1190. Reverse Substrings Between Each Pair of Parentheses

class Solution {
    public String reverseParentheses(String s) {
        StringBuilder resultstr = new StringBuilder(s);
        int startindex = resultstr.lastIndexOf("(");
        int endindex = resultstr.indexOf(")",startindex);

        while(startindex!=-1){
            StringBuilder sb = new StringBuilder(resultstr.substring(startindex+1, endindex));
            sb.reverse();
            resultstr.replace(startindex, endindex+1, sb.toString());
            startindex = resultstr.lastIndexOf("(");
            endindex = resultstr.indexOf(")", startindex);

        }
       return resultstr.toString();

    }
}