Iterating the HashMap in JSP using strut2

Question

Iterator<Entry<String, HashMap<String, List<String>>>> 
iter=cellLinesList.entrySet().iterator();

    while(iter.hasNext()){
        Entry en=iter.next();
        System.out.println("The bay is ................"+en.getKey());
        HashMap<String,List<String>> rowList=(HashMap<String, List<String>>) en.getValue();
        Iterator<Entry<String, List<String>>> rowIter=rowList.entrySet().iterator();
        while(rowIter.hasNext()){
            Entry rowEn=rowIter.next();
            System.out.println("The row is ..................."+rowEn.getKey());
            List<String> cellsList=(List<String>) rowEn.getValue();
            for(String s:cellsList){
                System.out.println(s);
            }
        }
    }

Here I am unable to iterator this type of the Hashmap,Please help me

Thanks in advance

score 0 · Answer 1 · edited May 23 '17 at 10:33

Traversing these structures is generally easier in JSP than in Java, thanks to iterators doing most of the job for you.

For example, this answer explains exactly how to iterate the structure:

HashMap<String,<ArrayList<String>>>

By the way, in some cases the (lack of) design reaches a point where a refactoring is higly suggested.

This:

Iterator<Entry<String, HashMap<String, List<String>>>>

is quite a nightmare to handle; try creating some objects like described in this other answer.

Iterating the HashMap in JSP using strut2

1 Answers1