import java.io.*;enum D{D;System z;int c;{try{for(Reader r=new FileReader("f");;)z.out.printf("%c",r.read());}catch(Exception e){try{for(Writer w=new FileWriter("f");(c=z.in.read())>0;w.flush())w.write(c);}catch(Exception x){}}}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).