Input Output Stream in Java

Input Output Stream in Java

import java.io.*;
class IOTest
{
  public static void main(String[] arg) throws Exception
  {
    FileInputStream in=new FileInputStream("test.txt");
    FileOutputStream out=new FileOutputStream("out.txt");
    int c;
    String ch;
    do
    {
      c=in.read();
     
      out.write(c);
    }while(c!=-1);
    while((c=test.read()) !=-1)
    {
      ch.appand((char)ch);
     
    }
   
   
  System.out.println(ch);
   
   
   
    in.close();
    out.close();
  }
}