public static void main(String[] args)  {        try {            BufferedReader in = new BufferedReader(new FileReader("wangaw.txt"));            String str;            while ((str = in.readLine()) != null) {                System.out.PRintln(str);            }            System.out.println(str);        } catch (IOException e) {        }    }

讀取文件的內容

in.readLine()整行的讀取，當讀到為空的時候停止