如何使GridBagLayout组件彼此相邻出现？

Question

当前试图熟悉GridBagLayout。 我试图将某些组件彼此相邻放置。但是，我有一个跨多个单元格的JTable组件，我想彼此相邻的组件应该在JTable组件上方。

我不确定如何告诉Java / GBL将所有其他组件彼此相邻放置。

我了解了有关网格宽度（GridBagConstraints.RELATIVE）的信息，但是它不起作用。

有帮助吗？

谢谢。

尝试的网格宽度= GBC.RELATIVE

公共类PMFrame扩展了DatabaseConnection {

// CONSTRUCTOR
public PMFrame() {

    //JFrame
    JFrame frame = new JFrame("GridBagLayout");
    JPanel panel = new JPanel();
    panel.setLayout(new GridBagLayout());
    panel.setBackground(Color.LIGHT_GRAY);
    GridBagConstraints c = new GridBagConstraints();

    //JTable
    String[] columnNames = {"ID","Anwendung","Password"};
    String [][] data = {{"Katy","Facebook","epyo0wj5"},{"Nico","Instagram","djdjdjj"}};
    JTable t = new JTable(data,columnNames);
    JScrollPane sp = new JScrollPane(t);    

    //Labels
    JLabel labelInsert = new JLabel("Inserting");
    JLabel labelUpdate = new JLabel("Updating");
    JLabel labelDelete = new JLabel("Deleting");
    JLabel labelSearch = new JLabel("Searching");
    JLabel labelJTable = new JLabel("Passwort-Tabelle:");

    //Buttons
    JButton buttonInsert = new JButton("Insert");       
    JButton buttonUpdate = new JButton("Update");       
    JButton buttonDelete = new JButton("Delete");       
    JButton buttonSearch = new JButton("Search");       
    JButton buttonPopulate = new JButton("Populate");       
    JButton buttonClose = new JButton("CLOSE");     

    //Textfields Anwendung
    JTextField textfieldAnwendung1 = new JTextField(7);
    JTextField textfieldAnwendung2 = new JTextField(7);
    JTextField textfieldAnwendung3 = new JTextField(7);
    JTextField textfieldAnwendung4 = new JTextField(7);

    //Textfields Password
    JTextField textfieldPassword1 = new JTextField(7);
    JTextField textfieldPassword2 = new JTextField(7);
    JTextField textfieldPassword3 = new JTextField(7);
    JTextField textfieldPassword4 = new JTextField(7);


    //Row 0
    c.anchor = GridBagConstraints.LINE_START;
    c.gridx = 0;
    c.gridy = 0;
    panel.add(labelInsert,c);

    c.gridx = 1;
    c.gridy = 0;
    panel.add(labelUpdate,c);

    c.gridx = 2;
    c.gridy = 0;
    panel.add(labelDelete,c);

    c.gridx = 3;
    c.gridy = 0;
    panel.add(labelSearch,c);

    //Row 1
    c.gridx = 0;
    c.gridy = 1;
    panel.add(textfieldAnwendung1,c);

    c.gridx = 1;
    c.gridy = 1;
    panel.add(textfieldAnwendung2,c);

    c.gridx = 2;
    c.gridy = 1;
    panel.add(textfieldAnwendung3,c);

    c.gridx = 3;
    c.gridy = 1;
    panel.add(textfieldAnwendung4,c);

    //Row 2
    c.gridx = 0;
    c.gridy = 2;
    panel.add(textfieldPassword1,c);

    c.gridx = 1;
    c.gridy = 2;
    panel.add(textfieldPassword2,c);

    c.gridx = 2;
    c.gridy = 2;
    panel.add(textfieldPassword3,c);

    c.gridx = 3;
    c.gridy = 2;
    panel.add(textfieldPassword4,c);

    c.gridx = 0;
    c.gridy = 5;
    panel.add(sp,c);


    // FRAME ACTIVATION
    frame.add(panel);
    frame.setLocation(600, 350);
    frame.pack();
    frame.setSize(500, 500);
    frame.setVisible(true);