java - Elements not showing in GridBagLayout

Question

I am using GridBagLayout as JFrame layout. My elements are not showing no matter what i write. Please don't give answers which use anything but GridBagLayout(sorry if it sound rude)

JPanel Panel;
    JButton insertButton = new JButton("Insert");
    GridBagConstraints gbc;

    public MainFrame() {

        this.setTitle("JAVA & MySQL");
        this.setVisible(true);
        this.setBounds(500, 100, 600, 600);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);

        Panel = new JPanel(new GridBagLayout());
        Panel.setOpaque(true);
        Panel.setBackground(Color.BLUE);
        gbc = new GridBagConstraints();

        gbc.weightx = 1;
        gbc.weighty = 1;
        gbc.anchor = GridBagConstraints.CENTER;
        gbc.gridx = 1;
        gbc.gridy = 1;
        gbc.insets = new Insets(0, 10, 0, 0);
        gbc.fill = GridBagConstraints.BOTH;

        Panel.add(insertButton, gbc);




    }

Answer 1

Your code is not clear whats where (is this code inside your frame class) and you have chosen names poorly. By convention field names should start witha lower case letter (to distinguish them from class names).

It appears you never add your panel to the frame, and also you never pack() the frame.

Alter the code like this:

public MainFrame() {
    this.setTitle("JAVA & MySQL");
    // setting visible should come last!
    //this.setVisible(true);
    this.setBounds(500, 100, 600, 600);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);

    Panel = new JPanel(new GridBagLayout());
    Panel.setOpaque(true);
    Panel.setBackground(Color.BLUE);
    gbc = new GridBagConstraints();

    gbc.weightx = 1;
    gbc.weighty = 1;
    gbc.anchor = GridBagConstraints.CENTER;
    gbc.gridx = 1;
    gbc.gridy = 1;
    gbc.insets = new Insets(0, 10, 0, 0);
    gbc.fill = GridBagConstraints.BOTH;

    Panel.add(insertButton, gbc);

    // put the panel into the frame!
    setLayout(new BorderLayout());
    add(Panel, BorderLayout.CENTER);
    pack();
    setVisible(true);
}