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TicTacToe.java
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TicTacToe.java
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import java.util.Scanner;
import java.util.Random;
public class TicTacToe {
public static void main(String[] args){
System.out.println("TicTacToe!...^-^");
bot();
}
public static void bot(){
Scanner obj = new Scanner(System.in);
String[] array = new String[11];
int n=9;
for(int i=0;i<n;i++){
array[i] = "-";
}
array[10] = "n";
int win = 0;
System.out.println("Easy(E) or Hard(H) Mode : ");
try{
String eh = obj.nextLine();
if(eh.equals("e") | eh.equals("E")){
System.out.println("Easy Mode");
while(win == 0){
array = userinput(array);
win = checkForWin(array);
if(win==1) break;
array = botInput1(array);
win = checkForWin(array);
}
}
else if(eh.equals("h") | eh.equals("H")){
System.out.println("Hard Mode");
while(win == 0){
array = userinput(array);
win = checkForWin(array);
if(win==1) break; // User Input 1
array = botInput0(array);
win = checkForWin(array);
if(win==1) break; // Computer Input 1 - O is placed at random
array = userinput(array);
win = checkForWin(array);
if(win==1) break; // User Input 2
array = botInput2(array);
win = checkForWin(array);
if(win==1) break; // Computer Input 2 - Checks for whether X wins, or chooses the best position for O
array = userinput(array);
win = checkForWin(array);
if(win==1) break; // User Input 3
array = botInput3(array);
win = checkForWin(array);
if(win==1) break; // Computer Input 3 - Checks whether O can win in next move or Checks whether X wins
array = userinput(array);
win = checkForWin(array);
if(win==1) break; // User Input 4
array = botInput3(array);
win = checkForWin(array);
if(win==1) break; // Computer Input 4 - Checks whether O can win in next move or Checks whether X wins
array = userinput(array);
win = checkForWin(array);
if(win==1) break; // User Input 5
}
}
else{
System.out.println("Enter \"E\" or \"H\" ");
bot();
}
}
catch(Exception e){
System.out.println("Enter \"E\" or \"H\" ");
bot();
}
tryagain();
}
public static void tryagain(){
Scanner obj = new Scanner(System.in);
System.out.print("Want to try again(Y/N) : ");
try{
String agn = obj.nextLine();
if(agn.equals("Y") || agn.equals("y")){
bot();
}
else if(agn.equals("N") || agn.equals("n")){
}
else{
System.out.println("Enter \"Y\" or \"N\" ");
tryagain();
}
}
catch(Exception e){
System.out.println("Enter \"Y\" or \"N\" ");
tryagain();
}
}
public static void printTheGame(String[] array){
for(int i=0;i<9;i=i+3){
System.out.println(" "+array[i]+"|"+array[i+1]+"|"+array[i+2]);
}
}
public static String[] userinput(String[] array){
try{
Scanner obj = new Scanner(System.in);
System.out.print("Player : ");
int x = obj.nextInt();
if(array[x-1].compareTo("-")!=0){
System.out.println("Already Filled!!..Try again..");
userinput(array);
}
else array[x-1] = "X";
printTheGame(array);
}
catch(Exception e){
System.out.println("Enter in digits..(1-9)");
userinput(array);
}
return array;
}
public static String[] botInput0(String[] array){
if(array[4].equals("X")){
return botInput1(array);
}
else{
array[4] = "O";
System.out.println("Computer : 5");
printTheGame(array);
return array;
}
}
public static String[] botInput1(String[] array){
Random robj = new Random();
int y = robj.nextInt(1,9);
if(array[y-1].compareTo("-")!=0){
botInput1(array);
}
else array[y-1] = "O";
System.out.println("Computer : "+y);
printTheGame(array);
return array;
}
public static String[] a1(String[] array, int a, int b, int c){
if(array[a].equals("X") & array[b].equals("X") & array[c].equals("-")){
System.out.println("Computer : "+ (c+1)); array[c]="O"; printTheGame(array); array[10]="y"; return array;}
else return array;
}
public static String[] a2(String[] array, int a, int b, int c){
if(array[a].equals("O") & array[b].equals("-") & array[c].equals("-")){
System.out.println("Computer : "+ (c+1)); array[c]="O"; printTheGame(array); array[10]="y"; return array;}
else return array;
}
public static String[] a3(String[] array, int a, int b, int c){
if(array[a].equals("O") & array[b].equals("O") & array[c].equals("-")){
System.out.println("Computer : "+ (c+1)); array[c]="O"; printTheGame(array); array[10]="y"; return array;}
else return array;
}
public static boolean ss(String[] array){
if(array[10].equals("y")) {array[10] = "n"; return true;}
else return false;
}
public static String[] botInput2(String[] array){
// checks whether X is going to win and block
for(int i=0;i<9;i=i+3){
a1(array, i, i+1, i+2); if(ss(array)) return array;
a1(array, i, i+2, i+1); if(ss(array)) return array;
a1(array, i+2, i+1, i); if(ss(array)) return array;
}
for(int i=0;i<3;i++){
a1(array, i, i+3, i+6); if(ss(array)) return array;
a1(array, i, i+6, i+3); if(ss(array)) return array;
a1(array, i+6, i+3, i); if(ss(array)) return array;
}
a1(array, 0, 4, 8); if(ss(array)) return array;
a1(array, 0, 8, 4); if(ss(array)) return array;
a1(array, 8, 4, 0); if(ss(array)) return array;
a1(array, 2, 4, 6); if(ss(array)) return array;
a1(array, 2, 6, 4); if(ss(array)) return array;
a1(array, 6, 4, 2); if(ss(array)) return array;
// Finding suitable place for O to place
for(int i=0;i<9;i=i+3){
a2(array, i, i+1, i+2); if(ss(array)) return array;
a2(array, i, i+2, i+1); if(ss(array)) return array;
a2(array, i+2, i+1, i); if(ss(array)) return array;
}
for(int i=0;i<3;i++){
a2(array, i, i+3, i+6); if(ss(array)) return array;
a2(array, i, i+6, i+3); if(ss(array)) return array;
a2(array, i+6, i+3, i); if(ss(array)) return array;
}
a2(array, 0, 4, 8); if(ss(array)) return array;
a2(array, 0, 8, 4); if(ss(array)) return array;
a2(array, 8, 4, 0); if(ss(array)) return array;
a2(array, 2, 4, 6); if(ss(array)) return array;
a2(array, 2, 6, 4); if(ss(array)) return array;
a2(array, 6, 4, 2); if(ss(array)) return array;
botInput1(array);
return array;
}
public static String[] botInput3(String[] array){
// Choose Shortcut to Win
for(int i=0;i<9;i=i+3){
a3(array, i, i+1, i+2); if(ss(array)) return array;
a3(array, i, i+2, i+1); if(ss(array)) return array;
a3(array, i+2, i+1, i); if(ss(array)) return array;
}
for(int i=0;i<3;i++){
a3(array, i, i+3, i+6); if(ss(array)) return array;
a3(array, i, i+6, i+3); if(ss(array)) return array;
a3(array, i+6, i+3, i); if(ss(array)) return array;
}
a3(array, 0, 4, 8); if(ss(array)) return array;
a3(array, 0, 8, 4); if(ss(array)) return array;
a3(array, 8, 4, 0); if(ss(array)) return array;
a3(array, 2, 4, 6); if(ss(array)) return array;
a3(array, 2, 6, 4); if(ss(array)) return array;
a3(array, 6, 4, 2); if(ss(array)) return array;
// Checks whether X is going to win and block
for(int i=0;i<9;i=i+3){
a1(array, i, i+1, i+2); if(ss(array)) return array;
a1(array, i, i+2, i+1); if(ss(array)) return array;
a1(array, i+2, i+1, i); if(ss(array)) return array;
}
for(int i=0;i<3;i++){
a1(array, i, i+3, i+6); if(ss(array)) return array;
a1(array, i, i+6, i+3); if(ss(array)) return array;
a1(array, i+6, i+3, i); if(ss(array)) return array;
}
a1(array, 0, 4, 8); if(ss(array)) return array;
a1(array, 0, 8, 4); if(ss(array)) return array;
a1(array, 8, 4, 0); if(ss(array)) return array;
a1(array, 2, 4, 6); if(ss(array)) return array;
a1(array, 2, 6, 4); if(ss(array)) return array;
a1(array, 6, 4, 2); if(ss(array)) return array;
botInput2(array);
return array;
}
public static Integer checkForWin(String[] array){
// Checks whether User or Computer won the game
for(int i=0;i<9;i=i+3){
if(array[i].equals("X") & array[i+1].equals("X") & array[i+2].equals("X")){
printPlayerWin(); return 1;}
if(array[i].equals("O") & array[i+1].equals("O") & array[i+2].equals("O")){
printComputerWin(); return 1;}
}
for(int i=0;i<3;i++){
if(array[i].equals("X") & array[i+3].equals("X") & array[i+6].equals("X")){
printPlayerWin(); return 1;}
if(array[i].equals("O") & array[i+3].equals("O") & array[i+6].equals("O")){
printComputerWin(); return 1;}
}
if(array[0].equals("X") & array[4].equals("X") & array[8].equals("X")){
printPlayerWin(); return 1;}
if(array[0].equals("O") & array[4].equals("O") & array[8].equals("O")){
printComputerWin(); return 1;}
if(array[2].equals("X") & array[4].equals("X") & array[6].equals("X")){
printPlayerWin(); return 1;}
if(array[2].equals("O") & array[4].equals("O") & array[6].equals("O")){
printComputerWin(); return 1;}
int z = 0;
for(int i=0;i<9;i++){
if(array[i].compareTo("-")!=0){
z++;
if(z==9){
System.out.println("DRAW Match...");
return 1;
}
}
}
return 0;
}
public static void printPlayerWin(){
System.out.println("Player...WON...^-^.");
}
public static void printComputerWin(){
System.out.println("Computer...WON...-_-.");
}
}