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Creating a Copy of a Collection

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In this section, you will learn how to create and then copy the collection.

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);
  }
}

Download this example.

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Posted on: April 16, 2007

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