Here is a code of snake game in java swing.

1)SnakeGame.java:

import javax.swing.JFrame;

public class SnakeGame extends JFrame {

public SnakeGame() {

add(new Snake());

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(320, 340);
setLocationRelativeTo(null);
setTitle("Snake");

setResizable(false);
setVisible(true);
}

public static void main(String[] args) {
new SnakeGame();
}
}

2)Snake.java:

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

public class Snake extends JPanel implements ActionListener {
private final int WIDTH = 300;
private final int HEIGHT = 300;
private final int DOT_SIZE = 10;
private final int ALL_DOTS = 900;
private final int RAND_POS = 29;
private final int DELAY = 140;
private int x[] = new int[ALL_DOTS];
private int y[] = new int[ALL_DOTS];
private int dots;
private int apple_x;
private int apple_y;
private boolean left = false;
private boolean right = true;
private boolean up = false;
private boolean down = false;
private boolean inGame = true;
private Timer timer;
private Image ball;
private Image apple;
private Image head;
public Snake() {
addKeyListener(new TAdapter());
setBackground(Color.black);
ImageIcon iid = new ImageIcon(this.getClass().getResource("image3.gif"));
ball = iid.getImage();
ImageIcon iia = new ImageIcon(this.getClass().getResource("image2.png"));
apple = iia.getImage();
ImageIcon iih = new ImageIcon(this.getClass().getResource("image1.gif"));
head = iih.getImage();
setFocusable(true);
initGame();
}
public void initGame() {
dots = 3;
for (int z = 0; z < dots; z++) {
x[z] = 50 - z*10;
y[z] = 50;
}
locateStar();
timer = new Timer(DELAY, this);
timer.start();
}

continue....

public void paint(Graphics g) {
super.paint(g);
if (inGame) {
g.drawImage(apple, apple_x, apple_y, this);
for (int z = 0; z < dots; z++) {
if (z == 0)
g.drawImage(head, x[z], y[z], this);
else g.drawImage(ball, x[z], y[z], this);
}
Toolkit.getDefaultToolkit().sync();
g.dispose();
} else {
gameOver(g);
}
}
public void gameOver(Graphics g) {
String msg = "Game Over";
Font small = new Font("Helvetica", Font.BOLD, 14);
FontMetrics metr = this.getFontMetrics(small);
g.setColor(Color.white);
g.setFont(small);
g.drawString(msg, (WIDTH - metr.stringWidth(msg)) / 2,
HEIGHT / 2);
}
public void checkApple() {
if ((x[0] == apple_x) && (y[0] == apple_y)) {
dots++;
locateStar();
}
}
public void move() {
for (int z = dots; z > 0; z--) {
x[z] = x[(z - 1)];
y[z] = y[(z - 1)];
}
if (left) {
x[0] -= DOT_SIZE;
}
if (right) {
x[0] += DOT_SIZE;
}
if (up) {
y[0] -= DOT_SIZE;
}
if (down) {
y[0] += DOT_SIZE;
}
}
public void checkCollision() {
for (int z = dots; z > 0; z--) {
if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) {
inGame = false;
}
}
if (y[0] > HEIGHT) {
inGame = false;
}
if (y[0] < 0) {
inGame = false;
}
if (x[0] > WIDTH) {
inGame = false;
}
if (x[0] < 0) {
inGame = false;
}
}
public void locateStar() {
int r = (int) (Math.random() * RAND_POS);
apple_x = ((r * DOT_SIZE));
r = (int) (Math.random() * RAND_POS);
apple_y = ((r * DOT_SIZE));
}
public void actionPerformed(ActionEvent e) {
if (inGame) {
checkApple();
checkCollision();
move();
}
repaint();
}
private class TAdapter extends KeyAdapter {
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode();
if ((key == KeyEvent.VK_LEFT) && (!right)) {
left = true;
up = false;
down = false;
}
if ((key == KeyEvent.VK_RIGHT) && (!left)) {
right = true;
up = false;
down = false;
}
if ((key == KeyEvent.VK_UP) && (!down)) {
up = true;
right = false;
left = false;
}
if ((key == KeyEvent.VK_DOWN) && (!up)) {
down = true;
right = false;
left = false;
}
}
}
}

Here is a code of TicTacToe game. We usually say cross and zero to it.

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

public class TicTacToe implements ActionListener {
private int[][] winCombinations = new int[][] {
{0, 1, 2}, {3, 4, 5}, {6, 7, 8},
{0, 3, 6}, {1, 4, 7}, {2, 5, 8},
{0, 4, 8}, {2, 4, 6}};
private JFrame window = new JFrame("Tic-Tac-Toe");
private JButton buttons[] = new JButton[9];
private int count, xWins, oWins = 0;
private String letter = "";
private boolean win = false;
public TicTacToe(){
window.setSize(300,300);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new GridLayout(3,3));
window.setLocationRelativeTo(null);
for(int i=0; i<=8; i++){
buttons[i] = new JButton();
window.add(buttons[i]);
buttons[i].addActionListener(this);
}
window.setVisible(true);
}
public void actionPerformed(ActionEvent a) {
count++;
if(count % 2 == 0){
letter = "O";
} else {
letter = "X";
}
JButton pressedButton = (JButton)a.getSource();
pressedButton.setText(letter);
pressedButton.setEnabled(false);
for(int i=0; i<=7; i++){
if( buttons[winCombinations[i][0]].getText().equals(buttons[winCombinations[i][1]].getText()) &&
buttons[winCombinations[i][1]].getText().equals(buttons[winCombinations[i][2]].getText()) &&
buttons[winCombinations[i][0]].getText() != ""){
win = true;
}
}
if(win == true){
if (count % 2 == 0){
JOptionPane.showMessageDialog(null, "Player O WINS the game!");
saveName();
playAgainDialog();
}else
JOptionPane.showMessageDialog(null, "Player X WINS the game!");
saveName();
playAgainDialog();
} else if(count == 9 && win == false){
JOptionPane.showMessageDialog(null, "The game was tie!");
playAgainDialog();
}
}
public void playAgainDialog() {
if(letter.equals("X")) xWins++;
else oWins++;
int response = JOptionPane.showConfirmDialog(null, "Do you want to play again?","Confirm", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
if(response == JOptionPane.YES_OPTION) reset();
else window.hide();
}
public void reset() {
for (int i=0; i<=8; i++){
buttons[i].setText("");
buttons[i].setEnabled(true);
}
win = false;
count = 0;
}
public void saveName(){
int response = JOptionPane.showConfirmDialog(null, "Do you want to save your name?","Confirm", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
if(response == JOptionPane.YES_OPTION){
String name= JOptionPane.showInputDialog(null,"Enter Name (Player X or Player O)");
try{
File file = new File("TicTacToe.txt");
FileWriter fstream = new FileWriter(file,true);
BufferedWriter out = new BufferedWriter(fstream);
out.write(name);
out.newLine();
out.close();
}
catch(Exception e){}
}
}
public static void main(String[] args){
new TicTacToe();
}
}