Restart java program

Question

I was hoping to get some help. I have a java game of battleship and wanted to give the player the option to play again when they finished, but don't really know how. Any help will be great!

public class Battle {

public static void main(String[] args) throws IOException{

    int[][] board = new int[5][5];
    int[][] ships = new int[3][2];
    int[] shoot = new int[2];
    int size;//for the fleet, under construction!
    int health= 3;
    int attempts=0,
        shotHit=0;
    boolean sendout = false;

    //reads the rules

    File myFile = new File ("Rules.txt");
    Scanner inputFile = new Scanner(myFile);

    while (inputFile.hasNext())
        {
            String str = inputFile.nextLine();
            System.out.println(str);
        }
    inputFile.close();


    Scanner position = new Scanner(System.in);

    whatShip ship = new whatShip(health);
    health = ship.WhatShip(health);



    System.out.println("\n");
    System.out.println("Enter the name of your vessel:");
    String name = position.nextLine();

    //intro read

    System.out.println("\n");
    System.out.println("INTRO");
    System.out.println("\n");
    System.out.println("Onbard the "+name);
    File myFile1 = new File ("Intro.txt");
    Scanner inputFile1 = new Scanner(myFile1);

    while (inputFile1.hasNext())
    {
        String str = inputFile1.nextLine();
        System.out.println(str);
    }
    inputFile1.close();
    System.out.println("\n");



    int row = entryIntMinMax("Enter "+name+"'s longitude, row", 1, 5);





    int col = entryIntMinMax("Enter "+name+"'s latitude, column",1,5);





    System.out.println("ALL HANDS, MAN YOUR STATIONS");

    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);
        health =enemyShoot(row, col, health);
        health =enemyShoot(row, col, health);
        health =enemyShoot(row, col, health);
        health =enemyShoot(row, col, health);
        health =enemyShoot(row, col, health);
        health =enemyShoot(row, col, health);
        health =enemyShoot(row, col, health);

        changeboard(shoot, ships, board);


    }


    while(shotHit!=3);

    System.out.println("\n\n Enemy fleet destroyed sir! You sunk 3 ships in "+attempts+" attempts");
    showBoard(board);
}

Here is my main method. Any criticism would also be great!

Answer 1

First, put (almost) everthing in the first section of the above code (until the do-while statement) in a introPhase() method or something.

Secondly, put your do-while in a second gamePhase() method or something.

Finally, surround both with a conditional loop statement of some sort.

You should end up with something like this:

boolean finishFlag = false;
while(!finishFlag) {
    introPhase();
    gamePhase();
    finishFlag = getExitInfoFromUser();
}

Good luck!

Answer 2

Heres another more abstract and simple example on how it could look like.

Define classes, method and variables in order to make it more easy to work with the things you are programming.

// Game class, here you define what the game would look like
public class Game {
    private Scanner scanner = new Scanner(System.in);
    // Could probably create a class Board and work on this class.
    // private Board board;
    private int[][] board;
    // Could probably create a class Ship and work on this class.
    // Could also include the two dimensional array in the Board class
    // private Ship[][] ships board;
    private int[][] ships;
    // Could probably create a class Player and work on this class.
    // private Player board;
    private int attemtps;
    private int health;

    // Define a status the game is currently in
    private enum Status {
        IDLE, STARTED, ENDED;
    }

    // Variable for the current game status
    private Status gamestatus;

    // Nothing done, default is idle when new game class is initialized
    // Maybe you have options and stuff and a menu, where you IDLE at.
    public Game() {
        gamestatus = Status.IDLE;
    }

    // This method "starts" the game, though defines variables to 
    // have Game beeing started
    public void start() {
        System.out.println("Welcome to battleship");
        // Change status, maybe you want to validate the current gamestatus 
        // at some point
        gamestatus = Status.STARTED;
        // this method could initialize some variables and stuff to default values in order to represent a fresh game
        setInitialValuesOfGame();
        // Random loop that gets 5 inputs and emulates a game due to this.
        int i = 0;
        while(gamestatus.equals(Status.STARTED)) {
            System.out.println("Test input: ");
            String input = scanner.nextLine();
            // Just make it look like there would happen something
            board[i%5][0] = i;
            ships[i%3][0] = i;
            // Make game look like it did end after a few iteration
            ++i;
            if(i == 5) {
               end();
            }
        }
        // Loop is over, ask for restart
        restart();
    }

    public void restart() {
        System.out.println("Hey would you like to restart: yes"); // Making it look like input
        String input = "yes"; // Input here, but make it a literal for showing purposes
        if (input.equals("yes")) {
            start();
        } else {
            System.out.println("bye bye");
        }
    }

    public void end() {
        gamestatus = Status.ENDED;
        // Do more stuff that would make the game end
    }

    // Setting default values
    private void setInitialValuesOfGame() {
        board = new int[5][5];
        ships = new int[3][2];
        attemtps = 0;
        health = 3;
    }

    // This is just your starting point, i´d programm as less as possible in here.
    public static void main(String[] args) {
        Game game = new Game();
        game.start();
    }
}