System.out.println("paint component");
        if( buttonShape.equals("square"))
            drawSquareButton(g, color);
        else if(buttonShape.equals ("oval"))
            drawOvalButton(g, color);
        else if(buttonShape.equals ("circle"))
            drawRoundButton(g, color);
        else
            super.paintComponent(g);
}