Starting GridBagLayout from top left corner in Java Swing

Question

I\'m new to Java Swing and I have been struggling to start the GridBagLayout from top left corner so that c.gridx=0 c.gridy=0 will put my object on the top left corner.

Answer 1

There's a workaround. You can put the GridBagLayout panel in a BorderLayout panel with BorderLayout.NORTH. Then Component in GridBagLayout panel will start from top position.

static void test4(){
    JFrame frame = new JFrame("Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(480, 360);

    JPanel borderLayoutPanel=new JPanel(new BorderLayout());
    JPanel gridBagLayoutPanel = new JPanel(new GridBagLayout());
    borderLayoutPanel.add(gridBagLayoutPanel, BorderLayout.NORTH);
    frame.add(borderLayoutPanel);

    JButton testButton=new JButton("test button");
    GridBagConstraints c = new GridBagConstraints();
    c.gridx=0;
    c.gridy=0;
    gridBagLayoutPanel.add(testButton, c);

    frame.setVisible(true);
}