Code
JTextField textField02 = new JTextField(20) {
@Override protected void paintComponent(Graphics g) {
if (!isOpaque() && getBorder() instanceof RoundedCornerBorder) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setPaint(getBackground());
g2.fill(((RoundedCornerBorder) getBorder()).getBorderShape(
0, 0, getWidth() - 1, getHeight() - 1));
g2.dispose();
}
super.paintComponent(g);
}
@Override public void updateUI() {
super.updateUI();
setOpaque(false);
setBorder(new RoundedCornerBorder());
}
};
class RoundedCornerBorder extends AbstractBorder {
private static final Color ALPHA_ZERO = new Color(0x0, true);
@Override public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Shape border = getBorderShape(x, y, width - 1, height - 1);
g2.setPaint(ALPHA_ZERO);
Area corner = new Area(new Rectangle2D.Double(x, y, width, height));
corner.subtract(new Area(border));
g2.fill(corner);
g2.setPaint(Color.GRAY);
g2.draw(border);
g2.dispose();
}
public Shape getBorderShape(int x, int y, int w, int h) {
int r = h; //h / 2;
return new RoundRectangle2D.Double(x, y, w, h, r, r);
}
@Override public Insets getBorderInsets(Component c) {
return new Insets(4, 8, 4, 8);
}
@Override public Insets getBorderInsets(Component c, Insets insets) {
insets.set(4, 8, 4, 8);
return insets;
}
}
References
