Java 文件不从头开始读取

Question

我有一个包含以下输入的文件:

ADD 1 2
SUB 2 1
MUL 2 3
DIV 4 2
QUIT

这部分代码:

BufferedReader in = null;
String input = "";
in = new BufferedReader(fin);
while ((input = in.readLine()) != null)
{
    String line = in.readLine();    
    System.out.println(line); // for me to see the output
    out.println(line); // thats for my server
    out.flush(); // for the server
}

但它只显示:

MUL 2 3
DIV 4 2 
null

Answer 1

试试这个:

BufferedReader in = null;
String input = "";
in = new BufferedReader(fin);
while ((input = in.readLine()) != null)
{
    System.out.println(input); // for me to see the output
    out.println(input); // thats for my server
    out.flush(); // for the server
}

您从文件中读取输入两次，一次在 while 语句中，一次在 while 语句之后。