Java Array Name from the request parameter

Question

I have an array

String[] strArray= {"Milk","Bread,"eggs"};

and generally we can display the values as strArray[i] in a loop ... however I am getting the name of the array " StrArray" dynamically from a value of a request parameter &arrayName=strArray .

request.getParameter("arrayName");

Can one of you experts kindly advise how to construct the arrayname from the request and use it to display the values of the array.

You already know (and show) how to get the name from a parameter. Your best bet for accessing the array by dynamically-provided name is to store the array (and any others that you want to access that way) in a Map, with their names as keys. At runtime, retrieve them from the map. — John Bollinger
– John Bollinger, Commented Apr 12, 2017 at 15:39
based on request paramter I will have to display the values in my application , for example if the value of the request is strArray then will get the values displayed from strArray.. — lampstand
– lampstand, Commented Apr 12, 2017 at 15:39
If you're talking about doing this in a servlet / JSP, then you could consider storing the array as a request, session, or context attribute instead of in a Map. — John Bollinger
– John Bollinger, Commented Apr 12, 2017 at 15:40

Community · Accepted Answer · 2017-05-23 11:54:15Z

0

The easiest but unclean way would be a map:

Map<String, String[]> map = new HashMap<String, String[]>();
map.put("strArray", strArray);
map.get("strArray");

Probably better would be to use reflection. stackoverflow example

edited May 23, 2017 at 11:54

CommunityBot

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answered Apr 12, 2017 at 15:42

Dominik

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lampstand · Accepted Answer · 2017-04-13 14:47:42Z

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HashMap<String, String[]> strMap = new HashMap<String, String[]>();

strMap.put("strArray", new String[]{"Milk","Bread,"eggs"});

String strName[]=(String[])strMap.get(request.getParameter("strArray"));

response.write(strName[1]);

this works.

answered Apr 13, 2017 at 14:47

lampstand

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