> 用java写每次用到这Scanner cin = new Scanner(System.in)
> 测试的时候不知道怎么往进传参呀，求指教。
> 或者谁有其他方法亦可。


import java.util.*;
import java.io.*;
public class Main{
public static void main(String[] args) {
// TODO Auto-generated method stub

Scanner in = null;
try {
in = new Scanner(new FileInputStream("in.txt"));
} catch (Exception e) {
in = new Scanner(System.in);
}
while (in.hasNext()) {
......
}
}
}