deleting spaces !!

[young developer]

Hello everybody,
I was writing a code in java that allows to deleting superfluous spaces from a string.
The problem is that the system refuses this instruction :
ch.charAt(i)=ch.charAt(i+1);
where ch is the string.
how can i replace this instruction ??

[Tolls]

What is the error you are getting?

[young developer]

The left-hand side of an assignment must be a variable

[Tolls]

There you go then.

And, to save you some trouble looking for a setCharAt() method, Strings are immutable...that is they cannot be changed.

StringBuilder might help there.

[young developer]

thanks a lot Tolls :)
the code is right now ;)
here is my code :
public class main2 {
public static void main(String[] args) {

// delete extra spaces
StringBuffer ch=new StringBuffer(100);
int i =0;
ch.append(" g d ");
if (ch.charAt( 0)==' ')

ch.deleteCharAt(0);
if(ch.charAt(ch.length()-1)==' ')
ch.deleteCharAt(ch.length()-1);

while (i<ch.length()-1)
{
if ((ch.charAt(i)==' ')&&(ch.charAt(i+1)==' '))
{

ch.deleteCharAt(i+1);

}
else
i++;
}

System.out.println(ch);
}

}

[Petr]

You can use RegExp.

String text = "Hello world";
text = text.replaceAll("\\s+", "");

[young developer]

text = text.replaceAll("\\s+", "");
\\s+ -->what do you mean Petr ??

[Petr]

That is RegExp. see Pattern (Java 2 Platform SE v1.4.2)