import java.io.*;

public class Example10_6 {

   public static void main(String args[]) {

      File sourceFile = new File("a.txt");  //读取的文件

      File targetFile = new File("b.txt");  //写入的文件

      char c[] =new char[19];               //char型数组

      try{

         Writer out = new FileWriter(targetFile,true); //指向目的地的输出流

         Reader in  = new FileReader(sourceFile);   //指向源的输入流

         int n = -1;

         while((n=in.read(c))!=-1) {

             out.write(c,0,n);

         }

         out.flush();

         out.close();

      }

      catch(IOException e) {

          System.out.println("Error "+e);

      }

  }

}