Netbeans 建议将字段转换为最终字段，尽管我修改了该字段

Question

首先，这里是相关代码：

public class AtCounter
{
    private char[][] atMat;
    private int atCount;

    public AtCounter()
    {
        atCount=0;
        atMat= new char[][]{{'@','-','@','-','-','@','-','@','@','@'},
                            {'@','@','@','-','@','@','-','@','-','@'}, 
                            {'-','-','-','-','-','-','-','@','@','@'}, 
                            {'-','@','@','@','@','@','-','@','-','@'}, 
                            {'-','@','-','@','-','@','-','@','-','@'}, 
                            {'@','@','@','@','@','@','-','@','@','@'}, 
                            {'-','@','-','@','-','@','-','-','-','@'}, 
                            {'-','@','@','@','-','@','-','-','-','-'}, 
                            {'-','@','-','@','-','@','-','@','@','@'}, 
                            {'-','@','@','@','@','@','-','@','@','@'}};

    }

    public int countAts(int r, int c)
    {

        if(r<atMat.length && c<atMat[0].length && r>=0 && c>=0 && atMat[r][c]=='@')
        {
            atMat[r][c]='X';
            atCount++;
        }
        else
            if(r-1<atMat.length && r-1>=0)
                countAts(r-1,c);
        else
                if(r+1<atMat.length && r+1>=0)
                    countAts(r+1,c);
        else
                    if(c-1<atMat[0].length && c-1>=0)
                        countAts(r,c-1);
        else
                        if(c+1<atMat[0].length && c+1>=0)
                            countAts(r,c+1);
        return atCount;

    }

请注意，countsAts 方法包含行 atMat[r][c]='X';，它会更改二维数组中元素的值。尽管如此，在行 private char[][] atMat; 上，Netbeans 给了我警告 "Field atMat can be final"。如果我正在修改它的值，为什么这个字段可以是最终的？是不是和我现在修改的代码中的where有关系？ Netbeans 是否被窃听（怀疑）？如果有人可以解释警告，我将不胜感激！

Answer 1

您可以更改名称 atMat 引用的对象的内容。 atMat 是一个参考。引用本身可以成为最终的。

Netbeans 建议将字段转换为最终字段，尽管我修改了该字段

Netbeans is suggesting to convert a field to a final despite the fact that I modify this field

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