使用BufferedReader读取所有行

阅读所有行的惯用方式是

while ((line = buffer.readLine()) != null)

try-with-resources

try (InputStreamReader instream = new InputStreamReader(System.in);        BufferedReader buffer = new BufferedReader(instream)) {    long length = 0;    String line;    while ((line = buffer.readLine()) != null) {        length += line.length();    }    System.out.println("Read length: " + length);} catch (Exception e) {    e.printStackTrace();}

如果你想，当你收到一个空行来结束循环，在添加一个测试为

while

while ((line = buffer.readLine()) != null) {    if (line.isEmpty()) {        break;    }    length += line.length();}

JLS-14.15。该

break

一条

break

语句将控制权从一个封闭的语句中移出。