Java编写服务器，有个问题

Question

错误显示，无法实例化，怎么解

Answer 1

        DataInputStream  in = new DataInputStream(new FileInputStream(new File("文件路径")));

还有别导错包

 import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;

如果还有错误就把错误贴上来，你贴代码又不知道错误是啥