How to clear a JPanel?

Question

Java

JPanel panel=new JPanel();
panel.setLayout(new FlowLayout());
panel.add(new JButton("1"));
panel.add(new JButton("2"));

We created the panel, set the layout, added 2 buttons. Is there a command to quickly clear the entire panel, if so, will the layout rules be removed?

Answer 1

JPanal.removeAll();

Answer 2

Try calling the removeAllItems() method first, and then repaint() and revalidate(). As far as I remember, this is how it worked for me (exactly these three methods, and in that order).