Matching Pairs game - something's not right?

Hi, this is a matching pairs game i'm making. basically if the user manages to find a matching pair they score a hit if not they score a miss. What i'm finding though, is that when i click on the cards (JToggleButtons), they wont change, only once i press the 'solve' button do they change on the click of a mouse. I can't figure it out for the life of me? Please could someone show me where im going wrong.. thanks!

Code :

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import javax.swing.*;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ItemListener;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.*;
 
 
 
 
public class MatchingPairs {
 
 
	// Create images for toggle buttons
	private ImageIcon backImg = new ImageIcon("back.jpg");
    private ImageIcon heartImg = new ImageIcon("heart.jpg");
    private ImageIcon diamondImg = new ImageIcon("diamond.jpg");
    private ImageIcon spadeImg = new ImageIcon("spade.jpg");
    private ImageIcon clubImg = new ImageIcon("club.jpg");
 
	//Create JToggleButtons
    private JToggleButton heart = new JToggleButton(backImg);
    private JToggleButton heartDup = new JToggleButton(backImg);
    private JToggleButton diamond = new JToggleButton(backImg);
    private JToggleButton diamondDup = new JToggleButton(backImg);
    private JToggleButton spade = new JToggleButton(backImg);
    private JToggleButton spadeDup = new JToggleButton(backImg);
    private JToggleButton club = new JToggleButton(backImg);
    private JToggleButton clubDup = new JToggleButton(backImg); 
 
    //Create JButtons
    private JButton scramble = new JButton("Scramble");
    private JButton solve = new JButton("Solve");
 
    //Create JTextFields
    private JTextField hitValue = new JTextField(3);
    private JTextField missValue = new JTextField(3);
 
    //Create JLabels
    private JLabel hitLabel = new JLabel("Hits");
    private JLabel missLabel = new JLabel("Miss");
 
    // Variables
    private int hit;
    private int miss;
 
    //Window for GUI
    private JFrame window = new JFrame("Matching Pairs");
    private JPanel cardTable = new JPanel();
 
 
    // MatchingPairs() - constructor
    public MatchingPairs(){
    	// configure GUI
      	window.add(cardTable);
    	window.setSize(1400, 800);
    	window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    	window.setBackground(Color.GREEN);
    	window.add(cardTable);
    	cardTable.setBackground(Color.GREEN);
 
 
 
       	hitValue.setEditable(false);
        hitValue.setFont(new Font("Arial",Font.BOLD,30));
        hitValue.setText(String.valueOf(hit));
 
 
    	missValue.setEditable(false);
        missValue.setFont(new Font("Arial",Font.BOLD,30));
        missValue.setText(String.valueOf(miss));
 
    	// add event listeners
        solve.addActionListener(new SolveButton());
        scramble.addActionListener(new ScrambleButton());
        heart.addItemListener(new Cards());
        heartDup.addItemListener(new Cards());
        diamond.addItemListener(new Cards());
        diamondDup.addItemListener(new Cards());
        spade.addItemListener(new Cards());
        spadeDup.addItemListener(new Cards());
        club.addItemListener(new Cards());
        clubDup.addItemListener(new Cards()); 
 
 
 
 
        cardTable.setLayout(new GridLayout(3, 6, 10, 10));
        cardTable.add(hitValue);
        hitValue.setPreferredSize(new Dimension(180, 300));
        cardTable.add(missValue);
        cardTable.add(scramble);
        cardTable.add(solve);
        cardTable.add(heart);
        cardTable.add(heartDup);
        cardTable.add(diamond);
        cardTable.add(diamondDup);
        cardTable.add(spade);
        cardTable.add(spadeDup);
        cardTable.add(club);
        cardTable.add(clubDup);
 
 
        //display GUI
        window.setVisible(true);
 
 
    }  
 
 
 
     // handle solve button press
    class SolveButton implements ActionListener{
    	public SolveButton(){
       	}
    	    public void actionPerformed(ActionEvent e){     // Switch ImageIcon to card faces
    	    	heart.setSelectedIcon(heartImg);
    	    	heartDup.setSelectedIcon(heartImg);
    	    	diamond.setSelectedIcon(diamondImg);
    	    	diamondDup.setSelectedIcon(diamondImg);
    	    	spade.setSelectedIcon(spadeImg);
    	    	spadeDup.setSelectedIcon(spadeImg);
    	    	club.setSelectedIcon(clubImg);
    	    	clubDup.setSelectedIcon(clubImg);
    	    }
    }
 
    // handle scramble button press (Does nothing at the moment)
    class ScrambleButton implements ActionListener {
    	public ScrambleButton(){
       	}
    }
 
 
    class Cards implements ItemListener{     // Flip card on click
        public Cards(){
       	}
            public void itemStateChange(ItemEvent e){
            	if (e.getStateChange() == ItemEvent.SELECTED){
            		heart.setSelectedIcon(heartImg);
            		heartDup.setSelectedIcon(heartImg);
            		diamond.setSelectedIcon(diamondImg);
        	    	diamondDup.setSelectedIcon(diamondImg);
        	    	spade.setSelectedIcon(spadeImg);
        	    	spadeDup.setSelectedIcon(spadeImg);
        	    	club.setSelectedIcon(clubImg);
        	    	clubDup.setSelectedIcon(clubImg);            		
            	}
           }
    }
 
    public static void main(String[] args) {
		MatchingPairs gui = new MatchingPairs();
 
	}
 
}

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Your code does not compile.