Collections (LinkedHashMap)

[adrian mills]

Hi All,
Thanks in advance.

I am having some values stored in a linked hash map.
They are in the form of Key value pair.But since I had to maitain their order also I used a LinkedHashMap.

My problem is that while iterating I have to remove a particular value fromt the linkedhashmap.
For eg:

the linked hashmap contains the following values:--

("Am",1);
("Pm",2);
("Cm",3);
("Dm",4);

Now suppose I remove Pm.
Then the new hashmap should be formed in the following manner
("Am",1);
("Cm",2);
("Dm",3);

Can someone suggest me how to do this.
I tried iterating and removing and putting the value again in the linkedhashmap.but it gives a Concurrent modification exception.

Thanks a lot for all your help

[Arjun Shastry]

Are you trying to do this or am I wrong somehere? following code is not giving any error

 
LinkedHashMap  map = new LinkedHashMap();
map.put("Am","1");
map.put("Pm","2");
map.put("Cm","3");
map.put("Dm","4");
Collection valCollect =  map.values();
Iterator it = valCollect.iterator();
System.out.println("Initially");
while(it.hasNext())
System.out.println(it.next().toString());
 
//Removing Pm
map.remove("Pm");
Iterator itNext = valCollect.iterator();
while(itNext.hasNext())
   System.out.println(itNext.next().toString());
 
//put it again
map.put("Pm","2");
Iterator itr = valCollect.iterator();
while(itr.hasNext())
     System.out.println(itr.next().toString());
 

[pascal betz]

hi

it looks like your value is just the index ?
then use a List instead of Map. The index of your objects would be the same as your values in the Map.

some pseudocode:

 
// list =>
list 0 -> "Am" // index 0
list 1 -> "Pm" // index 1
list 2 -> "Cm" // index 2
list 3 -> "Dm" // index 3
....
list.remove("Cm");
....
// list 
list 0 -> "Am" // index 0
list 1 -> "Pm" // index 1
list 2 -> "Dm" // index 2
 
 

pascal