7.5java IO

import java.io.*;
 
 public class ccc {
 
     public static void main(String[] args) throws IOException{
         String str="12345abcde@#%&*软件工程";
         File file=new File("d:\\tset.txt");
         file.createNewFile();
         FileInputStream fr=new FileInputStream(file);
         FileOutputStream fw=new FileOutputStream(file);
         byte[]bw=str.getBytes();
         fw.write(bw);
         byte[]br=str.getBytes();
         fr.read(br);
         String str$=new String(br);
         System.out.println(str$);
         fr.close();
         fw.close();
     }
 
 }