PrintWriter class

[nitin pokhriyal]

hi,

Can anybody tell me the usuage of PrintWriter. I was trying example of K&B. Actually i am bit confused. So Help me out.. Thanks in Advance


Cheers,
Nitin

[Deepak Bala]

The PrintWriter class has functions like print() println() that can be used to write into a file. With a FileWriter you get the conventional read() write() functions

[nitin pokhriyal]

Thanks john for your reply but the below code doesnt working for me.
according to me it shd write "owdy folks" but it is not.. i m not able to trace the problem. i thought my understanding for printWriter is not correct.

import java.io.*;
class Writer3
{
public static void main(String[] args)
{
try{
File file=new File("testnitintxt.txt");
//FileWriter fw=new FileWriter(file);

PrintWriter pw=new PrintWriter(file);
pw.println("howdy");
pw.println("folks");
pw.write("howdy");
pw.write("folks");
}
catch(IOException e){}
}
}


Regards,
nitn

[Deepak Bala]

Always flush the toilet

 
import java.io.*;
class test 
{
public static void main( String args[] )
{
try
{
File file=new File("testnitintxt.txt");
PrintWriter pw=new PrintWriter(file);
pw.println("howdy");
pw.println("folks");
pw.write("howdy");
pw.write("folks");
pw.flush();
pw.close();
}
catch(IOException e)
{
 
}
}
}
 

[nitin pokhriyal]

thanks john . i got u.

but another stupid question flush() is to free the resources but without using flush it shd write the content to text file isn't it? please clarify and thanks alot for ur prompt reply.


regards,
nitin

[Deepak Bala]

Oh yes it should. Well some times it does and some times it does not. I remember another thread quite sometime back in the "java in general intermediate" forum. A program read around 80k lines but it only wrote 79.8k lines back into a file because the stream was not flushed. Just remember that before the stream is closed you should always flush the buffer.

[nitin pokhriyal]

Thanks alot john, you are wonderful. you flushed my doubts.

Regards,
nitin

[Vijay Raj]

If we close the stream, doesn't it automatically flush it before closing?

regards,
vijay.

[Asha Pathik]

If the stream would have done the flushing we wouldn't have 'flush method' in IO classes.