import java.awt.Component;
import java.awt.Container;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.JCheckBox;
import javax.swing.JFrame;


public class Difficulty extends JFrame {

/**
 *
 */
private static JCheckBox easy;
private static JCheckBox hard;
private static Container pane;
private Handeler handeler;
private static final long serialVersionUID = 1L;

public Difficulty() {
    super("Select a Difficulty");
    pane = new Container();
    getContentPane().add(pane);
    pane.add(Easy());
    pane.add(Hard());
}

public Component Hard() {
    handeler = new Handeler();
    hard = new JCheckBox("Hard");
    hard.setBounds(60, 40, 60, 50);
    hard.setVisible(true);
    hard.addItemListener(handeler);
    return hard;
}

private Component Easy() {
    handeler = new Handeler();
    easy = new JCheckBox("Easy");
    easy.setBounds(60, 0, 60, 50);
    easy.setVisible(true);
    easy.addItemListener(handeler);
    return easy;
}

public static void main(String[] args) {
    Difficulty gui = new Difficulty();
    gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    gui.setLocationRelativeTo(null);
    gui.setSize(200, 200);
    gui.setVisible(true);
    gui.setResizable(false);

}

private class Handeler implements ItemListener {

    @Override
    public void itemStateChanged(ItemEvent item) {

        if(item.getSource() == easy){
            for(int x = 0; x < 1; x++){
                if(hard.isSelected()){
                    hard.setSelected(false);
                    easy.setSelected(true);
                }else {easy.setSelected(true);}
            }

            }else if(item.getSource() == hard){
                for(int x = 0; x < 1; x++){
                if(easy.isSelected()){
                    easy.setSelected(false);
                    hard.setSelected(true);
                }else{hard.setSelected(true);}
                }
            }
        }
}