Accessing values inside ArrayList individually in JSP

Question

In my servlet I have the following. All four are ArrayList<>, each with 5 values.

    request.setAttribute("interestEarnList", interestEarnList);
    request.setAttribute("numYear", numYear);
    request.setAttribute("endBalanceList", endBalanceList);
    request.setAttribute("startBalanceList", startBalanceList);

I want to display them on jsp file in the form of:

Year Number: ${numYear}, 
Beginning Balance of this year is: ${startBalanceList},
Ending Balance of this year is: ${endBalanceList},
Total interest earned this year: ${interestEarnList},

And loop this based on the size of numYear arrayList.

I have tried forEach but unfortnately it will display all numYear values, then all startBalanceList values, and so on.

Both of these talk about what you want to do but they only use two lists so you need to expand that to four for your case: http://stackoverflow.com/questions/31963297/how-to-zip-two-arraylists http://stackoverflow.com/questions/3833814/java-how-to-write-a-zip-function-what-should-be-the-return-type — Jerry Jeremiah, Mar 08 '17 at 04:51
What about http://stackoverflow.com/questions/2118932/is-there-an-accepted-java-equivalent-to-pythons-zip or http://stackoverflow.com/questions/1365793/how-to-most-elegantly-iterate-through-parallel-collections — Jerry Jeremiah, Mar 08 '17 at 04:53

score 2 · Accepted Answer · answered Mar 08 '17 at 06:28

Here is a demonstration.

<%@ page import="java.util.*" %>
<%@ taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>
<%
    request.setAttribute("interestEarnList", Arrays.asList(11,22,33,44,55));
    request.setAttribute("numYear", Arrays.asList(1,2,3,4,5));
    request.setAttribute("endBalanceList", Arrays.asList(122,244,366,488,610));
    request.setAttribute("startBalanceList", Arrays.asList(111,222,333,444,555));
%>
    <c:forEach var="year" items="${numYear}" varStatus="status">
        Year Number: ${year}, <br/>
        Beginning Balance of this year is: ${startBalanceList[status.index]},<br/>
        Ending Balance of this year is: ${endBalanceList[status.index]},<br/>
        Total interest earned this year: ${interestEarnList[status.index]}<br/>
    </c:forEach>

With that dummy data, the output is

Year Number: 1, 
Beginning Balance of this year is: 111,
Ending Balance of this year is: 122,
Total interest earned this year: 11
Year Number: 2, 
Beginning Balance of this year is: 222,
Ending Balance of this year is: 244,
Total interest earned this year: 22
Year Number: 3, 
Beginning Balance of this year is: 333,
Ending Balance of this year is: 366,
Total interest earned this year: 33
Year Number: 4, 
Beginning Balance of this year is: 444,
Ending Balance of this year is: 488,
Total interest earned this year: 44
Year Number: 5, 
Beginning Balance of this year is: 555,
Ending Balance of this year is: 610,
Total interest earned this year: 55

I found a way to do this by creating a DTO to store all the information then store them inside an ArrayList. But your way is awesome and easy to understand. Thanks for the answer. — FeCH, Mar 08 '17 at 14:44

Accessing values inside ArrayList individually in JSP

1 Answers1