java - 我有一个正在更改的数组，即使我没有专门更改它

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种可能动作的结果来完成的。每次检查移动结果后，我都使用数组staticBoardState将boardState（存储有关板上所有孔的信息）恢复为原始值，但是即使我相信我这样做，staticBoardState似乎也在以奇怪的方式变化不改变它。我是初学者业余编码器，所以如果我的代码没有意义，请提出问题。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;
}

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最佳答案

您似乎将值类型分配与引用分配混淆了。当你写


  staticBoardState = boardState


发生的是staticBoardState只是在内存中保留了对boardState也已经在引用的数组的引用。并非两者都指向内存中的同一数组，这就是为什么staticBoardState显然是通过使用boardState进行修改的原因。要解决此问题，您需要将staticBoardState分配为新数组，并显式复制其内容（例如使用boardState.clone()），并在每次要恢复boardState时执行类似的复制。