char to integer conversion

[satellite03]

hi ,

i think a sigle character is the smallest string.

but when i wrote to convert this charater to integer it gave me error.

i wrote

import java.io.*;

class ReadFileExample
{

public static void main( String args[]) throws IOException
{	
char oneByte;	
File f = new File ("d:\\data.txt");	
FileInputStream fis = new FileInputStream (f) ;
oneByte = (char) fis.read();

int n	= Integer.parseInt(oneByte);

System.out.println("integer =" + n );
fis.close();

}


}

although parseInt() demands a string , but a single character is also can be treated as a string. right?

then why it could not convert the character into integer??

my file
--------
400 25.81
600 33.82
800 40.94
1000 51.62

compilation erroe
-----------------
javac ReadFileExample.java
ReadFileExample.java:13: cannot resolve symbol
symbol : method parseInt (char)
location: class java.lang.Integer
int n = Integer.parseInt(oneByte);
^
1 error
>Exit code: 1

whats wrong with this???

is there any atoi() function (as in C ) in java which can convert char to int????

i have no problem to extract the integer but i was intentionally trying to convert the char into integer by using methods. why i failed???

 

[ryder14]

The problem you are running into is that Java has the primitive variable type char and an object reference variable type String. The Integer.parseInt() will work with a string of any length but not a char, so cast oneByte to a String instead of a char and this should work.

 

[satellite03]

ok....you are telling to cast into string!!...but string is an object reference ....did you mean

 int n= Integer.parseInt((String)oneByte);

-->error


or did you mean

....
.....
String oneByte;
..............
oneByte = (String) fis.read();

int n    = Integer.parseInt(oneByte);

this is also giving error....

 

[ryder14]

The rough work around would be to use your original cast to a char and add a line that recasts the char to another variable of the type String.

oneByte = (char)fis.read();

strOneByte = (String)oneByte;

 

[byam]

I don't think you can cast a primitive type to Object.

I would do the following:

oneByte = (char)fis.read();
strOneByte = String.valueOf(oneByte);
int n    = Integer.parseInt(strOneByte);

If you just want to get the integer from a char, a simpler more efficient way would be:

oneByte = (char)fis.read();
int n    = oneByte - '0';

 

[satellite03]

r u getting the result? as you have suggested i wrote like that ....but it is saying "inconvertible types"...error..

 

[byam]

can I see your code?

 

[satellite03]

To byam
--------
it was not pointing to you... it was to ryder14.
i did not see your post while posting...probabily mine and yours post has gone simultaneously..

anyway,

i run your code
and
yes, your code is working perfectly.

thanks