BE THE CODER > Java > Collections > NCopies of Collection

The following example shows how to use Collections.nCopies API. It returns an immutable and serializable list consisting of n copies of the specified object.

File Name :	com/bethecoder/tutorials/utils/collections/NCopies.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.utils.collections;



import java.util.Collections;

import java.util.List;





public class NCopies {



  /**

   * @param args

   */

  public static void main(String[] args) {



    //4 copies of "NCopies" as list

    List<String> strList = Collections.nCopies(4, "NCopies");

    System.out.println(strList);

    

    //6 copies of Boolean.TRUE as list

    List<Boolean> boolList = Collections.nCopies(6, Boolean.TRUE);

    System.out.println(boolList);

    

    //6 copies of 'A' as list

    List<Character> charList = Collections.nCopies(6, 'A');

    System.out.println(charList);

    

    //4 copies of '6' as list

    List<Integer> intList = Collections.nCopies(4, 6);

    System.out.println(intList);

  }

}