public int getValue()

{

return value;

}

public Card(String fname, int val)

{

value= val;

front = new GreenfootImage(fname+".gif");

setImage(back);

}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot, and MouseInfo)

/**
 * Write a description of class MemoryGame here.
 * 
 * Andy McCallum
 * 01/05/2020
 */
public class MemoryGame extends World
{
    Card[] cards = new Card[20];

    private static Card firstPicked;
    private static Card secondPicked;
    private int timer;
    public static int matchTries;
    public static int matchCount;

    private int match;
    public MemoryGame()
    {
        super(4, 5, 100);
        // load array
        // shuffle
        // deal
        for (int i=0; i<cards.length; i++) cards[i] = new Card(Greenfoot.getRandomNumber(10));
        java.util.Collections.shuffle(java.util.Arrays.asList(cards));
        for (int i=0; i<cards.length; i++) addObject(cards[i], i/5, i%5);

    }

    public void act()
    {
        if (timer > 0)
        {
            timer--;
            if (timer > 0) return;
            match();
        }
        mouseClicking();

    } 

    private void mouseClicking()
    {
        if(Greenfoot.mouseClicked(null))
        {
            Actor clickedOn = Greenfoot.getMouseInfo().getActor();

            if (clickedOn == null || ! (clickedOn instanceof Card)) return;
            Card c = (Card)clickedOn;
            if (c.isShowing()) return;

            if (firstPicked == null) 
            {
                firstPicked = c;
                c.flipCard();
            }
            else 
            {
                secondPicked = c;
                c.flipCard();
                timer = 20;
            }
        }

    }

    private void match()
    {

    }
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Card here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Card extends Actor 
{
    private static GreenfootImage back = new GreenfootImage("cover.gif");

    private GreenfootImage front;
    private boolean isShowing;
    private int value;

    public void flipCard()
    {
        isShowing = ! isShowing;
        setImage(isShowing ? front : back);
    }

    public int getValue()
    {
        return value;
    }

    public Card(int val)
    {
        value= val;
        front = new GreenfootImage("g"+ val +".gif");
        setImage(back);
    }

    public boolean isShowing()
    {
        return isShowing;
    }
}

if (firstPicked == null) 
        {
            firstPicked = this;
            flipCard();
        }
        else if (secondPicked == null) 
        {
            secondPicked = this;
            flipCard();
        {
           if (firstPicked !=match)