java - 在 Java 中，我如何使用这个 countLines 方法来计算没有换行符的行？

Question

以下代码计算文本文件中的行数，但如果有一行没有换行符 ('\n')，则不会计算它们:

public static int countLines(String filename) throws IOException {
    InputStream is = new BufferedInputStream(new FileInputStream(filename));


try {
    byte[] c = new byte[1024];
    int count = 0;
    int readChars = 0;
    boolean empty = true;
    while ((readChars = is.read(c)) != -1) {
        empty = false;
        for (int i = 0; i < readChars; ++i) {
            if (c[i] == '\n'   /*  || c[i] != null  */ ) {
                ++count;
            }
        }
    }
    return (count == 0 && !empty) ? 1 : count;
} finally {
    is.close();
}

当我尝试将代码 c[i] != null 添加到 if 条件中时，它给出了这个错误:

NewParentClass.java:72: error: incomparable types: byte and ''

    if (c[i] == '\n'    || c[i] != null  ) {

Answer 1

BufferedReader reader = new BufferedReader(new FileReader("file.txt"));
int lines = 0;
while (reader.readLine() != null) lines++;
reader.close();