How I can update a panel with the same panel?

Question

I would replace the same panel several times , but do not know how to do. I created a class " Grafico " which has a constructor that initializes with more parameters that I calculate in my code . For simplicity I will omit these parameters . "box " is a JComboBox that depending on the selected item is activated and creates these panels For example:

JPanel middle = new JPanel(new BorderLayout());
Grafico graph1 = new Grafico(.......);
JPanel conf1 = new JPanel();

middle.add(graph1, BorderLayout.CENTER);
middle.add(conf1, BorderLayou.EAST);
frame.getContentPane().add(middle);

box.addItemListener(new ItemListener() {

                    @Override
                    public void itemStateChanged(ItemEvent e) {

.........//I do something..I create a new object of type "Grafico" with new parameters........................

Grafico graph2 = new Grafico(.......);
middle.remove(graph1);

                            middle.add(graph2, BorderLayout.CENTER);

                            frame.getContentPane().add(middle);
                            frame.getContentPane().revalidate();
                            frame.getContentPane().repaint();


}
});

And this works , but the second time I click on an object in the JComboBox I wish it would update me graph2 every time, without creating a new one every click , but it does not!

So, assuming that graph2 exists, you should just update it. This means you will need to make graph2 a instance field and check to see if it's null or not — MadProgrammer, May 24 '16 at 21:33

score 2 · Answer 1 · edited May 23 '17 at 12:22

2

You have to call repaint() and revalidate() in order to refresh the Panel.

Java Swing revalidate() vs repaint()

edited May 23 '17 at 12:22

Community

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answered May 24 '16 at 21:48

Simone C.

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How I can update a panel with the same panel?

1 Answers1