BoxLayout

Sometimes you want components to be lined up in a strictly vertical (or strictly horizontal) order. This can be done with a BoxLayout layout manager. Here is a constructor for it:

BoxLayout(Container contain, int axis) 

    contain: the container this layout manager is for
            
    axis: BoxLayout.X_AXIS  — for left to right alignment
          BoxLayout.Y_AXIS  — for top to bottom alignment

Notice that the constructor needs a reference to the container that it is manageing. To set the layout manager of a JPanel to BoxLayout with vertical alignment, do this:

JPanel panel = new JPanel();

panel.setLayout( new BoxLayout( panel, BoxLayout.Y_AXIS) );

Here is another example GUI. Look at it and decide where a vertical layout has been used