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Java ArrayList Copy

Submitted by Sameera on Fri, 11/12/2010 - 19:53

import java.util.ArrayList;
import java.util.Collections;
 
//Java ArrayList Copy
 
/*
 * This Java ArrayList copy example shows how to copy one ArrayList
 * to another using copy method of Collections class.
 */
public class JavaArrayListCopy {
    
    public static void main(String args[]){
       
        ArrayList<String> alistNumbers = new ArrayList<String>();
        alistNumbers.add("1");
        alistNumbers.add("2");
        alistNumbers.add("3");
       
        ArrayList<String> alistNumbersInWords = new ArrayList<String>();
        alistNumbersInWords.add("One");
        alistNumbersInWords.add("Two");
        alistNumbersInWords.add("Three");
        alistNumbersInWords.add("Four");
        alistNumbersInWords.add("Five");
    
        /*
         * To copy one ArrayList to another, use
         * static void copy(List destinationList, List sourceList)
         * method of Collections class.
         *
         * copy method copies all elements of one ArrayList to another one and
         * thus overwriting any value which is already present in the destination
         * List.
         *
         */
       
        //all elements of ArrayList alistNumbers will be copied to alistNumbersInWords
        Collections.copy(alistNumbersInWords, alistNumbers);
       
        System.out.println(alistNumbersInWords);
       
        /*
         * Note: Make sure that destination list is long enough to hold all
         * copied elements. If this is not the case, ArrayIndexOutOfBoundsException
         * will be thrown.
         */
    }
}
 
/*
Output of above given Java ArrayList copy example would be
[1, 2, 3, Four, Five]
*/

Sameera's blog

A small Correction, when

Submitted by Anonymous on Thu, 01/06/2011 - 17:40.

A small Correction, when destination list is not long enough to hold all copied elements it gives "java.lang.IndexOutOfBoundsException" not "java.lang.ArrayIndexOutOfBoundsException"

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