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| Doubts regarding Hashtable |
Expert:Sylvia
Hi,
I am new to hashtable.Is it possible to create a hashtable like this?
java.util.Hashtable hashtable=new java.util.Hashtable();
hashtable.put(new RowObject("100","100"),new RowDetails(12,13,10,1));
since we get the key of hashtable from the database.
When I tried to retrieve using hashtable.get(new RowObject("100","100"));
a null pointer exception is occuring.
Kindly reply for this
thanks
Sylvia |
| Answers |
Hi friend,
new RowObject("100","100")
if your is constructor then a constructor is no return any value. so your example is occuring a null pointer exception.
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Read for more information,
http://www.roseindia.net/java/example/java/util/
Thanks.
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