MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

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 MainClass {

    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 = 9; i > 0; i--) {
            JButton button = new JButton(Integer.toString(i));
            frame.add(button, 0);
        }

        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);
    }
}