I have a programming assignment and part of it requires me to make code that reads a line from the user and removes all the white space within that line. the line can consist of one word or more.
What I was trying to do with this program is have it analyze each character until it finds a space and then save that substring as the first token. then loop again until it reaches no more tokens or the end of the line.
I keep on getting this when I try to compile it:
Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 1
at java.lang.String.charAt(String.java:694)
at trim.main(trim.java:23)
Here is the code
import java.util.Scanner ;
import java.lang.Character;
import java.lang.String ;
public class trim
{
public static void main (String[]args)
{
String a ;
String b ;
String c ;
char aChar ;
int i = 0 ;
Scanner scan = new Scanner(System.in);
a = scan.nextLine();
a =a.trim() ;
for ( ; i >= 0 ; i++ )
{
aChar = a.charAt(i) ;
if (aChar != 32)
{
a = a.substring(0,i+1);
}
else
{
b = a.substring(i,160) ;
b= b.trim();
c = c + a ;
c = c.trim() ;
a = b ;
i = 0 ;
}
if (b.equals(null))
{
i = -1 ;
}
}
}
}
easier ways to do this is appreciated, but I still want to get this program working.
and I can't use sentinels in the input.
Thanks everybody for all the help,
I will use the simpler method , and will read the javadoc.
java.lang.String
class has method substring
not substr
, thats the error in your program.
Moreover you can do this in one single line if you are ok in using regular expression.
a.replaceAll("\\s+","");