package Suchas; import java.io.*;public class FileIO {    public FileIO(String str)     {         File f = new File("data.txt");         try          {             File file = new File("data.txt");             FileWriter fw = new FileWriter(file);             BufferedWriter bw = new BufferedWriter(fw);            bw.write(str);             bw.close();         } catch (IOException e)         {            e.printStackTrace();        }    }    public static void main(String[] args)     {         String str = "12345abcdef@#%&*软件工程";         new File(str);      }  }

package Suchas; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; public class Filedemo {     public Filedemo()     {         File f = new File("data.txt");             try {                 BufferedReader br = new BufferedReader(new FileReader(f));                String str = br.readLine();                 System.out.println(str);                 br.close();            } catch (FileNotFoundException e)              {                 e.printStackTrace();             } catch (IOException e)              {                 e.printStackTrace();             }         }     public static void main(String[] args)      {         new Filedemo();      }  }