How to replace JPanel with another JPanel

Question

I want to replace a Jpanel with another one in a JFrame I already search and try my code but nothing\'s happen this is my code :

public class Frame extends          


        

Answer 1

you need to do like this :

     public void actionPerformed(ActionEvent e) {
        //System.out.println("in");
        contain = getContentPane();
        contain.removeAll();
        //System.out.println("in2");

        reChange2 = new JPanel(null);
        reChange2.setBackground(Color.white);
        reChange2.setSize(240, 225);
        reChange2.setBounds(50, 50, 240, 225);
        //System.out.println("in3");

        contain.add(reChange2);
        validate();
        repaint();
        //System.out.println("in4");
        setVisible(true);
        //System.out.println("in5");
    }
});