java如何将字符串的所有括号中指定字符替换掉？（正则表达式或者其它方法）

要处理字符串

Medical Care ( Costs Inverse ## agonism ( Costs Inverse ## agonism ) ) Costs ( Inverse ## agonism ) at beta_1 ##adrenergic receptors
替换操作：将字符串中 所有括号 内的 ##替换成 @
处理结果:
Medical Care ( Costs Inverse @ agonism ( Costs Inverse @ agonism ) ) Costs ( Inverse @ agonism ) at beta_1 ## adrenergic receptors
各路高手帮帮忙 （ 正则表达式或者其它方法都行的 ）

public static void main(String[] args) {
    String s = "Medical Care ( Costs Inverse ## agonism ( Costs Inverse ## agonism ) ) Costs ( Inverse ## agonism ) at beta_1 ##adrenergic receptors";
    String returnValue = "";
    String [] str =   s.split("\\)");

    for (int i = 0; i < str.length; i++) {
        if(" ".equals(str[i])){
            str[i] = ")";
        }

        if(str[i].contains("(")){
            str[i] = str[i].replaceAll("##", "@@")+")";
        }
    }

    s = ArrayUtils.toString(str).replace(",", " ");
    returnValue = s.substring(1, s.length()-1);
   System.out.println(returnValue);
}