Read Basic Version:
http://terminalcoders.blogspot.in/2014/08/tic-tac-toe-find-empty-cell-to-play.html
I hope you have read the basic version. Now I would like to share the code of little bit advanced version of Tic Tac Toe with more characterized CPU player. In this code the CPU player can find the step to win and CPU player can predict the movement of opponent.
Characteristics of CPU player
- Play at center if center cell is empty.
- If center cell is empty play at corners because corners are suitable place to play rationally.
- If the CPU player can find out is it can win in next step.
- If the CPU player can't win in next step and the opponent can win in next step, the CPU player will play there to close the opportunity to win.
- If all conditions fail play at first empty cell.
It is possible to reduce the code by using mathematical functions. But the steps of code will be tough to grab from source code.
/*
*
*
* Coded By AJITH KP
* Artificial Intelligent Tic Tac Toe CPU Player
*
*
*/
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class TicTacToe extends JFrame {
JPanel l = new JPanel(new GridLayout(1, 1, 0, 0));
JPanel b = new JPanel(new GridLayout(3, 3, 5, 5));
JLabel lbl = new JLabel("Coded By Ajith Kp");
JTextField flds[] = new JTextField[9];
boolean pl = false;
TextHandle hld = new TextHandle();
TicTacToe()
{
super("TicTacToe --- AJITH KP");
setLayout(new BorderLayout());
Random r = new Random();
int n = r.nextInt(10);
if(n%2==0)
{
pl = true;
}
else
{
pl = false;
}
for(int i=0;i<9;i++)
{
flds[i] = new JTextField();
flds[i].addMouseListener(hld);
flds[i].setForeground(Color.BLACK);
flds[i].setHorizontalAlignment(JLabel.CENTER);
flds[i].setBorder(BorderFactory.createMatteBorder(0, 0, 0, 0, Color.red));
flds[i].setBackground(Color.CYAN);
flds[i].setFont(new Font("Times New Roma", Font.BOLD, 25));
flds[i].setEditable(false);
b.add(flds[i]);
}
lbl.setForeground(Color.BLUE);
lbl.setFont(new Font("Times New Roman", Font.BOLD, 25));
lbl.setBorder(BorderFactory.createMatteBorder(3, 3, 3, 3, Color.green));
lbl.setHorizontalAlignment(JLabel.CENTER);
l.add(lbl);
add(l, BorderLayout.NORTH);
add(b, BorderLayout.CENTER);
if(pl==true)
{
comp();
}
}
public class TextHandle extends MouseAdapter
{
@Override
public void mouseClicked(MouseEvent e) {
if(pl==false)
{
JTextField fld = (JTextField) e.getSource();
if(fld.getText().equals(""))
{
fld.setForeground(Color.red);
fld.setBorder(BorderFactory.createMatteBorder(3, 3, 3, 3, Color.red));
fld.setText("X");
char c = finish();
if(c=='U')
{
lbl.setText("You have won");
disable();
return;
}
else if(c=='O')
{
lbl.setText("Game Over. No one won");
disable();
return;
}
pl = true;
comp();
}
}
return;
}
}
public void disable()
{
for(int i=0;i<9;i++)flds[i].addMouseListener(null);
}
public void comp()
{
if(pl==true)
{
int n = bestClic();
flds[n].setForeground(Color.blue);
flds[n].setBorder(BorderFactory.createMatteBorder(3, 3, 3, 3, Color.BLUE));
flds[n].setText("O");
char c = finish();
if(c=='C')
{
lbl.setText("Computer has won");
disable();
return;
}
else if(c=='O')
{
lbl.setText("Game Over. No one won");
disable();
return;
}
pl = false;
}
return;
}
public int bestClic()
{
int num = 0;
if(flds[4].getText().equals(""))
{
num = 4;
}
else
{
num = free();
}
return num;
}
public int free()
{
int n = 0;
int c1, c2, c3, r1, r2, r3, x1, x2;
c1 = c2 = c3 = r1 = r2 = r3 = x1 = x2 = 0;
for(int i=0;i<9;i++)
{
if(i%3==0)
{
if(flds[i].getText().equals("O"))
{
c1++;
}
}
if(i%3==1)
{
if(flds[i].getText().equals("O"))
{
c2++;
}
}
if(i%3==2)
{
if(flds[i].getText().equals("O"))
{
c3++;
}
}
if(i<3)
{
if(flds[i].getText().equals("O"))
{
r1++;
}
}
else if(i<6)
{
if(flds[i].getText().equals("O"))
{
r2++;
}
}
else if(i<9)
{
if(flds[i].getText().equals("O"))
{
r3++;
}
}
if(i==0||i==4||i==8)
{
if(flds[i].getText().equals("O"))
{
x1++;
}
}
if(i==2||i==4||i==6)
{
if(flds[i].getText().equals("O"))
{
x2++;
}
}
}
if(c1==2 && freeCell("c1")>0)
{
return freeCell("c1");
}
else if(c2==2 && freeCell("c2")>0)
{
return freeCell("c2");
}
else if(c3==2 && freeCell("c3")>0)
{
return freeCell("c3");
}
else if(r1==2 && freeCell("r1")>0)
{
return freeCell("r1");
}
else if(r2==2 && freeCell("r2")>0)
{
return freeCell("r2");
}
else if(r3==2 && freeCell("r3")>0)
{
return freeCell("r3");
}
else if(x1==2 && freeCell("x1")>0)
{
return freeCell("x1");
}
else if(x2==2 && freeCell("x2")>0)
{
return freeCell("x2");
}
else
{
c1 = c2 = c3 = r1 = r2 = r3 = x1 = x2 = 0;
for(int i=0;i<9;i++)
{
if(i%3==0)
{
if(flds[i].getText().equals("X"))
{
c1++;
}
}
if(i%3==1)
{
if(flds[i].getText().equals("X"))
{
c2++;
}
}
if(i%3==2)
{
if(flds[i].getText().equals("X"))
{
c3++;
}
}
if(i<3)
{
if(flds[i].getText().equals("X"))
{
r1++;
}
}
else if(i<6)
{
if(flds[i].getText().equals("X"))
{
r2++;
}
}
else if(i<9)
{
if(flds[i].getText().equals("X"))
{
r3++;
}
}
if(i==0||i==4||i==8)
{
if(flds[i].getText().equals("X"))
{
x1++;
}
}
if(i==2||i==4||i==6)
{
if(flds[i].getText().equals("X"))
{
x2++;
}
}
}
if(c1==2 && freeCell("c1")>0)
{
return freeCell("c1");
}
else if(c2==2 && freeCell("c2")>0)
{
return freeCell("c2");
}
else if(c3==2 && freeCell("c3")>0)
{
return freeCell("c3");
}
else if(r1==2 && freeCell("r1")>0)
{
return freeCell("r1");
}
else if(r2==2 && freeCell("r2")>0)
{
return freeCell("r2");
}
else if(r3==2 && freeCell("r3")>0)
{
return freeCell("r3");
}
else if(x1==2 && freeCell("x1")>0)
{
return freeCell("x1");
}
else if(x2==2 && freeCell("x2")>0)
{
return freeCell("x2");
}
else
{
return findBest();
}
}
//return n;
}
public int findBest()
{
int num = 0;
if(flds[0].getText().equals(""))
{
return 0;
}
if(flds[2].getText().equals(""))
{
return 2;
}
if(flds[6].getText().equals(""))
{
return 6;
}
if((flds[8]).getText().equals(""))
{
return 8;
}
for(int i=0;i<9;i++)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
return num;
}
public int freeCell(String s)
{
int num = 0;
if(s.equals("c1"))
{
for(int i=0;i<9;i++)
{
if(i%3==0)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("c2"))
{
for(int i=0;i<9;i++)
{
if(i%3==1)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("c3"))
{
for(int i=0;i<9;i++)
{
if(i%3==2)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("r1"))
{
for(int i=0;i<9;i++)
{
if(i<3)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("r2"))
{
for(int i=0;i<9;i++)
{
if(i<6 && i>2)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("r3"))
{
for(int i=0;i<9;i++)
{
if(i<9 && i>5)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("x1"))
{
for(int i=0;i<9;i++)
{
if(i==0||i==4||i==8)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
else if(s.equals("x2"))
{
for(int i=0;i<9;i++)
{
if(i==2||i==4||i==6)
{
if(flds[i].getText().equals(""))
{
return i;
}
}
}
}
return num;
}
public char finish()
{
//int num = 0;
char win = 'N';
int c1, c2, c3, r1, r2, r3, x1, x2;
c1 = c2 = c3 = r1 = r2 = r3 = x1 = x2 = 0;
for(int i=0;i<9;i++)
{
if(i%3==0)
{
if(flds[i].getText().equals("X"))
{
c1++;
}
}
if(i%3==1)
{
if(flds[i].getText().equals("X"))
{
c2++;
}
}
if(i%3==2)
{
if(flds[i].getText().equals("X"))
{
c3++;
}
}
if(i<3)
{
if(flds[i].getText().equals("X"))
{
r1++;
}
}
else if(i<6)
{
if(flds[i].getText().equals("X"))
{
r2++;
}
}
else if(i<9)
{
if(flds[i].getText().equals("X"))
{
r3++;
}
}
if(i==0 || i==4 || i==8)
{
if(flds[i].getText().equals("X"))
{
x1++;
}
}
if(i==2 || i==4 || i==6)
{
if(flds[i].getText().equals("X"))
{
x2++;
}
}
}
if(c1 == 3|| c2 == 3|| c3 == 3 || r1 == 3 || r2 == 3 || r3 == 3 || x1 == 3 || x2 == 3)
{
return 'U';
}
c1 = c2 = c3 = r1 = r2 = r3 = x1 = x2 = 0;
for(int i=0;i<9;i++)
{
if(i%3==0)
{
if(flds[i].getText().equals("O"))
{
c1++;
}
}
if(i%3==1)
{
if(flds[i].getText().equals("O"))
{
c2++;
}
}
if(i%3==2)
{
if(flds[i].getText().equals("O"))
{
c3++;
}
}
if(i<3)
{
if(flds[i].getText().equals("O"))
{
r1++;
}
}
else if(i<6)
{
if(flds[i].getText().equals("O"))
{
r2++;
}
}
else if(i<9)
{
if(flds[i].getText().equals("O"))
{
r3++;
}
}
if(i==0 || i==4 || i==8)
{
if(flds[i].getText().equals("O"))
{
x1++;
}
}
if(i==2 || i==4 || i==6)
{
if(flds[i].getText().equals("O"))
{
x2++;
}
}
}
if(c1 == 3|| c2 == 3|| c3 == 3 || r1 == 3 || r2 == 3 || r3 == 3 || x1 == 3 || x2 == 3)
{
return 'C';
}
int cnt = 0;
for(int i=0;i<9;i++)
{
if(flds[i].getText().equals(""))
{
cnt++;
}
}
if(cnt==0)
{
win = 'O';
}
return win;
}
public static void main(String[] args) {
TicTacToe t = new TicTacToe();
t.setVisible(true);
t.setSize(350, 370);
t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
