code: public class Trims{
     public static String ltrim(String s){
        int i = 0;
        while (i < s.length() && Character.isWhitespace(s.charAt(i))){
           i++;
        }
        return s.substring(i);
     }
  
     public static String rtrim(String s){
        int i = s.length() - 1;
        while (i > 0 && Character.isWhitespace(s.charAt(i))){
           i--;
        }
        return s.substring(0, i + 1);
     }
  
     public static void main(String[] args){
        String s = " \t \r \n String with spaces  \t  \r  \n  ";
        System.out.println(ltrim(s));
        System.out.println(rtrim(s));
        System.out.println(s.trim()); //trims both ends
     }
  }
  