如何在Java中将char值添加到char数组

如何解决如何在Java中将char值添加到char数组

我正在尝试将char的补数结果放入char数组互补1中。我以为我可以使用运算符，但这仅适用于字符串，但是我很难弄清楚如何将每个字母放入数组中以便可以显示结果。任何帮助都将非常感谢。

    public static char[] complement(char[] dna) {
        
        char[] complement1 = new char[17];
        
        char comp = '\0';
        
        for (char i = 0; i < dna.length; i++)
            if (dna[i] == 'A') {
                comp = 'T';
            } else if (dna[i] == 'T') {
                comp = 'A';
            } else if (dna[i] == 'G') {
                comp = 'C';
            } else if (dna[i] == 'C') {
                comp = 'G';
                
            } else {
                return null;
            }
        
        for (char c : dna)
            return complement1;
        return complement1;
        
    }
    
    public static void main(String[] args) {
        String testData1 = "GCCTGTCGTAGCTTATC",testData2 = "GGCTGACGTAGCGTAAC";
        System.out.printf("%s <-- complement --> %s%n",testData1,complement(testData1));
        // int[] baseCounts = nucleotideCounts(testData1);
        // System.out.printf("Nucleotide counts for %s: A: %d C: %d G: %d T: %d%n",// testData1,baseCounts[0],// baseCounts[1],baseCounts[2],baseCounts[3]);
        
        System.out.printf("%s <-- reverse complement --> %s%n",reverseComplement(testData1));
        System.out.printf("%s GC-content: %f%n",gcContent(testData1));
        System.out.printf("Hamming distance between %s and %s: %d%n",testData2,hammingDistance(testData1,testData2));
        // System.out.printf("Mutation points between %s and %s:%n%s%n",// testData2,// Arrays.toString(mutationPoints(testData1,testData2))); */
    }
}

解决方法

可以使用switch语句来映射核苷酸来简化代码。

另外，complement的长度被固定为与输入dna的长度相同，如果输入无效，则抛出运行时异常。

public static String complement(String dna) {
    
    final int n = dna.length();
    char[] complement = new char[n];
        
    for (int i = 0; i < n; i++) {
        char comp = '\0';
        switch (dna.charAt(i)) {
            case 'A': comp = 'T'; break;
            case 'T': comp = 'A'; break;
            case 'G': comp = 'C'; break;
            case 'C': comp = 'G'; break;
            default:
                throw new IllegalArgumentException("Invalid nucleotide detected at " + i + ": " + dna.charAt(i) + " in DNA: " + dna);
        }
        complement[i] = comp;
    }
    return new String(complement);
}

测试

String testData1 = "GCCTGTCGTAGCTTATC",testData2 = "GGCTGACGTAGCGTAAC";
System.out.printf("%s <-- complement --> %s%n",testData1,complement(testData1));
System.out.printf("%s <-- complement --> %s%n",testData2,complement(testData2));

输出：

GCCTGTCGTAGCTTATC <-- complement --> CGGACAGCATCGAATAG
GGCTGACGTAGCGTAAC <-- complement --> CCGACTGCATCGCATTG