public static void demo_read() throws IOException{
FileInputStream fis=new FileInputStream("H://aa.txt");
BufferedInputStream bufis=new BufferedInputStream(fis);
FileOutputStream fos=new FileOutputStream("J://copya.txt");
BufferedOutputStream bufos=new BufferedOutputStream(fos);
Character ch=0;
while((ch=(char) bufis.read())!=-1){
bufos.write(ch);
}
bufos.close();
bufis.close();
}