public FileWriter(String name); //根据文件名创建一个可写入的输出流对象
  public FileWriter(String name,Boolean a); //a 为真，数据将追加在文件后面

import java.io.*;
class ep10_3{
  public static void main(String args[]){
    try{
      FileWriter a=new FileWriter("ep10_3.txt");
      for(int i=32;i<126;i++){
        a.write(i);
      }
      a.close();
    }
    catch(IOException e){}
  }
}

!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_`abcdefghijklmnopqrstuvwxyz{|}

  public BufferedWriter(Writer out); //创建缓冲区字符输出流
  public BufferedWriter(Writer out,int size); //创建输出流并设置缓冲区大小

import java.io.*;
class ep10_4{
  public static void main(String args[]){
    String str=new String();
    try{
      BufferedReader in=new
      BufferedReader(new FileReader("ep10_4_a.txt"));
      BufferedWriter out=new
      BufferedWriter(new FileWriter("ep10_4_b.txt"));
      while((str=in.readLine())!=null){
        System.out.println(str);
        out.write(str); //将读取到的 1 行数据写入输出流
        out.newLine(); //写入换行符
      }
      out.flush();
      in.close();
      out.close();
    }
    catch(IOException e){
      System.out.println("出现错误"+e);
    }
  }
}