【单选题】下 列ABCD注释标注的哪行代码有错误? import java.io.*; public class Helo{ public static void main(String args[]) { File file = new File("hello. txt");// A long m = file.length();// B FileReader in = new FileReader(fi...
【单选题】下列ABCD注释标注的哪行代码有错误? import java.io.*; public class Helo { public static void main(String args[]) { File file = new File("hello. txt");// A long m = file.length();// B try { FileReader in = new FileRea...