Пример с карти - апликация със запазване в локален файл състоянието на картите

Свалете в локалната директория на проекта файловете
http://ff.tu-sofia.bg/JavaBg/Images/images/C0.jpg
http://ff.tu-sofia.bg/JavaBg/Images/images/C1.jpg
http://ff.tu-sofia.bg/JavaBg/Images/images/C2.jpg
http://ff.tu-sofia.bg/JavaBg/Images/images/C3.jpg
http://ff.tu-sofia.bg/JavaBg/Images/images/C4.jpg
http://ff.tu-sofia.bg/JavaBg/Images/images/Cback.jpg

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class CardEx extends JFrame{
    Integer cnt =0;
    Image Card[] = new Image[5];
    int wh=70,ht=100;
    int vX[]=new int[Card.length];
    int vY[]=new int[Card.length];
    boolean back[] = new boolean[Card.length];
    boolean ctch[] = new boolean[Card.length];
    int helpX,helpY,clicks;
    Panel p= new Panel();
    Button s=new Button("save"), l=new Button("load");
    TextField tf = new TextField("moves: "+ cnt);
    Ce ce= new Ce();
    CardEx(int x, int y, int ln, int ht){
        setLayout(new BorderLayout());
        setBounds(x, y, ln, ht);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        p.add(s);
        p.add(l);
        s.addActionListener(new Save());
        l.addActionListener(new Load());
        ce.setBackground(Color.green);
        add("Center",ce);
        add("South",p);
        for(int i=0; i<Card.length;i++){
            Card[i]=Toolkit.getDefaultToolkit().getImage("C"+i+".jpg");
            vX[i]=20+55*i;
            vY[i]=30;
            back[i]=ctch[i]=false;
        }
        ce.addMouseListener(new MouseHandler());
        ce.addMouseMotionListener(new MouseMotionHandler());
        validate();
    }
    public  static void main(String arg[]){
        new CardEx(50,50,500,500);
    }
    class Ce extends Canvas{
        public void paint(Graphics g){
            for(int i=0;i<Card.length;i++){
                g.drawImage(Card[i], vX[i], vY[i], wh,ht,this);
                g.drawRect(vX[i], vY[i], wh,ht);
            }
        }
    }
    class MouseHandler extends MouseAdapter {
        public void mousePressed(MouseEvent e){
            helpX=e.getX(); helpY=e.getY();
            for(int i=0;i<Card.length;i++){
                if(chckIn(i,helpX,helpY)){
                    ctch[i]=true;
                    if(e.getClickCount()==2){
                        if(back[i])
                            Card[i]=Toolkit.getDefaultToolkit().getImage("C"+i+".jpg");
                        else Card[i]=Toolkit.getDefaultToolkit().getImage("Cback.jpg");
                        back[i]=!back[i];
                        ce.repaint(vX[i],vY[i],wh,ht);
                    }
                }
            }
            clicks=e.getClickCount();
            ce.repaint();
        }
        public void mouseReleased(MouseEvent e){
            for(int i=0;i<Card.length;i++){
                if(ctch[i]) tf.setText(": "+ ++cnt);
                ctch[i]=false;
            }
            ce.repaint();
        }
    }
    class MouseMotionHandler extends MouseMotionAdapter {
        public void mouseDragged(MouseEvent e){
            int x = e.getX();
            int y = e.getY();
            for(int i=0;i<Card.length;i++)
                if(ctch[i]) {
                    vX[i]+=(x-helpX); vY[i]+=(y-helpY);
                    ce.repaint(vX[i],vY[i],wh,ht); helpX=x; helpY=y;
                }
        }
    }
    boolean chckIn(int ncard, int x, int y){
        if( (x>vX[ncard])&& (x< vX[ncard]+wh) &&
                (y> vY[ncard])&& (y< vY[ncard]+ht) ) return true;
        return false;
    }
    class Save implements ActionListener  {
        public void actionPerformed(ActionEvent e ){
            ObjectOutputStream oos = null;
            try{
                oos = new ObjectOutputStream (
                        new FileOutputStream ("save.ser"));
                oos.writeObject(vX);
                oos.writeObject(vY);
                oos.writeObject(back);
            }
            catch (IOException ex){
                System.out.println(ex);
            }
            try{
                if(oos!=null)oos.close();
            }
            catch (IOException ex){}
        }
    }
    class Load implements ActionListener  {
        public void actionPerformed(ActionEvent e ){
            ObjectInputStream ios = null;
            try{
                ios = new ObjectInputStream (new FileInputStream ("save.ser"));
                vX=(int[])ios.readObject();
                vY=(int[])ios.readObject();
                back=(boolean[])ios.readObject();
                for(int i=0;i<Card.length;i++)
                    if(back[i])
                        Card[i]=Toolkit.getDefaultToolkit().getImage("Cback.jpg");
                    else
                        Card[i]=Toolkit.getDefaultToolkit().getImage("C"+i+".jpg");
                ce.repaint();
            }
            catch (Exception ex){ }
            try{
                if(ios!=null)ios.close();
            }
            catch (IOException ex){}
        }          
    }      
}