java - ReplaceAll 不适用于 String[] 元素

Question

我需要编写使用 FEN 作为创建棋盘的参数的国际象棋程序。为了简化这个过程，我想用replaceAll方法用等量的“1”替换该数字的数字(看看我的代码)。不幸的是这不起作用，我不知道为什么。有人可以告诉我应该采取什么不同的做法吗？

String[] read2 = new String[] {"rnbqkbnr", "pppppppp", "8", "8", "8", "8", "PPPPPPPP", "RNBQKBNR"};         
for (int i = 0; i < 8; i++ ) {
    System.out.println(read2[i]);
    read2[i].replaceAll("8", "11111111");
    read2[i].replaceAll("7", "1111111");
    read2[i].replaceAll("6", "111111");
    read2[i].replaceAll("5", "11111");
    read2[i].replaceAll("4", "1111");
    read2[i].replaceAll("3", "111");
    read2[i].replaceAll("2", "11");
    System.out.println(read2[i]);   
}

输出为

rnbqkbnrrnbqkbnrpppppppppppppppp88888888PPPPPPPPPPPPPPPPRNBQKBNRRNBQKBNR

但应该是

rnbqkbnrrnbqkbnrpppppppppppppppp811111111811111111811111111811111111PPPPPPPPPPPPPPPPRNBQKBNRRNBQKBNR

Answer 1

您需要将结果保存在数组中，以便用新值替换旧值，您通过对现有字符串调用替换来生成新字符串，并且不会将新字符串分配给对象引用。

 String[] read2 = new String[] {"rnbqkbnr", "pppppppp", "8", "8", "8", "8", "PPPPPPPP", "RNBQKBNR"};

for (int i = 0; i < 8; i++ ) {

    System.out.println(read2[i]);
    read2[i] = read2[i].replace("8", "11111111");
    read2[i] = read2[i].replace("7", "1111111");
    read2[i] = read2[i].replace("6", "111111");
    read2[i] = read2[i].replace("5", "11111");
    read2[i] = read2[i].replace("4", "1111");
    read2[i] = read2[i].replace("3", "111");
    read2[i] = read2[i].replace("2", "11");
    System.out.println(read2[i]);

}

编辑:正如评论中建议的那样，使用replace而不是replaceAll，因为replaceAll用于正则表达式。