Granny's Programming Pearls
"inside of every large program is a small program struggling to get out"
JavaRanch.com/granny.jsp
The moose likes Java in General and the fly likes Cloning a Hashtable Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login


Win a copy of Murach's Java Servlets and JSP this week in the Servlets forum!
JavaRanch » Java Forums » Java » Java in General
Bookmark "Cloning a Hashtable" Watch "Cloning a Hashtable" New topic
Author

Cloning a Hashtable

bhuvan gupta
Greenhorn

Joined: Mar 26, 2001
Posts: 13

the java documentation says :
Hashtable.clone() Creates a shallow copy of this hashtable. The keys and values themselves are not cloned. This is a relatively expensive operation.
What do u mean by shallow copy ?? Is it just means creating a new reference of the object or something more ??
Frank Carver
Sheriff

Joined: Jan 07, 1999
Posts: 6920
A shallow copy in this case is a new hashtable, with one entry for each entry in the original hashtable, but the entries refer to the same keys and values as the original hashtable.
for example, consider this sequence:


Read about me at frankcarver.me ~ Raspberry Alpha Omega ~ Frank's Punchbarrel Blog
bhuvan gupta
Greenhorn

Joined: Mar 26, 2001
Posts: 13
Got the funda
Thank you very much Frank
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Cloning a Hashtable
 
Similar Threads
Cloneable interface!!
shallow copy vs deep copy?
shallow copy and deep copy
need your help about a cast about cloneable.!!!(jcjp07-Q119)
Question about clone a Hashtable