import java.io.*;
class Test893{
public static void main(String[] args)throws Exception{
DataInputStream dis = new DataInputStream(System.in);
String S = dis.readUTF();
System.out.println(S);
}
}
为什么会没有输出，而把
DataInputStream dis = new DataInputStream(System.in);
String S = dis.readUTF();
换成
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String S = br.readLine();
以后又有输出了