String Methods Help Please~```

Question

Hi, I have a question that goes like this:
Write a Java class called KillWhiteSpace, which defines a main() method that asks the user to enter a String s, and displays a new String consisting of all the characters in s, but with the leading and trailing white space removed. In addition, every sequence of spaces within the String is reduced to one space only. You MUST NOT use any methods defined in the String class other than charAt() and length().
So far, I wrote
import java.until.Scanner;
public class KillWhiteSpace{
public static void main(String args[]){
System.out.println("Please enter a bunch of texts");
Scanner keyboard=new Scanner(System.in);
String w=keyboard.nextLine();
Now I know what charAt() and length() does but I don't know how to use it to satisfy the requirements above. Any helps?
Edited by: Lillian_Cao on Oct 20, 2008 8:17 PM

Answer 1

I don't want to give you too much since this is clearly an educational exercise, but to get you going, it looks like you you want to iterate over all the characters in the string, analyze each one, keeping track of previous characters and construct your new string as you go.
Good luck and have fun.