Collections

[Cbani]

Hi,

I have this code

<code>
Map<Long, String> childFileMap = new HashMap<Long, String>();
childFileMap.put(new Long(1), "aaaaa");
childFileMap.put(new Long(2), "bbbbbb");
childFileMap.put(new Long(3), "ccccccccc");

Iterator childFileMapIterator = (childFileMap.keySet()).iterator();
while (childFileMapIterator.hasNext()) {

String jmsChildCorrelationId = childFileMapIterator.next().toString();
System.out.println("jmsChildCorrelationId========= =="+ jmsChildCorrelationId);

String childFileName = childFileMap.get(1);
System.out.println("childFileName===========" + childFileName);
}
</code>

I am not able to understand why this System.out.println("childFileName===========" + childFileName); prints null

[RamyaSivakanth]

Hi,
You have stored as Long object as key but you are trying to retreive with primitive long type.

so retreive like this

String childFileName = childFileMap.get(new Long(1));

[Cbani]

thanks Ramya :)

[JosAH]

Hi,
You have stored as Long object as key but you are trying to retreive with primitive long type.

so retreive like this

String childFileName = childFileMap.get(new Long(1));

That's not it; the OP supplied a simple '1' which is autoboxed to an Integer, and that's not in the list; change that '1' to '1L' and the key will be correctly autoboxed and found.

kind regards,

Jos