java 更改list 某一元素？

if(!elTd.getElementsByTag("p").isEmpty()){
        int i=eduList.size();
        if(i>0){
         eduList.set(i-1, (String)eduList.get(i-1)+"<>"+elTd.getElementsByTag("p").text());
        }
        continue a;
       }
       sb.append("<>"+elTd.text());