I have a display problem with JTable in Java

Firstly I created a structure of JTable in the class of JPanel

 public void paint(Graphics g) {
        // TODO Auto-generated method stub
        this.setLayout(null);


        Object [][] data = {};

        String[] cols = {"Student ID", "Student Name", "D.O.B", "Contact info"};
        DefaultTableModel model = new DefaultTableModel(data, cols);
        JTable table = new JTable(model) {
             public boolean isCellEditable(int row, int column){
                    return false;
               }
        };
        JScrollPane scroll = new JScrollPane(table);
        scroll.setBounds(20, 50, 620, 200); 
        add(scroll);

and then I have updated a bunch of data into rows of JTable in a method of ActionListener when I add a button “Load” Load.addActionListener(listener);

ActionListener listener = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub

                if(e.getSource() == Load) {
                    JFileChooser f = new JFileChooser();
                    int result = f.showOpenDialog(null);

                    if(result == JFileChooser.APPROVE_OPTION) {

                        String Path= f.getSelectedFile().getAbsolutePath();

                        path.setText(Path);



                        Object[][] vector = new String[Dem_Dong(Path)][4]; 
                        String[] cols = {"Student ID", "Student Name", "D.O.B", "Contact info"};

                        for (int i = 0; i < Dem_Dong(Path); i++) {

                        String[] array = Doc_File(Path, i).split("#");
                        vector[i][0] = array[0];
                        vector[i][1] = array[1];
                        vector[i][2] = array[2];
                        vector[i][3] = array[3];
                        }
                        model.setDataVector(vector, cols);
                }
            }

My JTable show up but it has a uncomfortable problem like this enter image description here

I have tried a lot of way that I searched on Google but nobody can help me. If you know it please give me an anwser, I am a Freshman of college in Vietnam hope you understand my question. Thank you very much

Answer

public void paint(Graphics g) {
     // you are currently create your JTable and GUI components here
}

You’re doing all this GUI building code within a painting method and that is, to be blunt, madness. Put it into code that is called once and only once, such as the class constructor. A painting method should be for painting and painting only.

Suggestions:

Get that code out of paint and into the class constructor
You shouldn’t be overriding paint to begin with
If you need to do custom drawing (you don’t show yet that you do), this should be done within the paintComponent method of a class that extends JPanel, not the paint method

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Answer