how to store map value in string array

[vijayakumar durai]

can anybody tell how to store map value in string array

  map=(HashMap)session.getAttribute("checkedvalue");
   String toId[]=new String[map.size()];
   Iterator it=map.entrySet().iterator();
   while(it.hasNext())
    {
      Map.Entry mvalue = (Map.Entry)it.next();
       toId=(String[])mvalue.getValue();  
     }

it will give class cast exception




thanks in advance

[vijayakumar durai]

how to convert map value to array?

[Bear Bibeault]

Please take the time to choose the correct forum for your posts. This forum is for questions on JSP.

For more information, please read this.

This post has been moved to a more appropriate forum.

[Ernest Friedman-Hill]

First, you're casting the contents of the map to the type "array of String." Are you sure the values in the Map are String arrays themselves, and not (for example) just Strings?

Secondly, you've allocated a String array which is appropriate for storing one String for each value in the map; then you're iterating over the map and trying to replace that array, over and over, with one extracted from the map. That's definitely not right.

If the values are Strings, and you're just trying to get them in an array, you might try something like

String[] toId = map.values().toArray(new String[map.size()]);

[vijayakumar durai]

i am storing the map value in arraylist

 
 for(int i=0;i<list1.size();i++)
  {
 map.put(list1.get(i),list1.get(i))
  }

can i able to convert into array?

[Neha Kathuriaa]

String toId[] = new String[map.size()];
Iterator it = map.entrySet().iterator();

while (it.hasNext()) {
Map.Entry mvalue = (Map.Entry) it.next();

        for (int i = 0; i < map.size(); i++) {
        toId[i] = (String) mvalue.getValue();
        System.out.println(toId[i]);
}
}
 } catch (ClassCastException e) {
System.out.println("Exception");
System.out.println(e.getMessage());
e.printStackTrace();
}
}

.Hop this is what you were looking for.
Reply please

[edit]Add code tags and delete excess whitespace. CR[/edit]
[ November 20, 2008: Message edited by: Campbell Ritchie ]

[Campbell Ritchie]

Thank you for the reply. Please always use the code button; it maintains indentation. I have edited your post so you can see how much easier it is to read.

I suspect your solution may not work, however. You will end up with an array full of the last value several times. There is however a simple way to correct that.

And please use System.err for printing Exception messages, not System.out.

[vijayakumar durai]

thanks neha :roll: its working fine