用Java的特定数字值代替给定字母[副本]

Question

我想将一个字母作为字符串传递给这个方法，它应该返回相应的数字（作为字符串），该数字存储在与letterDispari数组中相同的索引中，但存储在numberDispari数组中。我以为使用字符串会比创建一个巨大的switch语句更容易。但我不明白为什么这不是归还任何东西。

private static String toNumberDispari2(String letter) {
        String result= "";
        String[] letterDispari = {"0","1","2","3","4","5","6","7","8","9",
                "A","B","C","D","E","F","G","H","I","J","K","L","M",
                "N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
        String[] numberDispari = {"1","0","5","7","9","13","15","17","19","21",
                "1","0","5","7","9","13","15","17","19","21",
                "2","4","18","20","11","3","6","8","12","14","16","10","22","25","24","23"};
        
        for(int i=0; i<=35; i++) {
            if (letter != letterDispari[i])
                continue;
            else if (letter == letterDispari[i])
                result = numberDispari[i];
        }
        return result;
    }

Answer 1

String是一个Java对象。不能使用“=”运算符检查两个不同的字符串对象是否具有相同的值。“=”检查对象引用，在这种情况下会有所不同。您需要使用下面的代码来进行值比较。

   for(int i=0; i<=35; i++) {
        if (!letter.equals(letterDispari[i]))
            continue;
        else if (letter.equals(letterDispari[i]))
            result = numberDispari[i];
    }