- import java.io.*;
- import java.util.*;
- public class demo
- {
- public static void main(String[] agrs) throws IOException
- {
- FileWriter fw = new FileWriter("1.txt");
- fw.write(65);
- fw.write(66);
- fw.write((-1));
- fw.write(67);
- fw.close();
- FileReader fr = new FileReader("1.txt");
- int i = 0;
- while((i=fr.read()) != -1)
- {
- System.out.println(i+"::"+(char)i);
- }
- fr.close();
- }
- }
复制代码 -1写进去显示?,读取出来也是问号,不过变成63了,估计文本中不存在-1的符号 |