java-方法未通過測驗

我正在努力使用一種沒有通過測驗的方法。我正在做類似凱撒密碼的事情，我不知道是正則運算式（我不這么認為）還是其他任何問題。

這是代碼：

public String code(String text, int distance){

        if (distance <0){           
            return null;
        }

        StringBuilder result = new StringBuilder();
        for (char character : text.toCharArray()) {
            Pattern pat = Pattern.compile ("^[a-zA-Z\\.]$");      
            Matcher mat = pat.matcher(text);

            if (mat.matches()) {              
                character = Character.toLowerCase(character);           
                int originalAlphabetPosition = character - 'a';
                int newAlphabetPosition = (originalAlphabetPosition   distance) % 26;           
                char newCharacter = (char) ('a'   newAlphabetPosition);             
                result.append(newCharacter);
            } else {
                result.append(character);                          
            }
        }
        return result.toString();
    }

這是測驗

 assertEquals("bgig.fuurumoiu", pac2Ex4.code("vaca.zoologico", 6));

這是錯誤

Expected :bgig.fuurumoiu
Actual   :vaca.zoologico

完成的其他測驗

void testCode() {
        assertEquals("b", pac2Ex4.code("a", 1));
        assertEquals("d", pac2Ex4.code("a", 3));
        assertEquals("-", pac2Ex4.code("-", 3));
        assertEquals("z", pac2Ex4.code("x", 2));
        assertEquals("a", pac2Ex4.code("x", 3));

        assertEquals("b", pac2Ex4.code("a", 27));
        assertEquals("d", pac2Ex4.code("a", 29));
        assertEquals("x", pac2Ex4.code("x", 26));
        assertEquals("x", pac2Ex4.code("x", 0));

        assertNull( pac2Ex4.code("x", -1));

        assertEquals("bgig.fuurumoiu", pac2Ex4.code("vaca.zoologico", 6));
        assertEquals("bgig.fuurumoiu", pac2Ex4.code("vaca.zoologico", 32));
        assertEquals("afhf ettqtlnht", pac2Ex4.code("vaca zoologico", 31));

        assertEquals("wdap bjcsd! 2020", pac2Ex4.code("hola mundo! 2020", 15));
        assertEquals("wdap bjcsd! 2020", pac2Ex4.code("hola mundo! 2020", 41));
        assertEquals("wdap bjcsd! 2020", pac2Ex4.code("hola mundo! 2020", 67));
    }

我哪里做錯了？一定是條件不好，這一定是由正則運算式引起的。但是，我找不到錯誤。我在https://regex101.com/ 中測驗了我的正則運算式并且它有效。

先感謝您！

uj5u.com熱心網友回復：

您的正則運算式在 regex101 中不起作用

嘗試 \w*\.\w*

但是您的邏輯仍然會導致bgigNfuurumoiu，因此更改為

    if (distance <0){           
        return null;
    }

    Pattern pat = Pattern.compile ("\\w*\\.\\w*");      
    Matcher mat = pat.matcher(text);
    if (!mat.matches()) {     
        System.out.println("No Match");
        return text;
    }
    StringBuilder result = new StringBuilder();
    for (char character : text.toCharArray()) {

        if (character == '.') {
            result.append(character);
            continue;
        }
        character = Character.toLowerCase(character);           
        int originalAlphabetPosition = character - 'a';
        int newAlphabetPosition = (originalAlphabetPosition   distance) % 26;           
        char newCharacter = (char) ('a'   newAlphabetPosition);             
        result.append(newCharacter);
    }
    return result.toString();

編輯

取消正則運算式

    if (distance <0){           
        return null;
    }

    StringBuilder result = new StringBuilder();
    for (char character : text.toCharArray()) {

        if (!Character.isAlphabetic(character)) {
            result.append(character);
            continue;
        }
        character = Character.toLowerCase(character);           
        int originalAlphabetPosition = character - 'a';
        int newAlphabetPosition = (originalAlphabetPosition   distance) % 26;           
        char newCharacter = (char) ('a'   newAlphabetPosition);             
        result.append(newCharacter);
    }
    return result.toString();

標籤：爪哇

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