Java String remove from both side

//package com.demo2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String str = "mdemo2s.com";
        boolean left = true;
        boolean right = true;
        String what = "m";
        System.out.println(megastrip(str, left, right, what));
    }//from   www.  ja va 2  s.c om

    /**
     * This is a both way strip
     *
     * @param str the string to strip
     * @param left strip from left
     * @param right strip from right
     * @param what character(s) to strip
     * @return the stripped string
     */
    public static String megastrip(String str, boolean left, boolean right, String what) {
        if (str == null) {
            return null;
        }

        int limitLeft = 0;
        int limitRight = str.length() - 1;

        while (left && limitLeft <= limitRight && what.indexOf(str.charAt(limitLeft)) >= 0) {
            limitLeft++;
        }
        while (right && limitRight >= limitLeft && what.indexOf(str.charAt(limitRight)) >= 0) {
            limitRight--;
        }

        return str.substring(limitLeft, limitRight + 1);
    }
}