How to use

paintComponent

method

in

javax.swing.JPasswordField

@Override
protected void paintComponent(Graphics g) {
  if (!active) {
    return;
  }
  super.paintComponent(g);
}

@Override
protected void paintComponent(final Graphics pG) {
  super.paintComponent(pG);
  if (placeholder == null || placeholder.length() == 0 || getText().length() > 0) {
    return;
  }
  final Graphics2D g = (Graphics2D) pG;
  g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  g.setColor(Color.lightGray);
  g.drawString(placeholder, getInsets().left, pG.getFontMetrics().getMaxAscent() + getInsets().top);
}

@Override
protected void paintComponent(final Graphics pG) {
  super.paintComponent(pG);
  if (placeholder.length() == 0 || getText().length() > 0) {
    return;
  }
  final Graphics2D g = (Graphics2D) pG;
  g.setRenderingHint(
    RenderingHints.KEY_ANTIALIASING,
    RenderingHints.VALUE_ANTIALIAS_ON);
  g.setColor(getDisabledTextColor());
  g.drawString(placeholder, getInsets().left, pG.getFontMetrics()
    .getMaxAscent() + getInsets().top);
}

  @Override
  public void paintComponent(Graphics g) {
    Component window = this.getTopLevelAncestor();
    if (window instanceof Window && !((Window) window).isOpaque()) {
      // This is a translucent window, so we need to draw to a buffer
      // first to work around a bug in the DirectDraw rendering in Swing.
      int w = this.getWidth();
      int h = this.getHeight();
      if (buffer == null || buffer.getWidth() != w || buffer.getHeight() != h) {
        // Create a new buffer based on the current size.
        GraphicsConfiguration gc = this.getGraphicsConfiguration();
        buffer = gc.createCompatibleImage(w, h, BufferedImage.TRANSLUCENT);
      }

      // Use the super class's paintComponent implementation to draw to
      // the buffer, then write that buffer to the original Graphics object.
      Graphics bufferGraphics = buffer.createGraphics();
      try {
        super.paintComponent(bufferGraphics);
      } finally {
        bufferGraphics.dispose();
      }
      g.drawImage(buffer, 0, 0, w, h, 0, 0, w, h, null);
    } else {
      // This is not a translucent window, so we can call the super class
      // implementation directly.
      super.paintComponent(g);
    }
  }
}

@Override
protected void paintComponent(Graphics g) {
  Graphics2D g2 = (Graphics2D) g;
  g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
  g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
  g2.setColor(getBackground());
  g2.fillRect(0, 0, getWidth(), getHeight());
  g2.translate(0, 9);
  super.paintComponent(g);
  g2.translate(0, -9);
  if (!getHint().isEmpty() && getPassword().length == 0 && (getLabel().isEmpty() || isFocusOwner()) && floatingLabel.isFloatingAbove()) {
    g.setFont(Roboto.REGULAR.deriveFont(16f));
    g2.setColor(Utils.applyAlphaMask(getForeground(), HINT_OPACITY_MASK));
    FontMetrics metrics = g.getFontMetrics(g.getFont());
    g.drawString(getHint(), 0, metrics.getAscent() + 36);
  }
  floatingLabel.paint(g2);
  g2.setColor(Utils.applyAlphaMask(getForeground(), LINE_OPACITY_MASK));
  g2.fillRect(0, getHeight() - 9, getWidth(), 1);
  g2.setColor(accentColor);
  g2.fillRect((int) ((getWidth() - line.getWidth()) / 2), getHeight() - 10, (int) line.getWidth(), 2);
}