Game xếp số đơn giản 2x2

import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class XepSo22 extends JFrame implements ActionListener {
    private GridBagLayout gb;
    private GridBagConstraints gbc;
    private JButton[][] btMang;
    private String strTG;
    private int move = 0;

    public static void main(String[] args) {
        XepSo22 fr = new XepSo22("Xep So 22");
        fr.setSize(300, 200);
        fr.setVisible(true);
    }

    public XepSo22(String title) {
        super(title);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent we) {
                System.exit(0);
            }
        });
        gb = new GridBagLayout();
        this.setLayout(gb);
        btMang = new JButton[2][2];
        btMang[0][0] = new JButton();
        btMang[0][1] = new JButton();
        btMang[1][0] = new JButton();
        btMang[1][1] = new JButton();

        GanGiaTri();

        Them(btMang[0][0], 0, 0, 1, 1);
        Them(btMang[0][1], 1, 0, 1, 1);
        Them(btMang[1][0], 0, 1, 1, 1);
        Them(btMang[1][1], 1, 1, 1, 1);
        btMang[0][0].addActionListener(this);
        btMang[0][1].addActionListener(this);
        btMang[1][0].addActionListener(this);
        btMang[1][1].addActionListener(this);
        if (Win() == true) {
            JOptionPane.showMessageDialog(null, "Win roi ma");
            System.exit(0);
        }
    }

    public void GanGiaTri() {
        Random random = new Random();
        int[] mang = new int[4];
        int r1 = 0, r2 = 0, rtg;
        for (int i = 0; i < 4; i++) {
            mang[i] = i;
        }
        for (int i = 0; i < 9; i++) {
            random = new Random();
            r1 = random.nextInt(4);
            r2 = random.nextInt(4);
            if (r1 != r2) {
                rtg = mang[r1];
                mang[r1] = mang[r2];
                mang[r2] = rtg;
            }
        }
        btMang[0][0].setText(String.valueOf(mang[0]));
        btMang[0][1].setText(String.valueOf(mang[1]));
        btMang[1][0].setText(String.valueOf(mang[2]));
        btMang[1][1].setText(String.valueOf(mang[3]));
    }

    public void Them(Component comp, int x, int y, int w, int h) {
        gbc = new GridBagConstraints();
        gbc.gridx = x;
        gbc.gridy = y;
        gbc.gridwidth = w;
        gbc.gridheight = h;
        gb.setConstraints(comp, gbc);
        this.add(comp);
    }

    public void Doi(JButton btGiua1, JButton btGiua2) {
        strTG = btGiua1.getText();
        btGiua1.setText(btGiua2.getText());
        btGiua2.setText(strTG);
    }

    public boolean Win() {
        Boolean check = true;
        if (!btMang[0][0].getText().equals("0")
                || !btMang[0][1].getText().equals("1")
                || !btMang[1][0].getText().equals("2")
                || !btMang[1][1].getText().equals("3")) {
            check = false;
        }
        return check;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        int vti = 0, vtj = 0;
        for (int i = 0; i < 2; i++) {
            for (int j = 0; j < 2; j++) {
                if (btMang[i][j].getText().equals("0")) {
                    vti = i;
                    vtj = j;
                }
            }
        }

        if (vti > 0) {
            if (e.getSource() == btMang[vti - 1][vtj]) {
                Doi(btMang[vti - 1][vtj], btMang[vti][vtj]);
            }
        }

        if (vti < 1) {
            if (e.getSource() == btMang[vti + 1][vtj]) {
                Doi(btMang[vti + 1][vtj], btMang[vti][vtj]);
            }
        }

        if (vtj > 0) {
            if (e.getSource() == btMang[vti][vtj - 1]) {
                Doi(btMang[vti][vtj - 1], btMang[vti][vtj]);
            }
        }

        if (vtj < 1) {
            if (e.getSource() == btMang[vti][vtj + 1]) {
                Doi(btMang[vti][vtj + 1], btMang[vti][vtj]);
            }
        }

        if (Win() == true) {
            JOptionPane.showMessageDialog(null, "Win roi ma");
            System.exit(0);
        }
        if (++move == 10) {
            JOptionPane.showMessageDialog(null, "Thua roi nhe");
            System.exit(0);
        }
    }
}