Question

首先，这是相关代码：

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private char[][] atMat;一行，Netbeans给了我警告＆＃34; Field atMat可以是最终的＃34;。如果我要修改它的值，为什么这个字段能够成为最终字段？它是否与我正在修改它的代码中的 where 有关？ Netbeans是否被窃听（怀疑）？如果有人能解释警告，我将非常感激！

Answer 1

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

尽管我修改了这个字段，Netbeans仍然建议将字段转换为final

1 个答案: