Creating a Copy of a Collection
In this section, you will learn how to create and then
copy the collection. The copied collection contains the reference
to the object. In-fact, objects are not cloned.
The following program creates a collection (list) and
copy for the duplicate collection with content of that. The new copied
collection has the reference of the source collection. When you use the copied
collection for viewing contents of that then the copied collection referenced to
the source collection and views it's elements.
Code Description:
Here, in this example, a list is created and two string
"parisonz" and "roseindia.net" are assigned to the list with
the type checking which are the collection elements. And the created list is
copied by creating the new object of the ArrayList class. The collection
name (list name) is passed through the ArrayList() constructor as a
parameter which has to be copied (or referenced through the new duplicate
object).
Here is the code of the program:
import java.util.*;
public class CopyCollection{
public static void main(String[] args){
List<String> list = Arrays.asList(new String[]{"parisonz", "roseindia.net"});
System.out.println("Content of the original list : " + list);
List copiedList = new ArrayList<String>(list);
System.out.println("Content of the copied list : " + copiedList);
}
}
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