Java 得到文件行数

Java读取文件的行数大体来说有两种方法，一种就是一行一行的读取，然后做count，代码如下：

public int count(String filename) throws IOException {      InputStream is = new BufferedInputStream(new FileInputStream(filename));      try {          byte[] c = new byte[1024];          int count = 0;          int readChars = 0;          while ((readChars = is.read(c)) != -1) {              for (int i = 0; i < readChars; ++i) {                  if (c[i] == '\n')                      ++count;              }          }          return count;      } finally {          is.close();      }  } 

另一种就是使用LineNumberReader类，但是使用这个类要得到全文的行数也得做个循环

public int countLines(String filename) throws IOException {      LineNumberReader reader  = new LineNumberReader(new FileReader(filename));  int cnt = 0;  String lineRead = "";  while ((lineRead = reader.readLine()) != null) {}    cnt = reader.getLineNumber();   reader.close();  return cnt;  }