java - 骑士之旅随机移动选择器不起作用

Question

我正在努力随机化我的骑士在我的骑士旅行代码中采取的行动。但出于某种原因，我的 switch 语句总是进入默认状态，而不是执行可能的移动。我知道我可能的移动方法有效，因为我已经单独运行了它自己的 firstMoveChoice() 并且它有效。所以我知道问题出在我的随机移动选择器上，但我似乎无法弄清楚。

感谢您提前提供的帮助和时间!非常感谢，因为我已经查看了这个问题但找不到答案。

public class MoveKnight extends Moves {

public int[][] moveTheKnight() {

    Moves switchBetweenMoves = new Moves();
    switchBetweenMoves.startingLocation();

    while (knight != 64) {
        int randomMove = new Random().nextInt();
        switch (randomMove) {
            case 1:
                switchBetweenMoves.firstMoveChoice();
                break;

            case 2:
                switchBetweenMoves.secondMoveChoice();
                break;

            case 3:
                switchBetweenMoves.thirdMoveChoice();
                break;

            // other possible moves

            default:
                System.out.println("No more possible moves.");
                break;
        }
        break;
    }
    return board;
}
}

这是上面代码的结果:

1  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
0  0  0  0  0  0  0  0  
No more possible moves.
BUILD SUCCESSFUL (total time: 0 seconds)

这是我的主要方法:

public static void main(String[] args) {

    MoveKnight myKnight = new MoveKnight();
    myKnight.moveTheKnight();
}

这是我的 ChessBoard 类:

public class ChessBoard {

int[][] board;

public ChessBoard() {
    this.board = new int[8][8];
}
}

这里是firstMoveChoice()

public int[][] firstMoveChoice() {

System.out.println();

x += 1;
y += 2;

if (x >= board.length) { // this tests to make sure the knight does not move off the row
    System.out.println("Cannot move off board on x axis\n");
    x -= 1;
    y -= 2;
    return board;
}
else if (y >= board.length) { // this tests to make sure the knight does not move off the column
    System.out.println("Cannot move off board on y axis\n");
    x -= 1;
    y -= 2;
    return board;
}
else if (board[x][y] != 0) { // this prevents the knight from landing on a previously landed on square
    x -= 1;
    y -= 2;
    System.out.println("Cannot move onto a used square\n");
    return board;
}
else { // this moves the knight when the above statements are false
    board[x][y] = ++knight;
    System.out.println("This executed and the knight moved\n");

    for(int[] row : board) {
        printRow(row);
    }

    if (knight == 64) {
        System.out.println("Knight has completed the tour");
        }

        return board;
    }
}

这里是thirdMoveChoice():它实际上与其他所有相同，除了不同移动的数字变化之外。

public int[][] thirdMoveChoice() {

System.out.println();

x += 2;
y -= 1;

if (x >= board.length) { // this tests to make sure the knight does not move off the row
    System.out.println("Cannot move off board on x axis\n");
    x -= 2;
    y += 1;
    return board;
}
else if (y >= board.length) { // this tests to make sure the knight does not move off the column
    System.out.println("Cannot move off board on y axis\n");
    x -= 2;
    y += 1;
    return board;
}
else if (board[x][y] != 0) { // this prevents the knight from landing on a previously landed on square
    x -= 2;
    y += 1;
    System.out.println("Cannot move onto a used square\n");
    return board;
}
else { // this moves the knight when the above statements are false
    board[x][y] = ++knight;
    System.out.println("This executed and the knight moved\n");
}

for(int[] row : board) {
    printRow(row);
}

if (knight == 64) {
    System.out.println("Knight has completed the tour");
    return board;
}

return board;
}

Answer 1

这是因为 random.nextInt() 返回的值介于 -2,147,483,648 和 2,147,483,647 之间

您应该使用 random.nextInt(int n) 返回介于 0 和 n 之间的值(包含 0 和 n 除外)

所以替换

int randomMove = new Random().nextInt(); b

由

int randomMove = 1 + new Random().nextInt(3);

此外，您应该将 new Random() 分配给将重用的字段。