Minesweeper game code in Java

--> MineSweeper.java

public class MineSweeper {
    public static void main(String[] args) {
        Game game = new Game();

    }

}

--> Game.java

public class Game {
    private Board board;
    boolean finish = false;
    boolean win = false;
    int turn=0;
    
    public Jogo(){
        board = new Board();
        Play(board);
    }
    
    public void Play(Board board){
        do{
            turn++;
            System.out.println("Turn "+turn);
            board.show();
            finish = board.setPosition();
            
            if(!finish){
                board.openNeighbors();
                finish = board.win();
            }
            
        }while(!finish);
        
        if(board.win()){
            System.out.println("Congratulations, you let the 10 fields with the mines in "+turn+" turns");
            board.showMines();
        } else {
            System.out.println("Mine! You lost!");
            board.showMines();
        }
    }

}

--> Board.java

import java.util.Random;
import java.util.Scanner;

public class Board {
    private int[][] mines;
    private char[][] boardgame;
    private int Line, Column;
    Random random = new Random();
    Scanner input = new Scanner(System.in);
    
    public Board (){
        mines = new int[10][10];
        boardgame = new char[10][10];
        startMines();
        randomMines();
        fillTips();
        startBoard();
        
    }
    
    public boolean win(){
        int count=0;
        for(int line = 1 ; line < 9 ; line++)
            for(int column = 1 ; column < 9 ; column++)
                if(boardgame[line][column]=='_')
                    count++;
        if(count == 10)
            return true;
        else
            return false;                
    }
    
    public void openNeighbors(){
        for(int i=-1 ; i<2 ; i++)
            for(int j=-1 ; j<2 ; j++)
                if( (mines[Line+i][Column+j] != -1) && (Line != 0 && Line != 9 && Column != 0 && Column != 9) )
                    boardgame[Line+i][Column+j]=Character.forDigit(mines[Line+i][Column+j], 10);
        
    }
    
    public int getPosition(int Line, int Column){
        return mines[Line][Column];
    }
    
    public boolean setPosition(){
            
            do{
                System.out.print("\nLine: "); 
                Line = input.nextInt();
                System.out.print("Column: "); 
                Column = input.nextInt();
                
                if( (boardgame[Line][Column] != '_') && ((Line < 9 && Line > 0) && (Column < 9 && Column > 0)))
                    System.out.println("Field already shown");
                
                if( Line < 1 || Line > 8 || Column < 1 || Column > 8)
                    System.out.println("Choose a number between 1 and 8");
                
            }while((Line < 1 || Line > 8 || Column < 1 || Column > 8) || (boardgame[Line][Column] != '_') );
            
            if(getPosition(Line, Column)== -1)
                return true;
            else
                return false;
            
    }
    
    public void show(){
        System.out.println("\n     Lines");
        for(int Line = 8 ; Line > 0 ; Line--){
            System.out.print("       "+Line + " ");
            
            for(int Column = 1 ; Column < 9 ; Column++){
                    System.out.print("   "+ boardgame[Line][Column]);
            }
                
            System.out.println();
        }
            
        System.out.println("\n            1   2   3   4   5   6   7   8");
        System.out.println("                      Columns");
        
    }
    
    public void fillTips(){
        for(int line=1 ; line < 9 ; line++)
            for(int column=1 ; column < 9 ; column++){
                
                    for(int i=-1 ; i<=1 ; i++)
                        for(int j=-1 ; j<=1 ; j++)
                            if(mines[line][column] != -1)
                                if(mines[line+i][column+j] == -1)
                                    mines[line][column]++;
                
            }
            
    }
    
    public void showMines(){
        for(int i=1 ; i < 9; i++)
            for(int j=1 ; j < 9 ; j++)
                if(mines[i][j] == -1)
                    boardgame[i][j]='*';
        
        show();
    }
    
    public void startBoard(){
        for(int i=1 ; i<mines.length ; i++)
            for(int j=1 ; j<mines.length ; j++)
                boardgame[i][j]= '_';
    }
    
    public void startMines(){
        for(int i=0 ; i<mines.length ; i++)
            for(int j=0 ; j<mines.length ; j++)
                mines[i][j]=0;
    }
    
    public void randomMines(){
        boolean raffled;
        int Line, Column;
        for(int i=0 ; i<10 ; i++){
            
            do{
                Line = random.nextInt(8) + 1;
                Column = random.nextInt(8) + 1;
                
                if(mines[Line][Column] == -1)
                    raffled=true;
                else
                    raffled = false;
            }while(raffled);
            
            mines[Line][Column] = -1;
        }
    }
}

TicTacToe Game in Java

-->TicTacToe.java

public class TicTacToe {

    public static void main(String[] args) {
        Game game = new Game();
        
    }
}

-->Board.java

public class Board {
    private int[][] Board= new int[3][3];
    
    public Board(){
        clearBoard();
    }
    
    public void clearBoard(){
        for(int line=0 ; line<3 ; line++)
            for(int column=0 ; column<3 ; column++)
                Board[line][column]=0;
    }
    
    public void showBoard(){
        System.out.println();
        for(int line=0 ; line<3 ; line++){
        
            for(int column=0 ; column<3 ; column++){
                
                if(Board[line][column]==-1){
                    System.out.print(" X ");
                }
                if(Board[line][column]==1){
                    System.out.print(" O ");
                }
                if(Board[line][column]==0){
                    System.out.print("   ");
                }
                
                if(column==0 || column==1)
                    System.out.print("|");
            }
            System.out.println();
        }
                
    }

    public int getPosition(int[] attempt){
        return Board[attempt[0]][attempt[1]];
    }
    
    public void setPosition(int[] attempt, int player){
        if(player == 1)
            Board[attempt[0]][attempt[1]] = -1;
        else
            Board[attempt[0]][attempt[1]] = 1;
    }

    public int checkLines(){
        for(int line=0 ; line<3 ; line++){

            if( (Board[line][0] + Board[line][1] + Board[line][2]) == -3)
                return -1;
            if( (Board[line][0] + Board[line][1] + Board[line][2]) == 3)
                return 1;
        }
        
        return 0;
                
    }
    
    public int checkColumns(){
        for(int column=0 ; column<3 ; column++){

            if( (Board[0][column] + Board[1][column] + Board[2][column]) == -3)
                return -1;
            if( (Board[0][column] + Board[1][column] + Board[2][column]) == 3)
                return 1;
        }
        
        return 0;
                
    }
    
    public int checkDiagonals(){
        if( (Board[0][0] + Board[1][1] + Board[2][2]) == -3)
            return -1;
        if( (Board[0][0] + Board[1][1] + Board[2][2]) == 3)
            return 1;
        if( (Board[0][2] + Board[1][1] + Board[2][0]) == -3)
            return -1;
        if( (Board[0][2] + Board[1][1] + Board[2][0]) == 3)
            return 1;
        
        return 0;
    }

    public boolean fullBoard(){
        for(int line=0 ; line<3 ; line++)
            for(int column=0 ; column<3 ; column++)
                if( Board[line][column]==0 )
                    return false;
        return true;
    }
}

-->Game.java

import java.util.Scanner;

public class Game {
    private Board board;
    private int turn=1, who=1;
    private Player player1;
    private Player player2;
    public Scanner input = new Scanner(System.in);

    
    public Game(){
        board = new Board();
        startPlayers();
        
        while( Play() );
    }
    
    public void startPlayers(){
        System.out.println("Who will be player1 ?");
        if(choosePlayer() == 1)
            this.player1 = new Human(1);
        else
            this.player1 = new Computer(1);
        
        System.out.println("----------------------");
        System.out.println("Who will be Player 2 ?");
        
        if(choosePlayer() == 1)
            this.player2 = new Human(2);
        else
            this.player2 = new Computer(2);
        
    }
    
    public int choosePlayer(){
        int option=0;
        
        do{
            System.out.println("1. Human");
            System.out.println("2. Computer\n");
            System.out.print("Option: ");
            option = input.nextInt();
            
            if(option != 1 && option != 2)
                System.out.println("Invalid Option! Try again");
        }while(option != 1 && option != 2);
        
        return option;
    }
    
    public boolean Play(){
        board.showBoard();
        if(won() == 0 ){
            System.out.println("----------------------");
            System.out.println("\nTurn "+turn);
            System.out.println("It's turn of Player " + who() );
            
            if(who()==1)
                player1.play(board);
            else
                player2.play(board);
            
            
            if(board.fullBoard()){
                System.out.println("Full Board. Draw!");
                return false;
            }
            who++;
            turn++;

            return true;
        } else{
            if(won() == -1 )
                System.out.println("Player 1 won!");
            else
                System.out.println("Player 2 won!");
            
            return false;
        }
            
    }
    
    public int who(){
        if(who%2 == 1)
            return 1;
        else
            return 2;
    }
    
    public int won(){
        if(board.checkLines() == 1)
            return 1;
        if(board.checkColumns() == 1)
            return 1;
        if(board.checkDiagonals() == 1)
            return 1;
        
        if(board.checkLines() == -1)
            return -1;
        if(board.checkColumns() == -1)
            return -1;
        if(board.checkDiagonals() == -1)
            return -1;
        
        return 0;
    }
    
    
}

-->Player.java

public abstract class Player {
    
    protected int[] attempt = new int[2];
    protected int player;

    
    public Player(int player){
        this.player = player;
    }
    
    public abstract void play(Board board);
    
    public abstract void Try(Board board);

    public boolean checkTry(int[] attempt, Board board){
        if(board.getPosition(attempt) == 0)
            return true;
        else
            return false;

            
    }
    
}

-->Human.java

import java.util.Scanner;

public class Human extends Player{
    public Scanner input = new Scanner(System.in);
    
    public Human(int player){
        super(player);
        this.player = player;
        System.out.println("Player 'Human' created!");
    }
    
    @Override
    public void play(Board board){
        Try(board);
        board.setPosition(attempt, player);
    }
    
    @Override
    public void Try(Board board){
        do{
            do{
                System.out.print("Line: ");
                attempt[0] = input.nextInt();
                
                if( attempt[0] > 3 ||attempt[0] < 1)
                    System.out.println("Invalid line. It's 1, 2 or 3");
                
            }while( attempt[0] > 3 ||attempt[0] < 1);
            
            do{
                System.out.print("Column: ");
                attempt[1] = input.nextInt();
                
                if(attempt[1] > 3 ||attempt[1] < 1)
                    System.out.println("Invalid column. É 1, 2 or 3");
                
            }while(attempt[1] > 3 ||attempt[1] < 1);
            
            attempt[0]--; 
            attempt[1]--;
            
            if(!checkTry(attempt, board))
                System.out.println("Placed already marked. Try other.");
        }while( !checkTry(attempt, board) );
    }
}

-->Computer.java

public class Computer extends Player{
    
    public Computer(int player){
        super(player);
        System.out.println("Player 'Computer' created");
    }
    
    @Override
    public void play(Board board){
        
    }
    
    @Override
    public void Try(Board board){
        
    }
} 

Battleship game in Java

import java.util.Random;
import java.util.Scanner;

public class battleShip {

    public static void main(String[] args) {
        int[][] board = new int[5][5];
        int[][] ships = new int[3][2];
        int[] shoot = new int[2];
        int attempts=0,
            shotHit=0;
       
        initBoard(board);
        initShips(ships);
       
        System.out.println();
       
        do{
            showBoard(board);
            shoot(shoot);
            attempts++;
           
            if(hit(shoot,ships)){
                hint(shoot,ships,attempts);
                shotHit++;
            }               
            else
                hint(shoot,ships,attempts);
           
            changeboard(shoot,ships,board);
           

        }while(shotHit!=3);
       
        System.out.println("\n\n\nBattleship Java game finished! You hit 3 ships in

"+attempts+" attempts");
        showBoard(board);
    }
   
    public static void initBoard(int[][] board){
        for(int row=0 ; row < 5 ; row++ )
            for(int column=0 ; column < 5 ; column++ )
                board[row][column]=-1;
    }
   
    public static void showBoard(int[][] board){
        System.out.println("\t1 \t2 \t3 \t4 \t5");
        System.out.println();
       
        for(int row=0 ; row < 5 ; row++ ){
            System.out.print((row+1)+"");
            for(int column=0 ; column < 5 ; column++ ){
                if(board[row][column]==-1){
                    System.out.print("\t"+"~");
                }else if(board[row][column]==0){
                    System.out.print("\t"+"*");
                }else if(board[row][column]==1){
                    System.out.print("\t"+"X");
                }
               
            }
            System.out.println();
        }

    }

    public static void initShips(int[][] ships){
        Random random = new Random();
       
        for(int ship=0 ; ship < 3 ; ship++){
            ships[ship][0]=random.nextInt(5);
            ships[ship][1]=random.nextInt(5);
           
            //let's check if that shot was already tried
            //if it was, just finish the do...while when a new pair was randomly selected
            for(int last=0 ; last < ship ; last++){
                if( (ships[ship][0] == ships[last][0])&&(ships[ship][1] == ships[last][1])

)
                    do{
                        ships[ship][0]=random.nextInt(5);
                        ships[ship][1]=random.nextInt(5);
                    }while( (ships[ship][0] == ships[last][0])&&(ships[ship][1] == ships

[last][1]) );
            }
           
        }
    }

    public static void shoot(int[] shoot){
        Scanner input = new Scanner(System.in);
       
        System.out.print("Row: ");
        shoot[0] = input.nextInt();
        shoot[0]--;
       
        System.out.print("Column: ");
        shoot[1] = input.nextInt();
        shoot[1]--;
       
    }
   
    public static boolean hit(int[] shoot, int[][] ships){
       
        for(int ship=0 ; ship<ships.length ; ship++){
            if( shoot[0]==ships[ship][0] && shoot[1]==ships[ship][1]){
                System.out.printf("You hit a ship located in (%d,%d)\n",shoot[0]+1,shoot

[1]+1);
                return true;
            }
        }
        return false;
    }

    public static void hint(int[] shoot, int[][] ships, int attempt){
        int row=0,
            column=0;
       
        for(int line=0 ; line < ships.length ; line++){
            if(ships[line][0]==shoot[0])
                row++;
            if(ships[line][1]==shoot[1])
                column++;
        }
       
        System.out.printf("\nHint %d: \nRow %d -> %d ships\n" +
                                 "Column %d -> %d ships\n",attempt,shoot[0]+1,row,shoot

[1]+1,column);
    }

    public static void changeboard(int[] shoot, int[][] ships, int[][] board){
        if(hit(shoot,ships))
            board[shoot[0]][shoot[1]]=1;
        else
            board[shoot[0]][shoot[1]]=0;
    }
}