JFrame frame = new JFrame();
JButton component1 = new JButton("1");
JButton component2 = new JButton("2");
JButton component3 = new JButton("3");
// By default, the focus traversal order is the same as the insertion order
frame.getContentPane().setLayout(new FlowLayout());
frame.getContentPane().add(component1);
frame.getContentPane().add(component2);
frame.getContentPane().add(component3);
// Change the order from 1,2,3 to 1,3,2
component1.setNextFocusableComponent(component3);
component3.setNextFocusableComponent(component2);
component2.setNextFocusableComponent(component1);
// Restore the order to 1,2,3
component1.setNextFocusableComponent(null);
component2.setNextFocusableComponent(null);
component3.setNextFocusableComponent(null);