I/O doubt

[Alan Hermin]

HI ALL....
i am preparing for scjp5 using k&b....
Page 439-chapter 6......he said that the actual file does not created unless you call File.craeteNewFile(), create Reader or Write classes BUT:
when you do that:
try{
File f=new File("myFile.txt");
FileReader fr=new FileReader(f);
}catch(Exception ex1){ex1.printStackTrace();}
Then THERE ARE EXCEPTION : java.io.FileNotFoundException
AND no files created.........

[Kristian Perkins]

Yes it is an error in the book, InputStreams and Readers do not create files, and is noted here in the errata: temporary K&B 5 errata

Kristian

[Edisandro Bessa]

So Kristian do you mean only FileWriter creates a new file if no such file exists ?

[Deepak Bala]

Both FileWriter and PrintWriter exhibit that behaviour. If no file exists then a new file is created.

[Edisandro Bessa]

Huuumm. Thanks John for your prompt reply. I will not forget it !

[Changchun Wang]

more about it
also FileOutputStream and Formatter will creates files if no such file exists.
so for preparing the exam,PrintWriter,FileWriter,FileInputStream,Formatter will creaate files if no such files exists
[ April 16, 2006: Message edited by: Changchun Wang ]

[Edisandro Bessa]

Thank U Changchun.

[Alan Hermin]

hey Changchun Wang.....

so for preparing the exam,PrintWriter,FileWriter,FileInputStream,Formatter will creaate files if no such files exists

NO...FileInputStream does not create one if does not exist...