Question

How can I position a JButton under a JTable? What kind of layouts? How? I have a JTable table what is scrollable, and the table is in a frame.

Answer 1

There are many layouts to fulfill this need.

The simplest is using BorderLayout:

JFrame frame = new JFrame();
Container contentPane = frame.getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(new JScrollPane(jtable), BorderLayout.CENTER);
contentPane.add(button, BorderLayout.SOUTH);

If you want this button to be not resized just add JPanel to contentPane. This JPanel should contain your button centered using almost any layout.

If you would like to use more sophisticated layout – the best in my opinion is MigLayout