Java 游戏无法仅在 CMD 中在 Java 中启动

Question

我是初学者，我使用教程代码构建了这个战舰游戏，并且更改了基本内容，例如舰船数量以及列数和行数。 Java 不会以 .jar 文件的形式启动我的游戏。它仅在 CMD 中启动。请注意，我的笔记本电脑已修复，我可以正常打开任何 .jar 文件。是因为我的游戏实际上没有 UI 吗？或者问题出在我的 list 文件中？昨天是我第一次编译为 .jar 文件。

list

Main-Class: BattleShip

Java代码

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

public class BattleShip {

public static void main(String[] args) {
    int[][] board = new int[7][7];
    int[][] ships = new int[5][2];
    int[] shoot = new int[2];
    int attempts=0,
        shotHit=0;

    //method initBoard is triggered to create the board with the number '-1' 
   in all positions
    initBoard(board);
    //method initShips is triggered to fill the position of the 5 ships (row 
   and column)
    initShips(ships);

    System.out.println();

    //the game begins using a do...while loop, game goes on until the player 
hits the 5 ships
    do{
        showBoard(board);
        shoot(shoot);
        attempts++;

        if(hit(shoot,ships)){
            hint(shoot,ships,attempts);
            shotHit++;
        }                
        else
            hint(shoot,ships,attempts);

        changeboard(shoot,ships,board);

    //condition of the loop is "shotHit!=5'
    }while(shotHit!=5);

    System.out.println("\n\n\nWell done soldier! You've destroyed 5 enemy 
   ships in "+attempts+" attempts");
    showBoard(board);
}
//sets the value -1 in all blocks of the board
public static void initBoard(int[][] board){
    for(int row=0 ; row < 7 ; row++ )
        for(int column=0 ; column < 7 ; column++ )
            board[row][column]=-1;
}
//gets the int matrix and shows the board game
public static void showBoard(int[][] board){
    System.out.println("\t1 \t2 \t3 \t4 \t5 \t6 \t7");
    System.out.println();

    for(int row=0 ; row < 7 ; row++ ){
        System.out.print((row+1)+"");
        for(int column=0 ; column < 7 ; 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();
    }

}

//this method randomly select 5 pairs of integers numbers, which are the 
location of the 5 ships
public static void initShips(int[][] ships){
    Random random = new Random();

    for(int ship=0 ; ship < 5 ; ship++){
        ships[ship][0]=random.nextInt(7);
        ships[ship][1]=random.nextInt(7);

        //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(7);
                    ships[ship][1]=random.nextInt(7);
                }while( (ships[ship][0] == ships[last][0])&&(ships[ship][1] 
                 == ships[last][1]) );
        }

    }
}

//gets a shot (row and column) of the user, and stores in variable shot []
 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]--;

}

//checks if given shot hit a ship
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("What a SOLDIER! You hit an enemy ship located 
     in (%d,%d) with a hellstorm missle\n",shoot[0]+1,shoot[1]+1);
            return true;
        }
    }
    return false;
}

//give a hint of how many ships are in that row and that column where the 
shot was given
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);
}

//after the shot is given, the board is changed, showing that the shot was 
give (if hit or missed)
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;
}
}

Answer 1

您的输出是默认的System.out。这意味着需要有一些实体捕获该输出并将其显示给用户。

如果您在 cmd 中运行 .jar 文件，则 cmd 将充当该实体。

如果您只是双击.jar，则没有人捕获输出 - 因此它会被丢弃。您的应用程序仍在运行，只是未显示输出。

如何解决？要么使用 System.out 以外的输出方法(例如文本文件)，要么明确说明应用程序只能从命令行运行(这是一件非常好的事情) .

如果您不想，您还可以创建一个简单的 .bat 文件，该文件打开 cmd 并在其中运行 .jar让用户手动执行命令行命令。