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import java.awt.Component;
import java.awt.Container;
import java.awt.FocusTraversalPolicy;
import java.awt.GridLayout;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SortingFocusTraversalPolicy;
public class NextComponentSample {
public static void main(String args[]) {
JFrame frame = new JFrame("Reverse Sample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridLayout(3, 3));
for (int i = 0; i < 9; i++) {
JButton button = new JButton(Integer.toString(i));
frame.add(button);
}
final Container contentPane = frame.getContentPane();
Comparator<Component> comp = new Comparator<Component>() {
public int compare(Component c1, Component c2) {
Component comps[] = contentPane.getComponents();
List list = Arrays.asList(comps);
int first = list.indexOf(c1);
int second = list.indexOf(c2);
return second - first;
}
};
FocusTraversalPolicy policy = new SortingFocusTraversalPolicy(comp);
frame.setFocusTraversalPolicy(policy);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
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