java - 我有一个正在更改的数组，即使我没有专门更改它

Question

我正在编写一个 AI 来玩 Mancala，这是我的方法，其中 AI 的计算是通过检查所有 6 个可能的 Action 的结果来完成的。每次检查移动结果后，我使用数组 staticBoardState 将 boardState (存储有关板上所有孔的信息)恢复为其原始值，但 staticBoardState 似乎正在以奇怪的方式发生变化，即使我相信我这样做不改变它。我是一名初学者业余编码员，所以如果我的代码没有意义，请提问。这是我的代码:

public int getBotCalc(int boardState[]) {

    int[] staticBoardState = boardState;

    double[] movePoints = new double[6];
    int initialScore = boardState[6];
    int scorePoints;
    int freeTurnPoints;

    double bestMovePoints;
    int bestMove;

    for(int f = 0; f <= 5; f++) {

        boardState = staticBoardState;

        int botChoice = f;
        int botHole = boardState[botChoice];
        boardState[botChoice] = 0;

        for(int g = 0; g < botHole; g++) {

            botChoice++;
            if(botChoice>12) {
                botChoice = 0;
            }

            boardState[botChoice]++;
        }

        if(botChoice<=5&&boardState[botChoice]==1&&boardState[12-botChoice]>=1) {
            boardState[6] += boardState[12 - botChoice] + 1;

            boardState[botChoice] = 0;
            boardState[12 - botChoice] = 0;
        }

        scorePoints = boardState[6] - initialScore;
        if(botChoice==6) {
            freeTurnPoints = 1;
        } else {
            freeTurnPoints = 0;
        }

        movePoints[f] = scorePoints + (1.5 * freeTurnPoints);
    }

    bestMovePoints = movePoints[0];
    bestMove = 0;
    for(int f = 1; f <= 5; f++) {
        if(movePoints[f]>bestMovePoints) {
            bestMovePoints = movePoints[f];
            bestMove = f;
        }
    }

    boardState = staticBoardState;

    return bestMove;
}

非常感谢任何帮助。

Answer 1

您似乎将值类型赋值与引用赋值混淆了。当你写的时候

staticBoardState = boardState

所发生的情况是，staticBoardState 只是保存对内存中 boardState 也已经引用的数组的引用。它们并非都引用内存中的同一个数组，这就是为什么 staticBoardState 显然是通过使用 boardState 进行修改的。要解决此问题，您需要做的是将 staticBoardState 分配为新数组并显式复制其内容，例如使用 boardState.clone()，并在每次想要恢复 boardState 时执行类似的复制。