大神啊，请问。为什么输出的是问号啊？

import java.io.*;

class FileInOutEx{

public static void main(String[] args) throws IOException{

File file_Book1 = new File("Book1.txt");

String bookInfo = "世界是平的\t 350.0\t Friedman\t";

file_Book1.createNewFile();

FileOutputStream fos = new FileOutputStream(file_Book1);

fos.write(bookInfo.getBytes());

fos.close();

FileInputStream fis = new FileInputStream(file_Book1);

System.out.println("书籍名称\t 价格\t 作者\t");

System.out.println("---------------------------------------");

int i = 0;

while((i=fis.read()) != -1)

System.out.print((char)i);

fis.close();

}

qq_童化金_dwxHIS

2019-03-12

源自：Java入门第三季 5-4

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1 回答

慕雪0332877
2019-03-26

package com.imooc;

import java.io.File;
import java.io.*;

public class FileInOutEx {

public static void main(String[] args) throws IOException{

File file_Book1 = new File("Book1.txt");

byte[] bookInfo = "世界是好的\t 350.0\t Friedman\t".getBytes();

file_Book1.createNewFile();

FileOutputStream fos = new FileOutputStream(file_Book1);

fos.write(bookInfo);

fos.close();

FileInputStream fis = new FileInputStream(file_Book1);

byte[] byt = new byte[1024];

System.out.println("书籍名称\t 价格\t 作者\t");

System.out.println("---------------------------------------");

int i = fis.read(byt);

System.out.print(new String(byt,0,i));

fis.close();

}
}