java如何使用JTable和GridBagLayout创建面板？

Question

是否有机会在一个地方创建一个带有Jtable和GridBagLayout的面板

我想要一个带有过滤按钮的JTable和GridBagLayout，但是当我添加表和GridBagLayout中的按钮时，这些按钮会显示在表后面

这是我的代码：

public class FormConnected extends JPanel {



private JTextField tfId = new JTextField(10);
private JTextField tfName = new JTextField(10);
private JTextField tfSurname = new JTextField(10);
private JTextField tfYear = new JTextField(10);
private JTextField tfAge = new JTextField(10);
private JTextField tfSchoolName = new JTextField(10);
private JTextField tfCity = new JTextField(10);
private JTextField tfDeanName = new JTextField(10);
private JTextField tfYearOfBuild = new JTextField(10);
private JLabel lFrom = new JLabel("From");
private JLabel lTo = new JLabel("To");
private JCheckBox jcbStudentName = new JCheckBox("Student name");
private JCheckBox jcbStudentSurname = new JCheckBox("Student surname");
private JCheckBox jcbSchoolCity = new JCheckBox("School city");
private JCheckBox jcbSchoolName = new JCheckBox("School name");
private JCheckBox jcbStudentAge = new JCheckBox("Student age");
private JList jlStudentName = new JList();
private JList jlStudentSurname = new JList();
private JList jlSchoolName = new JList();
private JList jlSchoolCity = new JList();
private JButton bFiltrate = new JButton("Filtrate");
private JButton bReset = new JButton("Reset");
private JComboBox jcbFrom = new JComboBox();
private JComboBox jcbTo = new JComboBox();

JPanel panelUp;
JPanel panelMedium;
JPanel panelDown;

private ArrayList<Connected> list;
private int idx;

public ArrayList<Connected> getLista() {
    return list;
}

public void setLista(ArrayList<Connected> list) {
    this.list = list;
}

public int getIdx() {
    return idx;
}

public void setIdx(int idx) {
    this.idx = idx;
}
public FormConnected()
{
    super(new GridBagLayout());
    //add(new JScrollPane(new JTable(new MyCustomTableModel(Database.selectInnerJoin()))));
    JPanel panelUp = new JPanel(new GridBagLayout());
    GridBagConstraints gbcPanelUp = new GridBagConstraints();

    JPanel panelMedium = new JPanel(new GridBagLayout());
    GridBagConstraints gbcPanelMedium = new GridBagConstraints();

    JPanel panelDown = new JPanel(new GridBagLayout());
    GridBagConstraints gbcPanelDown = new GridBagConstraints();



    gbcPanelUp.gridx = 0;
    gbcPanelUp.gridy = 0;
    gbcPanelUp.ipadx = 5;
    gbcPanelUp.ipady = 5;
    gbcPanelUp.insets = new Insets(5, 5, 5, 5);
    panelUp.add(jcbStudentName, gbcPanelUp);

    gbcPanelUp.gridx = 1;
    gbcPanelUp.gridy = 0;
    panelUp.add(jcbStudentSurname, gbcPanelUp);

    gbcPanelUp.gridx = 2;
    gbcPanelUp.gridy = 0;
    panelUp.add(jcbSchoolCity, gbcPanelUp);

    gbcPanelUp.gridx = 3;
    gbcPanelUp.gridy = 0;
    panelUp.add(jcbSchoolName, gbcPanelUp);

    gbcPanelUp.gridx = 0;
    gbcPanelUp.gridy = 1;
    panelUp.add(jlStudentName, gbcPanelUp);

    gbcPanelUp.gridx = 1;
    gbcPanelUp.gridy = 1;
    panelUp.add(jlStudentSurname, gbcPanelUp);

    gbcPanelUp.gridx = 2;
    gbcPanelUp.gridy = 1;
    panelUp.add(jlSchoolCity, gbcPanelUp);

    gbcPanelUp.gridx = 3;
    gbcPanelUp.gridy = 1;
    panelUp.add(jlSchoolName, gbcPanelUp);


    gbcPanelUp.gridx = 0;
    gbcPanelUp.gridy = 2;
    panelUp.add(jcbStudentAge, gbcPanelUp);

    gbcPanelUp.gridx = 0;
    gbcPanelUp.gridy = 3;
    panelUp.add(lFrom, gbcPanelUp);

    gbcPanelUp.gridx = 1;
    gbcPanelUp.gridy = 3;
    panelUp.add(jcbFrom, gbcPanelUp);

    gbcPanelUp.gridx = 2;
    gbcPanelUp.gridy = 3;
    panelUp.add(lTo, gbcPanelUp);

    gbcPanelUp.gridx = 3;
    gbcPanelUp.gridy = 3;
    panelUp.add(jcbTo, gbcPanelUp);


    gbcPanelDown.gridx = 0;
    gbcPanelDown.gridy = 0;
    gbcPanelDown.ipadx = 10;
    gbcPanelDown.ipady = 10;
    gbcPanelDown.insets = new Insets(50, 50, 5, 50);
    panelDown.add(bFiltrate, gbcPanelDown);

    gbcPanelDown.gridx = 1;
    gbcPanelDown.gridy = 0;
    gbcPanelDown.insets = new Insets(50, 50, 5, 50);
    panelDown.add(bReset, gbcPanelDown);


    GridBagConstraints gbcMain = new GridBagConstraints();
    gbcMain.gridx = 0;
    gbcMain.gridy = 0;
    add(panelUp, gbcMain);

    gbcMain.gridx = 0;
    gbcMain.gridy = 1;
    add(panelDown, gbcMain);

    list = Database.selectInnerJoin();
    if (list != null)
    {
        idx = 0;
        fillFormConnected();
    }
}
public void fillFormConnected()
{
    if(list.isEmpty() == false)
    {
        tfId.setText(list.get(idx).getId()+ "");
        tfName.setText(list.get(idx).getName()+ "");
        tfSurname.setText(list.get(idx).getSurname()+ "");
        tfYear.setText(list.get(idx).getYear()+"");
        tfAge.setText(list.get(idx).getAge()+"");
        tfSchoolName.setText(list.get(idx).getSchoolName()+"");
        tfCity.setText(list.get(idx).getCity()+"");
        tfDeanName.setText(list.get(idx).getDeanName()+"");
        tfYearOfBuild.setText(list.get(idx).getYearOfBuild()+"");
    }
}

}